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Enhancer (genetics) - Wikipedia

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class="vector-toc-list"> <li id="toc-Role_in_gene_expression" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Role_in_gene_expression"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.1</span> <span>Role in gene expression</span> </div> </a> <ul id="toc-Role_in_gene_expression-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Theories" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Theories"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Theories</span> </div> </a> <ul id="toc-Theories-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Examples_in_the_human_genome" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Examples_in_the_human_genome"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Examples in the human genome</span> </div> </a> <button aria-controls="toc-Examples_in_the_human_genome-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Examples in the human genome subsection</span> </button> <ul id="toc-Examples_in_the_human_genome-sublist" class="vector-toc-list"> <li id="toc-HACNS1" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#HACNS1"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.1</span> <span>HACNS1</span> </div> </a> <ul id="toc-HACNS1-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-GADD45G" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#GADD45G"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.2</span> <span>GADD45G</span> </div> </a> <ul id="toc-GADD45G-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-In_developmental_biology" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#In_developmental_biology"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>In developmental biology</span> </div> </a> <button aria-controls="toc-In_developmental_biology-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle In developmental biology subsection</span> </button> <ul id="toc-In_developmental_biology-sublist" class="vector-toc-list"> <li id="toc-Identification_and_characterization" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Identification_and_characterization"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.1</span> <span>Identification and characterization</span> </div> </a> <ul id="toc-Identification_and_characterization-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-In_segmentation_of_insects" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#In_segmentation_of_insects"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.2</span> <span>In segmentation of insects</span> </div> </a> <ul id="toc-In_segmentation_of_insects-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-In_vertebrate_patterning" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#In_vertebrate_patterning"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.3</span> <span>In vertebrate patterning</span> </div> </a> <ul id="toc-In_vertebrate_patterning-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Multiple_enhancers_promote_developmental_robustness" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Multiple_enhancers_promote_developmental_robustness"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.4</span> <span>Multiple enhancers promote developmental robustness</span> </div> </a> <ul id="toc-Multiple_enhancers_promote_developmental_robustness-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Evolution_of_developmental_mechanisms" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Evolution_of_developmental_mechanisms"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Evolution of developmental mechanisms</span> </div> </a> <button aria-controls="toc-Evolution_of_developmental_mechanisms-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Evolution of developmental mechanisms subsection</span> </button> <ul id="toc-Evolution_of_developmental_mechanisms-sublist" class="vector-toc-list"> <li id="toc-Stickleback_Pitx1" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Stickleback_Pitx1"> <div class="vector-toc-text"> <span class="vector-toc-numb">5.1</span> <span>Stickleback <i>Pitx1</i></span> </div> </a> <ul id="toc-Stickleback_Pitx1-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-In_Drosophila_wing_pattern_evolution" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#In_Drosophila_wing_pattern_evolution"> <div class="vector-toc-text"> <span class="vector-toc-numb">5.2</span> <span>In <i>Drosophila</i> wing pattern evolution</span> </div> </a> <ul id="toc-In_Drosophila_wing_pattern_evolution-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-In_inflammation_and_cancer" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#In_inflammation_and_cancer"> <div class="vector-toc-text"> <span class="vector-toc-numb">5.3</span> <span>In inflammation and cancer</span> </div> </a> <ul id="toc-In_inflammation_and_cancer-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Designing_enhancers_in_synthetic_biology" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Designing_enhancers_in_synthetic_biology"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>Designing enhancers in synthetic biology</span> </div> </a> <ul id="toc-Designing_enhancers_in_synthetic_biology-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-See_also" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#See_also"> <div class="vector-toc-text"> <span class="vector-toc-numb">7</span> <span>See also</span> </div> </a> <ul id="toc-See_also-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-References" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#References"> <div class="vector-toc-text"> <span class="vector-toc-numb">8</span> <span>References</span> </div> </a> <ul id="toc-References-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-External_links" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#External_links"> <div class="vector-toc-text"> <span class="vector-toc-numb">9</span> <span>External links</span> </div> </a> <ul id="toc-External_links-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Contents" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " 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Available in 28 languages" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-28" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">28 languages</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D9%85%D8%B9%D8%B2%D8%B2" title="معزز – Arabic" lang="ar" hreflang="ar" data-title="معزز" data-language-autonym="العربية" data-language-local-name="Arabic" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Amplificador_gen%C3%A8tic" title="Amplificador genètic – Catalan" lang="ca" hreflang="ca" data-title="Amplificador genètic" 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/Enhancer" title="Enhancer – Czech" lang="cs" hreflang="cs" data-title="Enhancer" 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/Enhancer_(Genetik)" title="Enhancer (Genetik) – German" lang="de" hreflang="de" data-title="Enhancer (Genetik)" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%95%CE%BD%CE%B9%CF%83%CF%87%CF%85%CF%84%CE%AE%CF%82_(%CE%B3%CE%B5%CE%BD%CE%B5%CF%84%CE%B9%CE%BA%CE%AE)" title="Ενισχυτής (γενετική) – Greek" lang="el" hreflang="el" data-title="Ενισχυτής (γενετική)" 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/Enhancer" title="Enhancer – Spanish" lang="es" hreflang="es" data-title="Enhancer" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%A7%D9%81%D8%B2%D8%A7%DB%8C%D8%B4%DA%AF%D8%B1" title="افزایشگر – Persian" lang="fa" hreflang="fa" data-title="افزایشگر" 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/Amplificateur_(biologie)" title="Amplificateur (biologie) – French" lang="fr" hreflang="fr" data-title="Amplificateur (biologie)" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ga mw-list-item"><a href="https://ga.wikipedia.org/wiki/Feabhsaitheoir_(bitheola%C3%ADocht)" title="Feabhsaitheoir (bitheolaíocht) – Irish" lang="ga" hreflang="ga" data-title="Feabhsaitheoir (bitheolaíocht)" data-language-autonym="Gaeilge" data-language-local-name="Irish" class="interlanguage-link-target"><span>Gaeilge</span></a></li><li class="interlanguage-link interwiki-gl mw-list-item"><a href="https://gl.wikipedia.org/wiki/Amplificador_xen%C3%A9tico" title="Amplificador xenético – Galician" lang="gl" hreflang="gl" data-title="Amplificador xenético" data-language-autonym="Galego" data-language-local-name="Galician" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/Poja%C4%8Diva%C4%8D_(genetika)" title="Pojačivač (genetika) – Croatian" lang="hr" hreflang="hr" data-title="Pojačivač (genetika)" 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/Peningkat_(genetik)" title="Peningkat (genetik) – Indonesian" lang="id" hreflang="id" data-title="Peningkat (genetik)" 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/Enhancer" title="Enhancer – Italian" lang="it" hreflang="it" data-title="Enhancer" 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%9E%D7%A2%D7%A6%D7%9D" title="מעצם – Hebrew" lang="he" hreflang="he" data-title="מעצם" data-language-autonym="עברית" data-language-local-name="Hebrew" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-ka mw-list-item"><a href="https://ka.wikipedia.org/wiki/%E1%83%94%E1%83%9C%E1%83%B0%E1%83%90%E1%83%9C%E1%83%A1%E1%83%94%E1%83%A0%E1%83%98_(%E1%83%92%E1%83%94%E1%83%9C%E1%83%94%E1%83%A2%E1%83%98%E1%83%99%E1%83%90)" title="ენჰანსერი (გენეტიკა) – Georgian" lang="ka" hreflang="ka" data-title="ენჰანსერი (გენეტიკა)" data-language-autonym="ქართული" data-language-local-name="Georgian" class="interlanguage-link-target"><span>ქართული</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Enhancer" title="Enhancer – Dutch" lang="nl" hreflang="nl" data-title="Enhancer" 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/%E3%82%A8%E3%83%B3%E3%83%8F%E3%83%B3%E3%82%B5%E3%83%BC" title="エンハンサー – Japanese" lang="ja" hreflang="ja" data-title="エンハンサー" 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/Enhancer" title="Enhancer – Norwegian Bokmål" lang="nb" hreflang="nb" data-title="Enhancer" 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-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Wzmacniacz_transkrypcji" title="Wzmacniacz transkrypcji – Polish" lang="pl" hreflang="pl" data-title="Wzmacniacz transkrypcji" 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/Acentuassomo" title="Acentuassomo – Portuguese" lang="pt" hreflang="pt" data-title="Acentuassomo" data-language-autonym="Português" data-language-local-name="Portuguese" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%AD%D0%BD%D1%85%D0%B0%D0%BD%D1%81%D0%B5%D1%80" title="Энхансер – Russian" lang="ru" hreflang="ru" data-title="Энхансер" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/Poja%C4%8Diva%C4%8D_(genetika)" title="Pojačivač (genetika) – Serbian" lang="sr" hreflang="sr" data-title="Pojačivač (genetika)" 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/Poja%C4%8Diva%C4%8D_(genetika)" title="Pojačivač (genetika) – Serbo-Croatian" lang="sh" hreflang="sh" data-title="Pojačivač (genetika)" 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-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Enhancer_(genetik)" title="Enhancer (genetik) – Swedish" lang="sv" hreflang="sv" data-title="Enhancer (genetik)" data-language-autonym="Svenska" data-language-local-name="Swedish" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/H%C4%B1zland%C4%B1r%C4%B1c%C4%B1" title="Hızlandırıcı – Turkish" lang="tr" hreflang="tr" data-title="Hızlandırıcı" 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%BD%D1%85%D0%B0%D0%BD%D1%81%D0%B5%D1%80" title="Енхансер – Ukrainian" lang="uk" hreflang="uk" data-title="Енхансер" data-language-autonym="Українська" data-language-local-name="Ukrainian" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/Tr%C3%ACnh_t%E1%BB%B1_t%C4%83ng_c%C6%B0%E1%BB%9Dng_(di_truy%E1%BB%81n)" title="Trình tự tăng cường (di truyền) – Vietnamese" lang="vi" hreflang="vi" data-title="Trình tự tăng cường (di truyền)" 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%BC%B7%E5%8C%96%E5%AD%90" title="強化子 – Chinese" lang="zh" hreflang="zh" data-title="強化子" data-language-autonym="中文" data-language-local-name="Chinese" class="interlanguage-link-target"><span>中文</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q913367#sitelinks-wikipedia" title="Edit interlanguage links" class="wbc-editpage">Edit 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id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">DNA sequence that binds activators to increase the likelihood of gene transcription</div> <p class="mw-empty-elt"> </p> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Gene_enhancer.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/1/12/Gene_enhancer.svg/250px-Gene_enhancer.svg.png" decoding="async" width="250" height="76" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/12/Gene_enhancer.svg/375px-Gene_enhancer.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/12/Gene_enhancer.svg/500px-Gene_enhancer.svg.png 2x" data-file-width="400" data-file-height="122" /></a><figcaption></figcaption></figure> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Enhancer_Nucleotide_Sequence.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/6/6f/Enhancer_Nucleotide_Sequence.svg/220px-Enhancer_Nucleotide_Sequence.svg.png" decoding="async" width="220" height="273" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/6f/Enhancer_Nucleotide_Sequence.svg/330px-Enhancer_Nucleotide_Sequence.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/6f/Enhancer_Nucleotide_Sequence.svg/440px-Enhancer_Nucleotide_Sequence.svg.png 2x" data-file-width="512" data-file-height="635" /></a><figcaption>Seen here is a four step diagram depicting the usage of an enhancer. Within this DNA sequence, protein(s) known as transcription factor(s) bind to the enhancer and increase the activity of the promoter. <div><ol><li>DNA</li><li>Enhancer</li><li>Promoter</li><li>Gene</li><li>Transcription Activator Protein</li><li>Mediator Protein</li><li>RNA Polymerase</li></ol></div></figcaption></figure> <p>In <a href="/wiki/Genetics" title="Genetics">genetics</a>, an <b>enhancer</b> is a short (50–1500 <a href="/wiki/Base_pair" title="Base pair">bp</a>) region of <a href="/wiki/DNA" title="DNA">DNA</a> that can be bound by <a href="/wiki/Protein" title="Protein">proteins</a> (<a href="/wiki/Activator_(genetics)" title="Activator (genetics)">activators</a>) to increase the likelihood that <a href="/wiki/Transcription_(genetics)" class="mw-redirect" title="Transcription (genetics)">transcription</a> of a particular <a href="/wiki/Gene" title="Gene">gene</a> will occur.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">&#91;</span>1<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-5questions_2-0" class="reference"><a href="#cite_note-5questions-2"><span class="cite-bracket">&#91;</span>2<span class="cite-bracket">&#93;</span></a></sup> These proteins are usually referred to as <a href="/wiki/Transcription_factor" title="Transcription factor">transcription factors</a>. Enhancers are <a href="/wiki/Cis-regulatory_element" title="Cis-regulatory element"><i>cis</i>-acting</a>. They can be located up to 1 Mbp (1,000,000 bp) away from the gene, upstream or downstream from the start site.<sup id="cite_ref-5questions_2-1" class="reference"><a href="#cite_note-5questions-2"><span class="cite-bracket">&#91;</span>2<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">&#91;</span>3<span class="cite-bracket">&#93;</span></a></sup> There are hundreds of thousands of enhancers in the human genome.<sup id="cite_ref-5questions_2-2" class="reference"><a href="#cite_note-5questions-2"><span class="cite-bracket">&#91;</span>2<span class="cite-bracket">&#93;</span></a></sup> They are found in both prokaryotes and eukaryotes.<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">&#91;</span>4<span class="cite-bracket">&#93;</span></a></sup> Active enhancers typically get transcribed as enhancer or regulatory non-coding RNA, whose expression levels correlate with mRNA levels of target genes.<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">&#91;</span>5<span class="cite-bracket">&#93;</span></a></sup> </p><p>The first discovery of a eukaryotic enhancer was in the <a href="/wiki/Immunoglobulin_heavy_chain" title="Immunoglobulin heavy chain">immunoglobulin heavy chain</a> gene in 1983.<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">&#91;</span>6<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">&#91;</span>7<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-A_tissue-specific_transcription_enh_8-0" class="reference"><a href="#cite_note-A_tissue-specific_transcription_enh-8"><span class="cite-bracket">&#91;</span>8<span class="cite-bracket">&#93;</span></a></sup> This enhancer, located in the large <a href="/wiki/Intron" title="Intron">intron</a>, provided an explanation for the transcriptional activation of rearranged Vh gene promoters while unrearranged Vh promoters remained inactive.<sup id="cite_ref-9" class="reference"><a href="#cite_note-9"><span class="cite-bracket">&#91;</span>9<span class="cite-bracket">&#93;</span></a></sup> Lately, enhancers have been shown to be involved in certain medical conditions, for example, <a href="/wiki/Bone_marrow_suppression" title="Bone marrow suppression">myelosuppression</a>.<sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">&#91;</span>10<span class="cite-bracket">&#93;</span></a></sup> Since 2022, scientists have used <a href="/wiki/Artificial_intelligence" title="Artificial intelligence">artificial intelligence</a> to design synthetic enhancers and applied them in animal systems, first in a cell line,<sup id="cite_ref-pmid35551305_11-0" class="reference"><a href="#cite_note-pmid35551305-11"><span class="cite-bracket">&#91;</span>11<span class="cite-bracket">&#93;</span></a></sup> and one year later also in vivo.