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Nucleic acid sequence - Wikipedia
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aria-controls="toc-Sequence_determination-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 Sequence determination subsection</span> </button> <ul id="toc-Sequence_determination-sublist" class="vector-toc-list"> <li id="toc-Digital_representation" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Digital_representation"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.1</span> <span>Digital representation</span> </div> </a> <ul id="toc-Digital_representation-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Sequence_analysis" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Sequence_analysis"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Sequence analysis</span> </div> </a> <button 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class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Sequence_motifs"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.3</span> <span>Sequence motifs</span> </div> </a> <ul id="toc-Sequence_motifs-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Sequence_entropy" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Sequence_entropy"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.4</span> <span>Sequence entropy</span> </div> </a> <ul id="toc-Sequence_entropy-sublist" class="vector-toc-list"> </ul> </li> </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">5</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">6</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">7</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 " aria-label="Toggle the table of contents" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Toggle the table of contents</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Nucleic acid sequence</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Go to an article in another language. Available in 35 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-35" 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">35 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/%D8%AA%D8%B3%D9%84%D8%B3%D9%84_%D8%A7%D9%84%D8%AD%D9%85%D8%B6_%D8%A7%D9%84%D9%86%D9%88%D9%88%D9%8A" title="تسلسل الحمض النووي – Arabic" lang="ar" hreflang="ar" data-title="تسلسل الحمض النووي" data-language-autonym="العربية" data-language-local-name="Arabic" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-ast mw-list-item"><a href="https://ast.wikipedia.org/wiki/Secuencia_d%27ADN" title="Secuencia d'ADN – Asturian" lang="ast" hreflang="ast" data-title="Secuencia d'ADN" data-language-autonym="Asturianu" data-language-local-name="Asturian" class="interlanguage-link-target"><span>Asturianu</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%94%D0%9D%D0%9A_%D1%81%D0%B5%D0%BA%D0%B2%D0%B5%D0%BD%D1%86%D0%B8%D1%8F" title="ДНК секвенция – Bulgarian" lang="bg" hreflang="bg" data-title="ДНК секвенция" data-language-autonym="Български" data-language-local-name="Bulgarian" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-bs mw-list-item"><a href="https://bs.wikipedia.org/wiki/Sekvenca_nukleinskih_kiselina" title="Sekvenca nukleinskih kiselina – Bosnian" lang="bs" hreflang="bs" data-title="Sekvenca nukleinskih kiselina" data-language-autonym="Bosanski" data-language-local-name="Bosnian" class="interlanguage-link-target"><span>Bosanski</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Seq%C3%BC%C3%A8ncia_de_nucle%C3%B2tids" title="Seqüència de nucleòtids – Catalan" lang="ca" hreflang="ca" data-title="Seqüència de nucleòtids" 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/Sekvence_nukleov%C3%A9_kyseliny" title="Sekvence nukleové kyseliny – Czech" lang="cs" hreflang="cs" data-title="Sekvence nukleové kyseliny" 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/Nukleotidsequenz" title="Nukleotidsequenz – German" lang="de" hreflang="de" data-title="Nukleotidsequenz" 