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Gene expression - Wikipedia

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For a non-technical introduction to the topic, see <a href="/wiki/Introduction_to_genetics" title="Introduction to genetics">Introduction to genetics</a>.</div> <style data-mw-deduplicate="TemplateStyles:r1129693374">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist dd,.mw-parser-output .hlist dt,.mw-parser-output .hlist li{margin:0;display:inline}.mw-parser-output .hlist.inline,.mw-parser-output .hlist.inline dl,.mw-parser-output .hlist.inline ol,.mw-parser-output .hlist.inline ul,.mw-parser-output .hlist dl dl,.mw-parser-output .hlist dl ol,.mw-parser-output .hlist dl ul,.mw-parser-output .hlist ol dl,.mw-parser-output .hlist ol ol,.mw-parser-output .hlist ol ul,.mw-parser-output .hlist ul dl,.mw-parser-output .hlist ul ol,.mw-parser-output .hlist ul ul{display:inline}.mw-parser-output .hlist .mw-empty-li{display:none}.mw-parser-output .hlist dt::after{content:": "}.mw-parser-output .hlist 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screen{html.skin-theme-clientpref-night .mw-parser-output .sidebar:not(.notheme) .sidebar-list-title,html.skin-theme-clientpref-night .mw-parser-output .sidebar:not(.notheme) .sidebar-title-with-pretitle{background:transparent!important}html.skin-theme-clientpref-night .mw-parser-output .sidebar:not(.notheme) .sidebar-title-with-pretitle a{color:var(--color-progressive)!important}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .sidebar:not(.notheme) .sidebar-list-title,html.skin-theme-clientpref-os .mw-parser-output .sidebar:not(.notheme) .sidebar-title-with-pretitle{background:transparent!important}html.skin-theme-clientpref-os .mw-parser-output .sidebar:not(.notheme) .sidebar-title-with-pretitle a{color:var(--color-progressive)!important}}@media print{body.ns-0 .mw-parser-output .sidebar{display:none!important}}</style><style data-mw-deduplicate="TemplateStyles:r1066933788">.mw-parser-output .excerpt-hat .mw-editsection-like{font-style:normal}</style><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1066933788"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1066933788"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1066933788"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1066933788"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1066933788"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"> <p><b>Gene expression</b> is the process by which information from a <a href="/wiki/Gene" title="Gene">gene</a> is used in the synthesis of a functional <a href="/wiki/Gene_product" title="Gene product">gene product</a> that enables it to produce end products, <a href="/wiki/Protein" title="Protein">proteins</a> or <a href="/wiki/Non-coding_RNA" title="Non-coding RNA">non-coding RNA</a>, and ultimately affect a <a href="/wiki/Phenotype" title="Phenotype">phenotype</a>. These products are often <a href="/wiki/Protein" title="Protein">proteins</a>, but in non-protein-coding genes such as <a href="/wiki/Transfer_RNA" title="Transfer RNA">transfer RNA (tRNA)</a> and <a href="/wiki/Small_nuclear_RNA" title="Small nuclear RNA">small nuclear RNA (snRNA)</a>, the product is a functional <a href="/wiki/List_of_RNAs" title="List of RNAs">non-coding RNA</a>. The process of gene expression is used by all known life—<a href="/wiki/Eukaryotes" class="mw-redirect" title="Eukaryotes">eukaryotes</a> (including <a href="/wiki/Multicellular_organisms" class="mw-redirect" title="Multicellular organisms">multicellular organisms</a>), <a href="/wiki/Prokaryotes" class="mw-redirect" title="Prokaryotes">prokaryotes</a> (<a href="/wiki/Bacteria" title="Bacteria">bacteria</a> and <a href="/wiki/Archaea" title="Archaea">archaea</a>), and utilized by <a href="/wiki/Virus" title="Virus">viruses</a>—to generate the <a href="/wiki/Macromolecule" title="Macromolecule">macromolecular</a> machinery for life. </p><p>In <a href="/wiki/Genetics" title="Genetics">genetics</a>, gene expression is the most fundamental level at which the <a href="/wiki/Genotype" title="Genotype">genotype</a> gives rise to the <a href="/wiki/Phenotype" title="Phenotype">phenotype</a>, <i>i.e.</i> observable trait. The genetic information stored in <a href="/wiki/DNA" title="DNA">DNA</a> represents the genotype, whereas the phenotype results from the "interpretation" of that information. Such phenotypes are often displayed by the synthesis of proteins that control the organism's structure and development, or that act as <a href="/wiki/Enzyme" title="Enzyme">enzymes</a> catalyzing specific metabolic pathways. </p><p>All steps in the gene expression process may be modulated (regulated), including the <a href="/wiki/Transcription_(biology)" title="Transcription (biology)">transcription</a>, <a href="/wiki/RNA_splicing" title="RNA splicing">RNA splicing</a>, <a href="/wiki/Translation_(biology)" title="Translation (biology)">translation</a>, and <a href="/wiki/Post-translational_modification" title="Post-translational modification">post-translational modification</a> of a protein. <a href="/wiki/Gene_regulation" class="mw-redirect" title="Gene regulation">Regulation of gene expression</a> gives control over the timing, location, and amount of a given gene product (protein or ncRNA) present in a cell and can have a profound effect on the cellular structure and function. Regulation of gene expression is the basis for <a href="/wiki/Cellular_differentiation" title="Cellular differentiation">cellular differentiation</a>, <a href="/wiki/Developmental_biology" title="Developmental biology">development</a>, <a href="/wiki/Morphogenesis" title="Morphogenesis">morphogenesis</a> and the versatility and <a href="/wiki/Adaptability" title="Adaptability">adaptability</a> of any <a href="/wiki/Organism" title="Organism">organism</a>. Gene regulation may therefore serve as a substrate for evolutionary change. </p> <div id="toc" class="toc" role="navigation" aria-labelledby="mw-toc-heading"><input type="checkbox" role="button" id="toctogglecheckbox" class="toctogglecheckbox" style="display:none"><div class="toctitle" lang="en" dir="ltr"><h2 id="mw-toc-heading">Contents</h2><span class="toctogglespan"><label class="toctogglelabel" for="toctogglecheckbox"></label></span></div> <ul> <li class="toclevel-1 tocsection-1"><a href="#Mechanism"><span class="tocnumber">1</span> <span class="toctext">Mechanism</span></a> <ul> <li class="toclevel-2 tocsection-2"><a href="#Transcription"><span class="tocnumber">1.1</span> <span class="toctext">Transcription</span></a></li> <li class="toclevel-2 tocsection-3"><a href="#mRNA_processing"><span class="tocnumber">1.2</span> <span class="toctext">mRNA processing</span></a></li> <li class="toclevel-2 tocsection-4"><a href="#Non-coding_RNA_maturation"><span class="tocnumber">1.3</span> <span class="toctext">Non-coding RNA maturation</span></a></li> <li class="toclevel-2 tocsection-5"><a href="#RNA_export"><span class="tocnumber">1.4</span> <span class="toctext">RNA export</span></a></li> <li class="toclevel-2 tocsection-6"><a href="#Translation"><span class="tocnumber">1.5</span> <span class="toctext">Translation</span></a></li> <li class="toclevel-2 tocsection-7"><a href="#Folding"><span class="tocnumber">1.6</span> <span class="toctext">Folding</span></a></li> <li class="toclevel-2 tocsection-8"><a href="#Translocation"><span class="tocnumber">1.7</span> <span class="toctext">Translocation</span></a></li> <li class="toclevel-2 tocsection-9"><a href="#Protein_transport"><span class="tocnumber">1.8</span> <span class="toctext">Protein transport</span></a></li> <li class="toclevel-2 tocsection-10"><a href="#Protein_Degradation"><span class="tocnumber">1.9</span> <span class="toctext">Protein Degradation</span></a></li> </ul> </li> <li class="toclevel-1 tocsection-11"><a href="#Regulation_of_gene_expression"><span class="tocnumber">2</span> <span class="toctext">Regulation of gene expression</span></a> <ul> <li class="toclevel-2 tocsection-12"><a href="#Transcriptional_regulation"><span class="tocnumber">2.1</span> <span class="toctext">Transcriptional regulation</span></a> <ul> <li class="toclevel-3 tocsection-13"><a href="#Enhancers,_transcription_factors,_mediator_complex_and_DNA_loops_in_mammalian_transcription"><span class="tocnumber">2.1.1</span> <span class="toctext">Enhancers, transcription factors, mediator complex and DNA loops in mammalian transcription</span></a></li> </ul> </li> <li class="toclevel-2 tocsection-14"><a href="#DNA_methylation_and_demethylation_in_transcriptional_regulation"><span class="tocnumber">2.2</span> <span class="toctext">DNA methylation and demethylation in transcriptional regulation</span></a></li> <li class="toclevel-2 tocsection-15"><a href="#Transcriptional_regulation_in_learning_and_memory"><span class="tocnumber">2.3</span> <span class="toctext">Transcriptional regulation in learning and memory</span></a></li> <li class="toclevel-2 tocsection-16"><a href="#Transcriptional_regulation_in_cancer"><span class="tocnumber">2.4</span> <span class="toctext">Transcriptional regulation in cancer</span></a></li> <li class="toclevel-2 tocsection-17"><a href="#Post-transcriptional_regulation"><span class="tocnumber">2.5</span> <span class="toctext">Post-transcriptional regulation</span></a></li> <li class="toclevel-2 tocsection-18"><a href="#Three_prime_untranslated_regions_and_microRNAs"><span class="tocnumber">2.6</span> <span class="toctext">Three prime untranslated regions and microRNAs</span></a></li> <li class="toclevel-2 tocsection-19"><a href="#Translational_regulation"><span class="tocnumber">2.7</span> <span class="toctext">Translational regulation</span></a></li> <li class="toclevel-2 tocsection-20"><a href="#Post-translational_modifications"><span class="tocnumber">2.8</span> <span class="toctext">Post-translational modifications</span></a></li> </ul> </li> <li class="toclevel-1 tocsection-21"><a href="#Measurement"><span class="tocnumber">3</span> <span class="toctext">Measurement</span></a> <ul> <li class="toclevel-2 tocsection-22"><a href="#mRNA_quantification"><span class="tocnumber">3.1</span> <span class="toctext">mRNA quantification</span></a></li> <li class="toclevel-2 tocsection-23"><a href="#RNA_profiles_in_Wikipedia"><span class="tocnumber">3.2</span> <span class="toctext">RNA profiles in Wikipedia</span></a></li> <li class="toclevel-2 tocsection-24"><a href="#Protein_quantification"><span class="tocnumber">3.3</span> <span class="toctext">Protein quantification</span></a></li> <li class="toclevel-2 tocsection-25"><a href="#mRNA-protein_correlation"><span class="tocnumber">3.4</span> <span class="toctext">mRNA-protein correlation</span></a></li> <li class="toclevel-2 tocsection-26"><a href="#Localization"><span class="tocnumber">3.5</span> <span class="toctext">Localization</span></a></li> </ul> </li> <li class="toclevel-1 tocsection-27"><a href="#Expression_system"><span class="tocnumber">4</span> <span class="toctext">Expression system</span></a> <ul> <li class="toclevel-2 tocsection-28"><a href="#Inducible_expression"><span class="tocnumber">4.1</span> <span class="toctext">Inducible expression</span></a></li> <li class="toclevel-2 tocsection-29"><a href="#In_nature"><span class="tocnumber">4.2</span> <span class="toctext">In nature</span></a></li> </ul> </li> <li class="toclevel-1 tocsection-30"><a href="#Gene_networks"><span class="tocnumber">5</span> <span class="toctext">Gene networks</span></a></li> <li class="toclevel-1 tocsection-31"><a href="#Techniques_and_tools"><span class="tocnumber">6</span> <span class="toctext">Techniques and tools</span></a></li> <li class="toclevel-1 tocsection-32"><a href="#Gene_expression_databases"><span class="tocnumber">7</span> <span class="toctext">Gene expression databases</span></a></li> <li class="toclevel-1 tocsection-33"><a href="#See_also"><span class="tocnumber">8</span> <span class="toctext">See also</span></a></li> <li class="toclevel-1 tocsection-34"><a href="#References"><span class="tocnumber">9</span> <span class="toctext">References</span></a></li> <li class="toclevel-1 tocsection-35"><a href="#External_links"><span class="tocnumber">10</span> <span class="toctext">External links</span></a></li> </ul> </div> </section><div class="mw-heading mw-heading2 section-heading" onclick="mfTempOpenSection(1)"><span class="indicator mf-icon mf-icon-expand mf-icon--small"></span><h2 id="Mechanism">Mechanism</h2><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Gene_expression&amp;action=edit&amp;section=1" title="Edit section: Mechanism" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div><section class="mf-section-1 collapsible-block" id="mf-section-1"> <div class="mw-heading mw-heading3"><h3 id="Transcription">Transcription</h3><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Gene_expression&amp;action=edit&amp;section=2" title="Edit section: Transcription" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Simple_transcription_elongation1.svg" class="mw-file-description"><noscript><img alt="RNA polymerase moving along a stretch of DNA, leaving behind newly synthetized strand of RNA." src="//upload.wikimedia.org/wikipedia/commons/thumb/2/21/Simple_transcription_elongation1.svg/400px-Simple_transcription_elongation1.svg.png" decoding="async" width="400" height="72" class="mw-file-element" data-file-width="721" data-file-height="129"></noscript><span class="lazy-image-placeholder" style="width: 400px;height: 72px;" data-mw-src="//upload.wikimedia.org/wikipedia/commons/thumb/2/21/Simple_transcription_elongation1.svg/400px-Simple_transcription_elongation1.svg.png" data-alt="RNA polymerase moving along a stretch of DNA, leaving behind newly synthetized strand of RNA." data-width="400" data-height="72" data-srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/21/Simple_transcription_elongation1.svg/600px-Simple_transcription_elongation1.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/2/21/Simple_transcription_elongation1.svg/800px-Simple_transcription_elongation1.svg.png 2x" data-class="mw-file-element">&nbsp;</span></a><figcaption>The process of transcription is carried out by RNA polymerase (RNAP), which uses DNA (black) as a template and produces RNA (blue).</figcaption></figure> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Transcription_(biology)" title="Transcription (biology)">Transcription (biology)</a></div> <p>The production of a RNA copy from a DNA strand is called <a href="/wiki/Transcription_(biology)" title="Transcription (biology)">transcription</a>, and is performed by <a href="/wiki/RNA_polymerase" title="RNA polymerase">RNA polymerases</a>, which add one <a href="/wiki/Ribonucleotide" title="Ribonucleotide">ribonucleotide</a> at a time to a growing RNA strand as per the <a href="/wiki/Complementarity_(molecular_biology)" title="Complementarity (molecular biology)">complementarity</a> law of the nucleotide bases. This RNA is <a href="/wiki/Complementarity_(molecular_biology)" title="Complementarity (molecular biology)">complementary</a> to the template 3′ → 5′ DNA strand,<sup id="cite_ref-Brueckner2009_1-0" class="reference"><a href="#cite_note-Brueckner2009-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> with the exception that <a href="/wiki/Thymine" title="Thymine">thymines</a> (T) are replaced with <a href="/wiki/Uracil" title="Uracil">uracils</a> (U) in the RNA and possible errors. </p><p><a href="/wiki/Bacterial_transcription" title="Bacterial transcription">In bacteria, transcription</a> is carried out by a single type of RNA polymerase, which needs to bind a DNA sequence called a <a href="/wiki/Pribnow_box" title="Pribnow box">Pribnow box</a> with the help of the <a href="/wiki/Sigma_factor" title="Sigma factor">sigma factor</a> protein (σ factor) to start transcription. In eukaryotes, transcription is performed in the nucleus by three types of RNA polymerases, each of which needs a special DNA sequence called the <a href="/wiki/Promoter_(biology)" class="mw-redirect" title="Promoter (biology)">promoter</a> and a set of DNA-binding proteins—<a href="/wiki/Transcription_factors" class="mw-redirect" title="Transcription factors">transcription factors</a>—to initiate the process (see regulation of transcription below). <a href="/wiki/RNA_polymerase_I" title="RNA polymerase I">RNA polymerase I</a> is responsible for transcription of ribosomal RNA (rRNA) genes. <a href="/wiki/RNA_polymerase_II" title="RNA polymerase II">RNA polymerase II</a> (Pol II) transcribes all protein-coding genes but also some non-coding RNAs (<i>e.g.</i>, snRNAs, <a href="/wiki/SnoRNA" class="mw-redirect" title="SnoRNA">snoRNAs</a> or <a href="/wiki/Long_non-coding_RNA" title="Long non-coding RNA">long non-coding RNAs</a>). <a href="/wiki/RNA_polymerase_III" title="RNA polymerase III">RNA polymerase III</a> transcribes <a href="/wiki/5S_rRNA" class="mw-redirect" title="5S rRNA">5S rRNA</a>, transfer RNA (tRNA) genes, and some small non-coding RNAs (<i>e.g.</i>, <a href="/wiki/7SK_RNA" title="7SK RNA">7SK</a>). Transcription ends when the polymerase encounters a sequence called the <a href="/wiki/Terminator_(genetics)" title="Terminator (genetics)">terminator</a>. </p> <div class="mw-heading mw-heading3"><h3 id="mRNA_processing">mRNA processing</h3><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Gene_expression&amp;action=edit&amp;section=3" title="Edit section: mRNA processing" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Post-transcriptional_modification" title="Post-transcriptional modification">Post-transcriptional modification</a></div> <p>While transcription of prokaryotic protein-coding genes creates <a href="/wiki/MRNA" class="mw-redirect" title="MRNA">messenger RNA</a> (mRNA) that is ready for translation into protein, transcription of eukaryotic genes leaves a <a href="/wiki/Primary_transcript" title="Primary transcript">primary transcript</a> of RNA (pre-RNA), which first has to undergo a series of modifications to become a mature RNA. Types and steps involved in the maturation processes vary between coding and non-coding preRNAs; <i>i.e.</i> even though preRNA molecules for both mRNA and <a href="/wiki/Transfer_RNA" title="Transfer RNA">tRNA</a> undergo splicing, the steps and machinery involved are different.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> The processing of non-coding RNA is described below (non-coding RNA maturation). </p><p>The processing of pre-mRNA include 5′ <i>capping</i>, which is set of enzymatic reactions that add <a href="/wiki/7-methylguanosine" class="mw-redirect" title="7-methylguanosine">7-methylguanosine</a> (m<sup>7</sup>G) to the 5′ end of pre-mRNA and thus protect the RNA from degradation by <a href="/wiki/Exonucleases" class="mw-redirect" title="Exonucleases">exonucleases</a>.<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> The m<sup>7</sup>G cap is then bound by <a href="/wiki/Cap_binding_complex" title="Cap binding complex">cap binding complex</a> heterodimer (CBP20/CBP80), which aids in mRNA export to cytoplasm and also protect the RNA from <a href="/wiki/Messenger_RNA_decapping" title="Messenger RNA decapping">decapping</a>.<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </p><p>Another modification is 3′ <i>cleavage and polyadenylation</i>.<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> They occur if polyadenylation signal sequence (5′- AAUAAA-3′) is present in pre-mRNA, which is usually between protein-coding sequence and terminator.<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> The pre-mRNA is first cleaved and then a series of ~200 adenines (A) are added to form poly(A) tail, which protects the RNA from degradation.<sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> The poly(A) tail is bound by multiple <a href="/wiki/Poly(A)-binding_protein" title="Poly(A)-binding protein">poly(A)-binding proteins (PABPs)</a> necessary for mRNA export and translation re-initiation.<sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> In the inverse process of deadenylation, poly(A) tails are shortened by the <a href="/wiki/CCR4-Not" title="CCR4-Not">CCR4-Not</a> 3′-5′ exonuclease, which often leads to full transcript decay.<sup id="cite_ref-9" class="reference"><a href="#cite_note-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> </p> <figure class="mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Pre-mRNA.svg" class="mw-file-description"><noscript><img alt="Pre-mRNA is spliced to form of mature mRNA." src="//upload.wikimedia.org/wikipedia/commons/thumb/5/5a/Pre-mRNA.svg/404px-Pre-mRNA.svg.png" decoding="async" width="404" height="278" class="mw-file-element" data-file-width="512" data-file-height="352"></noscript><span class="lazy-image-placeholder" style="width: 404px;height: 278px;" data-mw-src="//upload.wikimedia.org/wikipedia/commons/thumb/5/5a/Pre-mRNA.svg/404px-Pre-mRNA.svg.png" data-alt="Pre-mRNA is spliced to form of mature mRNA." data-width="404" data-height="278" data-srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/5a/Pre-mRNA.svg/606px-Pre-mRNA.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/5a/Pre-mRNA.svg/808px-Pre-mRNA.svg.png 2x" data-class="mw-file-element">&nbsp;</span></a><figcaption>Illustration of exons and introns in pre-mRNA and the formation of mature mRNA by splicing. The UTRs (in green) are non-coding parts of exons at the ends of the mRNA.</figcaption></figure> <p>A very important modification of eukaryotic pre-mRNA is <i><a href="/wiki/RNA_splicing" title="RNA splicing">RNA splicing</a></i>. The majority of eukaryotic pre-mRNAs consist of alternating segments called <a href="/wiki/Exons" class="mw-redirect" title="Exons">exons</a> and <a href="/wiki/Introns" class="mw-redirect" title="Introns">introns</a>.<sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> During the process of splicing, an RNA-protein catalytical complex known as <a href="/wiki/Spliceosome" title="Spliceosome">spliceosome</a> catalyzes two <a href="/wiki/Transesterification" title="Transesterification">transesterification</a> reactions, which remove an intron and release it in form of lariat structure, and then splice neighbouring exons together.<sup id="cite_ref-11" class="reference"><a href="#cite_note-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> In certain cases, some introns or exons can be either removed or retained in mature mRNA.<sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> This so-called <a href="/wiki/Alternative_splicing" title="Alternative splicing">alternative splicing</a> creates series of different transcripts originating from a single gene. Because these transcripts can be potentially translated into different proteins, splicing extends the complexity of eukaryotic gene expression and the size of a species <a href="/wiki/Proteome" title="Proteome">proteome</a>.<sup id="cite_ref-13" class="reference"><a href="#cite_note-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup> </p><p>Extensive RNA processing may be an <a href="/wiki/Evolution" title="Evolution">evolutionary advantage</a> made possible by the nucleus of eukaryotes. In prokaryotes, transcription and translation happen together, whilst in eukaryotes, the <a href="/wiki/Nuclear_membrane" class="mw-redirect" title="Nuclear membrane">nuclear membrane</a> separates the two processes, giving time for RNA processing to occur.<sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Non-coding_RNA_maturation">Non-coding RNA maturation</h3><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Gene_expression&amp;action=edit&amp;section=4" title="Edit section: Non-coding RNA maturation" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main articles: <a href="/wiki/TRNA#tRNA_biogenesis" class="mw-redirect" title="TRNA">tRNA maturation</a>, <a href="/wiki/RRNA#Prokaryotes_vs._Eukaryotes" class="mw-redirect" title="RRNA">rRNA maturation</a>, and <a href="/wiki/MicroRNA#Biogenesis" title="MicroRNA">miRNA maturation</a></div> <p>In most organisms <a href="/wiki/NcRNA" class="mw-redirect" title="NcRNA">non-coding genes (ncRNA)</a> are transcribed as precursors that undergo further processing. In the case of ribosomal RNAs (rRNA), they are often transcribed as a pre-rRNA that contains one or more rRNAs. The pre-rRNA is cleaved and modified (<a href="/wiki/2%E2%80%B2-O-methylation" class="mw-redirect" title="2′-O-methylation">2′-<i>O</i>-methylation</a> and <a href="/wiki/Pseudouridine" title="Pseudouridine">pseudouridine</a> formation) at specific sites by approximately 150 different small nucleolus-restricted RNA species, called snoRNAs. SnoRNAs associate with proteins, forming snoRNPs. While snoRNA part basepair with the target RNA and thus position the modification at a precise site, the protein part performs the catalytical reaction. In eukaryotes, in particular a snoRNP called RNase, MRP cleaves the <a href="/wiki/45S_pre-rRNA" class="mw-redirect" title="45S pre-rRNA">45S pre-rRNA</a> into the <a href="/wiki/28S_ribosomal_RNA" title="28S ribosomal RNA">28S</a>, <a href="/wiki/5.8S_ribosomal_RNA" title="5.8S ribosomal RNA">5.8S</a>, and <a href="/wiki/18S_rRNA" class="mw-redirect" title="18S rRNA">18S rRNAs</a>. The rRNA and RNA processing factors form large aggregates called the <a href="/wiki/Nucleolus" title="Nucleolus">nucleolus</a>.<sup id="cite_ref-Sirri2008_15-0" class="reference"><a href="#cite_note-Sirri2008-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup> </p><p>In the case of transfer RNA (tRNA), for example, the 5′ sequence is removed by <a href="/wiki/RNase_P" class="mw-redirect" title="RNase P">RNase P</a>,<sup id="cite_ref-pmid9759486_16-0" class="reference"><a href="#cite_note-pmid9759486-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup> whereas the 3′ end is removed by the <a href="/wiki/Ribonuclease_Z" title="Ribonuclease Z">tRNase Z</a> enzyme<sup id="cite_ref-pmid17305600_17-0" class="reference"><a href="#cite_note-pmid17305600-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup> and the non-templated 3′ CCA tail is added by a <a href="/wiki/Nucleotidyl_transferase" class="mw-redirect" title="Nucleotidyl transferase">nucleotidyl transferase</a>.<sup id="cite_ref-pmid15498478_18-0" class="reference"><a href="#cite_note-pmid15498478-18"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup> In the case of <a href="/wiki/MiRNA" class="mw-redirect" title="MiRNA">micro RNA (miRNA)</a>, miRNAs are first transcribed as primary transcripts or pri-miRNA with a cap and poly-A tail and processed to short, 70-nucleotide stem-loop structures known as pre-miRNA in the cell nucleus by the enzymes <a href="/wiki/Drosha" title="Drosha">Drosha</a> and <a href="/wiki/Pasha_(protein)" class="mw-redirect" title="Pasha (protein)">Pasha</a>. After being exported, it is then processed to mature miRNAs in the cytoplasm by interaction with the endonuclease <a href="/wiki/Dicer" title="Dicer">Dicer</a>, which also initiates the formation of the <a href="/wiki/RNA-induced_silencing_complex" title="RNA-induced silencing complex">RNA-induced silencing complex (RISC)</a>, composed of the <a href="/wiki/Argonaute" title="Argonaute">Argonaute</a> protein. </p><p>Even snRNAs and snoRNAs themselves undergo series of modification before they become part of functional RNP complex.<sup id="cite_ref-19" class="reference"><a href="#cite_note-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup> This is done either in the nucleoplasm or in the specialized compartments called <a href="/wiki/Cajal_body" title="Cajal body">Cajal bodies</a>.<sup id="cite_ref-20" class="reference"><a href="#cite_note-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup> Their bases are methylated or pseudouridinilated by a group of <a href="/wiki/Small_Cajal_body-specific_RNA" title="Small Cajal body-specific RNA">small Cajal body-specific RNAs (scaRNAs)</a>, which are structurally similar to snoRNAs.<sup id="cite_ref-21" class="reference"><a href="#cite_note-21"><span class="cite-bracket">[</span>21<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="RNA_export">RNA export</h3><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Gene_expression&amp;action=edit&amp;section=5" title="Edit section: RNA export" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Nuclear_transport" title="Nuclear transport">Nuclear transport</a></div> <p>In eukaryotes most mature RNA must be exported to the cytoplasm from the <a href="/wiki/Cell_nucleus" title="Cell nucleus">nucleus</a>. While some RNAs function in the nucleus, many RNAs are transported through the <a href="/wiki/Nuclear_pore" class="mw-redirect" title="Nuclear pore">nuclear pores</a> and into the <a href="/wiki/Cytosol" title="Cytosol">cytosol</a>.<sup id="cite_ref-K2007_22-0" class="reference"><a href="#cite_note-K2007-22"><span class="cite-bracket">[</span>22<span class="cite-bracket">]</span></a></sup> Export of RNAs requires association with specific proteins known as exportins. Specific exportin molecules are responsible for the export of a given RNA type. mRNA transport also requires the correct association with <a href="/wiki/Exon_junction_complex" title="Exon junction complex">Exon Junction Complex</a> (EJC), which ensures that correct processing of the mRNA is completed before export. In some cases RNAs are additionally transported to a specific part of the cytoplasm, such as a <a href="/wiki/Synapse" title="Synapse">synapse</a>; they are then towed by <a href="/wiki/Motor_protein" title="Motor protein">motor proteins</a> that bind through linker proteins to specific sequences (called "zipcodes") on the RNA.<sup id="cite_ref-Jambhekar2007_23-0" class="reference"><a href="#cite_note-Jambhekar2007-23"><span class="cite-bracket">[</span>23<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Translation">Translation</h3><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Gene_expression&amp;action=edit&amp;section=6" title="Edit section: Translation" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Translation_(biology)" title="Translation (biology)">Translation (biology)</a></div> <p>For some non-coding RNA, the mature RNA is the final gene product.<sup id="cite_ref-Amaral2008_24-0" class="reference"><a href="#cite_note-Amaral2008-24"><span class="cite-bracket">[</span>24<span class="cite-bracket">]</span></a></sup> In the case of messenger RNA (mRNA) the RNA is an information carrier coding for the synthesis of one or more proteins. mRNA carrying a single protein sequence (common in eukaryotes) is <a href="/wiki/Monocistronic" class="mw-redirect" title="Monocistronic">monocistronic</a> whilst mRNA carrying multiple protein sequences (common in prokaryotes) is known as <a href="/wiki/Polycistronic" class="mw-redirect" title="Polycistronic">polycistronic</a>. </p> <figure class="mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Ribosome_mRNA_translation_en.svg" class="mw-file-description"><noscript><img alt="Ribosome translating messenger RNA to chain of amino acids (protein)." src="//upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Ribosome_mRNA_translation_en.svg/300px-Ribosome_mRNA_translation_en.svg.png" decoding="async" width="300" height="212" class="mw-file-element" data-file-width="512" data-file-height="361"></noscript><span class="lazy-image-placeholder" style="width: 300px;height: 212px;" data-mw-src="//upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Ribosome_mRNA_translation_en.svg/300px-Ribosome_mRNA_translation_en.svg.png" data-alt="Ribosome translating messenger RNA to chain of amino acids (protein)." data-width="300" data-height="212" data-srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Ribosome_mRNA_translation_en.svg/450px-Ribosome_mRNA_translation_en.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Ribosome_mRNA_translation_en.svg/600px-Ribosome_mRNA_translation_en.svg.png 2x" data-class="mw-file-element">&nbsp;</span></a><figcaption>During the translation, tRNA charged with amino acid enters the ribosome and aligns with the correct mRNA triplet. Ribosome then adds amino acid to growing protein chain.</figcaption></figure> <p>Every mRNA consists of three parts: a 5′ untranslated region (5′UTR), a protein-coding region or <a href="/wiki/Open_reading_frame" title="Open reading frame">open reading frame</a> (ORF), and a 3′ untranslated region (3′UTR). The coding region carries information for protein synthesis encoded by the <a href="/wiki/Genetic_code" title="Genetic code">genetic code</a> to form triplets. Each triplet of nucleotides of the <a href="/wiki/Coding_region" title="Coding region">coding region</a> is called a <a href="/wiki/Codon" class="mw-redirect" title="Codon">codon</a> and corresponds to a binding site complementary to an anticodon triplet in transfer RNA. Transfer RNAs with the same anticodon sequence always carry an identical type of <a href="/wiki/Amino_acid" title="Amino acid">amino acid</a>. Amino acids are then chained together by the <a href="/wiki/Ribosome" title="Ribosome">ribosome</a> according to the order of triplets in the coding region. The ribosome helps transfer RNA to bind to messenger RNA and takes the amino acid from each transfer RNA and makes a structure-less protein out of it.<sup id="cite_ref-Hansen2003_25-0" class="reference"><a href="#cite_note-Hansen2003-25"><span class="cite-bracket">[</span>25<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Berk2007_26-0" class="reference"><a href="#cite_note-Berk2007-26"><span class="cite-bracket">[</span>26<span class="cite-bracket">]</span></a></sup> Each mRNA molecule is translated into many protein molecules, on average ~2800 in mammals.<sup id="cite_ref-27" class="reference"><a href="#cite_note-27"><span class="cite-bracket">[</span>27<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Schwanhaeusser2011_28-0" class="reference"><a href="#cite_note-Schwanhaeusser2011-28"><span class="cite-bracket">[</span>28<span class="cite-bracket">]</span></a></sup> </p><p>In prokaryotes translation generally occurs at the point of transcription (co-transcriptionally), often using a messenger RNA that is still in the process of being created. In eukaryotes translation can occur in a variety of regions of the cell depending on where the protein being written is supposed to be. Major locations are the <a href="/wiki/Cytoplasm" title="Cytoplasm">cytoplasm</a> for soluble cytoplasmic proteins and the membrane of the <a href="/wiki/Endoplasmic_reticulum" title="Endoplasmic reticulum">endoplasmic reticulum</a> for proteins that are for export from the cell or insertion into a cell <a href="/wiki/Lipid_bilayer" title="Lipid bilayer">membrane</a>. Proteins that are supposed to be produced at the endoplasmic reticulum are recognised part-way through the translation process. This is governed by the <a href="/wiki/Signal_recognition_particle" title="Signal recognition particle">signal recognition particle</a>—a protein that binds to the ribosome and directs it to the endoplasmic reticulum when it finds a <a href="/wiki/Signal_peptide" title="Signal peptide">signal peptide</a> on the growing (nascent) amino acid chain.<sup id="cite_ref-Hegde2008_29-0" class="reference"><a href="#cite_note-Hegde2008-29"><span class="cite-bracket">[</span>29<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Folding">Folding</h3><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Gene_expression&amp;action=edit&amp;section=7" title="Edit section: Folding" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Protein_folding" title="Protein folding">Protein folding</a></div> <figure class="mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Protein_folding.png" class="mw-file-description"><noscript><img alt="Process of protein folding." src="//upload.wikimedia.org/wikipedia/commons/thumb/a/a9/Protein_folding.png/300px-Protein_folding.png" decoding="async" width="300" height="133" class="mw-file-element" data-file-width="994" data-file-height="440"></noscript><span class="lazy-image-placeholder" style="width: 300px;height: 133px;" data-mw-src="//upload.wikimedia.org/wikipedia/commons/thumb/a/a9/Protein_folding.png/300px-Protein_folding.png" data-alt="Process of protein folding." data-width="300" data-height="133" data-srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/a9/Protein_folding.png/450px-Protein_folding.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/a9/Protein_folding.png/600px-Protein_folding.png 2x" data-class="mw-file-element">&nbsp;</span></a><figcaption>Protein before (left) and after (right) folding</figcaption></figure> <p>Each <a href="/wiki/Protein" title="Protein">protein</a> exists as an unfolded <a href="/wiki/Polypeptide" class="mw-redirect" title="Polypeptide">polypeptide</a> or random coil when translated from a sequence of <a href="/wiki/MRNA" class="mw-redirect" title="MRNA">mRNA</a> into a linear chain of <a href="/wiki/Amino_acid" title="Amino acid">amino acids</a>. This polypeptide lacks any developed three-dimensional structure (the left hand side of the neighboring figure). The polypeptide then folds into its characteristic and functional <a href="/wiki/Protein_structure" title="Protein structure">three-dimensional structure</a> from a <a href="/wiki/Random_coil" title="Random coil">random coil</a>.<sup id="cite_ref-Alberts_30-0" class="reference"><a href="#cite_note-Alberts-30"><span class="cite-bracket">[</span>30<span class="cite-bracket">]</span></a></sup> Amino acids interact with each other to produce a well-defined three-dimensional structure, the folded protein (the right hand side of the figure) known as the <a href="/wiki/Native_state" title="Native state">native state</a>. The resulting three-dimensional structure is determined by the amino acid sequence (<a href="/wiki/Anfinsen%27s_dogma" title="Anfinsen's dogma">Anfinsen's dogma</a>).<sup id="cite_ref-Anfinsen_31-0" class="reference"><a href="#cite_note-Anfinsen-31"><span class="cite-bracket">[</span>31<span class="cite-bracket">]</span></a></sup> </p><p>The correct three-dimensional structure is essential to function, although some parts of functional proteins <a href="/wiki/Intrinsically_disordered_proteins" title="Intrinsically disordered proteins">may remain unfolded</a>.<sup id="cite_ref-32" class="reference"><a href="#cite_note-32"><span class="cite-bracket">[</span>32<span class="cite-bracket">]</span></a></sup> Failure to fold into the intended shape usually produces inactive proteins with different properties including toxic <a href="/wiki/Prion" title="Prion">prions</a>. Several <a href="/wiki/Neurodegenerative" class="mw-redirect" title="Neurodegenerative">neurodegenerative</a> and other <a href="/wiki/Disease" title="Disease">diseases</a> are believed to result from the accumulation of <i>misfolded</i> proteins.<sup id="cite_ref-Selkoe:03_33-0" class="reference"><a href="#cite_note-Selkoe:03-33"><span class="cite-bracket">[</span>33<span class="cite-bracket">]</span></a></sup> Many <a href="/wiki/Allergy" title="Allergy">allergies</a> are caused by the folding of the proteins, for the immune system does not produce antibodies for certain protein structures.<sup id="cite_ref-34" class="reference"><a href="#cite_note-34"><span class="cite-bracket">[</span>34<span class="cite-bracket">]</span></a></sup> </p><p>Enzymes called <a href="/wiki/Chaperone_(protein)" title="Chaperone (protein)">chaperones</a> assist the newly formed protein to attain (<a href="/wiki/Protein_folding" title="Protein folding">fold</a> into) the 3-dimensional structure it needs to function.<sup id="cite_ref-Hebert2007_35-0" class="reference"><a href="#cite_note-Hebert2007-35"><span class="cite-bracket">[</span>35<span class="cite-bracket">]</span></a></sup> Similarly, RNA chaperones help RNAs attain their functional shapes.