<sup id="cite_ref-pmid38086418_12-0" class="reference"><a href="#cite_note-pmid38086418-12"><span class="cite-bracket">&#91;</span>12<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-pmid38086419_13-0" class="reference"><a href="#cite_note-pmid38086419-13"><span class="cite-bracket">&#91;</span>13<span class="cite-bracket">&#93;</span></a></sup> </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Locations">Locations</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Enhancer_(genetics)&amp;action=edit&amp;section=1" title="Edit section: Locations"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>In <a href="/wiki/Eukaryotic" class="mw-redirect" title="Eukaryotic">eukaryotic</a> cells the structure of the <a href="/wiki/Chromatin" title="Chromatin">chromatin</a> complex of DNA is folded in a way that functionally mimics the supercoiled state characteristic of <a href="/wiki/Prokaryotic" class="mw-redirect" title="Prokaryotic">prokaryotic</a> DNA, so although the enhancer DNA may be far from the gene in a linear way, it is spatially close to the <a href="/wiki/Promoter_(biology)" class="mw-redirect" title="Promoter (biology)">promoter</a> and gene. This allows it to interact with the <a href="/wiki/General_transcription_factor" title="General transcription factor">general transcription factors</a> and <a href="/wiki/RNA_polymerase_II" title="RNA polymerase II">RNA polymerase II</a>.<sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span class="cite-bracket">&#91;</span>14<span class="cite-bracket">&#93;</span></a></sup> The same mechanism holds true for <a href="/wiki/Silencer_(DNA)" class="mw-redirect" title="Silencer (DNA)">silencers</a> in the eukaryotic genome. Silencers are antagonists of enhancers that, when bound to its proper transcription factors called <a href="/wiki/Repressor" title="Repressor">repressors</a>, repress the transcription of the gene. Silencers and enhancers may be in close proximity to each other or may even be in the same region only differentiated by the transcription factor the region binds to. </p><p>An enhancer may be located <a href="/wiki/Upstream_and_downstream_(DNA)" title="Upstream and downstream (DNA)">upstream or downstream</a> of the gene it regulates. Furthermore, an enhancer does not need to be located near the <a href="/wiki/Transcription_(genetics)" class="mw-redirect" title="Transcription (genetics)">transcription</a> initiation site to affect transcription, as some have been found located several hundred thousand <a href="/wiki/Base_pairs" class="mw-redirect" title="Base pairs">base pairs</a> upstream or downstream of the start site.<sup id="cite_ref-15" class="reference"><a href="#cite_note-15"><span class="cite-bracket">&#91;</span>15<span class="cite-bracket">&#93;</span></a></sup> Enhancers do not act on the promoter region itself, but are bound by <a href="/wiki/Activator_(genetics)" title="Activator (genetics)">activator proteins</a> as first shown by in vivo competition experiments.<sup id="cite_ref-16" class="reference"><a href="#cite_note-16"><span class="cite-bracket">&#91;</span>16<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-pmid3006253_17-0" class="reference"><a href="#cite_note-pmid3006253-17"><span class="cite-bracket">&#91;</span>17<span class="cite-bracket">&#93;</span></a></sup> Subsequently, molecular studies showed direct interactions with transcription factors and cofactors, including the <a href="/wiki/Mediator_(coactivator)" title="Mediator (coactivator)">mediator complex</a>, which recruits polymerase II and the general transcription factors which then begin transcribing the genes.<sup id="cite_ref-18" class="reference"><a href="#cite_note-18"><span class="cite-bracket">&#91;</span>18<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-19" class="reference"><a href="#cite_note-19"><span class="cite-bracket">&#91;</span>19<span class="cite-bracket">&#93;</span></a></sup> Enhancers can also be found within introns. An enhancer's orientation may even be reversed without affecting its function; additionally, an enhancer may be excised and inserted elsewhere in the chromosome, and still affect gene transcription.<sup id="cite_ref-A_tissue-specific_transcription_enh_8-1" class="reference"><a href="#cite_note-A_tissue-specific_transcription_enh-8"><span class="cite-bracket">&#91;</span>8<span class="cite-bracket">&#93;</span></a></sup> That is one reason that introns <a href="/wiki/Polymorphism_(biology)" title="Polymorphism (biology)">polymorphisms</a> may have effects although they are not <a href="/wiki/Translation_(biology)" title="Translation (biology)">translated</a>.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">&#91;<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (July 2011)">citation needed</span></a></i>&#93;</sup> Enhancers can also be found at the <a href="/wiki/Exon" title="Exon">exonic</a> region of an unrelated gene<sup id="cite_ref-20" class="reference"><a href="#cite_note-20"><span class="cite-bracket">&#91;</span>20<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-BirnbaumClowney2012_21-0" class="reference"><a href="#cite_note-BirnbaumClowney2012-21"><span class="cite-bracket">&#91;</span>21<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-22" class="reference"><a href="#cite_note-22"><span class="cite-bracket">&#91;</span>22<span class="cite-bracket">&#93;</span></a></sup> and they may act on genes on another <a href="/wiki/Chromosome" title="Chromosome">chromosome</a>.<sup id="cite_ref-pmid_23-0" class="reference"><a href="#cite_note-pmid-23"><span class="cite-bracket">&#91;</span>23<span class="cite-bracket">&#93;</span></a></sup> </p><p>Enhancers are bound by <a href="/wiki/P300-CBP_coactivator_family" title="P300-CBP coactivator family">p300-CBP</a> and their location can be predicted by <a href="/wiki/ChIP-sequencing" class="mw-redirect" title="ChIP-sequencing">ChIP-seq</a> against this family of coactivators.<sup id="cite_ref-24" class="reference"><a href="#cite_note-24"><span class="cite-bracket">&#91;</span>24<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-25" class="reference"><a href="#cite_note-25"><span class="cite-bracket">&#91;</span>25<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-26" class="reference"><a href="#cite_note-26"><span class="cite-bracket">&#91;</span>26<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-27" class="reference"><a href="#cite_note-27"><span class="cite-bracket">&#91;</span>27<span class="cite-bracket">&#93;</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Role_in_gene_expression">Role in gene expression</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Enhancer_(genetics)&amp;action=edit&amp;section=2" title="Edit section: Role in gene expression"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Regulation_of_transcription_in_mammals.jpg" class="mw-file-description"><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" 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-file-width="2524" data-file-height="1372" /></a><figcaption> <b>Regulation of transcription in mammals</b>. An active enhancer regulatory region of DNA is enabled to interact with the <a href="/wiki/Promoter_(genetics)" title="Promoter (genetics)">promoter</a> DNA region of its target <a href="/wiki/Gene" title="Gene">gene</a> by the 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 (a complex consisting of about 26 proteins in an interacting structure) communicates 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. Core promoters are sufficient to direct transcription initiation, but generally have low basal activity.<sup id="cite_ref-pmid29946135_28-0" class="reference"><a href="#cite_note-pmid29946135-28"><span class="cite-bracket">&#91;</span>28<span class="cite-bracket">&#93;</span></a></sup> Other important cis-regulatory modules are localized in DNA regions that are distant from the transcription start sites. These include enhancers, <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_29-0" class="reference"><a href="#cite_note-pmid33102493-29"><span class="cite-bracket">&#91;</span>29<span class="cite-bracket">&#93;</span></a></sup> Among this constellation of elements, 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_30-0" class="reference"><a href="#cite_note-pmid22868264-30"><span class="cite-bracket">&#91;</span>30<span class="cite-bracket">&#93;</span></a></sup> An enhancer localized in a DNA region distant from the promoter of a gene can have a very large effect on gene expression, with some genes undergoing up to 100-fold increased expression due to an activated enhancer.<sup id="cite_ref-Beagan_31-0" class="reference"><a href="#cite_note-Beagan-31"><span class="cite-bracket">&#91;</span>31<span class="cite-bracket">&#93;</span></a></sup> </p><p>Enhancers are regions of the genome that are major gene-regulatory elements. 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_32-0" class="reference"><a href="#cite_note-Schoenfelder-32"><span class="cite-bracket">&#91;</span>32<span class="cite-bracket">&#93;</span></a></sup> While there are hundreds of thousands of enhancer DNA regions,<sup id="cite_ref-5questions_2-3" class="reference"><a href="#cite_note-5questions-2"><span class="cite-bracket">&#91;</span>2<span class="cite-bracket">&#93;</span></a></sup> for a particular type of tissue only specific enhancers are brought into proximity with the promoters that they regulate. In a study of brain cortical neurons, 24,937 loops were found, bringing enhancers to their target promoters.