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%91%CE%BB%CE%BB%CE%B7%CE%BB%CE%BF%CF%85%CF%87%CE%AF%CE%B1_%CE%BD%CE%BF%CF%85%CE%BA%CE%BB%CE%B5%CF%8A%CE%BA%CF%8E%CE%BD_%CE%BF%CE%BE%CE%AD%CF%89%CE%BD" title="Αλληλουχία νουκλεϊκών οξέων – Greek" lang="el" hreflang="el" data-title="Αλληλουχία νουκλεϊκών οξέων" 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/Secuencia_de_ADN" title="Secuencia de ADN – Spanish" lang="es" hreflang="es" data-title="Secuencia de ADN" 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%AA%D9%88%D8%A7%D9%84%DB%8C_%D8%A7%D8%B3%DB%8C%D8%AF_%D9%86%D9%88%DA%A9%D9%84%D8%A6%DB%8C%DA%A9" title="توالی اسید نوکلئیک – Persian" lang="fa" hreflang="fa" data-title="توالی اسید نوکلئیک" 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/S%C3%A9quence_(acide_nucl%C3%A9ique)" title="Séquence (acide nucléique) – French" lang="fr" hreflang="fr" data-title="Séquence (acide nucléique)" 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/Seicheamh_aig%C3%A9id_n%C3%BAicl%C3%A9asaigh" title="Seicheamh aigéid núicléasaigh – Irish" lang="ga" hreflang="ga" data-title="Seicheamh aigéid núicléasaigh" 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/Estrutura_primaria_dos_%C3%A1cidos_nucleicos" title="Estrutura primaria dos ácidos nucleicos – Galician" lang="gl" hreflang="gl" data-title="Estrutura primaria dos ácidos nucleicos" data-language-autonym="Galego" data-language-local-name="Galician" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EC%97%BC%EA%B8%B0%EC%84%9C%EC%97%B4" title="염기서열 – Korean" lang="ko" hreflang="ko" data-title="염기서열" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Urutan_asam_nukleat" title="Urutan asam nukleat – Indonesian" lang="id" hreflang="id" data-title="Urutan asam nukleat" 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/Sequenza_di_DNA" title="Sequenza di DNA – Italian" lang="it" hreflang="it" data-title="Sequenza di DNA" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-kk mw-list-item"><a href="https://kk.wikipedia.org/wiki/%D0%9D%D1%83%D0%BA%D0%BB%D0%B5%D0%B8%D0%BD_%D2%9B%D1%8B%D1%88%D2%9B%D1%8B%D0%BB%D1%8B_%D1%82%D1%96%D0%B7%D0%B1%D0%B5%D0%B3%D1%96" title="Нуклеин қышқылы тізбегі – Kazakh" lang="kk" hreflang="kk" data-title="Нуклеин қышқылы тізбегі" data-language-autonym="Қазақша" data-language-local-name="Kazakh" class="interlanguage-link-target"><span>Қазақша</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/%D0%9D%D1%83%D0%BA%D0%BB%D0%B5%D0%BE%D1%82%D0%B8%D0%B4%D0%BD%D0%B0_%D0%BD%D0%B8%D0%B7%D0%B0" title="Нуклеотидна низа – Macedonian" lang="mk" hreflang="mk" data-title="Нуклеотидна низа" data-language-autonym="Македонски" data-language-local-name="Macedonian" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Jujukan_asid_nukleik" title="Jujukan asid nukleik – Malay" lang="ms" hreflang="ms" data-title="Jujukan asid nukleik" data-language-autonym="Bahasa Melayu" data-language-local-name="Malay" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-mn badge-Q70893996 mw-list-item" title=""><a href="https://mn.wikipedia.org/wiki/%D0%94%D0%9D%D0%A5_%D0%B4%D0%B0%D1%80%D0%B0%D0%B0%D0%BB%D0%B0%D0%BB_%D1%82%D0%BE%D0%B3%D1%82%D0%BE%D0%BE%D1%85" title="ДНХ дараалал тогтоох – Mongolian" lang="mn" hreflang="mn" data-title="ДНХ дараалал тогтоох" data-language-autonym="Монгол" data-language-local-name="Mongolian" class="interlanguage-link-target"><span>Монгол</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Nucleotidesequentie" title="Nucleotidesequentie – Dutch" lang="nl" hreflang="nl" data-title="Nucleotidesequentie" 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/%E5%A1%A9%E5%9F%BA%E9%85%8D%E5%88%97" title="塩基配列 – Japanese" lang="ja" hreflang="ja" data-title="塩基配列" 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/DNA-sekvens" title="DNA-sekvens – Norwegian Bokmål" lang="nb" hreflang="nb" data-title="DNA-sekvens" 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/Sekwencja_nukleotyd%C3%B3w" title="Sekwencja nukleotydów – Polish" lang="pl" hreflang="pl" data-title="Sekwencja nukleotydów" 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/Sequ%C3%AAncia_de_ADN" title="Sequência