<sup id="cite_ref-Russell2008_36-0" class="reference"><a href="#cite_note-Russell2008-36"><span class="cite-bracket">[</span>36<span class="cite-bracket">]</span></a></sup> Assisting protein folding is one of the main roles of the endoplasmic reticulum in eukaryotes. </p> <div class="mw-heading mw-heading3"><h3 id="Translocation">Translocation</h3><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Gene_expression&amp;action=edit&amp;section=8" title="Edit section: Translocation" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div> <p>Secretory proteins of eukaryotes or prokaryotes must be translocated to enter the secretory pathway. Newly synthesized proteins are directed to the eukaryotic Sec61 or prokaryotic SecYEG translocation channel by <a href="/wiki/Signal_peptide" title="Signal peptide">signal peptides</a>. The efficiency of protein secretion in eukaryotes is very dependent on the <a href="/wiki/Signal_peptide" title="Signal peptide">signal peptide</a> which has been used.<sup id="cite_ref-pmid23124363_37-0" class="reference"><a href="#cite_note-pmid23124363-37"><span class="cite-bracket">[</span>37<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Protein_transport">Protein transport</h3><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Gene_expression&amp;action=edit&amp;section=9" title="Edit section: Protein transport" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div> <p>Many proteins are destined for other parts of the cell than the cytosol and a wide range of signalling sequences or <a href="/wiki/Signal_peptide" title="Signal peptide">(signal peptides)</a> are used to direct proteins to where they are supposed to be.<sup id="cite_ref-38" class="reference"><a href="#cite_note-38"><span class="cite-bracket">[</span>38<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-39" class="reference"><a href="#cite_note-39"><span class="cite-bracket">[</span>39<span class="cite-bracket">]</span></a></sup> In prokaryotes this is normally a simple process due to limited compartmentalisation of the cell.<sup id="cite_ref-40" class="reference"><a href="#cite_note-40"><span class="cite-bracket">[</span>40<span class="cite-bracket">]</span></a></sup> However, in eukaryotes there is a great variety of different targeting processes to ensure the protein arrives at the correct organelle.<sup id="cite_ref-:0_41-0" class="reference"><a href="#cite_note-:0-41"><span class="cite-bracket">[</span>41<span class="cite-bracket">]</span></a></sup> </p><p>Not all proteins remain within the cell and many are exported, for example, <a href="/wiki/Digestive_enzymes" class="mw-redirect" title="Digestive enzymes">digestive enzymes</a>, <a href="/wiki/Hormone" title="Hormone">hormones</a> and <a href="/wiki/Extracellular_matrix" title="Extracellular matrix">extracellular matrix</a> proteins. In eukaryotes the export pathway is well developed and the main mechanism for the export of these proteins is translocation to the endoplasmic reticulum, followed by transport via the <a href="/wiki/Golgi_apparatus" title="Golgi apparatus">Golgi apparatus</a>.<sup id="cite_ref-Moreau2007_42-0" class="reference"><a href="#cite_note-Moreau2007-42"><span class="cite-bracket">[</span>42<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Prudovsky2008_43-0" class="reference"><a href="#cite_note-Prudovsky2008-43"><span class="cite-bracket">[</span>43<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Protein_Degradation">Protein Degradation</h3><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Gene_expression&amp;action=edit&amp;section=10" title="Edit section: Protein Degradation" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div> <p>Protein degradation is a major regulatory mechanism of gene expression<sup id="cite_ref-44" class="reference"><a href="#cite_note-44"><span class="cite-bracket">[</span>44<span class="cite-bracket">]</span></a></sup> and contributes substantially to shaping mammalian proteomes<sup id="cite_ref-:1_45-0" class="reference"><a href="#cite_note-:1-45"><span class="cite-bracket">[</span>45<span class="cite-bracket">]</span></a></sup>. Protein degradation is a highly regulated processes, which results in significant and context dependent variation in degradation rates between proteins as well as for the same protein across cell types and tissue types. This variation can contribute about 40 % of the variance of protein levels across slowly growing tissues, with the remaining 60 % likely coming from protein synthesis, including transcription and translation as explained above<sup id="cite_ref-:1_45-1" class="reference"><a href="#cite_note-:1-45"><span class="cite-bracket">[</span>45<span class="cite-bracket">]</span></a></sup>. </p> </section><div class="mw-heading mw-heading2 section-heading" onclick="mfTempOpenSection(2)"><span class="indicator mf-icon mf-icon-expand mf-icon--small"></span><h2 id="Regulation_of_gene_expression">Regulation of gene expression</h2><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Gene_expression&amp;action=edit&amp;section=11" title="Edit section: Regulation of gene expression" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div><section class="mf-section-2 collapsible-block" id="mf-section-2"> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Regulation_of_gene_expression" title="Regulation of gene expression">Regulation of gene expression</a></div> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Tortie-flame.jpg" class="mw-file-description"><noscript><img alt="A cat with patches of orange and black fur." src="//upload.wikimedia.org/wikipedia/commons/thumb/3/32/Tortie-flame.jpg/220px-Tortie-flame.jpg" decoding="async" width="220" height="187" class="mw-file-element" data-file-width="383" data-file-height="326"></noscript><span class="lazy-image-placeholder" style="width: 220px;height: 187px;" data-mw-src="//upload.wikimedia.org/wikipedia/commons/thumb/3/32/Tortie-flame.jpg/220px-Tortie-flame.jpg" data-alt="A cat with patches of orange and black fur." data-width="220" data-height="187" data-srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/32/Tortie-flame.jpg/330px-Tortie-flame.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/3/32/Tortie-flame.jpg 2x" data-class="mw-file-element">&nbsp;</span></a><figcaption>The patchy colours of a <a href="/wiki/Tortoiseshell_cat" title="Tortoiseshell cat">tortoiseshell cat</a> are the result of different levels of expression of <a href="/wiki/Biological_pigment" title="Biological pigment">pigmentation</a> genes in different areas of the <a href="/wiki/Skin" title="Skin">skin</a>.</figcaption></figure> <p>Regulation of gene expression is the control of the amount and timing of appearance of the functional product of a gene. Control of expression is vital to allow a cell to produce the gene products it needs when it needs them; in turn, this gives cells the flexibility to adapt to a variable environment, external signals, damage to the cell, and other stimuli. More generally, gene regulation gives the cell control over all structure and function, and is the basis for <a href="/wiki/Cellular_differentiation" title="Cellular differentiation">cellular differentiation</a>, <a href="/wiki/Morphogenesis" title="Morphogenesis">morphogenesis</a> and the versatility and adaptability of any organism. </p><p>Numerous terms are used to describe types of genes depending on how they are regulated; these include: </p> <ul><li>A <b>constitutive gene</b> is a gene that is transcribed continually as opposed to a facultative gene, which is only transcribed when needed.</li> <li>A <i><a href="/wiki/Housekeeping_gene" title="Housekeeping gene">housekeeping gene</a></i> is a gene that is required to maintain basic cellular function and so is typically expressed in all cell types of an organism. Examples include <a href="/wiki/Actin" title="Actin">actin</a>, <a href="/wiki/GAPDH" class="mw-redirect" title="GAPDH">GAPDH</a> and <a href="/wiki/Ubiquitin" title="Ubiquitin">ubiquitin</a>. Some housekeeping genes are transcribed at a relatively constant rate and these genes can be used as a reference point in experiments to measure the expression rates of other genes.</li> <li>A <b>facultative gene</b> is a gene only transcribed when needed as opposed to a constitutive gene.</li> <li>An <b>inducible gene</b> is a gene whose expression is either responsive to environmental change or dependent on the position in the cell cycle.</li></ul> <p>Any step of gene expression may be modulated, from the DNA-RNA transcription step to <a href="/wiki/Post-translational_modification" title="Post-translational modification">post-translational modification</a> of a protein. The stability of the final gene product, whether it is RNA or protein, also contributes to the expression level of the gene—an unstable product results in a low expression level. In general gene expression is regulated through changes<sup id="cite_ref-pmid15277516_46-0" class="reference"><a href="#cite_note-pmid15277516-46"><span class="cite-bracket">[</span>46<span class="cite-bracket">]</span></a></sup> in the number and type of interactions between molecules<sup id="cite_ref-pmid19154003_47-0" class="reference"><a href="#cite_note-pmid19154003-47"><span class="cite-bracket">[</span>47<span class="cite-bracket">]</span></a></sup> that collectively influence transcription of DNA<sup id="cite_ref-pmid19274664_48-0" class="reference"><a href="#cite_note-pmid19274664-48"><span class="cite-bracket">[</span>48<span class="cite-bracket">]</span></a></sup> and translation of RNA.<sup id="cite_ref-pmid18348251_49-0" class="reference"><a href="#cite_note-pmid18348251-49"><span class="cite-bracket">[</span>49<span class="cite-bracket">]</span></a></sup> </p><p>Some simple examples of where gene expression is important are: </p> <ul><li>Control of <a href="/wiki/Insulin" title="Insulin">insulin</a> expression so it gives a signal for <a href="/wiki/Blood_glucose_regulation" class="mw-redirect" title="Blood glucose regulation">blood glucose regulation</a>.</li> <li><a href="/wiki/X-inactivation" title="X-inactivation">X chromosome inactivation</a> in female <a href="/wiki/Mammals" class="mw-redirect" title="Mammals">mammals</a> to prevent an "overdose" of the genes it contains.</li> <li><a href="/wiki/Cyclin" title="Cyclin">Cyclin</a> expression levels control progression through the eukaryotic <a href="/wiki/Cell_cycle" title="Cell cycle">cell cycle</a>.</li></ul> <div class="mw-heading mw-heading3"><h3 id="Transcriptional_regulation">Transcriptional regulation</h3><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Gene_expression&amp;action=edit&amp;section=12" title="Edit section: Transcriptional regulation" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Transcriptional_regulation" title="Transcriptional regulation">Transcriptional regulation</a></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Regulation_of_Lactose_Metabolism_in_Prokaryotes.svg" class="mw-file-description"><noscript><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d4/Regulation_of_Lactose_Metabolism_in_Prokaryotes.svg/220px-Regulation_of_Lactose_Metabolism_in_Prokaryotes.svg.png" decoding="async" width="220" height="165" class="mw-file-element" data-file-width="512" data-file-height="384"></noscript><span class="lazy-image-placeholder" style="width: 220px;height: 165px;" data-mw-src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d4/Regulation_of_Lactose_Metabolism_in_Prokaryotes.svg/220px-Regulation_of_Lactose_Metabolism_in_Prokaryotes.svg.png" data-width="220" data-height="165" data-srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d4/Regulation_of_Lactose_Metabolism_in_Prokaryotes.svg/330px-Regulation_of_Lactose_Metabolism_in_Prokaryotes.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d4/Regulation_of_Lactose_Metabolism_in_Prokaryotes.svg/440px-Regulation_of_Lactose_Metabolism_in_Prokaryotes.svg.png 2x" data-class="mw-file-element">&nbsp;</span></a><figcaption>When lactose is present in a prokaryote, it acts as an inducer and inactivates the repressor so that the genes for lactose metabolism can be transcribed.</figcaption></figure> <p><a href="/wiki/Transcriptional_regulation" title="Transcriptional regulation">Regulation of transcription</a> can be broken down into three main routes of influence; genetic (direct interaction of a control factor with the gene), modulation interaction of a control factor with the transcription machinery and epigenetic (non-sequence changes in DNA structure that influence transcription).<sup id="cite_ref-50" class="reference"><a href="#cite_note-50"><span class="cite-bracket">[</span>50<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-51" class="reference"><a href="#cite_note-51"><span class="cite-bracket">[</span>51<span class="cite-bracket">]</span></a></sup> </p> <figure class="mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Lambda_repressor_1LMB.png" class="mw-file-description"><noscript><img alt="Ribbon diagram of the lambda repressor dimer bound to DNA." src="//upload.wikimedia.org/wikipedia/commons/thumb/8/8f/Lambda_repressor_1LMB.png/185px-Lambda_repressor_1LMB.png" decoding="async" width="185" height="272" class="mw-file-element" data-file-width="1068" data-file-height="1569"></noscript><span class="lazy-image-placeholder" style="width: 185px;height: 272px;" data-mw-src="//upload.wikimedia.org/wikipedia/commons/thumb/8/8f/Lambda_repressor_1LMB.png/185px-Lambda_repressor_1LMB.png" data-alt="Ribbon diagram of the lambda repressor dimer bound to DNA." data-width="185" data-height="272" data-srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/8f/Lambda_repressor_1LMB.png/278px-Lambda_repressor_1LMB.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/8f/Lambda_repressor_1LMB.png/370px-Lambda_repressor_1LMB.png 2x" data-class="mw-file-element">&nbsp;</span></a><figcaption>The <a href="/wiki/Lambda_phage#Repressor" title="Lambda phage">lambda repressor</a> transcription factor (green) binds as a dimer to <a href="/wiki/Nucleic_acid_double_helix" title="Nucleic acid double helix">major groove</a> of DNA target (red and blue) and disables initiation of transcription. From <span class="plainlinks"><a href="/wiki/Protein_Data_Bank" title="Protein Data Bank">PDB</a>: <a rel="nofollow" class="external text" href="https://www.rcsb.org/structure/1LMB">1LMB</a></span>​.</figcaption></figure> <p>Direct interaction with DNA is the simplest and the most direct method by which a protein changes transcription levels.<sup id="cite_ref-52" class="reference"><a href="#cite_note-52"><span class="cite-bracket">[</span>52<span class="cite-bracket">]</span></a></sup> Genes often have several protein binding sites around the coding region with the specific function of regulating transcription.<sup id="cite_ref-53" class="reference"><a href="#cite_note-53"><span class="cite-bracket">[</span>53<span class="cite-bracket">]</span></a></sup> There are many classes of regulatory DNA binding sites known as <a href="/wiki/Enhancer_(genetics)" title="Enhancer (genetics)">enhancers</a>, <a href="/wiki/Insulator_(genetics)" title="Insulator (genetics)">insulators</a> and <a href="/wiki/Silencer_(genetics)" title="Silencer (genetics)">silencers</a>.<sup id="cite_ref-54" class="reference"><a href="#cite_note-54"><span class="cite-bracket">[</span>54<span class="cite-bracket">]</span></a></sup> The mechanisms for regulating transcription are varied, from blocking key binding sites on the DNA for <a href="/wiki/RNA_polymerase" title="RNA polymerase">RNA polymerase</a> to acting as an <a href="/wiki/Activator_(genetics)" title="Activator (genetics)">activator</a> and promoting transcription by assisting RNA polymerase binding.<sup id="cite_ref-55" class="reference"><a href="#cite_note-55"><span class="cite-bracket">[</span>55<span class="cite-bracket">]</span></a></sup> </p><p>The activity of transcription factors is further modulated by intracellular signals causing protein post-translational modification including <a href="/wiki/Phosphorylation" title="Phosphorylation">phosphorylation</a>, <a href="/wiki/Acetylation" title="Acetylation">acetylation</a>, or <a href="/wiki/Glycosylation" title="Glycosylation">glycosylation</a>.<sup id="cite_ref-56" class="reference"><a href="#cite_note-56"><span class="cite-bracket">[</span>56<span class="cite-bracket">]</span></a></sup> These changes influence a transcription factor's ability to bind, directly or indirectly, to promoter DNA, to recruit RNA polymerase, or to favor elongation of a newly synthesized RNA molecule.<sup id="cite_ref-57" class="reference"><a href="#cite_note-57"><span class="cite-bracket">[</span>57<span class="cite-bracket">]</span></a></sup> </p><p>The nuclear membrane in eukaryotes allows further regulation of transcription factors by the duration of their presence in the nucleus, which is regulated by reversible changes in their structure and by binding of other proteins.<sup id="cite_ref-pmid18937349_58-0" class="reference"><a href="#cite_note-pmid18937349-58"><span class="cite-bracket">[</span>58<span class="cite-bracket">]</span></a></sup> Environmental stimuli or endocrine signals<sup id="cite_ref-pmid19182219_59-0" class="reference"><a href="#cite_note-pmid19182219-59"><span class="cite-bracket">[</span>59<span class="cite-bracket">]</span></a></sup> may cause modification of regulatory proteins<sup id="cite_ref-pmid18937370_60-0" class="reference"><a href="#cite_note-pmid18937370-60"><span class="cite-bracket">[</span>60<span class="cite-bracket">]</span></a></sup> eliciting cascades of intracellular signals,<sup id="cite_ref-pmid19319914_61-0" class="reference"><a href="#cite_note-pmid19319914-61"><span class="cite-bracket">[</span>61<span class="cite-bracket">]</span></a></sup> which result in regulation of gene expression. </p><p>It has become apparent that there is a significant influence of non-DNA-sequence specific effects on transcription.<sup id="cite_ref-62" class="reference"><a href="#cite_note-62"><span class="cite-bracket">[</span>62<span class="cite-bracket">]</span></a></sup> These effects are referred to as <a href="/wiki/Epigenetics" title="Epigenetics">epigenetic</a> and involve the higher order structure of DNA, non-sequence specific DNA binding proteins and chemical modification of DNA.<sup id="cite_ref-63" class="reference"><a href="#cite_note-63"><span class="cite-bracket">[</span>63<span class="cite-bracket">]</span></a></sup> In general epigenetic effects alter the accessibility of DNA to proteins and so modulate transcription.<sup id="cite_ref-64" class="reference"><a href="#cite_note-64"><span class="cite-bracket">[</span>64<span class="cite-bracket">]</span></a></sup> </p> <figure class="mw-default-size mw-halign-left" typeof="mw:File/Thumb"><a href="/wiki/File:Nucleosome_1KX5_2.png" class="mw-file-description"><noscript><img alt="A cartoon representation of the nucleosome structure." src="//upload.wikimedia.org/wikipedia/commons/thumb/d/db/Nucleosome_1KX5_2.png/220px-Nucleosome_1KX5_2.png" decoding="async" width="220" height="220" class="mw-file-element" data-file-width="1024" data-file-height="1024"></noscript><span class="lazy-image-placeholder" style="width: 220px;height: 220px;" data-mw-src="//upload.wikimedia.org/wikipedia/commons/thumb/d/db/Nucleosome_1KX5_2.png/220px-Nucleosome_1KX5_2.png" data-alt="A cartoon representation of the nucleosome structure." data-width="220" data-height="220" data-srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/db/Nucleosome_1KX5_2.png/330px-Nucleosome_1KX5_2.