<sup id="cite_ref-Beagan_31-1" class="reference"><a href="#cite_note-Beagan-31"><span class="cite-bracket">&#91;</span>31<span class="cite-bracket">&#93;</span></a></sup> Multiple enhancers, each often at tens or hundreds of thousands of nucleotides distant from their target genes, loop to their target gene promoters and can coordinate with each other to control the expression of their common target gene.<sup id="cite_ref-Schoenfelder_32-1" class="reference"><a href="#cite_note-Schoenfelder-32"><span class="cite-bracket">&#91;</span>32<span class="cite-bracket">&#93;</span></a></sup> </p><p>The schematic illustration in this section shows an enhancer looping around to come into close physical 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>), with one member of the dimer anchored to its binding motif on the enhancer and the other member anchored to its binding motif on the promoter (represented by the red zigzags in the illustration).<sup id="cite_ref-pmid29224777_33-0" class="reference"><a href="#cite_note-pmid29224777-33"><span class="cite-bracket">&#91;</span>33<span class="cite-bracket">&#93;</span></a></sup> Several cell function specific transcription factors (there are about 1,600 transcription factors in a human cell<sup id="cite_ref-pmid29425488_34-0" class="reference"><a href="#cite_note-pmid29425488-34"><span class="cite-bracket">&#91;</span>34<span class="cite-bracket">&#93;</span></a></sup>) generally bind to specific motifs on an enhancer<sup id="cite_ref-pmid29987030_35-0" class="reference"><a href="#cite_note-pmid29987030-35"><span class="cite-bracket">&#91;</span>35<span class="cite-bracket">&#93;</span></a></sup> and a small combination of these enhancer-bound transcription factors, when brought close to a promoter by a DNA loop, govern level of transcription of the target gene. <a href="/wiki/Mediator_(coactivator)" title="Mediator (coactivator)">Mediator</a> (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_36-0" class="reference"><a href="#cite_note-pmid25693131-36"><span class="cite-bracket">&#91;</span>36<span class="cite-bracket">&#93;</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 <a href="/wiki/Enhancer_RNA" title="Enhancer RNA">Enhancer RNAs</a> (eRNAs) as illustrated in the Figure.<sup id="cite_ref-pmid29378788_37-0" class="reference"><a href="#cite_note-pmid29378788-37"><span class="cite-bracket">&#91;</span>37<span class="cite-bracket">&#93;</span></a></sup> Like <a href="/wiki/Messenger_RNA" title="Messenger RNA">mRNAs</a>, these eRNAs are usually protected by their <a href="/wiki/Five-prime_cap" title="Five-prime cap">5′ cap</a>.<sup id="cite_ref-38" class="reference"><a href="#cite_note-38"><span class="cite-bracket">&#91;</span>38<span class="cite-bracket">&#93;</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_39-0" class="reference"><a href="#cite_note-pmid12514134-39"><span class="cite-bracket">&#91;</span>39<span class="cite-bracket">&#93;</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_40-0" class="reference"><a href="#cite_note-pmid32810208-40"><span class="cite-bracket">&#91;</span>40<span class="cite-bracket">&#93;</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Theories">Theories</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Enhancer_(genetics)&amp;action=edit&amp;section=3" title="Edit section: Theories"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>As of 2005<sup class="plainlinks noexcerpt noprint asof-tag update" style="display:none;"><a class="external text" href="https://en.wikipedia.org/w/index.php?title=Enhancer_(genetics)&amp;action=edit">&#91;update&#93;</a></sup>, there are two different theories on the information processing that occurs on enhancers:<sup id="cite_ref-msu_41-0" class="reference"><a href="#cite_note-msu-41"><span class="cite-bracket">&#91;</span>41<span class="cite-bracket">&#93;</span></a></sup> </p> <ul><li><a href="/wiki/Enhanceosome" title="Enhanceosome">Enhanceosomes</a> – rely on highly cooperative, coordinated action and can be disabled by single <a href="/wiki/Point_mutations" class="mw-redirect" title="Point mutations">point mutations</a> that move or remove the binding sites of individual proteins.</li> <li>Flexible billboards – less integrative, multiple proteins independently regulate gene expression and their sum is read in by the basal transcriptional machinery.</li></ul> <div class="mw-heading mw-heading2"><h2 id="Examples_in_the_human_genome">Examples in the human genome</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Enhancer_(genetics)&amp;action=edit&amp;section=4" title="Edit section: Examples in the human genome"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading3"><h3 id="HACNS1">HACNS1</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Enhancer_(genetics)&amp;action=edit&amp;section=5" title="Edit section: HACNS1"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>HACNS1 (also known as <a href="/wiki/CENTG2" title="CENTG2">CENTG2</a> and located in the <a href="/wiki/Human_accelerated_regions" title="Human accelerated regions">Human Accelerated Region</a> 2) is a gene enhancer "that may have contributed to the evolution of the uniquely opposable <a href="/wiki/Human" title="Human">human</a> <a href="/wiki/Thumb" title="Thumb">thumb</a>, and possibly also modifications in the <a href="/wiki/Ankle" title="Ankle">ankle</a> or <a href="/wiki/Foot" title="Foot">foot</a> that allow humans to <a href="/wiki/Walk" class="mw-redirect" title="Walk">walk</a> on two legs". Evidence to date shows that of the 110,000 gene enhancer sequences identified in the human <a href="/wiki/Genome" title="Genome">genome</a>, HACNS1 has undergone the most change during the <a href="/wiki/Evolution" title="Evolution">evolution</a> of humans following the split with the ancestors of <a href="/wiki/Pan_(genus)" title="Pan (genus)">chimpanzees</a>.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">&#91;<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (February 2020)">citation needed</span></a></i>&#93;</sup> </p> <div class="mw-heading mw-heading3"><h3 id="GADD45G">GADD45G</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Enhancer_(genetics)&amp;action=edit&amp;section=6" title="Edit section: GADD45G"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>An enhancer near the gene GADD45g has been described that may regulate brain growth in chimpanzees and other mammals, but not in humans.<sup id="cite_ref-42" class="reference"><a href="#cite_note-42"><span class="cite-bracket">&#91;</span>42<span class="cite-bracket">&#93;</span></a></sup> The GADD45G regulator in mice and chimps is active in regions of the brain where cells that form the cortex, ventral forebrain, and thalamus are located and may suppress further neurogenesis. Loss of the GADD45G enhancer in humans may contribute to an increase of certain neuronal populations and to forebrain expansion in humans.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">&#91;<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (July 2011)">citation needed</span></a></i>&#93;</sup> </p> <div class="mw-heading mw-heading2"><h2 id="In_developmental_biology">In developmental biology</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Enhancer_(genetics)&amp;action=edit&amp;section=7" title="Edit section: In developmental biology"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The development, differentiation and growth of cells and tissues require precisely regulated patterns of <a href="/wiki/Gene_expression" title="Gene expression">gene expression</a>. Enhancers work as <a href="/wiki/Cis-regulatory_element" title="Cis-regulatory element">cis-regulatory elements</a> to mediate both spatial and temporal control of development by turning on <a href="/wiki/Transcription_(genetics)" class="mw-redirect" title="Transcription (genetics)">transcription</a> in specific cells and/or repressing it in other cells. Thus, the particular combination of <a href="/wiki/Transcription_factors" class="mw-redirect" title="Transcription factors">transcription factors</a> and other DNA-binding proteins in a developing tissue controls which genes will be expressed in that tissue. Enhancers allow the same gene to be used in diverse processes in space and time.