de ADN – Portuguese" lang="pt" hreflang="pt" data-title="Sequência de ADN" 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%9D%D1%83%D0%BA%D0%BB%D0%B5%D0%BE%D1%82%D0%B8%D0%B4%D0%BD%D0%B0%D1%8F_%D0%BF%D0%BE%D1%81%D0%BB%D0%B5%D0%B4%D0%BE%D0%B2%D0%B0%D1%82%D0%B5%D0%BB%D1%8C%D0%BD%D0%BE%D1%81%D1%82%D1%8C" title="Нуклеотидная последовательность – Russian" lang="ru" hreflang="ru" data-title="Нуклеотидная последовательность" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/Genetick%C3%A1_inform%C3%A1cia" title="Genetická informácia – Slovak" lang="sk" hreflang="sk" data-title="Genetická informácia" data-language-autonym="Slovenčina" data-language-local-name="Slovak" class="interlanguage-link-target"><span>Slovenčina</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/Sekvenca_nukleinskih_kiselina" title="Sekvenca nukleinskih kiselina – Serbian" lang="sr" hreflang="sr" data-title="Sekvenca nukleinskih kiselina" 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/Sekvenca_nukleinskih_kiselina" title="Sekvenca nukleinskih kiselina – Serbo-Croatian" lang="sh" hreflang="sh" data-title="Sekvenca nukleinskih kiselina" 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-kab mw-list-item"><a href="https://kab.wikipedia.org/wiki/Alkem_n_uzeffar_imi%C9%A3es" title="Alkem n uzeffar imiɣes – Kabyle" lang="kab" hreflang="kab" data-title="Alkem n uzeffar imiɣes" data-language-autonym="Taqbaylit" data-language-local-name="Kabyle" class="interlanguage-link-target"><span>Taqbaylit</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/%E0%B8%A5%E0%B8%B3%E0%B8%94%E0%B8%B1%E0%B8%9A%E0%B8%94%E0%B8%B5%E0%B9%80%E0%B8%AD%E0%B9%87%E0%B8%99%E0%B9%80%E0%B8%AD" title="ลำดับดีเอ็นเอ – Thai" lang="th" hreflang="th" data-title="ลำดับดีเอ็นเอ" data-language-autonym="ไทย" data-language-local-name="Thai" class="interlanguage-link-target"><span>ไทย</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/DNA_dizisi" title="DNA dizisi – Turkish" lang="tr" hreflang="tr" data-title="DNA dizisi" 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%9D%D1%83%D0%BA%D0%BB%D0%B5%D0%BE%D1%82%D0%B8%D0%B4%D0%BD%D0%B0_%D0%BF%D0%BE%D1%81%D0%BB%D1%96%D0%B4%D0%BE%D0%B2%D0%BD%D1%96%D1%81%D1%82%D1%8C" title="Нуклеотидна послідовність – Ukrainian" lang="uk" hreflang="uk" data-title="Нуклеотидна послідовність" 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_acid_nucleic" title="Trình tự acid nucleic – Vietnamese" lang="vi" hreflang="vi" data-title="Trình tự acid nucleic" 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/%E6%A0%B8%E9%85%B8%E5%BA%8F%E5%88%97" title="核酸序列 – Chinese" lang="zh" hreflang="zh" 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data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">From Wikipedia, the free encyclopedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"><span class="mw-redirectedfrom">(Redirected from <a href="/w/index.php?title=DNA_sequences&redirect=no" class="mw-redirect" title="DNA sequences">DNA sequences</a>)</span></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">Succession of nucleotides in a nucleic acid</div> <style data-mw-deduplicate="TemplateStyles:r1251242444">.mw-parser-output .ambox{border:1px solid #a2a9b1;border-left:10px solid #36c;background-color:#fbfbfb;box-sizing:border-box}.mw-parser-output .ambox+link+.ambox,.mw-parser-output .ambox+link+style+.ambox,.mw-parser-output .ambox+link+link+.ambox,.mw-parser-output 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data-file-height="399" /></a></span></div></td><td class="mbox-text"><div class="mbox-text-span">This article <b>needs additional citations for <a href="/wiki/Wikipedia:Verifiability" title="Wikipedia:Verifiability">verification</a></b>.<span class="hide-when-compact"> Please help <a href="/wiki/Special:EditPage/Nucleic_acid_sequence" title="Special:EditPage/Nucleic acid sequence">improve this article</a> by <a href="/wiki/Help:Referencing_for_beginners" title="Help:Referencing for beginners">adding citations to reliable sources</a>. Unsourced material may be challenged and removed.