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/db/Nucleosome_1KX5_2.png/440px-Nucleosome_1KX5_2.png 2x" data-class="mw-file-element">&nbsp;</span></a><figcaption>In eukaryotes, DNA is organized in form of <a href="/wiki/Nucleosomes" class="mw-redirect" title="Nucleosomes">nucleosomes</a>. Note how the DNA (blue and green) is tightly wrapped around the protein core made of <a href="/wiki/Histone" title="Histone">histone</a> <a href="/wiki/Octamer" class="mw-redirect" title="Octamer">octamer</a> (ribbon coils), restricting access to the DNA. From <span class="plainlinks"><a href="/wiki/Protein_Data_Bank" title="Protein Data Bank">PDB</a>: <a rel="nofollow" class="external text" href="https://www.rcsb.org/structure/1KX5">1KX5</a></span>​.</figcaption></figure> <p>In eukaryotes the structure of <a href="/wiki/Chromatin" title="Chromatin">chromatin</a>, controlled by the <a href="/wiki/Histone_code" title="Histone code">histone code</a>, regulates access to DNA with significant impacts on the expression of genes in <a href="/wiki/Euchromatin" title="Euchromatin">euchromatin</a> and <a href="/wiki/Heterochromatin" title="Heterochromatin">heterochromatin</a> areas.<sup id="cite_ref-65" class="reference"><a href="#cite_note-65"><span class="cite-bracket">[</span>65<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading4"><h4 id="Enhancers,_transcription_factors,_mediator_complex_and_DNA_loops_in_mammalian_transcription"><span id="Enhancers.2C_transcription_factors.2C_mediator_complex_and_DNA_loops_in_mammalian_transcription"></span>Enhancers, transcription factors, mediator complex and DNA loops in mammalian transcription</h4><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Gene_expression&amp;action=edit&amp;section=13" title="Edit section: Enhancers, transcription factors, mediator complex and DNA loops in mammalian transcription" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div> <figure class="mw-halign-left" typeof="mw:File/Thumb"><a href="/wiki/File:Regulation_of_transcription_in_mammals.jpg" class="mw-file-description"><noscript><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Regulation_of_transcription_in_mammals.jpg/500px-Regulation_of_transcription_in_mammals.jpg" decoding="async" width="500" height="272" class="mw-file-element" data-file-width="2524" data-file-height="1372"></noscript><span class="lazy-image-placeholder" style="width: 500px;height: 272px;" data-mw-src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Regulation_of_transcription_in_mammals.jpg/500px-Regulation_of_transcription_in_mammals.jpg" data-width="500" data-height="272" data-srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Regulation_of_transcription_in_mammals.jpg/750px-Regulation_of_transcription_in_mammals.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Regulation_of_transcription_in_mammals.jpg/1000px-Regulation_of_transcription_in_mammals.jpg 2x" data-class="mw-file-element">&nbsp;</span></a><figcaption> <b>Regulation of transcription in mammals</b>. An active <a href="/wiki/Enhancer_(genetics)" title="Enhancer (genetics)">enhancer</a> regulatory region is enabled to interact with the <a href="/wiki/Promoter_(genetics)" title="Promoter (genetics)">promoter</a> region of its target <a href="/wiki/Gene" title="Gene">gene</a> by formation of a chromosome loop. This can initiate <a href="/wiki/Messenger_RNA" title="Messenger RNA">messenger RNA</a> (mRNA) synthesis by <a href="/wiki/RNA_polymerase_II" title="RNA polymerase II">RNA polymerase II</a> (RNAP II) bound to the promoter at the <a href="/wiki/Transcription_(biology)" title="Transcription (biology)">transcription start site</a> of the gene. The loop is stabilized by one architectural protein anchored to the enhancer and one anchored to the promoter and these proteins are joined to form a dimer (red zigzags). Specific regulatory <a href="/wiki/Transcription_factor" title="Transcription factor">transcription factors</a> bind to DNA sequence motifs on the enhancer. General transcription factors bind to the promoter. When a transcription factor is activated by a signal (here indicated as <a href="/wiki/Phosphorylation" title="Phosphorylation">phosphorylation</a> shown by a small red star on a transcription factor on the enhancer) the enhancer is activated and can now activate its target promoter. The active enhancer is transcribed on each strand of DNA in opposite directions by bound RNAP IIs. Mediator proteins (a complex consisting of about 26 proteins in an interacting structure) communicate regulatory signals from the enhancer DNA-bound transcription factors to the promoter.</figcaption></figure> <p>Gene expression in mammals is regulated by many <a href="/wiki/Cis-regulatory_element" title="Cis-regulatory element">cis-regulatory elements</a>, including <a href="/wiki/Promoter_(genetics)" title="Promoter (genetics)">core promoters and promoter-proximal elements</a> that are located near the <a href="/wiki/Eukaryotic_transcription" title="Eukaryotic transcription">transcription start sites</a> of genes, <a href="/wiki/Upstream_and_downstream_(DNA)" title="Upstream and downstream (DNA)">upstream</a> on the DNA (towards the 5' region of the <a href="/wiki/Sense_strand" title="Sense strand">sense strand</a>). Other important cis-regulatory modules are localized in DNA regions that are distant from the transcription start sites. These include <a href="/wiki/Enhancer_(genetics)" title="Enhancer (genetics)">enhancers</a>, <a href="/wiki/Silencer_(genetics)" title="Silencer (genetics)">silencers</a>, <a href="/wiki/Insulator_(genetics)" title="Insulator (genetics)">insulators</a> and tethering elements.<sup id="cite_ref-pmid33102493_66-0" class="reference"><a href="#cite_note-pmid33102493-66"><span class="cite-bracket">[</span>66<span class="cite-bracket">]</span></a></sup> Enhancers and their associated <a href="/wiki/Transcription_factors" class="mw-redirect" title="Transcription factors">transcription factors</a> have a leading role in the regulation of gene expression.<sup id="cite_ref-pmid22868264_67-0" class="reference"><a href="#cite_note-pmid22868264-67"><span class="cite-bracket">[</span>67<span class="cite-bracket">]</span></a></sup> </p><p><a href="/wiki/Enhancer_(genetics)" title="Enhancer (genetics)">Enhancers</a> are genome regions that regulate genes. Enhancers control cell-type-specific gene expression programs, most often by looping through long distances to come in physical proximity with the promoters of their target genes.<sup id="cite_ref-Schoenfelder_68-0" class="reference"><a href="#cite_note-Schoenfelder-68"><span class="cite-bracket">[</span>68<span class="cite-bracket">]</span></a></sup> Multiple enhancers, each often tens or hundred of thousands of nucleotides distant from their target genes, loop to their target gene promoters and coordinate with each other to control gene expression.<sup id="cite_ref-Schoenfelder_68-1" class="reference"><a href="#cite_note-Schoenfelder-68"><span class="cite-bracket">[</span>68<span class="cite-bracket">]</span></a></sup> </p><p>The illustration shows an enhancer looping around to come into proximity with the promoter of a target gene. The loop is stabilized by a dimer of a connector protein (e.g. dimer of <a href="/wiki/CTCF" title="CTCF">CTCF</a> or <a href="/wiki/YY1" title="YY1">YY1</a>). One member of the dimer is anchored to its binding motif on the enhancer and the other member is anchored to its binding motif on the promoter (represented by the red zigzags in the illustration).<sup id="cite_ref-pmid29224777_69-0" class="reference"><a href="#cite_note-pmid29224777-69"><span class="cite-bracket">[</span>69<span class="cite-bracket">]</span></a></sup> Several cell function-specific transcription factors (among the about 1,600 transcription factors in a human cell)<sup id="cite_ref-pmid29425488_70-0" class="reference"><a href="#cite_note-pmid29425488-70"><span class="cite-bracket">[</span>70<span class="cite-bracket">]</span></a></sup> generally bind to specific motifs on an enhancer.<sup id="cite_ref-pmid29987030_71-0" class="reference"><a href="#cite_note-pmid29987030-71"><span class="cite-bracket">[</span>71<span class="cite-bracket">]</span></a></sup> A small combination of these enhancer-bound transcription factors, when brought close to a promoter by a DNA loop, govern transcription level of the target gene. Mediator (a complex usually consisting of about 26 proteins in an interacting structure) communicates regulatory signals from enhancer DNA-bound transcription factors directly to the RNA polymerase II (pol II) enzyme bound to the promoter.<sup id="cite_ref-pmid25693131_72-0" class="reference"><a href="#cite_note-pmid25693131-72"><span class="cite-bracket">[</span>72<span class="cite-bracket">]</span></a></sup> </p><p>Enhancers, when active, are generally transcribed from both strands of DNA with RNA polymerases acting in two different directions, producing two eRNAs as illustrated in the figure.<sup id="cite_ref-pmid29378788_73-0" class="reference"><a href="#cite_note-pmid29378788-73"><span class="cite-bracket">[</span>73<span class="cite-bracket">]</span></a></sup> An inactive enhancer may be bound by an inactive transcription factor. Phosphorylation of the transcription factor may activate it and that activated transcription factor may then activate the enhancer to which it is bound (see small red star representing phosphorylation of transcription factor bound to enhancer in the illustration).<sup id="cite_ref-pmid12514134_74-0" class="reference"><a href="#cite_note-pmid12514134-74"><span class="cite-bracket">[</span>74<span class="cite-bracket">]</span></a></sup> An activated enhancer begins transcription of its RNA before activating transcription of messenger RNA from its target gene.<sup id="cite_ref-pmid32810208_75-0" class="reference"><a href="#cite_note-pmid32810208-75"><span class="cite-bracket">[</span>75<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="DNA_methylation_and_demethylation_in_transcriptional_regulation">DNA methylation and demethylation in transcriptional regulation</h3><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Gene_expression&amp;action=edit&amp;section=14" title="Edit section: DNA methylation and demethylation in transcriptional regulation" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:DNA_methylation.svg" class="mw-file-description"><noscript><img src="//upload.wikimedia.org/wikipedia/commons/thumb/9/90/DNA_methylation.svg/300px-DNA_methylation.svg.png" decoding="async" width="300" height="172" class="mw-file-element" data-file-width="512" data-file-height="293"></noscript><span class="lazy-image-placeholder" style="width: 300px;height: 172px;" data-mw-src="//upload.wikimedia.org/wikipedia/commons/thumb/9/90/DNA_methylation.svg/300px-DNA_methylation.svg.png" data-width="300" data-height="172" data-srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/90/DNA_methylation.svg/450px-DNA_methylation.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/90/DNA_methylation.svg/600px-DNA_methylation.svg.png 2x" data-class="mw-file-element">&nbsp;</span></a><figcaption>DNA methylation is the addition of a <a href="/wiki/Methyl" class="mw-redirect" title="Methyl">methyl</a> group to the DNA that happens at <a href="/wiki/Cytosine" title="Cytosine">cytosine</a>. The image shows a cytosine single ring base and a methyl group added on to the 5 carbon. In mammals, DNA methylation occurs almost exclusively at a cytosine that is followed by a <a href="/wiki/Guanine" title="Guanine">guanine</a>.</figcaption></figure> <p><a href="/wiki/DNA_methylation" title="DNA methylation">DNA methylation</a> is a widespread mechanism for epigenetic influence on gene expression and is seen in <a href="/wiki/Bacteria" title="Bacteria">bacteria</a> and <a href="/wiki/Eukaryotes" class="mw-redirect" title="Eukaryotes">eukaryotes</a> and has roles in heritable transcription silencing and transcription regulation. Methylation most often occurs on a cytosine (see Figure). Methylation of cytosine primarily occurs in dinucleotide sequences where a cytosine is followed by a guanine, a <a href="/wiki/CpG_site" title="CpG site">CpG site</a>. The number of <a href="/wiki/CpG_site" title="CpG site">CpG sites</a> in the human genome is about 28 million.<sup id="cite_ref-pmid26932361_76-0" class="reference"><a href="#cite_note-pmid26932361-76"><span class="cite-bracket">[</span>76<span class="cite-bracket">]</span></a></sup> Depending on the type of cell, about 70% of the CpG sites have a methylated cytosine.<sup id="cite_ref-Jabbari2004_77-0" class="reference"><a href="#cite_note-Jabbari2004-77"><span class="cite-bracket">[</span>77<span class="cite-bracket">]</span></a></sup> </p><p>Methylation of cytosine in DNA has a major role in regulating gene expression. Methylation of CpGs in a promoter region of a gene usually represses gene transcription<sup id="cite_ref-pmid17334365_78-0" class="reference"><a href="#cite_note-pmid17334365-78"><span class="cite-bracket">[</span>78<span class="cite-bracket">]</span></a></sup> while methylation of CpGs in the body of a gene increases expression.<sup id="cite_ref-pmid25263941_79-0" class="reference"><a href="#cite_note-pmid25263941-79"><span class="cite-bracket">[</span>79<span class="cite-bracket">]</span></a></sup> <a href="/wiki/TET_enzymes" title="TET enzymes">TET enzymes</a> play a central role in demethylation of methylated cytosines. Demethylation of CpGs in a gene promoter by <a href="/wiki/TET_enzymes" title="TET enzymes">TET enzyme</a> activity increases transcription of the gene.<sup id="cite_ref-pmid24108092_80-0" class="reference"><a href="#cite_note-pmid24108092-80"><span class="cite-bracket">[</span>80<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Transcriptional_regulation_in_learning_and_memory">Transcriptional regulation in learning and memory</h3><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Gene_expression&amp;action=edit&amp;section=15" title="Edit section: Transcriptional regulation in learning and memory" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Epigenetics_in_learning_and_memory" title="Epigenetics in learning and memory">Epigenetics in learning and memory</a></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Brain_regions_involved_in_memory_formation.jpg" class="mw-file-description"><noscript><img src="//upload.wikimedia.org/wikipedia/commons/thumb/0/07/Brain_regions_involved_in_memory_formation.jpg/400px-Brain_regions_involved_in_memory_formation.jpg" decoding="async" width="400" height="230" class="mw-file-element" data-file-width="532" data-file-height="306"></noscript><span class="lazy-image-placeholder" style="width: 400px;height: 230px;" data-mw-src="//upload.wikimedia.org/wikipedia/commons/thumb/0/07/Brain_regions_involved_in_memory_formation.jpg/400px-Brain_regions_involved_in_memory_formation.jpg" data-width="400" data-height="230" data-srcset="//upload.wikimedia.org/wikipedia/commons/0/07/Brain_regions_involved_in_memory_formation.jpg 1.5x" data-class="mw-file-element">&nbsp;</span></a><figcaption>The identified areas of the human brain are involved in memory formation.</figcaption></figure> <p>In a rat, contextual <a href="/wiki/Fear_conditioning" title="Fear conditioning">fear conditioning</a> (CFC) is a painful learning experience. Just one episode of CFC can result in a life-long fearful memory.<sup id="cite_ref-KimJung_81-0" class="reference"><a href="#cite_note-KimJung-81"><span class="cite-bracket">[</span>81<span class="cite-bracket">]</span></a></sup> After an episode of CFC, cytosine methylation is altered in the promoter regions of about 9.17% of all genes in the <a href="/wiki/Hippocampus" title="Hippocampus">hippocampus</a> neuron DNA of a rat.<sup id="cite_ref-DukeSweatt_82-0" class="reference"><a href="#cite_note-DukeSweatt-82"><span class="cite-bracket">[</span>82<span class="cite-bracket">]</span></a></sup> The <a href="/wiki/Hippocampus" title="Hippocampus">hippocampus</a> is where new memories are initially stored. After CFC about 500 genes have increased transcription (often due to demethylation of CpG sites in a promoter region) and about 1,000 genes have decreased transcription (often due to newly formed 5-methylcytosine at CpG sites in a promoter region). The pattern of induced and repressed genes within neurons appears to provide a molecular basis for forming the first transient memory of this training event in the hippocampus of the rat brain.<sup id="cite_ref-DukeSweatt_82-1" class="reference"><a href="#cite_note-DukeSweatt-82"><span class="cite-bracket">[</span>82<span class="cite-bracket">]</span></a></sup> </p><p>Some specific mechanisms guiding new DNA methylations and new <a href="/wiki/DNA_demethylation" title="DNA demethylation">DNA demethylations</a> in the <a href="/wiki/Hippocampus" title="Hippocampus">hippocampus</a> during memory establishment have been established (see<sup id="cite_ref-Bernstein_83-0" class="reference"><a href="#cite_note-Bernstein-83"><span class="cite-bracket">[</span>83<span class="cite-bracket">]</span></a></sup> for summary). One mechanism includes guiding the short isoform of the <a href="/wiki/Tet_methylcytosine_dioxygenase_1" title="Tet methylcytosine dioxygenase 1">TET1</a> <a href="/wiki/DNA_demethylation" title="DNA demethylation">DNA demethylation</a> enzyme, TET1s, to about 600 locations on the genome. The guidance is performed by association of TET1s with <a href="/wiki/EGR1" title="EGR1">EGR1</a> protein, a transcription factor important in memory formation. Bringing TET1s to these locations initiates DNA demethylation at those sites, up-regulating associated genes. A second mechanism involves DNMT3A2, a splice-isoform of <a href="/wiki/DNA_methyltransferase" title="DNA methyltransferase">DNA methyltransferase</a> DNMT3A, which adds methyl groups to cytosines in DNA. This isoform is induced by synaptic activity, and its location of action appears to be determined by <a href="/wiki/Histone" title="Histone">histone</a> post-translational modifications (a <a href="/wiki/Histone_code" title="Histone code">histone code</a>). The resulting new <a href="/wiki/Messenger_RNA" title="Messenger RNA">messenger RNAs</a> are then transported by <a href="/wiki/Messenger_RNP" title="Messenger RNP">messenger RNP</a> particles (neuronal granules) to synapses of the neurons, where they can be translated into proteins affecting the activities of synapses.<sup id="cite_ref-Bernstein_83-1" class="reference"><a href="#cite_note-Bernstein-83"><span class="cite-bracket">[</span>83<span class="cite-bracket">]</span></a></sup> </p><p>In particular, the <a href="/wiki/Brain-derived_neurotrophic_factor" title="Brain-derived neurotrophic factor">brain-derived neurotrophic factor</a> gene (<i>BDNF</i>) is known as a "learning gene".<sup id="cite_ref-Keifer_84-0" class="reference"><a href="#cite_note-Keifer-84"><span class="cite-bracket">[</span>84<span class="cite-bracket">]</span></a></sup> After CFC there was upregulation of <i>BDNF</i> gene expression, related to decreased CpG methylation of certain internal promoters of the gene, and this was correlated with learning.<sup id="cite_ref-Keifer_84-1" class="reference"><a href="#cite_note-Keifer-84"><span class="cite-bracket">[</span>84<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Transcriptional_regulation_in_cancer">Transcriptional regulation in cancer</h3><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Gene_expression&amp;action=edit&amp;section=16" title="Edit section: Transcriptional regulation in cancer" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Regulation_of_transcription_in_cancer" title="Regulation of transcription in cancer">Regulation of transcription in cancer</a></div> <p>The majority of gene <a href="/wiki/Promoter_(genetics)#CpG_islands_in_promoters" title="Promoter (genetics)">promoters</a> contain a <a href="/wiki/CpG_site#CpG_islands" title="CpG site">CpG island</a> with numerous <a href="/wiki/CpG_site" title="CpG site">CpG sites</a>.