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">&#91;<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (July 2011)">citation needed</span></a></i>&#93;</sup><sup id="cite_ref-43" class="reference"><a href="#cite_note-43"><span class="cite-bracket">&#91;</span>43<span class="cite-bracket">&#93;</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Identification_and_characterization">Identification and characterization</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Enhancer_(genetics)&amp;action=edit&amp;section=8" title="Edit section: Identification and characterization"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Traditionally, enhancers were identified by <a href="/wiki/Enhancer_trap" title="Enhancer trap">enhancer trap</a> techniques using a reporter gene or by comparative sequence analysis and computational genomics. In genetically tractable models such as the fruit fly <i><a href="/wiki/Drosophila_melanogaster" title="Drosophila melanogaster">Drosophila melanogaster</a>,</i> for example, a reporter construct such as the <i><a href="/wiki/LacZ" class="mw-redirect" title="LacZ">lacZ</a></i> <a href="/wiki/LacZ" class="mw-redirect" title="LacZ">gene</a> can be randomly integrated into the genome using a <a href="/wiki/P_element" title="P element">P element</a> <a href="/wiki/Transposable_element" title="Transposable element">transposon</a>. If the reporter gene integrates near an enhancer, its expression will reflect the expression pattern driven by that enhancer. Thus, staining the flies for LacZ expression or activity and cloning the sequence surrounding the integration site allows the identification of the enhancer sequence.<sup id="cite_ref-44" class="reference"><a href="#cite_note-44"><span class="cite-bracket">&#91;</span>44<span class="cite-bracket">&#93;</span></a></sup> </p><p>The development of genomic and epigenomic technologies, however, has dramatically changed the outlook for <a href="/wiki/Cis-regulatory_module" class="mw-redirect" title="Cis-regulatory module">cis-regulatory modules</a> (CRM) discovery. <a href="/wiki/DNA_sequencing" title="DNA sequencing">Next-generation sequencing</a> (NGS) methods now enable high-throughput functional CRM discovery assays, and the vastly increasing amounts of available data, including large-scale libraries of <a href="/wiki/Transcription_factor-binding_site" class="mw-redirect" title="Transcription factor-binding site">transcription factor-binding site (TFBS) motifs</a>, collections of annotated, validated CRMs, and extensive <a href="/wiki/Epigenetic" class="mw-redirect" title="Epigenetic">epigenetic</a> data across many cell types, are making accurate computational CRM discovery an attainable goal. An example of NGS-based approach called <a href="/wiki/DNase-Seq" title="DNase-Seq">DNase-seq</a> have enabled identification of nucleosome-depleted, or open chromatin regions, which can contain CRM. More recently techniques such as <a href="/wiki/ATAC-seq" title="ATAC-seq">ATAC-seq</a> have been developed which require less starting material. Nucelosome depleted regions can be identified in vivo through expression of <a href="/wiki/DamID" class="mw-redirect" title="DamID">Dam methylase</a>, allowing for greater control of cell-type specific enhancer identification.<sup id="cite_ref-45" class="reference"><a href="#cite_note-45"><span class="cite-bracket">&#91;</span>45<span class="cite-bracket">&#93;</span></a></sup> Computational methods include <a href="/wiki/Comparative_genomics" title="Comparative genomics">comparative genomics</a>, clustering of known or predicted TF-binding sites, and supervised machine-learning approaches trained on known CRMs. All of these methods have proven effective for CRM discovery, but each has its own considerations and limitations, and each is subject to a greater or lesser number of false-positive identifications.<sup id="cite_ref-46" class="reference"><a href="#cite_note-46"><span class="cite-bracket">&#91;</span>46<span class="cite-bracket">&#93;</span></a></sup> In the <a href="/wiki/Comparative_genomics" title="Comparative genomics">comparative genomics</a> approach, <a href="/wiki/Conserved_sequence" title="Conserved sequence">sequence conservation</a> of <a href="/wiki/Noncoding_DNA" class="mw-redirect" title="Noncoding DNA">non-coding regions</a> can be indicative of enhancers. Sequences from multiple species are aligned, and conserved regions are identified computationally.<sup id="cite_ref-Doisemcdb_47-0" class="reference"><a href="#cite_note-Doisemcdb-47"><span class="cite-bracket">&#91;</span>47<span class="cite-bracket">&#93;</span></a></sup> Identified sequences can then be attached to a reporter gene such as <a href="/wiki/Green_fluorescent_protein" title="Green fluorescent protein">green fluorescent protein</a> or lacZ to determine the <i>in vivo</i> pattern of gene expression produced by the enhancer when injected into an embryo. <a href="/wiki/Messenger_RNA" title="Messenger RNA">mRNA</a> expression of the reporter can be visualized by <i><a href="/wiki/In_situ_hybridization" title="In situ hybridization">in situ</a></i> <a href="/wiki/In_situ_hybridization" title="In situ hybridization">hybridization</a>, which provides a more direct measure of enhancer activity, since it is not subjected to the complexities of <a href="/wiki/Translation_(biology)" title="Translation (biology)">translation</a> and <a href="/wiki/Protein_folding" title="Protein folding">protein folding</a>. Although much evidence has pointed to sequence conservation for critical developmental enhancers, other work has shown that the function of enhancers can be conserved with little or no primary sequence conservation. For example, the <i>RET</i> enhancers in humans have very little sequence conservation to those in <a href="/wiki/Zebrafish" title="Zebrafish">zebrafish</a>, yet both species' sequences produce nearly identical patterns of reporter gene expression in zebrafish.<sup id="cite_ref-Doisemcdb_47-1" class="reference"><a href="#cite_note-Doisemcdb-47"><span class="cite-bracket">&#91;</span>47<span class="cite-bracket">&#93;</span></a></sup> Similarly, in highly diverged insects (separated by around 350 million years), similar gene expression patterns of several key genes was found to be regulated through similarly constituted CRMs although these CRMs do not show any appreciable sequence conservation detectable by standard sequence alignment methods such as <a href="/wiki/BLAST_(biotechnology)" title="BLAST (biotechnology)">BLAST</a>.<sup id="cite_ref-48" class="reference"><a href="#cite_note-48"><span class="cite-bracket">&#91;</span>48<span class="cite-bracket">&#93;</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="In_segmentation_of_insects">In segmentation of insects</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Enhancer_(genetics)&amp;action=edit&amp;section=9" title="Edit section: In segmentation of insects"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The enhancers determining early <a href="/wiki/Segmentation_(biology)" title="Segmentation (biology)">segmentation</a> in <i><a href="/wiki/Drosophila_melanogaster" title="Drosophila melanogaster">Drosophila melanogaster</a></i> embryos are among the best characterized developmental enhancers. In the early fly embryo, the <a href="/wiki/Gap_gene" title="Gap gene">gap gene</a> transcription factors are responsible for activating and repressing a number of segmentation genes, such as the <a href="/wiki/Pair_rule_genes" class="mw-redirect" title="Pair rule genes">pair rule genes</a>. The gap genes are expressed in blocks along the anterior-posterior axis of the fly along with other <a href="/wiki/Maternal_effect" title="Maternal effect">maternal effect</a> transcription factors, thus creating zones within which different combinations of transcription factors are expressed. The pair-rule genes are separated from one another by non-expressing cells. Moreover, the stripes of expression for different pair-rule genes are offset by a few cell diameters from one another. Thus, unique combinations of pair-rule gene expression create spatial domains along the anterior-posterior axis to set up each of the 14 individual segments. The 480 bp enhancer responsible for driving the sharp stripe two of the pair-rule gene <i>even-skipped</i> (<i>eve</i>) has been well-characterized. The enhancer contains 12 different binding sites for maternal and gap gene transcription factors. Activating and repressing sites overlap in sequence. <i>Eve</i> is only expressed in a narrow stripe of cells that contain high concentrations of the activators and low concentration of the repressors for this enhancer sequence. Other enhancer regions drive <i>eve</i> expression in 6 other stripes in the embryo.<sup id="cite_ref-49" class="reference"><a href="#cite_note-49"><span class="cite-bracket">&#91;</span>49<span class="cite-bracket">&#93;</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="In_vertebrate_patterning">In vertebrate patterning</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Enhancer_(genetics)&amp;action=edit&amp;section=10" title="Edit section: In vertebrate patterning"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Establishing body axes is a critical step in animal development. During mouse embryonic development, <a href="/wiki/NODAL" class="mw-redirect" title="NODAL">Nodal</a>, a <a href="/wiki/Transforming_growth_factor-beta" class="mw-redirect" title="Transforming growth factor-beta">transforming growth factor-beta</a> superfamily ligand, is a key gene involved in patterning both the anterior-posterior axis and the left-right axis of the early embryo. The <i>Nodal</i> gene contains two enhancers: the Proximal Epiblast Enhancer (PEE) and the Asymmetric Enhancer (ASE). The PEE is upstream of the Nodal gene and drives <i>Nodal</i> expression in the portion of the <a href="/wiki/Primitive_streak" title="Primitive streak">primitive streak</a> that will differentiate into the node (also referred to as the <a href="/wiki/Primitive_node" title="Primitive node">primitive node</a>).