<br /><small><span class="plainlinks"><i>Find sources:</i> <a rel="nofollow" class="external text" href="https://www.google.com/search?as_eq=wikipedia&q=%22Nucleic+acid+sequence%22">"Nucleic acid sequence"</a> – <a rel="nofollow" class="external text" href="https://www.google.com/search?tbm=nws&q=%22Nucleic+acid+sequence%22+-wikipedia&tbs=ar:1">news</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.google.com/search?&q=%22Nucleic+acid+sequence%22&tbs=bkt:s&tbm=bks">newspapers</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.google.com/search?tbs=bks:1&q=%22Nucleic+acid+sequence%22+-wikipedia">books</a> <b>·</b> <a rel="nofollow" class="external text" href="https://scholar.google.com/scholar?q=%22Nucleic+acid+sequence%22">scholar</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.jstor.org/action/doBasicSearch?Query=%22Nucleic+acid+sequence%22&acc=on&wc=on">JSTOR</a></span></small></span> <span class="date-container"><i>(<span class="date">March 2014</span>)</i></span><span class="hide-when-compact"><i> (<small><a href="/wiki/Help:Maintenance_template_removal" title="Help:Maintenance template removal">Learn how and when to remove this message</a></small>)</i></span></div></td></tr></tbody></table> <figure class="noresize" typeof="mw:File/Thumb"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/8/8e/DNA_RNA_structure_%281%29.png/270px-DNA_RNA_structure_%281%29.png" decoding="async" width="270" height="429" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/8e/DNA_RNA_structure_%281%29.png/405px-DNA_RNA_structure_%281%29.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/8e/DNA_RNA_structure_%281%29.png/540px-DNA_RNA_structure_%281%29.png 2x" data-file-width="1253" data-file-height="1989" usemap="#ImageMap_6e2e5d521dd55d5b" resource="/wiki/File:DNA_RNA_structure_(1).png" /></span><map name="ImageMap_6e2e5d521dd55d5b"><area href="/wiki/Nucleic_acid_primary_structure" shape="rect" coords="0,0,270,58" alt="Nucleic acid primary structure" title="Nucleic acid primary structure" /><area href="/wiki/Nucleic_acid_secondary_structure" shape="rect" coords="0,65,270,123" alt="Nucleic acid secondary structure" title="Nucleic acid secondary structure" /><area href="/wiki/Nucleic_acid_tertiary_structure" shape="rect" coords="0,128,270,247" alt="Nucleic acid tertiary structure" title="Nucleic acid tertiary structure" /><area href="/wiki/Nucleic_acid_quaternary_structure" shape="rect" coords="0,253,270,429" alt="Nucleic acid quaternary structure" title="Nucleic acid quaternary structure" /></map><figcaption><figure class="mw-halign-left" typeof="mw:File"><span title="The image above contains clickable links"><img alt="The image above contains clickable links" src="//upload.wikimedia.org/wikipedia/commons/thumb/e/e6/Interactive_icon.svg/18px-Interactive_icon.svg.png" decoding="async" width="18" height="27" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/e6/Interactive_icon.svg/27px-Interactive_icon.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/e6/Interactive_icon.svg/36px-Interactive_icon.svg.png 2x" data-file-width="133" data-file-height="200" /></span><figcaption>The image above contains clickable links</figcaption></figure> <i>Interactive image</i> of <a href="/wiki/Nucleic_acid_structure" title="Nucleic acid structure">nucleic acid structure</a> (primary, secondary, tertiary, and quaternary) using <a href="/wiki/Nucleic_acid_double_helix" title="Nucleic acid double helix">DNA helices</a> and examples from the <a href="/wiki/VS_ribozyme" title="VS ribozyme">VS ribozyme</a> and <a href="/wiki/Telomerase" title="Telomerase">telomerase</a> and <a href="/wiki/Nucleosome" title="Nucleosome">nucleosome</a>. (<span class="plainlinks"><a href="/wiki/Protein_Data_Bank" title="Protein Data Bank">PDB</a>: <a rel="nofollow" class="external text" href="https://www.rcsb.org/structure/ADNA">ADNA</a>, <a rel="nofollow" class="external text" href="https://www.rcsb.org/structure/1BNA">1BNA</a>, <a rel="nofollow" class="external