<sup id="cite_ref-pmid16432200_85-0" class="reference"><a href="#cite_note-pmid16432200-85"><span class="cite-bracket">[</span>85<span class="cite-bracket">]</span></a></sup> When many of a gene's promoter CpG sites are <a href="/wiki/DNA_methylation" title="DNA methylation">methylated</a> the gene becomes silenced.<sup id="cite_ref-Bird_86-0" class="reference"><a href="#cite_note-Bird-86"><span class="cite-bracket">[</span>86<span class="cite-bracket">]</span></a></sup> Colorectal cancers typically have 3 to 6 <a href="/wiki/Somatic_evolution_in_cancer#Glossary" title="Somatic evolution in cancer">driver</a> mutations and 33 to 66 <a href="/wiki/Genetic_hitchhiking" title="Genetic hitchhiking">hitchhiker</a> or passenger mutations.<sup id="cite_ref-pmid23539594_87-0" class="reference"><a href="#cite_note-pmid23539594-87"><span class="cite-bracket">[</span>87<span class="cite-bracket">]</span></a></sup> However, transcriptional silencing may be of more importance than mutation in causing progression to cancer. For example, in colorectal cancers about 600 to 800 genes are transcriptionally silenced by CpG island methylation (see <a href="/wiki/Regulation_of_transcription_in_cancer" title="Regulation of transcription in cancer">regulation of transcription in cancer</a>). Transcriptional repression in cancer can also occur by other <a href="/wiki/Cancer_epigenetics" title="Cancer epigenetics">epigenetic</a> mechanisms, such as altered expression of <a href="/wiki/MicroRNA#DNA_repair_and_cancer" title="MicroRNA">microRNAs</a>.<sup id="cite_ref-pmid24616890_88-0" class="reference"><a href="#cite_note-pmid24616890-88"><span class="cite-bracket">[</span>88<span class="cite-bracket">]</span></a></sup> In breast cancer, transcriptional repression of <a href="/wiki/BRCA1" title="BRCA1">BRCA1</a> may occur more frequently by over-transcribed microRNA-182 than by hypermethylation of the BRCA1 promoter (see <a href="/wiki/BRCA1#Low_expression_of_BRCA1_in_breast_and_ovarian_cancers" title="BRCA1">Low expression of BRCA1 in breast and ovarian cancers</a>). </p> <div class="mw-heading mw-heading3"><h3 id="Post-transcriptional_regulation">Post-transcriptional regulation</h3><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Gene_expression&amp;action=edit&amp;section=17" title="Edit section: Post-transcriptional regulation" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Post-transcriptional_regulation" title="Post-transcriptional regulation">Post-transcriptional regulation</a></div> <p>In eukaryotes, where export of RNA is required before translation is possible, nuclear export is thought to provide additional control over gene expression. All transport in and out of the nucleus is via the <a href="/wiki/Nuclear_pore" class="mw-redirect" title="Nuclear pore">nuclear pore</a> and transport is controlled by a wide range of <a href="/wiki/Importin" title="Importin">importin</a> and <a href="/wiki/Exportin" class="mw-redirect" title="Exportin">exportin</a> proteins.<sup id="cite_ref-89" class="reference"><a href="#cite_note-89"><span class="cite-bracket">[</span>89<span class="cite-bracket">]</span></a></sup> </p><p>Expression of a gene coding for a protein is only possible if the messenger RNA carrying the code survives long enough to be translated.<sup id="cite_ref-:0_41-1" class="reference"><a href="#cite_note-:0-41"><span class="cite-bracket">[</span>41<span class="cite-bracket">]</span></a></sup> In a typical cell, an RNA molecule is only stable if specifically protected from degradation.<sup id="cite_ref-90" class="reference"><a href="#cite_note-90"><span class="cite-bracket">[</span>90<span class="cite-bracket">]</span></a></sup> RNA degradation has particular importance in regulation of expression in eukaryotic cells where mRNA has to travel significant distances before being translated.<sup id="cite_ref-91" class="reference"><a href="#cite_note-91"><span class="cite-bracket">[</span>91<span class="cite-bracket">]</span></a></sup> In eukaryotes, RNA is stabilised by certain post-transcriptional modifications, particularly the <a href="/wiki/5%E2%80%B2_cap" class="mw-redirect" title="5′ cap">5′ cap</a> and <a href="/wiki/Polyadenylation" title="Polyadenylation">poly-adenylated tail</a>.<sup id="cite_ref-92" class="reference"><a href="#cite_note-92"><span class="cite-bracket">[</span>92<span class="cite-bracket">]</span></a></sup> </p><p>Intentional degradation of mRNA is used not just as a defence mechanism from foreign RNA (normally from viruses) but also as a route of mRNA <i>destabilisation</i>.<sup id="cite_ref-93" class="reference"><a href="#cite_note-93"><span class="cite-bracket">[</span>93<span class="cite-bracket">]</span></a></sup> If an mRNA molecule has a complementary sequence to a <a href="/wiki/Small_interfering_RNA" title="Small interfering RNA">small interfering RNA</a> then it is targeted for destruction via the <a href="/wiki/RNA_interference" title="RNA interference">RNA interference</a> pathway.<sup id="cite_ref-94" class="reference"><a href="#cite_note-94"><span class="cite-bracket">[</span>94<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Three_prime_untranslated_regions_and_microRNAs">Three prime untranslated regions and microRNAs</h3><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Gene_expression&amp;action=edit&amp;section=18" title="Edit section: Three prime untranslated regions and microRNAs" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Three_prime_untranslated_region" title="Three prime untranslated region">Three prime untranslated region</a></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/MicroRNA" title="MicroRNA">MicroRNA</a></div> <p><a href="/wiki/Three_prime_untranslated_region" title="Three prime untranslated region">Three prime untranslated regions</a> (3′UTRs) of <a href="/wiki/Messenger_RNA" title="Messenger RNA">messenger RNAs</a> (mRNAs) often contain regulatory sequences that post-transcriptionally influence gene expression. Such 3′-UTRs often contain both binding sites for <a href="/wiki/MicroRNA" title="MicroRNA">microRNAs</a> (miRNAs) as well as for regulatory proteins.<sup id="cite_ref-95" class="reference"><a href="#cite_note-95"><span class="cite-bracket">[</span>95<span class="cite-bracket">]</span></a></sup> By binding to specific sites within the 3′-UTR, miRNAs can decrease gene expression of various mRNAs by either inhibiting translation or directly causing degradation of the transcript.<sup id="cite_ref-96" class="reference"><a href="#cite_note-96"><span class="cite-bracket">[</span>96<span class="cite-bracket">]</span></a></sup> The 3′-UTR also may have silencer regions that bind repressor proteins that inhibit the expression of a mRNA.<sup id="cite_ref-97" class="reference"><a href="#cite_note-97"><span class="cite-bracket">[</span>97<span class="cite-bracket">]</span></a></sup> </p><p>The 3′-UTR often contains <a href="/wiki/Three_prime_untranslated_region#MicroRNA_response_elements" title="Three prime untranslated region">microRNA response elements (MREs)</a>. MREs are sequences to which miRNAs bind. These are prevalent motifs within 3′-UTRs. Among all regulatory motifs within the 3′-UTRs (e.g. including silencer regions), MREs make up about half of the motifs.<sup id="cite_ref-98" class="reference"><a href="#cite_note-98"><span class="cite-bracket">[</span>98<span class="cite-bracket">]</span></a></sup> </p><p>As of 2014, the <a href="/wiki/MiRBase" title="MiRBase">miRBase</a> web site,<sup id="cite_ref-99" class="reference"><a href="#cite_note-99"><span class="cite-bracket">[</span>99<span class="cite-bracket">]</span></a></sup> an archive of <a href="/wiki/MicroRNA" title="MicroRNA">miRNA</a> <a href="/wiki/Sequence_(biology)" title="Sequence (biology)">sequences</a> and annotations, listed 28,645 entries in 233 biologic species. Of these, 1,881 miRNAs were in annotated human miRNA loci. miRNAs were predicted to have an average of about four hundred target <a href="/wiki/Messenger_RNA" title="Messenger RNA">mRNAs</a> (affecting expression of several hundred genes).<sup id="cite_ref-Friedman_100-0" class="reference"><a href="#cite_note-Friedman-100"><span class="cite-bracket">[</span>100<span class="cite-bracket">]</span></a></sup> Friedman et al.<sup id="cite_ref-Friedman_100-1" class="reference"><a href="#cite_note-Friedman-100"><span class="cite-bracket">[</span>100<span class="cite-bracket">]</span></a></sup> estimate that &gt;45,000 miRNA target sites within human mRNA 3′UTRs are conserved above background levels, and &gt;60% of human protein-coding genes have been under selective pressure to maintain pairing to miRNAs. </p><p>Direct experiments show that a single miRNA can reduce the stability of hundreds of unique mRNAs.<sup id="cite_ref-pmid15685193_101-0" class="reference"><a href="#cite_note-pmid15685193-101"><span class="cite-bracket">[</span>101<span class="cite-bracket">]</span></a></sup> Other experiments show that a single miRNA may repress the production of hundreds of proteins, but that this repression often is relatively mild (less than 2-fold).<sup id="cite_ref-102" class="reference"><a href="#cite_note-102"><span class="cite-bracket">[</span>102<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-103" class="reference"><a href="#cite_note-103"><span class="cite-bracket">[</span>103<span class="cite-bracket">]</span></a></sup> </p><p>The effects of miRNA dysregulation of gene expression seem to be important in cancer.<sup id="cite_ref-pmid21931505_104-0" class="reference"><a href="#cite_note-pmid21931505-104"><span class="cite-bracket">[</span>104<span class="cite-bracket">]</span></a></sup> For instance, in gastrointestinal cancers, nine miRNAs have been identified as <a href="/wiki/Epigenetics" title="Epigenetics">epigenetically</a> altered and effective in down regulating DNA repair enzymes.<sup id="cite_ref-pmid25987950_105-0" class="reference"><a href="#cite_note-pmid25987950-105"><span class="cite-bracket">[</span>105<span class="cite-bracket">]</span></a></sup> </p><p>The effects of miRNA dysregulation of gene expression also seem to be important in neuropsychiatric disorders, such as schizophrenia, bipolar disorder, major depression, Parkinson's disease, Alzheimer's disease and autism spectrum disorders.<sup id="cite_ref-pmid22539927_106-0" class="reference"><a href="#cite_note-pmid22539927-106"><span class="cite-bracket">[</span>106<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-pmid25636176_107-0" class="reference"><a href="#cite_note-pmid25636176-107"><span class="cite-bracket">[</span>107<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Translational_regulation">Translational regulation</h3><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Gene_expression&amp;action=edit&amp;section=19" title="Edit section: Translational regulation" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Neomycin_B_C.svg" class="mw-file-description"><noscript><img alt="A chemical structure of neomycin molecule." src="//upload.wikimedia.org/wikipedia/commons/thumb/4/4f/Neomycin_B_C.svg/220px-Neomycin_B_C.svg.png" decoding="async" width="220" height="160" class="mw-file-element" data-file-width="620" data-file-height="452"></noscript><span class="lazy-image-placeholder" style="width: 220px;height: 160px;" data-mw-src="//upload.wikimedia.org/wikipedia/commons/thumb/4/4f/Neomycin_B_C.svg/220px-Neomycin_B_C.svg.png" data-alt="A chemical structure of neomycin molecule." data-width="220" data-height="160" data-srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/4f/Neomycin_B_C.svg/330px-Neomycin_B_C.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/4f/Neomycin_B_C.svg/440px-Neomycin_B_C.svg.png 2x" data-class="mw-file-element">&nbsp;</span></a><figcaption><a href="/wiki/Neomycin" title="Neomycin">Neomycin</a> is an example of a small molecule that reduces expression of all protein genes inevitably leading to cell death; it thus acts as an <a href="/wiki/Antibiotic" title="Antibiotic">antibiotic</a>.</figcaption></figure> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Translation_(genetics)" class="mw-redirect" title="Translation (genetics)">Translation (genetics)</a></div> <p>Direct regulation of translation is less prevalent than control of transcription or mRNA stability but is occasionally used.<sup id="cite_ref-108" class="reference"><a href="#cite_note-108"><span class="cite-bracket">[</span>108<span class="cite-bracket">]</span></a></sup> Inhibition of protein translation is a major target for <a href="/wiki/Toxin" title="Toxin">toxins</a> and <a href="/wiki/Antibiotic" title="Antibiotic">antibiotics</a>, so they can kill a cell by overriding its normal gene expression control.<sup id="cite_ref-109" class="reference"><a href="#cite_note-109"><span class="cite-bracket">[</span>109<span class="cite-bracket">]</span></a></sup> <a href="/wiki/Protein_synthesis_inhibitor" title="Protein synthesis inhibitor">Protein synthesis inhibitors</a> include the antibiotic <a href="/wiki/Neomycin" title="Neomycin">neomycin</a> and the toxin <a href="/wiki/Ricin" title="Ricin">ricin</a>.<sup id="cite_ref-110" class="reference"><a href="#cite_note-110"><span class="cite-bracket">[</span>110<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Post-translational_modifications">Post-translational modifications</h3><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Gene_expression&amp;action=edit&amp;section=20" title="Edit section: Post-translational modifications" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Post-translational_modification" title="Post-translational modification">Post-translational modification</a></div> <p>Post-translational modifications (PTMs) are <a href="/wiki/Covalent" class="mw-redirect" title="Covalent">covalent</a> modifications to proteins. Like RNA splicing, they help to significantly diversify the proteome. These modifications are usually catalyzed by enzymes. Additionally, processes like covalent additions to amino acid side chain residues can often be reversed by other enzymes. However, some, like the <a href="/wiki/Proteolysis" title="Proteolysis">proteolytic cleavage</a> of the protein backbone, are irreversible.<sup id="cite_ref-WalshGarneau-Tsodikova2005_111-0" class="reference"><a href="#cite_note-WalshGarneau-Tsodikova2005-111"><span class="cite-bracket">[</span>111<span class="cite-bracket">]</span></a></sup> </p><p>PTMs play many important roles in the cell.<sup id="cite_ref-KhouryBaliban2011_112-0" class="reference"><a href="#cite_note-KhouryBaliban2011-112"><span class="cite-bracket">[</span>112<span class="cite-bracket">]</span></a></sup> For example, phosphorylation is primarily involved in activating and deactivating proteins and in signaling pathways.<sup id="cite_ref-MannJensen2003_113-0" class="reference"><a href="#cite_note-MannJensen2003-113"><span class="cite-bracket">[</span>113<span class="cite-bracket">]</span></a></sup> PTMs are involved in transcriptional regulation: an important function of acetylation and methylation is histone tail modification, which alters how accessible DNA is for transcription.<sup id="cite_ref-WalshGarneau-Tsodikova2005_111-1" class="reference"><a href="#cite_note-WalshGarneau-Tsodikova2005-111"><span class="cite-bracket">[</span>111<span class="cite-bracket">]</span></a></sup> They can also be seen in the immune system, where glycosylation plays a key role.<sup id="cite_ref-SeoLee2004_114-0" class="reference"><a href="#cite_note-SeoLee2004-114"><span class="cite-bracket">[</span>114<span class="cite-bracket">]</span></a></sup> One type of PTM can initiate another type of PTM, as can be seen in how <a href="/wiki/Ubiquitination" class="mw-redirect" title="Ubiquitination">ubiquitination</a> tags proteins for degradation through proteolysis.<sup id="cite_ref-WalshGarneau-Tsodikova2005_111-2" class="reference"><a href="#cite_note-WalshGarneau-Tsodikova2005-111"><span class="cite-bracket">[</span>111<span class="cite-bracket">]</span></a></sup> Proteolysis, other than being involved in breaking down proteins, is also important in activating and deactivating them, and in regulating biological processes such as DNA transcription and cell death.<sup id="cite_ref-RogersOverall2013_115-0" class="reference"><a href="#cite_note-RogersOverall2013-115"><span class="cite-bracket">[</span>115<span class="cite-bracket">]</span></a></sup> </p> </section><div class="mw-heading mw-heading2 section-heading" onclick="mfTempOpenSection(3)"><span class="indicator mf-icon mf-icon-expand mf-icon--small"></span><h2 id="Measurement">Measurement</h2><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Gene_expression&amp;action=edit&amp;section=21" title="Edit section: Measurement" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div><section class="mf-section-3 collapsible-block" id="mf-section-3"> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Human_karyotype_with_bands_and_sub-bands.png" class="mw-file-description"><noscript><img src="//upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Human_karyotype_with_bands_and_sub-bands.png/220px-Human_karyotype_with_bands_and_sub-bands.png" decoding="async" width="220" height="364" class="mw-file-element" data-file-width="9684" data-file-height="16008"></noscript><span class="lazy-image-placeholder" style="width: 220px;height: 364px;" data-mw-src="//upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Human_karyotype_with_bands_and_sub-bands.png/220px-Human_karyotype_with_bands_and_sub-bands.png" data-width="220" data-height="364" data-srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Human_karyotype_with_bands_and_sub-bands.png/330px-Human_karyotype_with_bands_and_sub-bands.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Human_karyotype_with_bands_and_sub-bands.png/440px-Human_karyotype_with_bands_and_sub-bands.png 2x" data-class="mw-file-element">&nbsp;</span></a><figcaption>Schematic <a href="/wiki/Karyotype" title="Karyotype">karyogram</a> of a <a href="/wiki/Human" title="Human">human</a>, showing an overview of the expression of the <a href="/wiki/Human_genome" title="Human genome">human genome</a> using <a href="/wiki/G_banding" title="G banding">G banding</a>, which is a method that includes <a href="/wiki/Giemsa_stain" title="Giemsa stain">Giemsa staining</a>, wherein the lighter staining regions are generally more <a href="/wiki/Transcription_(biology)" title="Transcription (biology)">transcriptionally</a> active, whereas darker regions are more inactive.<link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Further information: <a href="/wiki/Karyotype" title="Karyotype">Karyotype</a></div></figcaption></figure> <p>Measuring gene expression is an important part of many <a href="/wiki/Life_science" class="mw-redirect" title="Life science">life sciences</a>, as the ability to quantify the level at which a particular gene is expressed within a cell, tissue or organism can provide a lot of valuable information. For example, measuring gene expression can: </p> <ul><li>Identify viral infection of a cell (<a href="/wiki/Viral_protein" title="Viral protein">viral protein</a> expression).</li> <li>Determine an individual's susceptibility to <a href="/wiki/Cancer" title="Cancer">cancer</a> (<a href="/wiki/Oncogene" title="Oncogene">oncogene</a> expression).</li> <li>Find if a bacterium is resistant to <a href="/wiki/Penicillin" title="Penicillin">penicillin</a> (<a href="/wiki/Beta-lactamase" title="Beta-lactamase">beta-lactamase</a> expression).</li> <li><a href="/wiki/Gene_expression_profiling" title="Gene expression profiling">Gene expression profiling</a> evaluates a panel of genes to help understand the fundamental mechanism of a cell. This is increasingly used in cancer therapy to <a href="/wiki/Personalized_medicine" title="Personalized medicine">target specific</a> chemotherapy. (<i>See</i> <a href="/wiki/RNA-Seq" title="RNA-Seq">RNA-Seq</a> and <a href="/wiki/DNA_microarray" title="DNA microarray">DNA_microarray</a> for details.)