<sup id="cite_ref-50" class="reference"><a href="#cite_note-50"><span class="cite-bracket">&#91;</span>50<span class="cite-bracket">&#93;</span></a></sup> The PEE turns on Nodal expression in response to a combination of Wnt signaling plus a second, unknown signal; thus, a member of the LEF/TCF transcription factor family likely binds to a TCF binding site in the cells in the node. Diffusion of Nodal away from the node forms a gradient which then patterns the extending anterior-posterior axis of the embryo.<sup id="cite_ref-51" class="reference"><a href="#cite_note-51"><span class="cite-bracket">&#91;</span>51<span class="cite-bracket">&#93;</span></a></sup> The ASE is an intronic enhancer bound by the <a href="/wiki/Fork_head_domain" title="Fork head domain">fork head domain</a> transcription factor Fox1. Early in development, Fox1-driven Nodal expression establishes the visceral endoderm. Later in development, Fox1 binding to the ASE drives <i>Nodal</i> expression on the left side of the lateral plate <a href="/wiki/Mesoderm" title="Mesoderm">mesoderm</a>, thus establishing left-right asymmetry necessary for asymmetric organ development in the mesoderm.<sup id="cite_ref-52" class="reference"><a href="#cite_note-52"><span class="cite-bracket">&#91;</span>52<span class="cite-bracket">&#93;</span></a></sup> </p><p>Establishing three <a href="/wiki/Germ_layers" class="mw-redirect" title="Germ layers">germ layers</a> during <a href="/wiki/Gastrulation" title="Gastrulation">gastrulation</a> is another critical step in animal development. Each of the three germ layers has unique patterns of gene expression that promote their differentiation and development. The <a href="/wiki/Endoderm" title="Endoderm">endoderm</a> is specified early in development by <i><a href="/wiki/Gata4" class="mw-redirect" title="Gata4">Gata4</a></i> expression, and Gata4 goes on to direct gut morphogenesis later. <i>Gata4</i> expression is controlled in the early embryo by an intronic enhancer that binds another forkhead domain transcription factor, FoxA2. Initially the enhancer drives broad gene expression throughout the embryo, but the expression quickly becomes restricted to the endoderm, suggesting that other repressors may be involved in its restriction. Late in development, the same enhancer restricts expression to the tissues that will become the stomach and pancreas. An additional enhancer is responsible for maintaining <i>Gata4</i> expression in the endoderm during the intermediate stages of gut development.<sup id="cite_ref-53" class="reference"><a href="#cite_note-53"><span class="cite-bracket">&#91;</span>53<span class="cite-bracket">&#93;</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Multiple_enhancers_promote_developmental_robustness">Multiple enhancers promote developmental robustness</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Enhancer_(genetics)&amp;action=edit&amp;section=11" title="Edit section: Multiple enhancers promote developmental robustness"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Some genes involved in critical developmental processes contain multiple enhancers of overlapping function. Secondary enhancers, or "shadow enhancers", may be found many kilobases away from the primary enhancer ("primary" usually refers to the first enhancer discovered, which is often closer to the gene it regulates). On its own, each enhancer drives nearly identical patterns of gene expression. Are the two enhancers truly redundant? Recent work has shown that multiple enhancers allow fruit flies to survive environmental perturbations, such as an increase in temperature. When raised at an elevated temperature, a single enhancer sometimes fails to drive the complete pattern of expression, whereas the presence of both enhancers permits normal gene expression.<sup id="cite_ref-54" class="reference"><a href="#cite_note-54"><span class="cite-bracket">&#91;</span>54<span class="cite-bracket">&#93;</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Evolution_of_developmental_mechanisms">Evolution of developmental mechanisms</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Enhancer_(genetics)&amp;action=edit&amp;section=12" title="Edit section: Evolution of developmental mechanisms"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>One theme of research in <a href="/wiki/Evolutionary_developmental_biology" title="Evolutionary developmental biology">evolutionary developmental biology</a> ("evo-devo") is investigating the role of enhancers and other cis-regulatory elements in producing morphological changes via developmental differences between species.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">&#91;<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (July 2011)">citation needed</span></a></i>&#93;</sup> </p> <div class="mw-heading mw-heading3"><h3 id="Stickleback_Pitx1">Stickleback <i>Pitx1</i></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Enhancer_(genetics)&amp;action=edit&amp;section=13" title="Edit section: Stickleback Pitx1"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Recent work has investigated the role of enhancers in morphological changes in threespine <a href="/wiki/Stickleback" title="Stickleback">stickleback</a> fish. Sticklebacks exist in both marine and freshwater environments, but sticklebacks in many freshwater populations have completely lost their pelvic fins (appendages homologous to the posterior limb of tetrapods).<br /> <i><a href="/wiki/Pitx1" class="mw-redirect" title="Pitx1">Pitx1</a></i> is a <a href="/wiki/Homeobox" title="Homeobox">homeobox</a> gene involved in posterior limb development in vertebrates. Preliminary genetic analyses indicated that changes in the expression of this gene were responsible for pelvic reduction in sticklebacks. Fish expressing only the freshwater <a href="/wiki/Allele" title="Allele">allele</a> of <i>Pitx1</i> do not have pelvic spines, whereas fish expressing a marine allele retain pelvic spines. A more thorough characterization showed that a 500 base pair enhancer sequence is responsible for turning on <i>Pitx1</i> expression in the posterior fin bud. This enhancer is located near a <a href="/wiki/Chromosomal_fragile_site" title="Chromosomal fragile site">chromosomal fragile site</a>—a sequence of DNA that is likely to be broken and thus more likely to be mutated as a result of imprecise <a href="/wiki/DNA_repair" title="DNA repair">DNA repair</a>. This fragile site has caused repeated, independent losses of the enhancer responsible for driving <i>Pitx1</i> expression in the pelvic spines in isolated freshwater population, and without this enhancer, freshwater fish fail to develop pelvic spines.<sup id="cite_ref-55" class="reference"><a href="#cite_note-55"><span class="cite-bracket">&#91;</span>55<span class="cite-bracket">&#93;</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="In_Drosophila_wing_pattern_evolution">In <i>Drosophila</i> wing pattern evolution</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Enhancer_(genetics)&amp;action=edit&amp;section=14" title="Edit section: In Drosophila wing pattern evolution"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Pigmentation patterns provide one of the most striking and easily scored differences between different species of animals. Pigmentation of the <i>Drosophila</i> wing has proven to be a particularly amenable system for studying the development of complex pigmentation phenotypes. The <i>Drosophila guttifera</i> wing has 12 dark pigmentation spots and 4 lighter gray intervein patches. Pigment spots arise from expression of the <i>yellow</i> gene, whose product produces black <a href="/wiki/Melanin" title="Melanin">melanin</a>. Recent work has shown that two enhancers in the <i>yellow</i> gene produce gene expression in precisely this pattern – the vein spot enhancer drives reporter gene expression in the 12 spots, and the intervein shade enhancer drives reporter expression in the 4 distinct patches. These two enhancers are responsive to the <a href="/wiki/Wnt_signaling_pathway" title="Wnt signaling pathway">Wnt signaling pathway</a>, which is activated by <i>wingless</i> expression at all of the pigmented locations. Thus, in the evolution of the complex pigmentation <a href="/wiki/Phenotype" title="Phenotype">phenotype</a>, the <i>yellow</i> pigment gene evolved enhancers responsive to the wingless signal and <i>wingless</i> expression evolved at new locations to produce novel wing patterns.<sup id="cite_ref-56" class="reference"><a href="#cite_note-56"><span class="cite-bracket">&#91;</span>56<span class="cite-bracket">&#93;</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="In_inflammation_and_cancer">In inflammation and cancer</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Enhancer_(genetics)&amp;action=edit&amp;section=15" title="Edit section: In inflammation and cancer"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Each cell typically contains several hundred of a special class of enhancers that stretch over many kilobases long DNA sequences, called "<a href="/wiki/Super-enhancer" title="Super-enhancer">super-enhancers</a>".