text" href="https://www.rcsb.org/structure/4OCB">4OCB</a>, <a rel="nofollow" class="external text" href="https://www.rcsb.org/structure/4R4V">4R4V</a>, <a rel="nofollow" class="external text" href="https://www.rcsb.org/structure/1YMO">1YMO</a>, <a rel="nofollow" class="external text" href="https://www.rcsb.org/structure/1EQZ">1EQZ</a></span>)</figcaption></figure> <p>A <b>nucleic acid sequence</b> is a succession of <a href="/wiki/Nucleobase" class="mw-redirect" title="Nucleobase">bases</a> within the <a href="/wiki/Nucleotides" class="mw-redirect" title="Nucleotides">nucleotides</a> forming <a href="/wiki/Allele" title="Allele">alleles</a> within a <a href="/wiki/DNA" title="DNA">DNA</a> (using GACT) or <a href="/wiki/RNA" title="RNA">RNA</a> (GACU) molecule. This succession is denoted by a series of a set of five different letters that indicate the order of the nucleotides. By convention, sequences are usually presented from the <a href="/wiki/Directionality_(molecular_biology)" title="Directionality (molecular biology)">5' end to the 3' end</a>. For DNA, with its double helix, there are two possible directions for the notated sequence; of these two, the <a href="/wiki/Sense_(molecular_biology)" title="Sense (molecular biology)">sense strand</a> is used. Because nucleic acids are normally linear (unbranched) <a href="/wiki/Polymers" class="mw-redirect" title="Polymers">polymers</a>, specifying the sequence is equivalent to defining the <a href="/wiki/Covalent" class="mw-redirect" title="Covalent">covalent</a> structure of the entire molecule. For this reason, the nucleic acid sequence is also termed the <a href="/wiki/Biomolecular_structure#Primary_structure" title="Biomolecular structure">primary structure</a>. </p><p>The sequence represents <b>genetic information</b>. Biological <a href="/wiki/Deoxyribonucleic_acid" class="mw-redirect" title="Deoxyribonucleic acid">deoxyribonucleic acid</a> represents the <a href="/wiki/Information" title="Information">information</a> which directs the functions of an <a href="/wiki/Organism" title="Organism">organism</a>. </p><p>Nucleic acids also have a <a href="/wiki/Nucleic_acid_secondary_structure" title="Nucleic acid secondary structure">secondary structure</a> and <a href="/wiki/Nucleic_acid_tertiary_structure" title="Nucleic acid tertiary structure">tertiary structure</a>. Primary structure is sometimes mistakenly referred to as "primary sequence". However there is no parallel concept of secondary or tertiary sequence. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Nucleotides">Nucleotides</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Nucleic_acid_sequence&action=edit&section=1" title="Edit section: Nucleotides"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:RNA_chemical_structure.GIF" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/2/2c/RNA_chemical_structure.GIF/220px-RNA_chemical_structure.GIF" decoding="async" width="220" height="216" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/2c/RNA_chemical_structure.GIF/330px-RNA_chemical_structure.GIF 1.5x, //upload.wikimedia.org/wikipedia/commons/2/2c/RNA_chemical_structure.GIF 2x" data-file-width="428" data-file-height="420" /></a><figcaption>Chemical structure of RNA</figcaption></figure> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:RNA-codons.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/c/ce/RNA-codons.svg/220px-RNA-codons.svg.png" decoding="async" width="220" height="311" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/ce/RNA-codons.svg/330px-RNA-codons.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/ce/RNA-codons.svg/440px-RNA-codons.svg.png 2x" data-file-width="744" data-file-height="1052" /></a><figcaption>A series of codons in part of a <a href="/wiki/MRNA" class="mw-redirect" title="MRNA">mRNA</a> molecule. Each codon consists of three <a href="/wiki/Nucleotide" title="Nucleotide">nucleotides</a>, usually representing a single <a href="/wiki/Amino_acid" title="Amino acid">amino acid</a>.