</li></ul> <p>Similarly, the analysis of the location of protein expression is a powerful tool, and this can be done on an organismal or cellular scale. Investigation of localization is particularly important for the study of <a href="/wiki/Developmental_biology" title="Developmental biology">development</a> in multicellular organisms and as an indicator of protein function in single cells. Ideally, measurement of expression is done by detecting the final gene product (for many genes, this is the protein); however, it is often easier to detect one of the precursors, typically <a href="/wiki/MRNA" class="mw-redirect" title="MRNA">mRNA</a> and to infer gene-expression levels from these measurements. </p> <div class="mw-heading mw-heading3"><h3 id="mRNA_quantification">mRNA quantification</h3><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Gene_expression&amp;action=edit&amp;section=22" title="Edit section: mRNA quantification" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div> <p>Levels of mRNA can be quantitatively measured by <a href="/wiki/Northern_blotting" class="mw-redirect" title="Northern blotting">northern blotting</a>, which provides size and sequence information about the mRNA molecules.<sup id="cite_ref-116" class="reference"><a href="#cite_note-116"><span class="cite-bracket">[</span>116<span class="cite-bracket">]</span></a></sup> A sample of RNA is separated on an <a href="/wiki/Agarose_gel" class="mw-redirect" title="Agarose gel">agarose gel</a> and hybridized to a radioactively labeled RNA probe that is complementary to the target sequence.<sup id="cite_ref-117" class="reference"><a href="#cite_note-117"><span class="cite-bracket">[</span>117<span class="cite-bracket">]</span></a></sup> The radiolabeled RNA is then detected by an <a href="/wiki/Autoradiograph" title="Autoradiograph">autoradiograph</a>.<sup id="cite_ref-118" class="reference"><a href="#cite_note-118"><span class="cite-bracket">[</span>118<span class="cite-bracket">]</span></a></sup> Because the use of radioactive reagents makes the procedure time-consuming and potentially dangerous, alternative labeling and detection methods, such as digoxigenin and biotin chemistries, have been developed.<sup id="cite_ref-119" class="reference"><a href="#cite_note-119"><span class="cite-bracket">[</span>119<span class="cite-bracket">]</span></a></sup> Perceived disadvantages of Northern blotting are that large quantities of RNA are required and that quantification may not be completely accurate, as it involves measuring band strength in an image of a gel.<sup id="cite_ref-120" class="reference"><a href="#cite_note-120"><span class="cite-bracket">[</span>120<span class="cite-bracket">]</span></a></sup> On the other hand, the additional mRNA size information from the Northern blot allows the discrimination of alternately spliced transcripts.<sup id="cite_ref-121" class="reference"><a href="#cite_note-121"><span class="cite-bracket">[</span>121<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-122" class="reference"><a href="#cite_note-122"><span class="cite-bracket">[</span>122<span class="cite-bracket">]</span></a></sup> </p><p>Another approach for measuring mRNA abundance is RT-qPCR. In this technique, <a href="/wiki/Reverse_transcription" class="mw-redirect" title="Reverse transcription">reverse transcription</a> is followed by <a href="/wiki/Quantitative_PCR" class="mw-redirect" title="Quantitative PCR">quantitative PCR</a>. Reverse transcription first generates a DNA template from the mRNA; this single-stranded template is called <a href="/wiki/Complementary_DNA" title="Complementary DNA">cDNA</a>. The cDNA template is then amplified in the quantitative step, during which the <a href="/wiki/Fluorescence" title="Fluorescence">fluorescence</a> emitted by labeled <a href="/wiki/Hybridization_probe" title="Hybridization probe">hybridization probes</a> or <a href="/wiki/Intercalation_(biochemistry)" title="Intercalation (biochemistry)">intercalating dyes</a> changes as the <a href="/wiki/Polymerase_chain_reaction" title="Polymerase chain reaction">DNA amplification</a> process progresses.<sup id="cite_ref-123" class="reference"><a href="#cite_note-123"><span class="cite-bracket">[</span>123<span class="cite-bracket">]</span></a></sup> With a carefully constructed standard curve, qPCR can produce an absolute measurement of the number of copies of original mRNA, typically in units of copies per nanolitre of homogenized tissue or copies per cell.<sup id="cite_ref-124" class="reference"><a href="#cite_note-124"><span class="cite-bracket">[</span>124<span class="cite-bracket">]</span></a></sup> qPCR is very sensitive (detection of a single mRNA molecule is theoretically possible), but can be expensive depending on the type of reporter used; fluorescently labeled oligonucleotide probes are more expensive than non-specific intercalating fluorescent dyes.<sup id="cite_ref-125" class="reference"><a href="#cite_note-125"><span class="cite-bracket">[</span>125<span class="cite-bracket">]</span></a></sup> </p><p>For <a href="/wiki/Expression_profiling" class="mw-redirect" title="Expression profiling">expression profiling</a>, or high-throughput analysis of many genes within a sample, <a href="/wiki/Quantitative_PCR" class="mw-redirect" title="Quantitative PCR">quantitative PCR</a> may be performed for hundreds of genes simultaneously in the case of low-density arrays.<sup id="cite_ref-126" class="reference"><a href="#cite_note-126"><span class="cite-bracket">[</span>126<span class="cite-bracket">]</span></a></sup> A second approach is the <a href="/wiki/DNA_microarrays" class="mw-redirect" title="DNA microarrays">hybridization microarray</a>. A single array or "chip" may contain probes to determine transcript levels for every known gene in the genome of one or more organisms.<sup id="cite_ref-127" class="reference"><a href="#cite_note-127"><span class="cite-bracket">[</span>127<span class="cite-bracket">]</span></a></sup> Alternatively, "tag based" technologies like <a href="/wiki/Serial_analysis_of_gene_expression" title="Serial analysis of gene expression">Serial analysis of gene expression</a> (SAGE) and <a href="/wiki/RNA-Seq" title="RNA-Seq">RNA-Seq</a>, which can provide a relative measure of the cellular <a href="/wiki/Concentration" title="Concentration">concentration</a> of different mRNAs, can be used.<sup id="cite_ref-128" class="reference"><a href="#cite_note-128"><span class="cite-bracket">[</span>128<span class="cite-bracket">]</span></a></sup> An advantage of tag-based methods is the "open architecture", allowing for the exact measurement of any transcript, with a known or unknown sequence.<sup id="cite_ref-129" class="reference"><a href="#cite_note-129"><span class="cite-bracket">[</span>129<span class="cite-bracket">]</span></a></sup> Next-generation sequencing (NGS) such as <a href="/wiki/RNA-Seq" title="RNA-Seq">RNA-Seq</a> is another approach, producing vast quantities of sequence data that can be matched to a reference genome. Although NGS is comparatively time-consuming, expensive, and resource-intensive, it can identify <a href="/wiki/Single-nucleotide_polymorphisms" class="mw-redirect" title="Single-nucleotide polymorphisms">single-nucleotide polymorphisms</a>, splice-variants, and novel genes, and can also be used to profile expression in organisms for which little or no sequence information is available.<sup id="cite_ref-130" class="reference"><a href="#cite_note-130"><span class="cite-bracket">[</span>130<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="RNA_profiles_in_Wikipedia">RNA profiles in Wikipedia</h3><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Gene_expression&amp;action=edit&amp;section=23" title="Edit section: RNA profiles in Wikipedia" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div> <figure class="mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:PBB_GE_SLC2A4_206603_at_fs.png" class="mw-file-description"><noscript><img alt="An RNA Expression diagram." src="//upload.wikimedia.org/wikipedia/commons/thumb/7/7f/PBB_GE_SLC2A4_206603_at_fs.png/300px-PBB_GE_SLC2A4_206603_at_fs.png" decoding="async" width="300" height="217" class="mw-file-element" data-file-width="732" data-file-height="530"></noscript><span class="lazy-image-placeholder" style="width: 300px;height: 217px;" data-mw-src="//upload.wikimedia.org/wikipedia/commons/thumb/7/7f/PBB_GE_SLC2A4_206603_at_fs.png/300px-PBB_GE_SLC2A4_206603_at_fs.png" data-alt="An RNA Expression diagram." data-width="300" data-height="217" data-srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/7f/PBB_GE_SLC2A4_206603_at_fs.png/450px-PBB_GE_SLC2A4_206603_at_fs.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/7f/PBB_GE_SLC2A4_206603_at_fs.png/600px-PBB_GE_SLC2A4_206603_at_fs.png 2x" data-class="mw-file-element">&nbsp;</span></a><figcaption>The RNA expression profile of the GLUT4 Transporter (one of the main glucose transporters found in the human body)</figcaption></figure> <p>Profiles like these are found for almost all proteins listed in Wikipedia. They are generated by organizations such as the <a href="/wiki/Genomics_Institute_of_the_Novartis_Research_Foundation" class="mw-redirect" title="Genomics Institute of the Novartis Research Foundation">Genomics Institute of the Novartis Research Foundation</a> and the <a href="/wiki/European_Bioinformatics_Institute" title="European Bioinformatics Institute">European Bioinformatics Institute</a>. Additional information can be found by searching their databases (for an example of the GLUT4 transporter pictured here, see citation).<sup id="cite_ref-131" class="reference"><a href="#cite_note-131"><span class="cite-bracket">[</span>131<span class="cite-bracket">]</span></a></sup> These profiles indicate the level of DNA expression (and hence RNA produced) of a certain protein in a certain tissue, and are color-coded accordingly in the images located in the Protein Box on the right side of each Wikipedia page. </p> <div class="mw-heading mw-heading3"><h3 id="Protein_quantification">Protein quantification</h3><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Gene_expression&amp;action=edit&amp;section=24" title="Edit section: Protein quantification" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div> <p>For genes encoding proteins, the expression level can be directly assessed by a number of methods with some clear analogies to the techniques for mRNA quantification. </p><p>One of the most commonly used methods is to perform a <a href="/wiki/Western_blot" title="Western blot">Western blot</a> against the protein of interest.<sup id="cite_ref-132" class="reference"><a href="#cite_note-132"><span class="cite-bracket">[</span>132<span class="cite-bracket">]</span></a></sup> This gives information on the size of the protein in addition to its identity. A sample (often cellular <a href="/wiki/Lysate" class="mw-redirect" title="Lysate">lysate</a>) is separated on a <a href="/wiki/Polyacrylamide_gel" class="mw-redirect" title="Polyacrylamide gel">polyacrylamide gel</a>, transferred to a membrane and then probed with an <a href="/wiki/Antibody" title="Antibody">antibody</a> to the protein of interest. The antibody can either be conjugated to a <a href="/wiki/Fluorophore" title="Fluorophore">fluorophore</a> or to <a href="/wiki/Horseradish_peroxidase" title="Horseradish peroxidase">horseradish peroxidase</a> for imaging and/or quantification. The gel-based nature of this assay makes quantification less accurate, but it has the advantage of being able to identify later modifications to the protein, for example proteolysis or ubiquitination, from changes in size. </p> <div class="mw-heading mw-heading3"><h3 id="mRNA-protein_correlation">mRNA-protein correlation</h3><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Gene_expression&amp;action=edit&amp;section=25" title="Edit section: mRNA-protein correlation" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div> <p>While transcription directly reflects gene expression, the copy number of mRNA molecules does not directly correlate with the number of protein molecules translated from mRNA. Quantification of both protein and mRNA permits a correlation of the two levels. Regulation on each step of gene expression can impact the correlation, as shown for regulation of translation<sup id="cite_ref-Schwanhaeusser2011_28-1" class="reference"><a href="#cite_note-Schwanhaeusser2011-28"><span class="cite-bracket">[</span>28<span class="cite-bracket">]</span></a></sup> or protein stability.<sup id="cite_ref-Geiger2013_133-0" class="reference"><a href="#cite_note-Geiger2013-133"><span class="cite-bracket">[</span>133<span class="cite-bracket">]</span></a></sup> Post-translational factors, such as protein transport in highly polar cells,<sup id="cite_ref-Moritz2019_134-0" class="reference"><a href="#cite_note-Moritz2019-134"><span class="cite-bracket">[</span>134<span class="cite-bracket">]</span></a></sup> can influence the measured mRNA-protein correlation as well. </p> <div class="mw-heading mw-heading3"><h3 id="Localization">Localization</h3><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Gene_expression&amp;action=edit&amp;section=26" title="Edit section: Localization" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main articles: <a href="/wiki/In_situ_hybridization" title="In situ hybridization">In situ hybridization</a> and <a href="/wiki/Immunofluorescence" title="Immunofluorescence">Immunofluorescence</a></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Hunchback_in_situ.jpg" class="mw-file-description"><noscript><img alt="Visualization of hunchback mRNA in Drosophila embryo." src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f7/Hunchback_in_situ.jpg/220px-Hunchback_in_situ.jpg" decoding="async" width="220" height="165" class="mw-file-element" data-file-width="1889" data-file-height="1417"></noscript><span class="lazy-image-placeholder" style="width: 220px;height: 165px;" data-mw-src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f7/Hunchback_in_situ.jpg/220px-Hunchback_in_situ.jpg" data-alt="Visualization of hunchback mRNA in Drosophila embryo." data-width="220" data-height="165" data-srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f7/Hunchback_in_situ.jpg/330px-Hunchback_in_situ.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f7/Hunchback_in_situ.jpg/440px-Hunchback_in_situ.jpg 2x" data-class="mw-file-element">&nbsp;</span></a><figcaption>In situ-hybridization of <a href="/wiki/Drosophila" title="Drosophila">Drosophila</a> <a href="/wiki/Embryo" title="Embryo">embryos</a> at different developmental stages for the mRNA responsible for the expression of <a href="/wiki/Drosophila_embryogenesis#Maternal_effect_genes" title="Drosophila embryogenesis">hunchback</a>. High intensity of blue color marks places with high hunchback mRNA quantity.</figcaption></figure> <p>Analysis of expression is not limited to quantification; localization can also be determined. mRNA can be detected with a suitably labelled complementary mRNA strand and protein can be detected via labelled antibodies. The probed sample is then observed by microscopy to identify where the mRNA or protein is. </p> <figure class="mw-halign-left" typeof="mw:File/Thumb"><a href="/wiki/File:GFP_structure.png" class="mw-file-description"><noscript><img alt="A ribbon diagram of green fluorescent protein resembling barrel structure." src="//upload.wikimedia.org/wikipedia/commons/thumb/e/e4/GFP_structure.png/200px-GFP_structure.png" decoding="async" width="200" height="200" class="mw-file-element" data-file-width="1600" data-file-height="1600"></noscript><span class="lazy-image-placeholder" style="width: 200px;height: 200px;" data-mw-src="//upload.wikimedia.org/wikipedia/commons/thumb/e/e4/GFP_structure.png/200px-GFP_structure.png" data-alt="A ribbon diagram of green fluorescent protein resembling barrel structure." data-width="200" data-height="200" data-srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/e4/GFP_structure.png/300px-GFP_structure.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/e4/GFP_structure.png/400px-GFP_structure.png 2x" data-class="mw-file-element">&nbsp;</span></a><figcaption>The three-dimensional structure of <a href="/wiki/Green_fluorescent_protein" title="Green fluorescent protein">green fluorescent protein</a>. The residues in the centre of the "barrel" are responsible for production of green light after exposing to higher energetic blue light. From <span class="plainlinks"><a href="/wiki/Protein_Data_Bank" title="Protein Data Bank">PDB</a>: <a rel="nofollow" class="external text" href="https://www.rcsb.org/structure/1EMA">1EMA</a></span>​.</figcaption></figure> <p>By replacing the gene with a new version fused to a <a href="/wiki/Green_fluorescent_protein" title="Green fluorescent protein">green fluorescent protein</a> marker or similar, expression may be directly quantified in live cells. This is done by imaging using a <a href="/wiki/Fluorescence_microscope" title="Fluorescence microscope">fluorescence microscope</a>. It is very difficult to clone a GFP-fused protein into its native location in the genome without affecting expression levels, so this method often cannot be used to measure endogenous gene expression. It is, however, widely used to measure the expression of a gene artificially introduced into the cell, for example via an <a href="/wiki/Expression_vector" title="Expression vector">expression vector</a>. By fusing a target protein to a fluorescent reporter, the protein's behavior, including its cellular localization and expression level, can be significantly changed. </p><p>The <a href="/wiki/Enzyme-linked_immunosorbent_assay" class="mw-redirect" title="Enzyme-linked immunosorbent assay">enzyme-linked immunosorbent assay</a> works by using antibodies immobilised on a <a href="/wiki/Microtiter_plate" class="mw-redirect" title="Microtiter plate">microtiter plate</a> to capture proteins of interest from samples added to the well. Using a detection antibody conjugated to an enzyme or fluorophore the quantity of bound protein can be accurately measured by <a href="/wiki/Fluorometric" class="mw-redirect" title="Fluorometric">fluorometric</a> or <a href="/wiki/Colorimetry_(chemical_method)" title="Colorimetry (chemical method)">colourimetric</a> detection. The detection process is very similar to that of a Western blot, but by avoiding the gel steps more accurate quantification can be achieved. </p> </section><div class="mw-heading mw-heading2 section-heading" onclick="mfTempOpenSection(4)"><span class="indicator mf-icon mf-icon-expand mf-icon--small"></span><h2 id="Expression_system">Expression system</h2><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Gene_expression&amp;action=edit&amp;section=27" title="Edit section: Expression system" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div><section class="mf-section-4 collapsible-block" id="mf-section-4"> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Tet-ON_inducible_transgene_expression_cells.svg" class="mw-file-description"><noscript><img src="//upload.wikimedia.org/wikipedia/commons/thumb/7/7f/Tet-ON_inducible_transgene_expression_cells.svg/500px-Tet-ON_inducible_transgene_expression_cells.svg.png" decoding="async" width="500" height="386" class="mw-file-element" data-file-width="792" data-file-height="612"></noscript><span class="lazy-image-placeholder" style="width: 500px;height: 386px;" data-mw-src="//upload.wikimedia.org/wikipedia/commons/thumb/7/7f/Tet-ON_inducible_transgene_expression_cells.svg/500px-Tet-ON_inducible_transgene_expression_cells.svg.png" data-width="500" data-height="386" data-srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/7f/Tet-ON_inducible_transgene_expression_cells.svg/750px-Tet-ON_inducible_transgene_expression_cells.