<sup id="cite_ref-57" class="reference"><a href="#cite_note-57"><span class="cite-bracket">&#91;</span>57<span class="cite-bracket">&#93;</span></a></sup> These enhancers contain a large number of binding sites for sequence-specific, inducible transcription factors, and regulate expression of genes involved in cell differentiation.<sup id="cite_ref-58" class="reference"><a href="#cite_note-58"><span class="cite-bracket">&#91;</span>58<span class="cite-bracket">&#93;</span></a></sup> During <a href="/wiki/Inflammation" title="Inflammation">inflammation</a>, the transcription factor <a href="/wiki/NF-%CE%BAB" title="NF-κB">NF-κB</a> facilitates remodeling of chromatin in a manner that selectively redistributes cofactors from high-occupancy enhancers, thereby repressing genes involved in maintaining cellular identify whose expression they enhance; at the same time, this F-κB-driven remodeling and redistribution activates other enhancers that guide changes in cellular function through inflammation.<sup id="cite_ref-59" class="reference"><a href="#cite_note-59"><span class="cite-bracket">&#91;</span>59<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-60" class="reference"><a href="#cite_note-60"><span class="cite-bracket">&#91;</span>60<span class="cite-bracket">&#93;</span></a></sup> As a result, inflammation reprograms cells, altering their interactions with the rest of tissue and with the immune system.<sup id="cite_ref-61" class="reference"><a href="#cite_note-61"><span class="cite-bracket">&#91;</span>61<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-62" class="reference"><a href="#cite_note-62"><span class="cite-bracket">&#91;</span>62<span class="cite-bracket">&#93;</span></a></sup> In cancer, proteins that control NF-κB activity are dysregulated, permitting <a href="/wiki/Malignant_cell" class="mw-redirect" title="Malignant cell">malignant cells</a> to decrease their dependence on interactions with local tissue, and hindering their <a href="/wiki/Immune_surveillance" class="mw-redirect" title="Immune surveillance">surveillance by the immune system</a>.<sup id="cite_ref-63" class="reference"><a href="#cite_note-63"><span class="cite-bracket">&#91;</span>63<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-64" class="reference"><a href="#cite_note-64"><span class="cite-bracket">&#91;</span>64<span class="cite-bracket">&#93;</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Designing_enhancers_in_synthetic_biology">Designing enhancers in synthetic biology</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Enhancer_(genetics)&amp;action=edit&amp;section=16" title="Edit section: Designing enhancers in synthetic biology"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Synthetic regulatory elements such as enhancers promise to be a powerful tool to direct gene products to particular cell types in order to treat disease by activating beneficial genes or by halting aberrant cell states. </p><p>Since 2022, <a href="/wiki/Artificial_intelligence" title="Artificial intelligence">artificial intelligence</a> and <a href="/wiki/Transfer_learning" title="Transfer learning">transfer learning</a> strategies have led to a better understanding of the features of regulatory DNA sequences, the prediction, and the design of synthetic enhancers.<sup id="cite_ref-DeepSTARR_predicts_enhancer_activit_65-0" class="reference"><a href="#cite_note-DeepSTARR_predicts_enhancer_activit-65"><span class="cite-bracket">&#91;</span>65<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-66" class="reference"><a href="#cite_note-66"><span class="cite-bracket">&#91;</span>66<span class="cite-bracket">&#93;</span></a></sup> </p><p>Building on work in cell culture,<sup id="cite_ref-DeepSTARR_predicts_enhancer_activit_65-1" class="reference"><a href="#cite_note-DeepSTARR_predicts_enhancer_activit-65"><span class="cite-bracket">&#91;</span>65<span class="cite-bracket">&#93;</span></a></sup> synthetic enhancers were successfully applied to entire living organisms in 2023. Using <a href="/wiki/Deep_learning" title="Deep learning">deep neural networks</a>, scientists simulated the evolution of DNA sequences to analyze the emergence of features that underly enhancer function. This allowed the design and production of a range of functioning synthetic enhancers for different cell types of the fruit fly brain.<sup id="cite_ref-pmid38086419_13-1" class="reference"><a href="#cite_note-pmid38086419-13"><span class="cite-bracket">&#91;</span>13<span class="cite-bracket">&#93;</span></a></sup> A second approach trained artificial intelligence models on single-cell DNA accessibility data and transferred the learned models towards the prediction of enhancers for selected tissues in the fruit fly embryo. These enhancer prediction models were used to design synthetic enhancers for the nervous system, brain, muscle, epidermis and gut.<sup id="cite_ref-pmid38086418_12-1" class="reference"><a href="#cite_note-pmid38086418-12"><span class="cite-bracket">&#91;</span>12<span class="cite-bracket">&#93;</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Enhancer_(genetics)&amp;action=edit&amp;section=17" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Shadow_enhancer" title="Shadow enhancer">Shadow enhancers</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Enhancer_(genetics)&amp;action=edit&amp;section=18" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <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-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</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="CITEREFBlackwoodKadonaga1998" class="citation journal cs1">Blackwood EM, Kadonaga JT (July 1998). "Going the distance: a current view of enhancer action". <i>Science</i>. <b>281</b> (5373): 60–63. <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/1998Sci...281...60.">1998Sci...281...60.</a>. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1126%2Fscience.281.5373.60">10.1126/science.281.5373.60</a>. <a href="/wiki/PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a>&#160;<a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/9679020">9679020</a>. <a href="/wiki/S2CID_(identifier)" class="mw-redirect" title="S2CID (identifier)">S2CID</a>&#160;<a rel="nofollow" class="external text" href="https://api.semanticscholar.org/CorpusID:11666739">11666739</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=Science&amp;rft.atitle=Going+the+distance%3A+a+current+view+of+enhancer+action&amp;rft.volume=281&amp;rft.issue=5373&amp;rft.pages=60-63&amp;rft.date=1998-07&amp;rft_id=info%3Adoi%2F10.1126%2Fscience.281.5373.60&amp;rft_id=https%3A%2F%2Fapi.semanticscholar.org%2FCorpusID%3A11666739%23id-name%3DS2CID&amp;rft_id=info%3Apmid%2F9679020&amp;rft_id=info%3Abibcode%2F1998Sci...281...60.&amp;rft.aulast=Blackwood&amp;rft.aufirst=EM&amp;rft.au=Kadonaga%2C+JT&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3AEnhancer+%28genetics%29" class="Z3988"></span></span> </li> <li id="cite_note-5questions-2"><span class="mw-cite-backlink">^ <a href="#cite_ref-5questions_2-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-5questions_2-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-5questions_2-2"><sup><i><b>c</b></i></sup></a> <a href="#cite_ref-5questions_2-3"><sup><i><b>d</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFPennacchioBickmoreDeanNobrega2013" class="citation journal cs1">Pennacchio LA, Bickmore W, Dean A, Nobrega MA, Bejerano G (April 2013). <a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4445073">"Enhancers: five essential questions"</a>. <i>Nature Reviews. 