</figcaption></figure> <style data-mw-deduplicate="TemplateStyles:r1236090951">.mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Nucleotide" title="Nucleotide">Nucleotide</a></div> <p>Nucleic acids consist of a chain of linked units called nucleotides. Each nucleotide consists of three subunits: a <a href="/wiki/Phosphate" title="Phosphate">phosphate</a> group and a <a href="/wiki/Sugar" title="Sugar">sugar</a> (<a href="/wiki/Ribose" title="Ribose">ribose</a> in the case of <a href="/wiki/RNA" title="RNA">RNA</a>, <a href="/wiki/Deoxyribose" title="Deoxyribose">deoxyribose</a> in <a href="/wiki/DNA" title="DNA">DNA</a>) make up the backbone of the nucleic acid strand, and attached to the sugar is one of a set of <a href="/wiki/Nucleobase" class="mw-redirect" title="Nucleobase">nucleobases</a>. The nucleobases are important in <a href="/wiki/Base_pair" title="Base pair">base pairing</a> of strands to form higher-level <a href="/wiki/Nucleic_acid_secondary_structure" title="Nucleic acid secondary structure">secondary</a> and <a href="/wiki/Nucleic_acid_tertiary_structure" title="Nucleic acid tertiary structure">tertiary structures</a> such as the famed <a href="/wiki/Nucleic_acid_double_helix" title="Nucleic acid double helix">double helix</a>. </p><p>The possible letters are <i>A</i>, <i>C</i>, <i>G</i>, and <i>T</i>, representing the four <a href="/wiki/Nucleotide" title="Nucleotide">nucleotide</a> <a href="/wiki/Nucleobase" class="mw-redirect" title="Nucleobase">bases</a> of a DNA strand – <a href="/wiki/Adenine" title="Adenine">adenine</a>, <a href="/wiki/Cytosine" title="Cytosine">cytosine</a>, <a href="/wiki/Guanine" title="Guanine">guanine</a>, <a href="/wiki/Thymine" title="Thymine">thymine</a> – <a href="/wiki/Covalent" class="mw-redirect" title="Covalent">covalently</a> linked to a <a href="/wiki/Phosphodiester_bond" title="Phosphodiester bond">phosphodiester</a> backbone. In the typical case, the sequences are printed abutting one another without gaps, as in the sequence AAAGTCTGAC, read left to right in the <a href="/wiki/Directionality_(molecular_biology)" title="Directionality (molecular biology)">5' to 3'</a> direction. With regards to <a href="/wiki/Transcription_(biology)" title="Transcription (biology)">transcription</a>, a sequence is on the coding strand if it has the same order as the transcribed RNA. </p><p>One sequence can be <a href="/wiki/Complementarity_(molecular_biology)" title="Complementarity (molecular biology)">complementary</a> to another sequence, meaning that they have the base on each position in the complementary (i.e., A to T, C to G) and in the reverse order. For example, the complementary sequence to TTAC is GTAA. If one strand of the double-stranded DNA is considered the sense strand, then the other strand, considered the antisense strand, will have the complementary sequence to the sense strand. </p> <div class="mw-heading mw-heading3"><h3 id="Notation">Notation</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Nucleic_acid_sequence&action=edit&section=2" title="Edit section: Notation"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Nucleic_acid_notation" title="Nucleic acid notation">Nucleic acid notation</a></div> <p>While A, T, C, and G represent a particular nucleotide at a position, there are also letters that represent ambiguity which are used when more than one kind of nucleotide could occur at that position. The rules of the International Union of Pure and Applied Chemistry (<a href="/wiki/IUPAC" class="mw-redirect" title="IUPAC">IUPAC</a>) are as follows:<sup id="cite_ref-:0_1-0" class="reference"><a href="#cite_note-:0-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </p><p>For example, <b>W</b> means that either an adenine or a thymine could occur in that position without impairing the sequence's functionality. </p> <table class="wikitable" style="margin-left:25px; margin-top:0px; text-align:center;"> <caption>List of symbols </caption> <tbody><tr> <th>Symbol<sup id="cite_ref-iupac_2-0" class="reference"><a