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/7f/Tet-ON_inducible_transgene_expression_cells.svg/1000px-Tet-ON_inducible_transgene_expression_cells.svg.png 2x" data-class="mw-file-element">&nbsp;</span></a><figcaption>Tet-ON inducible shRNA system</figcaption></figure> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Protein_production_(biotechnology)" class="mw-redirect" title="Protein production (biotechnology)">Protein production (biotechnology)</a></div> <p>An expression system is a system specifically designed for the production of a gene product of choice. This is normally a protein although may also be RNA, such as <a href="/wiki/TRNA" class="mw-redirect" title="TRNA">tRNA</a> or a <a href="/wiki/Ribozyme" title="Ribozyme">ribozyme</a>. An expression system consists of a gene, normally encoded by <a href="/wiki/DNA" title="DNA">DNA</a>, and the <a href="/wiki/Molecular_machinery" class="mw-redirect" title="Molecular machinery">molecular machinery</a> required to <a href="/wiki/Transcription_(genetics)" class="mw-redirect" title="Transcription (genetics)">transcribe</a> the DNA into <a href="/wiki/MRNA" class="mw-redirect" title="MRNA">mRNA</a> and <a href="/wiki/Translate" class="mw-redirect" title="Translate">translate</a> the mRNA into <a href="/wiki/Protein" title="Protein">protein</a> using the reagents provided. In the broadest sense this includes every living cell but the term is more normally used to refer to expression as a laboratory tool. An expression system is therefore often artificial in some manner. Expression systems are, however, a fundamentally natural process. Viruses are an excellent example where they replicate by using the host cell as an expression system for the viral proteins and genome. </p> <div class="mw-heading mw-heading3"><h3 id="Inducible_expression">Inducible expression</h3><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Gene_expression&amp;action=edit&amp;section=28" title="Edit section: Inducible expression" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div> <p><a href="/wiki/Doxycycline" title="Doxycycline">Doxycycline</a> is also used in "Tet-on" and "Tet-off" <a href="/wiki/Tetracycline_controlled_transcriptional_activation" class="mw-redirect" title="Tetracycline controlled transcriptional activation">tetracycline controlled transcriptional activation</a> to regulate <a href="/wiki/Transgene" title="Transgene">transgene</a> expression in organisms and <a href="/wiki/Cell_culture" title="Cell culture">cell cultures</a>. </p> <div class="mw-heading mw-heading3"><h3 id="In_nature">In nature</h3><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Gene_expression&amp;action=edit&amp;section=29" title="Edit section: In nature" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div> <p>In addition to these biological tools, certain naturally observed configurations of DNA (genes, promoters, enhancers, repressors) and the associated machinery itself are referred to as an expression system. This term is normally used in the case where a gene or set of genes is switched on under well defined conditions, for example, the simple repressor switch expression system in <a href="/wiki/Lambda_phage" title="Lambda phage">Lambda phage</a> and the <a href="/wiki/Lac_operator" class="mw-redirect" title="Lac operator">lac operator</a> system in bacteria. Several natural expression systems are directly used or modified and used for artificial expression systems such as the <a href="/wiki/Tetracycline_controlled_transcriptional_activation" class="mw-redirect" title="Tetracycline controlled transcriptional activation">Tet-on and Tet-off</a> expression system. </p> </section><div class="mw-heading mw-heading2 section-heading" onclick="mfTempOpenSection(5)"><span class="indicator mf-icon mf-icon-expand mf-icon--small"></span><h2 id="Gene_networks">Gene networks</h2><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Gene_expression&amp;action=edit&amp;section=30" title="Edit section: Gene networks" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div><section class="mf-section-5 collapsible-block" id="mf-section-5"> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Gene_regulatory_network" title="Gene regulatory network">Gene regulatory network</a></div> <p>Genes have sometimes been regarded as nodes in a network, with inputs being proteins such as <a href="/wiki/Transcription_factor" title="Transcription factor">transcription factors</a>, and outputs being the level of gene expression. The node itself performs a function, and the operation of these functions have been interpreted as performing a kind of information processing within cells and determines cellular behavior. </p><p>Gene networks can also be constructed without formulating an explicit causal model. This is often the case when assembling networks from large expression data sets.<sup id="cite_ref-135" class="reference"><a href="#cite_note-135"><span class="cite-bracket">[</span>135<span class="cite-bracket">]</span></a></sup> Covariation and correlation of expression is computed across a large sample of cases and measurements (often <a href="/wiki/Transcriptome" title="Transcriptome">transcriptome</a> or <a href="/wiki/Proteome" title="Proteome">proteome</a> data). The source of variation can be either experimental or natural (observational). There are several ways to construct gene expression networks, but one common approach is to compute a matrix of all pair-wise correlations of expression across conditions, time points, or individuals and convert the matrix (after thresholding at some cut-off value) into a graphical representation in which nodes represent genes, transcripts, or proteins and edges connecting these nodes represent the strength of association (see <a rel="nofollow" class="external text" href="http://www.genenetwork.org">GeneNetwork GeneNetwork 2</a>).<sup id="cite_ref-pmid_15114364_136-0" class="reference"><a href="#cite_note-pmid_15114364-136"><span class="cite-bracket">[</span>136<span class="cite-bracket">]</span></a></sup> </p> </section><div class="mw-heading mw-heading2 section-heading" onclick="mfTempOpenSection(6)"><span class="indicator mf-icon mf-icon-expand mf-icon--small"></span><h2 id="Techniques_and_tools">Techniques and tools</h2><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Gene_expression&amp;action=edit&amp;section=31" title="Edit section: Techniques and tools" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div><section class="mf-section-6 collapsible-block" id="mf-section-6"> <p>The following experimental techniques are used to measure gene expression and are listed in roughly chronological order, starting with the older, more established technologies. They are divided into two groups based on their degree of <a href="/wiki/Multiplex_(assay)" title="Multiplex (assay)">multiplexity</a>. </p> <ul><li>Low-to-mid-plex techniques: <ul><li><a href="/wiki/Reporter_gene" title="Reporter gene">Reporter gene</a></li> <li><a href="/wiki/Northern_blot" title="Northern blot">Northern blot</a></li> <li><a href="/wiki/Western_blot" title="Western blot">Western blot</a><sup id="cite_ref-Song2009_137-0" class="reference"><a href="#cite_note-Song2009-137"><span class="cite-bracket">[</span>137<span class="cite-bracket">]</span></a></sup></li> <li><a href="/wiki/Fluorescent_in_situ_hybridization" class="mw-redirect" title="Fluorescent in situ hybridization">Fluorescent in situ hybridization</a></li> <li><a href="/wiki/Reverse_transcription_polymerase_chain_reaction" title="Reverse transcription polymerase chain reaction">Reverse transcription PCR</a></li></ul></li> <li>Higher-plex techniques: <ul><li><a href="/wiki/Serial_analysis_of_gene_expression" title="Serial analysis of gene expression">SAGE</a><sup id="cite_ref-Hanriot2008_138-0" class="reference"><a href="#cite_note-Hanriot2008-138"><span class="cite-bracket">[</span>138<span class="cite-bracket">]</span></a></sup></li> <li><a href="/wiki/DNA_microarray" title="DNA microarray">DNA microarray</a><sup id="cite_ref-Wheelan2008_139-0" class="reference"><a href="#cite_note-Wheelan2008-139"><span class="cite-bracket">[</span>139<span class="cite-bracket">]</span></a></sup></li> <li><a href="/wiki/Tiling_array" title="Tiling array">Tiling array</a><sup id="cite_ref-Miyakoshi2009_140-0" class="reference"><a href="#cite_note-Miyakoshi2009-140"><span class="cite-bracket">[</span>140<span class="cite-bracket">]</span></a></sup></li> <li><a href="/wiki/RNA-Seq" title="RNA-Seq">RNA-Seq</a><sup id="cite_ref-Denoeud2008_141-0" class="reference"><a href="#cite_note-Denoeud2008-141"><span class="cite-bracket">[</span>141<span class="cite-bracket">]</span></a></sup></li></ul></li></ul> </section><div class="mw-heading mw-heading2 section-heading" onclick="mfTempOpenSection(7)"><span class="indicator mf-icon mf-icon-expand mf-icon--small"></span><h2 id="Gene_expression_databases">Gene expression databases</h2><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Gene_expression&amp;action=edit&amp;section=32" title="Edit section: Gene expression databases" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div><section class="mf-section-7 collapsible-block" id="mf-section-7"> <ul><li><a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/geo/">Gene expression omnibus</a> (GEO) at <a href="/wiki/National_Center_for_Biotechnology_Information" title="National Center for Biotechnology Information">NCBI</a><sup id="cite_ref-142" class="reference"><a href="#cite_note-142"><span class="cite-bracket">[</span>142<span class="cite-bracket">]</span></a></sup></li> <li><a rel="nofollow" class="external text" href="https://www.ebi.ac.uk/gxa/home">Expression Atlas</a> at the <a href="/wiki/European_Bioinformatics_Institute" title="European Bioinformatics Institute">EBI</a></li> <li><a rel="nofollow" class="external text" href="https://www.bgee.org/">Bgee</a> <a href="/wiki/Bgee" title="Bgee">Bgee</a> at the <a href="/wiki/SIB_Swiss_Institute_of_Bioinformatics" class="mw-redirect" title="SIB Swiss Institute of Bioinformatics">SIB Swiss Institute of Bioinformatics</a></li> <li>Mouse <a rel="nofollow" class="external text" href="http://www.informatics.jax.org/expression.shtml">Gene Expression Database</a> at the <a href="/wiki/Jackson_Laboratory" title="Jackson Laboratory">Jackson Laboratory</a></li> <li><a href="/wiki/CollecTF" title="CollecTF">CollecTF</a>: a database of experimentally validated transcription factor-binding sites in Bacteria.<sup id="cite_ref-143" class="reference"><a href="#cite_note-143"><span class="cite-bracket">[</span>143<span class="cite-bracket">]</span></a></sup></li> <li>COLOMBOS: collection of bacterial expression compendia.<sup id="cite_ref-144" class="reference"><a href="#cite_note-144"><span class="cite-bracket">[</span>144<span class="cite-bracket">]</span></a></sup></li> <li><a rel="nofollow" class="external text" href="http://m3d.mssm.edu">Many Microbe Microarrays Database</a>: microbial Affymetrix data<sup id="cite_ref-145" class="reference"><a href="#cite_note-145"><span class="cite-bracket">[</span>145<span class="cite-bracket">]</span></a></sup></li></ul> </section><div class="mw-heading mw-heading2 section-heading" onclick="mfTempOpenSection(8)"><span class="indicator mf-icon mf-icon-expand mf-icon--small"></span><h2 id="See_also">See also</h2><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Gene_expression&amp;action=edit&amp;section=33" title="Edit section: See also" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div><section class="mf-section-8 collapsible-block" id="mf-section-8"> <style data-mw-deduplicate="TemplateStyles:r1184024115">.mw-parser-output .div-col{margin-top:0.3em;column-width:30em}.mw-parser-output .div-col-small{font-size:90%}.mw-parser-output .div-col-rules{column-rule:1px solid #aaa}.mw-parser-output .div-col dl,.mw-parser-output .div-col ol,.mw-parser-output .div-col ul{margin-top:0}.mw-parser-output .div-col li,.mw-parser-output .div-col dd{page-break-inside:avoid;break-inside:avoid-column}</style><div class="div-col" style="column-width: 30em;"> <ul><li><a href="/wiki/AlloMap_molecular_expression_testing" class="mw-redirect" title="AlloMap molecular expression testing">AlloMap molecular expression testing</a></li> <li><a href="/wiki/Bookmarking" title="Bookmarking">Bookmarking</a></li> <li><a href="/wiki/EPIC-Seq" title="EPIC-Seq">EPIC-Seq</a></li> <li><a href="/wiki/Expressed_sequence_tag" title="Expressed sequence tag">Expressed sequence tag</a></li> <li><a href="/wiki/Expression_Atlas" title="Expression Atlas">Expression Atlas</a></li> <li><a href="/wiki/Expression_profiling" class="mw-redirect" title="Expression profiling">Expression profiling</a></li> <li><a href="/wiki/Gene_structure" title="Gene structure">Gene structure</a></li> <li><a href="/wiki/Genetic_engineering" title="Genetic engineering">Genetic engineering</a></li> <li><a href="/wiki/Genetically_modified_organism" title="Genetically modified organism">Genetically modified organism</a></li> <li><a href="/wiki/List_of_biological_databases" title="List of biological databases">List of biological databases</a></li> <li><a href="/wiki/List_of_human_genes" class="mw-redirect" title="List of human genes">List of human genes</a></li> <li><a href="/wiki/Oscillating_gene" title="Oscillating gene">Oscillating gene</a></li> <li><a href="/wiki/Paramutation" title="Paramutation">Paramutation</a></li> <li><a href="/wiki/Protein_production" title="Protein production">Protein production</a></li> <li><a href="/wiki/Protein_purification" title="Protein purification">Protein purification</a></li> <li><a href="/wiki/Ribonomics" title="Ribonomics">Ribonomics</a></li> <li><a href="/wiki/Ridge_(biology)" title="Ridge (biology)">Ridge</a></li> <li><a href="/wiki/Sequence_profiling_tool" title="Sequence profiling tool">Sequence profiling tool</a></li> <li><a href="/wiki/Transcriptional_bursting" title="Transcriptional bursting">Transcriptional bursting</a></li> <li><a href="/wiki/Transcriptional_noise" title="Transcriptional noise">Transcriptional noise</a></li> <li><a href="/wiki/Transcript_of_unknown_function" title="Transcript of unknown function">Transcript of unknown function</a></li></ul></div> </section><div class="mw-heading mw-heading2 section-heading" onclick="mfTempOpenSection(9)"><span class="indicator mf-icon mf-icon-expand mf-icon--small"></span><h2 id="References">References</h2><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Gene_expression&amp;action=edit&amp;section=34" title="Edit section: References" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div><section class="mf-section-9 collapsible-block" id="mf-section-9"> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap mw-references-columns"><ol class="references"> <li id="cite_note-Brueckner2009-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-Brueckner2009_1-0">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="CITEREFBruecknerArmacheCheungDamsma2009" class="citation journal cs1">Brueckner F, Armache KJ, Cheung A, Damsma GE, Kettenberger H, Lehmann E, et al. 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Vol. 530. pp. <span class="nowrap">301–</span>313. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1016%2FB978-0-12-420037-1.00016-6">10.1016/B978-0-12-420037-1.00016-6</a>. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-12-420037-1" title="Special:BookSources/978-0-12-420037-1"><bdi>978-0-12-420037-1</bdi></a>. <a href="/wiki/ISSN_(identifier)" class="mw-redirect" title="ISSN (identifier)">ISSN</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/issn/1557-7988">1557-7988</a>. <a href="/wiki/PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a> <a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/24034328">24034328</a>.</cite><span title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rft.genre=bookitem&amp;rft.atitle=Analysis+of+RNA+by+analytical+polyacrylamide+gel+electrophoresis&amp;rft.btitle=Laboratory+Methods+in+Enzymology%3A+RNA&amp;rft.pages=%3Cspan+class%3D%22nowrap%22%3E301-%3C%2Fspan%3E313&amp;rft.date=2013&amp;rft_id=info%3Adoi%2F10.1016%2FB978-0-12-420037-1.00016-6&amp;rft.issn=1557-7988&amp;rft_id=info%3Apmid%2F24034328&amp;rft.isbn=978-0-12-420037-1&amp;rft.aulast=Petrov&amp;rft.aufirst=A&amp;rft.au=Tsa%2C+A&amp;rft.au=Puglisi%2C+JD&amp;rft_id=https%3A%2F%2Fpubmed.ncbi.nlm.nih.gov%2F24034328%2F&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3AGene+expression" class="Z3988"></span></span> </li> <li id="cite_note-119"><span class="mw-cite-backlink"><b><a href="#cite_ref-119">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFBoylePerry-O'Keefe2001" class="citation journal cs1">Boyle A, Perry-O'Keefe H (May 2001). "Labeling and colorimetric detection of nonisotopic probes". <i>Current Protocols in Molecular Biology</i>. <b>3</b> (Supplement 20): Unit3.18. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1002%2F0471142727.mb0318s20">10.1002/0471142727.mb0318s20</a>. <a href="/wiki/PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a> <a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/18265226">18265226</a>.</cite><span title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&amp;rft.genre=article&amp;rft.jtitle=Current+Protocols+in+Molecular+Biology&amp;rft.atitle=Labeling+and+colorimetric+detection+of+nonisotopic+probes&amp;rft.volume=3&amp;rft.issue=Supplement+20&amp;rft.pages=Unit3.18&amp;rft.date=2001-05&amp;rft_id=info%3Adoi%2F10.1002%2F0471142727.mb0318s20&amp;rft_id=info%3Apmid%2F18265226&amp;rft.aulast=Boyle&amp;rft.aufirst=A&amp;rft.au=Perry-O%27Keefe%2C+H&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3AGene+expression" class="Z3988"></span></span> </li> <li id="cite_note-120"><span class="mw-cite-backlink"><b><a href="#cite_ref-120">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFKuangYanGendersGranata2018" class="citation journal cs1">Kuang J, Yan X, Genders AJ, Granata C, Bishop DJ (2018-05-10). <a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5944930">"An overview of technical considerations when using quantitative real-time PCR analysis of gene expression in human exercise research"</a>. <i>PLOS ONE</i>. <b>13</b> (5): e0196438. <a href="/wiki/Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/2018PLoSO..1396438K">2018PLoSO..1396438K</a>. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://doi.org/10.1371%2Fjournal.pone.0196438">10.1371/journal.pone.0196438</a></span>. <a href="/wiki/PMC_(identifier)" class="mw-redirect" title="PMC (identifier)">PMC</a> <span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5944930">5944930</a></span>. 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title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&amp;rft.genre=article&amp;rft.jtitle=PLOS+ONE&amp;rft.atitle=An+overview+of+technical+considerations+when+using+quantitative+real-time+PCR+analysis+of+gene+expression+in+human+exercise+research&amp;rft.volume=13&amp;rft.issue=5&amp;rft.pages=e0196438&amp;rft.date=2018-05-10&amp;rft_id=https%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fpmc%2Farticles%2FPMC5944930%23id-name%3DPMC&amp;rft_id=info%3Apmid%2F29746477&amp;rft_id=info%3Adoi%2F10.1371%2Fjournal.pone.0196438&amp;rft_id=info%3Abibcode%2F2018PLoSO..1396438K&amp;rft.aulast=Kuang&amp;rft.aufirst=J&amp;rft.au=Yan%2C+X&amp;rft.au=Genders%2C+AJ&amp;rft.au=Granata%2C+C&amp;rft.au=Bishop%2C+DJ&amp;rft_id=https%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fpmc%2Farticles%2FPMC5944930&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3AGene+expression" class="Z3988"></span></span> </li> <li id="cite_note-121"><span class="mw-cite-backlink"><b><a href="#cite_ref-121">^</a></b></span> <span 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class="mw-cite-backlink"><b><a href="#cite_ref-122">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFWesierska-GadekWangSchmid1999" class="citation journal cs1">Wesierska-Gadek J, Wang ZQ, Schmid G (January 1999). <a rel="nofollow" class="external text" href="https://aacrjournals.org/cancerres/article/59/1/28/505067/Reduced-Stability-of-Regularly-Spliced-but-not">"Reduced stability of regularly spliced but not alternatively spliced p53 protein in PARP-deficient mouse fibroblasts"</a>. <i>Cancer Research</i>. <b>59</b> (1): <span class="nowrap">28–</span>34. <a href="/wiki/PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a> <a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/9892179">9892179</a>.