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href="https://api.semanticscholar.org/CorpusID:12346247">12346247</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=Annual+Review+of+Genomics+and+Human+Genetics&amp;rft.atitle=Transcriptional+regulatory+elements+in+the+human+genome&amp;rft.volume=7&amp;rft.pages=29-59&amp;rft.date=2006&amp;rft_id=https%3A%2F%2Fapi.semanticscholar.org%2FCorpusID%3A12346247%23id-name%3DS2CID&amp;rft_id=info%3Apmid%2F16719718&amp;rft_id=info%3Adoi%2F10.1146%2Fannurev.genom.7.080505.115623&amp;rft.aulast=Maston&amp;rft.aufirst=GA&amp;rft.au=Evans%2C+SK&amp;rft.au=Green%2C+MR&amp;rft_id=https%3A%2F%2Fdoi.org%2F10.1146%252Fannurev.genom.7.080505.115623&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3AEnhancer+%28genetics%29" class="Z3988"></span></span> </li> <li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" 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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=Nature+Genetics&amp;rft.atitle=Base-resolution+models+of+transcription-factor+binding+reveal+soft+motif+syntax&amp;rft.volume=53&amp;rft.issue=3&amp;rft.pages=354-366&amp;rft.date=2021-03&amp;rft_id=https%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fpmc%2Farticles%2FPMC8812996%23id-name%3DPMC&amp;rft_id=info%3Apmid%2F33603233&amp;rft_id=info%3Adoi%2F10.1038%2Fs41588-021-00782-6&amp;rft.aulast=Avsec&amp;rft.aufirst=%C5%BD&amp;rft.au=Weilert%2C+M&amp;rft.au=Shrikumar%2C+A&amp;rft.au=Krueger%2C+S&amp;rft.au=Alexandari%2C+A&amp;rft.au=Dalal%2C+K&amp;rft.au=Fropf%2C+R&amp;rft.au=McAnany%2C+C&amp;rft.au=Gagneur%2C+J&amp;rft.au=Kundaje%2C+A&amp;rft.au=Zeitlinger%2C+J&amp;rft_id=https%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fpmc%2Farticles%2FPMC8812996&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3AEnhancer+%28genetics%29" class="Z3988"></span></span> </li> </ol></div></div> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Enhancer_(genetics)&amp;action=edit&amp;section=19" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a rel="nofollow" class="external text" href="https://meshb.nlm.nih.gov/record/ui?name=Enhancer+Elements%2CGenetic">Enhancer+Elements,Genetic</a> at the U.S. National Library of Medicine <a href="/wiki/Medical_Subject_Headings" title="Medical Subject Headings">Medical Subject Headings</a> (MeSH)</li> <li><a rel="nofollow" class="external text" href="http://www.cbrc.jp/research/db/TFSEARCH.html">TFSEARCH</a></li> <li><a rel="nofollow" class="external text" href="http://jaspar.genereg.net/">JASPAR</a></li> <li><a rel="nofollow" class="external text" href="https://remap.univ-amu.fr//">ReMap</a></li> <li><a rel="nofollow" class="external text" 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mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><style data-mw-deduplicate="TemplateStyles:r1239400231">.mw-parser-output .navbar{display:inline;font-size:88%;font-weight:normal}.mw-parser-output .navbar-collapse{float:left;text-align:left}.mw-parser-output .navbar-boxtext{word-spacing:0}.mw-parser-output .navbar ul{display:inline-block;white-space:nowrap;line-height:inherit}.mw-parser-output .navbar-brackets::before{margin-right:-0.125em;content:"[ "}.mw-parser-output .navbar-brackets::after{margin-left:-0.125em;content:" ]"}.mw-parser-output .navbar li{word-spacing:-0.125em}.mw-parser-output .navbar a>span,.mw-parser-output .navbar a>abbr{text-decoration:inherit}.mw-parser-output .navbar-mini abbr{font-variant:small-caps;border-bottom:none;text-decoration:none;cursor:inherit}.mw-parser-output .navbar-ct-full{font-size:114%;margin:0 7em}.mw-parser-output .navbar-ct-mini{font-size:114%;margin:0 4em}html.skin-theme-clientpref-night .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}@media(prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}}@media print{.mw-parser-output .navbar{display:none!important}}</style><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Transcription" title="Template:Transcription"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Transcription" title="Template talk:Transcription"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Transcription" title="Special:EditPage/Template:Transcription"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Transcription_(Bacterial,_Eukaryotic)" style="font-size:114%;margin:0 4em"><a href="/wiki/Transcription_(genetics)" class="mw-redirect" title="Transcription (genetics)">Transcription</a> (<a href="/wiki/Bacterial_transcription" title="Bacterial transcription">Bacterial</a>, <a href="/wiki/Eukaryotic_transcription" title="Eukaryotic transcription">Eukaryotic</a>)</div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Transcriptional_regulation" title="Transcriptional regulation">Transcriptional regulation</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">prokaryotic</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Operon" title="Operon">Operon</a> <ul><li><a href="/wiki/Lac_operon" title="Lac operon">lac operon</a></li> <li><a href="/wiki/Trp_operon" title="Trp operon">trp operon</a></li> <li><a href="/wiki/Gab_operon" title="Gab operon">gab operon</a></li> <li><a href="/wiki/Gua_Operon" title="Gua Operon">Gua Operon</a></li> <li><a href="/wiki/L-arabinose_operon" title="L-arabinose operon">ara operon</a></li> <li><a href="/wiki/Gal_operon" title="Gal operon">gal operon</a></li></ul></li> <li><a href="/wiki/Repressor" title="Repressor">Repressor</a> <ul><li><a href="/wiki/Lac_repressor" title="Lac repressor">lac repressor</a></li> <li><a href="/wiki/Tryptophan_repressor" title="Tryptophan repressor">trp repressor</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">eukaryotic</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Histone-modifying_enzymes" title="Histone-modifying enzymes">Histone-modifying enzymes</a><br />(<a href="/wiki/Histone" title="Histone">histone</a>/<a href="/wiki/Nucleosome" title="Nucleosome">nucleosome</a>):</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Histone_methylation" title="Histone methylation">Histone methylation</a>/<a href="/wiki/Histone_methyltransferase" title="Histone methyltransferase">Histone methyltransferase</a> <ul><li><a href="/wiki/EZH2" title="EZH2">EZH2</a></li></ul></li> <li><a href="/wiki/Demethylase" title="Demethylase">Histone demethylase</a></li> <li><a href="/wiki/Histone_acetylation_and_deacetylation" title="Histone acetylation and deacetylation">Histone acetylation and deacetylation</a> <ul><li><a href="/wiki/Histone_deacetylase" title="Histone deacetylase">Histone deacetylase</a> <a href="/wiki/HDAC1" title="HDAC1">HDAC1</a></li> <li><a href="/wiki/Histone_acetyltransferase" title="Histone acetyltransferase">Histone acetyltransferase</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/DNA_methylation" title="DNA methylation">DNA methylation</a>:</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><ul><li><a href="/wiki/DNA_methyltransferase" title="DNA methyltransferase">DNA methyltransferase</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Chromatin_remodeling" title="Chromatin remodeling">Chromatin remodeling</a>:</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/CHD7" title="CHD7">CHD7</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">both</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Transcription_coregulator" title="Transcription coregulator">Transcription coregulator</a> <ul><li><a href="/wiki/Activator_(genetics)" title="Activator (genetics)">Activator</a></li> <li><a href="/wiki/Coactivator_(genetics)" title="Coactivator (genetics)">Coactivator</a></li> <li><a href="/wiki/Corepressor" title="Corepressor">Corepressor</a></li></ul></li> <li><a href="/wiki/Inducer" title="Inducer">Inducer</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Promotion</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Promoter_(genetics)" title="Promoter (genetics)">Promoter</a> <ul><li><a href="/wiki/Pribnow_box" title="Pribnow box">Pribnow box</a></li> <li><a href="/wiki/TATA_box" title="TATA box">TATA box</a></li> <li><a href="/wiki/B_recognition_element" title="B recognition element">BRE</a></li> <li><a href="/wiki/CAAT_box" title="CAAT box">CAAT box</a></li> <li><a href="/wiki/Response_element" title="Response element">Response element</a></li></ul></li> <li><a class="mw-selflink selflink">Enhancer</a> <ul><li><a href="/wiki/E-box" title="E-box">E-box</a></li> <li><a href="/wiki/Response_element" title="Response element">Response element</a></li></ul></li> <li><a href="/wiki/Insulator_(genetics)" title="Insulator (genetics)">Insulator</a></li> <li><a href="/wiki/Silencer_(DNA)" class="mw-redirect" title="Silencer (DNA)">Silencer</a></li> <li><a href="/wiki/Internal_control_region" title="Internal control region">Internal control region</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Initiation</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Bacterial_transcription#Initiation" title="Bacterial transcription">Bacterial</a></li> <li><a href="/wiki/Eukaryotic_transcription#Initiation" title="Eukaryotic transcription">Eukaryotic</a></li> <li><a href="/wiki/Archaeal_transcription_factor_B" title="Archaeal transcription factor B">Archaeal transcription factor B</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Elongation</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Bacterial_transcription#Elongation" title="Bacterial transcription">bacterial</a> <a href="/wiki/RNA_polymerase" title="RNA polymerase">RNA polymerase</a>: <a href="/wiki/RpoB" title="RpoB">rpoB</a></li> <li><a href="/wiki/Eukaryotic_transcription#Transcription_process" title="Eukaryotic transcription">eukaryotic</a> <a href="/wiki/RNA_polymerase" title="RNA polymerase">RNA polymerase</a>: <a href="/wiki/RNA_polymerase_II" title="RNA polymerase II">RNA polymerase II</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Termination<br />(<a href="/wiki/Bacterial_transcription#Termination" title="Bacterial transcription">bacterial</a>,<br /> <a href="/wiki/Eukaryotic_transcription#Termination" title="Eukaryotic transcription">eukaryotic</a>)</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Terminator_(genetics)" title="Terminator (genetics)">Terminator</a></li> <li><a href="/wiki/Intrinsic_termination" title="Intrinsic termination">Intrinsic termination</a></li> <li><a href="/wiki/Rho_factor" title="Rho factor">Rho factor</a></li></ul> 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