href="#cite_note-iupac-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup></th> <th>Meaning/derivation</th> <th colspan="5">Possible bases</th> <th>Complement </th></tr> <tr> <td><b>A</b></td> <td align="left"><a href="/wiki/Adenine" title="Adenine"><b>A</b>denine</a></td> <td>A</td> <td></td> <td></td> <td></td> <td rowspan="5">1</td> <td>T (or U) </td></tr> <tr> <td><b>C</b></td> <td align="left"><a href="/wiki/Cytosine" title="Cytosine"><b>C</b>ytosine</a></td> <td></td> <td>C</td> <td></td> <td></td> <td>G </td></tr> <tr> <td><b>G</b></td> <td align="left"><a href="/wiki/Guanine" title="Guanine"><b>G</b>uanine</a></td> <td></td> <td></td> <td>G</td> <td></td> <td>C </td></tr> <tr> <td><b>T</b></td> <td align="left"><a href="/wiki/Thymine" title="Thymine"><b>T</b>hymine</a></td> <td></td> <td></td> <td></td> <td>T</td> <td>A </td></tr> <tr> <td><b>U</b></td> <td align="left"><a href="/wiki/Uracil" title="Uracil"><b>U</b>racil</a></td> <td></td> <td></td> <td></td> <td>U</td> <td>A </td></tr> <tr bgcolor="#e8e8e8"> <td><b>W</b></td> <td align="left"><b>W</b>eak</td> <td>A</td> <td></td> <td></td> <td>T</td> <td rowspan="6">2</td> <td>S </td></tr> <tr bgcolor="#e8e8e8"> <td><b>S</b></td> <td align="left"><b>S</b>trong</td> <td></td> <td>C</td> <td>G</td> <td></td> <td>W </td></tr> <tr bgcolor="#e8e8e8"> <td><b>M</b></td> <td align="left"><a href="/wiki/Amine" title="Amine">a<b>M</b>ino</a></td> <td>A</td> <td>C</td> <td></td> <td></td> <td>K </td></tr> <tr bgcolor="#e8e8e8"> <td><b>K</b></td> <td align="left"><a href="/wiki/Ketone" title="Ketone"><b>K</b>eto</a></td> <td></td> <td></td> <td>G</td> <td>T</td> <td>M </td></tr> <tr bgcolor="#e8e8e8"> <td><b>R</b></td> <td align="left"><a href="/wiki/Purine" title="Purine">pu<b>R</b>ine</a></td> <td>A</td> <td></td> <td>G</td> <td></td> <td>Y </td></tr> <tr bgcolor="#e8e8e8"> <td><b>Y</b></td> <td align="left"><a href="/wiki/Pyrimidine" title="Pyrimidine">p<b>Y</b>rimidine</a></td> <td></td> <td>C</td> <td></td> <td>T</td> <td>R </td></tr> <tr> <td><b>B</b></td> <td align="left">not A (<b>B</b> comes after A)</td> <td></td> <td>C</td> <td>G</td> <td>T</td> <td rowspan="4">3</td> <td>V </td></tr> <tr> <td><b>D</b></td> <td align="left">not C (<b>D</b> comes after C)</td> <td>A</td> <td></td> <td>G</td> <td>T</td> <td>H </td></tr> <tr> <td><b>H</b></td> <td align="left">not G (<b>H</b> comes after G)</td> <td>A</td> <td>C</td> <td></td> <td>T</td> <td>D </td></tr> <tr> <td><b>V</b></td> <td align="left">not T (<b>V</b> comes after T and U)</td> <td>A</td> <td>C</td> <td>G</td> <td></td> <td>B </td></tr> <tr bgcolor="#e8e8e8"> <td><b>N</b></td> <td align="left">any <b>N</b>ucleotide (not a gap)</td> <td>A</td> <td>C</td> <td>G</td> <td>T</td> <td>4</td> <td>N </td></tr> <tr> <td><b>Z</b></td> <td align="left"><a href="/wiki/0" title="0"><b>Z</b>ero</a></td> <td></td> <td></td> <td></td> <td></td> <td>0</td> <td>Z </td></tr></tbody></table> <p>These symbols are also valid for RNA, except with U (uracil) replacing T (thymine).<sup id="cite_ref-:0_1-1" class="reference"><a href="#cite_note-:0-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </p><p>Apart from adenine (A), cytosine (C), guanine (G), thymine (T) and uracil (U), DNA and RNA also contain bases that have been modified after the nucleic acid chain has been formed. In DNA, the most common modified base is <a href="/wiki/5-Methylcytidine" title="5-Methylcytidine">5-methylcytidine</a> (m5C). In RNA, there are many modified bases, including <a href="/wiki/Pseudouridine" title="Pseudouridine">pseudouridine</a> (Ψ), <a href="/wiki/Dihydrouridine" title="Dihydrouridine">dihydrouridine</a> (D), <a href="/wiki/Inosine" title="Inosine">inosine</a> (I), <a href="/wiki/Ribothymidine" class="mw-redirect" title="Ribothymidine">ribothymidine</a> (rT) and <a href="/wiki/7-methylguanosine" class="mw-redirect" title="7-methylguanosine">7-methylguanosine</a> (m7G).