</cite><span title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&amp;rft.genre=article&amp;rft.jtitle=Cancer+Research&amp;rft.atitle=Reduced+stability+of+regularly+spliced+but+not+alternatively+spliced+p53+protein+in+PARP-deficient+mouse+fibroblasts&amp;rft.volume=59&amp;rft.issue=1&amp;rft.pages=%3Cspan+class%3D%22nowrap%22%3E28-%3C%2Fspan%3E34&amp;rft.date=1999-01&amp;rft_id=info%3Apmid%2F9892179&amp;rft.aulast=Wesierska-Gadek&amp;rft.aufirst=J&amp;rft.au=Wang%2C+ZQ&amp;rft.au=Schmid%2C+G&amp;rft_id=https%3A%2F%2Faacrjournals.org%2Fcancerres%2Farticle%2F59%2F1%2F28%2F505067%2FReduced-Stability-of-Regularly-Spliced-but-not&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3AGene+expression" class="Z3988"></span></span> </li> <li id="cite_note-123"><span class="mw-cite-backlink"><b><a href="#cite_ref-123">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFPadhiSinghRosalesPelletier2018" class="citation journal cs1">Padhi BK, Singh M, Rosales M, Pelletier G, Cakmak S (May 2018). <a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6006387">"A PCR-based quantitative assay for the evaluation of mRNA integrity in rat samples"</a>. <i>Biomolecular Detection and Quantification</i>. <b>15</b>: <span class="nowrap">18–</span>23. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1016%2Fj.bdq.2018.02.001">10.1016/j.bdq.2018.02.001</a>. <a href="/wiki/PMC_(identifier)" class="mw-redirect" title="PMC (identifier)">PMC</a> <span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6006387">6006387</a></span>. <a href="/wiki/PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a> <a rel="nofollow" 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class="mw-cite-backlink"><b><a href="#cite_ref-124">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFKwonRicke2011" class="citation book cs1">Kwon YM, Ricke SC (2011-03-22). <a rel="nofollow" class="external text" href="https://link.springer.com/book/10.1007/978-1-61779-089-8"><i>High-Throughput Next Generation Sequencing</i></a>. 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href="https://pubmed.ncbi.nlm.nih.gov/17932051">17932051</a>.</cite><span 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class="Z3988"></span></span> </li> </ol></div></div> </section><div class="mw-heading mw-heading2 section-heading" onclick="mfTempOpenSection(10)"><span class="indicator mf-icon mf-icon-expand mf-icon--small"></span><h2 id="External_links">External links</h2><span class="mw-editsection"> <a role="button" href="/w/index.php?title=Gene_expression&amp;action=edit&amp;section=35" title="Edit section: External links" class="cdx-button cdx-button--size-large cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--icon-only cdx-button--weight-quiet "> <span class="minerva-icon minerva-icon--edit"></span> <span>edit</span> </a> </span> </div><section class="mf-section-10 collapsible-block" id="mf-section-10"> <ul><li><a rel="nofollow" class="external text" href="http://plantregmap.cbi.pku.edu.cn/">Plant Transcription Factor Database and Plant Transcriptional Regulation Data and Analysis Platform</a></li></ul> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" 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MediaWiki\Extension\Scribunto\Engines\LuaSandbox\LuaSandboxCallback::match 40 ms 3.8% MediaWiki\Extension\Scribunto\Engines\LuaSandbox\LuaSandboxCallback::get 40 ms 3.8% <mwInit.lua:45> 40 ms 3.8% dataWrapper <mw.lua:672> 40 ms 3.8% MediaWiki\Extension\Scribunto\Engines\LuaSandbox\LuaSandboxCallback::preprocess 40 ms 3.8% [others] 240 ms 22.6% Number of Wikibase entities loaded: 1/400 --> <!-- Transclusion expansion time report (%,ms,calls,template) 100.00% 1552.993 1 -total 62.74% 974.294 1 Template:Reflist 51.55% 800.581 131 Template:Cite_journal 14.28% 221.721 1 Template:Biochemistry_sidebar 13.58% 210.896 1 Template:Sidebar_with_collapsible_lists 7.28% 112.998 3 Template:Excerpt 4.91% 76.242 1 Template:Short_description 3.21% 49.917 2 Template:Pagetype 3.02% 46.895 1 Template:Authority_control 2.96% 45.900 10 Template:Cite_book --> <!-- Saved in parser cache with key enwiki:pcache:159266:|#|:idhash:canonical and timestamp 20250216221913 and revision id 1276104698. Rendering was triggered because: page-edit --> </section></div> <!-- MobileFormatter took 0.047 seconds --><!--esi <esi:include src="/esitest-fa8a495983347898/content" /> --><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?useformat=mobile&amp;type=1x1&amp;usesul3=0" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Retrieved from "<a dir="ltr" href="https://en.wikipedia.org/w/index.php?title=Gene_expression&amp;oldid=1276104698">https://en.wikipedia.org/w/index.php?title=Gene_expression&amp;oldid=1276104698</a>"</div></div> </div> <div class="post-content" id="page-secondary-actions"> </div> </main> <footer class="mw-footer minerva-footer" role="contentinfo"> <a class="last-modified-bar" href="/w/index.php?title=Gene_expression&amp;action=history"> <div class="post-content last-modified-bar__content"> <span class="minerva-icon minerva-icon-size-medium minerva-icon--modified-history"></span> <span class="last-modified-bar__text modified-enhancement" data-user-name="ScientificPages" data-user-gender="unknown" data-timestamp="1739744341"> <span>Last edited on 16 February 2025, at 22:19</span> </span> <span class="minerva-icon minerva-icon-size-small minerva-icon--expand"></span> </div> </a> <div class="post-content footer-content"> <div id='mw-data-after-content'> <div class="read-more-container"></div> </div> <div id="p-lang"> <h4>Languages</h4> <section> <ul id="p-variants" class="minerva-languages"></ul> <ul class="minerva-languages"><li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%AA%D8%B9%D8%A8%D9%8A%D8%B1_%D8%AC%D9%8A%D9%86%D9%8A" title="تعبير جيني – Arabic" lang="ar" hreflang="ar" data-title="تعبير جيني" data-language-autonym="العربية" data-language-local-name="Arabic" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-bn mw-list-item"><a href="https://bn.wikipedia.org/wiki/%E0%A6%AC%E0%A6%82%E0%A6%B6%E0%A6%BE%E0%A6%A3%E0%A7%81_%E0%A6%85%E0%A6%AD%E0%A6%BF%E0%A6%AC%E0%A7%8D%E0%A6%AF%E0%A6%95%E0%A7%8D%E0%A6%A4%E0%A6%BF" title="বংশাণু অভিব্যক্তি – Bangla" lang="bn" hreflang="bn" data-title="বংশাণু অভিব্যক্তি" data-language-autonym="বাংলা" data-language-local-name="Bangla" class="interlanguage-link-target"><span>বাংলা</span></a></li><li class="interlanguage-link interwiki-zh-min-nan mw-list-item"><a href="https://zh-min-nan.wikipedia.org/wiki/%C3%9Bi-tho%C3%A2n-ch%C3%BA_hoat-hi%C4%81n" title="Ûi-thoân-chú hoat-hiān – Minnan" lang="nan" hreflang="nan" data-title="Ûi-thoân-chú hoat-hiān" data-language-autonym="閩南語 / Bân-lâm-gú" data-language-local-name="Minnan" class="interlanguage-link-target"><span>閩南語 / Bân-lâm-gú</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%93%D0%B5%D0%BD%D0%BD%D0%B0_%D0%B5%D0%BA%D1%81%D0%BF%D1%80%D0%B5%D1%81%D0%B8%D1%8F" title="Генна експресия – Bulgarian" lang="bg" hreflang="bg" data-title="Генна експресия" data-language-autonym="Български" data-language-local-name="Bulgarian" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-bs mw-list-item"><a href="https://bs.wikipedia.org/wiki/Ekspresija_gena" title="Ekspresija gena – Bosnian" lang="bs" hreflang="bs" data-title="Ekspresija gena" data-language-autonym="Bosanski" data-language-local-name="Bosnian" class="interlanguage-link-target"><span>Bosanski</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Expressi%C3%B3_g%C3%A8nica" title="Expressió gènica – Catalan" lang="ca" hreflang="ca" data-title="Expressió gènica" data-language-autonym="Català" data-language-local-name="Catalan" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Exprese_genu" title="Exprese genu – Czech" lang="cs" hreflang="cs" data-title="Exprese genu" data-language-autonym="Čeština" data-language-local-name="Czech" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Genexpression" title="Genexpression – German" lang="de" hreflang="de" data-title="Genexpression" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/Geeniekspressioon" title="Geeniekspressioon – Estonian" lang="et" hreflang="et" data-title="Geeniekspressioon" data-language-autonym="Eesti" data-language-local-name="Estonian" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%93%CE%BF%CE%BD%CE%B9%CE%B4%CE%B9%CE%B1%CE%BA%CE%AE_%CE%AD%CE%BA%CF%86%CF%81%CE%B1%CF%83%CE%B7" title="Γονιδιακή έκφραση – Greek" lang="el" hreflang="el" data-title="Γονιδιακή έκφραση" data-language-autonym="Ελληνικά" data-language-local-name="Greek" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Expresi%C3%B3n_g%C3%A9nica" title="Expresión génica – Spanish" lang="es" hreflang="es" data-title="Expresión génica" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-eo mw-list-item"><a href="https://eo.wikipedia.org/wiki/Genesprimo" title="Genesprimo – Esperanto" lang="eo" hreflang="eo" data-title="Genesprimo" data-language-autonym="Esperanto" data-language-local-name="Esperanto" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Gene-adierazpen" title="Gene-adierazpen – Basque" lang="eu" hreflang="eu" data-title="Gene-adierazpen" data-language-autonym="Euskara" data-language-local-name="Basque" class="interlanguage-link-target"><span>Euskara</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%A8%DB%8C%D8%A7%D9%86_%DA%98%D9%86" title="بیان ژن – Persian" lang="fa" hreflang="fa" data-title="بیان ژن" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Expression_g%C3%A9nique" title="Expression génique – French" lang="fr" hreflang="fr" data-title="Expression génique" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-gl mw-list-item"><a href="https://gl.wikipedia.org/wiki/Expresi%C3%B3n_x%C3%A9nica" title="Expresión xénica – Galician" lang="gl" hreflang="gl" data-title="Expresión xénica" data-language-autonym="Galego" data-language-local-name="Galician" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EC%9C%A0%EC%A0%84%EC%9E%90_%EB%B0%9C%ED%98%84" title="유전자 발현 – Korean" lang="ko" hreflang="ko" data-title="유전자 발현" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D4%B3%D5%A5%D5%B6%D5%A5%D6%80%D5%AB_%D5%A7%D6%84%D5%BD%D5%BA%D6%80%D5%A5%D5%BD%D5%AB%D5%A1" title="Գեների էքսպրեսիա – Armenian" lang="hy" hreflang="hy" data-title="Գեների էքսպրեսիա" data-language-autonym="Հայերեն" data-language-local-name="Armenian" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%9C%E0%A5%80%E0%A4%A8_%E0%A4%B5%E0%A5%8D%E0%A4%AF%E0%A4%B5%E0%A4%B9%E0%A4%BE%E0%A4%B0" title="जीन व्यवहार – Hindi" lang="hi" hreflang="hi" data-title="जीन व्यवहार" data-language-autonym="हिन्दी" data-language-local-name="Hindi" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/Genski_izra%C5%BEaj" title="Genski izražaj – Croatian" lang="hr" hreflang="hr" data-title="Genski izražaj" data-language-autonym="Hrvatski" data-language-local-name="Croatian" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Ekspresi_gen" title="Ekspresi gen – Indonesian" lang="id" hreflang="id" data-title="Ekspresi gen" data-language-autonym="Bahasa Indonesia" data-language-local-name="Indonesian" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Espressione_genica" title="Espressione genica – Italian" lang="it" hreflang="it" data-title="Espressione genica" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%94%D7%AA%D7%91%D7%98%D7%90%D7%95%D7%AA_%D7%92%D7%A0%D7%99%D7%9D" title="התבטאות גנים – Hebrew" lang="he" hreflang="he" data-title="התבטאות גנים" data-language-autonym="עברית" data-language-local-name="Hebrew" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-kk mw-list-item"><a href="https://kk.wikipedia.org/wiki/%D0%93%D0%B5%D0%BD%D0%BD%D1%96%D2%A3_%D1%8D%D0%BA%D1%81%D0%BF%D1%80%D0%B5%D1%81%D1%81%D0%B8%D1%8F%D1%81%D1%8B" title="Геннің экспрессиясы – Kazakh" lang="kk" hreflang="kk" data-title="Геннің экспрессиясы" data-language-autonym="Қазақша" data-language-local-name="Kazakh" class="interlanguage-link-target"><span>Қазақша</span></a></li><li class="interlanguage-link interwiki-ku mw-list-item"><a href="https://ku.wikipedia.org/wiki/Derbir%C3%AEna_gen" title="Derbirîna gen – Kurdish" lang="ku" hreflang="ku" data-title="Derbirîna gen" data-language-autonym="Kurdî" data-language-local-name="Kurdish" class="interlanguage-link-target"><span>Kurdî</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/%D0%93%D0%B5%D0%BD%D1%81%D0%BA%D0%B0_%D0%B5%D0%BA%D1%81%D0%BF%D1%80%D0%B5%D1%81%D0%B8%D1%98%D0%B0" title="Генска експресија – Macedonian" lang="mk" hreflang="mk" data-title="Генска експресија" data-language-autonym="Македонски" data-language-local-name="Macedonian" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Genexpressie" title="Genexpressie – Dutch" lang="nl" hreflang="nl" data-title="Genexpressie" data-language-autonym="Nederlands" data-language-local-name="Dutch" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E9%81%BA%E4%BC%9D%E5%AD%90%E7%99%BA%E7%8F%BE" title="遺伝子発現 – Japanese" lang="ja" hreflang="ja" data-title="遺伝子発現" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Genuttrykk" title="Genuttrykk – Norwegian Bokmål" lang="nb" hreflang="nb" data-title="Genuttrykk" data-language-autonym="Norsk bokmål" data-language-local-name="Norwegian Bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-oc mw-list-item"><a href="https://oc.wikipedia.org/wiki/Expression_genica" title="Expression genica – Occitan" lang="oc" hreflang="oc" data-title="Expression genica" data-language-autonym="Occitan" data-language-local-name="Occitan" class="interlanguage-link-target"><span>Occitan</span></a></li><li class="interlanguage-link interwiki-ps mw-list-item"><a href="https://ps.wikipedia.org/wiki/%D8%AF_%D8%AC%D9%8A%D9%86_%DA%85%D8%B1%DA%AB%D9%86%D8%AF%DB%90%D8%AF%D9%84" title="د جين څرګندېدل – Pashto" lang="ps" hreflang="ps" data-title="د جين څرګندېدل" data-language-autonym="پښتو" data-language-local-name="Pashto" class="interlanguage-link-target"><span>پښتو</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Ekspresja_genu" title="Ekspresja genu – Polish" lang="pl" hreflang="pl" data-title="Ekspresja genu" data-language-autonym="Polski" data-language-local-name="Polish" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Express%C3%A3o_g%C3%A9nica" title="Expressão génica – Portuguese" lang="pt" hreflang="pt" data-title="Expressão génica" data-language-autonym="Português" data-language-local-name="Portuguese" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/Exprimare_genetic%C4%83" title="Exprimare genetică – Romanian" lang="ro" hreflang="ro" data-title="Exprimare genetică" data-language-autonym="Română" data-language-local-name="Romanian" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%AD%D0%BA%D1%81%D0%BF%D1%80%D0%B5%D1%81%D1%81%D0%B8%D1%8F_%D0%B3%D0%B5%D0%BD%D0%BE%D0%B2" title="Экспрессия генов – Russian" lang="ru" hreflang="ru" data-title="Экспрессия генов" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Gene_expression" title="Gene expression – Simple English" lang="en-simple" hreflang="en-simple" data-title="Gene expression" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/Ekspresija_gena" title="Ekspresija gena – Serbian" lang="sr" hreflang="sr" data-title="Ekspresija gena" data-language-autonym="Српски / srpski" data-language-local-name="Serbian" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-sh mw-list-item"><a href="https://sh.wikipedia.org/wiki/Ekspresija_gena" title="Ekspresija gena – Serbo-Croatian" lang="sh" hreflang="sh" data-title="Ekspresija gena" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="Serbo-Croatian" class="interlanguage-link-target"><span>Srpskohrvatski / српскохрватски</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Geenin_ilmentyminen" title="Geenin ilmentyminen – Finnish" lang="fi" hreflang="fi" data-title="Geenin ilmentyminen" data-language-autonym="Suomi" data-language-local-name="Finnish" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Genuttryck" title="Genuttryck – Swedish" lang="sv" hreflang="sv" data-title="Genuttryck" data-language-autonym="Svenska" data-language-local-name="Swedish" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-ta mw-list-item"><a href="https://ta.wikipedia.org/wiki/%E0%AE%AE%E0%AE%B0%E0%AE%AA%E0%AE%A3%E0%AF%81_%E0%AE%B5%E0%AF%86%E0%AE%B3%E0%AE%BF%E0%AE%AA%E0%AF%8D%E0%AE%AA%E0%AE%BE%E0%AE%9F%E0%AF%81" title="மரபணு வெளிப்பாடு – Tamil" lang="ta" hreflang="ta" data-title="மரபணு வெளிப்பாடு" data-language-autonym="தமிழ்" data-language-local-name="Tamil" class="interlanguage-link-target"><span>தமிழ்</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/%E0%B8%81%E0%B8%B2%E0%B8%A3%E0%B9%81%E0%B8%AA%E0%B8%94%E0%B8%87%E0%B8%AD%E0%B8%AD%E0%B8%81%E0%B8%82%E0%B8%AD%E0%B8%87%E0%B8%A2%E0%B8%B5%E0%B8%99" title="การแสดงออกของยีน – Thai" lang="th" hreflang="th" data-title="การแสดงออกของยีน" data-language-autonym="ไทย" data-language-local-name="Thai" class="interlanguage-link-target"><span>ไทย</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Gen_ifadesi" title="Gen ifadesi – Turkish" lang="tr" hreflang="tr" data-title="Gen ifadesi" data-language-autonym="Türkçe" data-language-local-name="Turkish" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%95%D0%BA%D1%81%D0%BF%D1%80%D0%B5%D1%81%D1%96%D1%8F_%D0%B3%D0%B5%D0%BD%D1%96%D0%B2" title="Експресія генів – Ukrainian" lang="uk" hreflang="uk" data-title="Експресія генів" data-language-autonym="Українська" data-language-local-name="Ukrainian" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-ur mw-list-item"><a href="https://ur.wikipedia.org/wiki/%D8%AA%D8%B9%D8%A8%DB%8C%D8%B1%D9%88%D8%B1%D8%A7%D8%AB%DB%81" title="تعبیروراثہ – Urdu" lang="ur" hreflang="ur" data-title="تعبیروراثہ" data-language-autonym="اردو" data-language-local-name="Urdu" class="interlanguage-link-target"><span>اردو</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/Bi%E1%BB%83u_hi%E1%BB%87n_gen" title="Biểu hiện gen – Vietnamese" lang="vi" hreflang="vi" data-title="Biểu hiện gen" data-language-autonym="Tiếng Việt" data-language-local-name="Vietnamese" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E5%9F%BA%E5%9B%A0%E8%A1%A8%E7%8F%BE" title="基因表現 – Chinese" lang="zh" hreflang="zh" data-title="基因表現" data-language-autonym="中文" data-language-local-name="Chinese" class="interlanguage-link-target"><span>中文</span></a></li></ul> </section> </div> <div class="minerva-footer-logo"><img src="/static/images/mobile/copyright/wikipedia-wordmark-en.svg" alt="Wikipedia" width="120" height="18" style="width: 7.5em; height: 1.125em;"/> </div> <ul id="footer-info" class="footer-info hlist hlist-separated"> <li id="footer-info-lastmod"> This page was last edited on 16 February 2025, at 22:19<span class="anonymous-show">&#160;(UTC)</span>.</li> <li id="footer-info-copyright">Content is available under <a class="external" rel="nofollow" href="https://creativecommons.org/licenses/by-sa/4.0/deed.en">CC BY-SA 4.0</a> unless otherwise noted.</li> </ul> <ul id="footer-places" class="footer-places hlist hlist-separated"> <li id="footer-places-privacy"><a href="https://foundation.wikimedia.org/wiki/Special:MyLanguage/Policy:Privacy_policy">Privacy policy</a></li> 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