<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> <a href="/wiki/Hypoxanthine" title="Hypoxanthine">Hypoxanthine</a> and <a href="/wiki/Xanthine" title="Xanthine">xanthine</a> are two of the many bases created through <a href="/wiki/Mutagen" title="Mutagen">mutagen</a> presence, both of them through deamination (replacement of the amine-group with a carbonyl-group). Hypoxanthine is produced from <a href="/wiki/Adenine" title="Adenine">adenine</a>, and xanthine is produced from <a href="/wiki/Guanine" title="Guanine">guanine</a>.<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> Similarly, deamination of <a href="/wiki/Cytosine" title="Cytosine">cytosine</a> results in <a href="/wiki/Uracil" title="Uracil">uracil</a>. </p> <dl><dt>Example of comparing and determining the % difference between two nucleotide sequences</dt></dl> <ul><li>AA<b>T</b>CC<b>GC</b>TAG</li> <li>AA<b>A</b>CC<b>CT</b>TAG</li></ul> <p>Given the two 10-nucleotide sequences, line them up and compare the differences between them. Calculate the percent difference by taking the number of differences between the DNA bases divided by the total number of nucleotides. In this case there are three differences in the 10 nucleotide sequence. Thus there is a 30% difference. </p> <div class="mw-heading mw-heading2"><h2 id="Biological_significance">Biological significance</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Nucleic_acid_sequence&action=edit&section=3" title="Edit section: Biological significance"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Kooditabel.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/9/94/Kooditabel.png/200px-Kooditabel.png" decoding="async" width="200" height="201" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/94/Kooditabel.png/300px-Kooditabel.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/94/Kooditabel.png/400px-Kooditabel.png 2x" data-file-width="413" data-file-height="416" /></a><figcaption>A depiction of the <a href="/wiki/Genetic_code" title="Genetic code">genetic code</a>, by which the information contained in <a href="/wiki/Nucleic_acid" title="Nucleic acid">nucleic acids</a> are <a href="/wiki/Translation_(genetics)" class="mw-redirect" title="Translation (genetics)">translated</a> into <a href="/wiki/Amino_acid" title="Amino acid">amino acid</a> sequences in <a href="/wiki/Protein" title="Protein">proteins</a>.</figcaption></figure> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Further information: <a href="/wiki/Genetic_code" title="Genetic code">Genetic code</a> and <a href="/wiki/Central_dogma_of_molecular_biology" title="Central dogma of molecular biology">Central dogma of molecular biology</a></div> <p>In biological systems, nucleic acids contain information which is used by a living <a href="/wiki/Cell_(biology)" title="Cell (biology)">cell</a> to construct specific <a href="/wiki/Protein" title="Protein">proteins</a>. The sequence of <a href="/wiki/Nucleobase" class="mw-redirect" title="Nucleobase">nucleobases</a> on a nucleic acid strand is <a href="/wiki/Translation_(genetics)" class="mw-redirect" title="Translation (genetics)">translated</a> by cell machinery into a sequence of <a href="/wiki/Amino_acid" title="Amino acid">amino acids</a> making up a protein strand. Each group of three bases, called a <a href="/wiki/Codon" class="mw-redirect" title="Codon">codon</a>, corresponds to a single amino acid, and there is a specific <a href="/wiki/Genetic_code" title="Genetic code">genetic code</a> by which each possible combination of three bases corresponds to a specific amino acid. </p><p>The <a href="/wiki/Central_dogma_of_molecular_biology" title="Central dogma of molecular biology">central dogma of molecular biology</a> outlines the mechanism by which proteins are constructed using information contained in nucleic acids. <a href="/wiki/DNA" title="DNA">DNA</a> is <a href="/wiki/Transcription_(genetics)" class="mw-redirect" title="Transcription (genetics)">transcribed</a> into <a href="/wiki/MRNA" class="mw-redirect" title="MRNA">mRNA</a> molecules, which travel to the <a href="/wiki/Ribosome" title="Ribosome">ribosome</a> where the mRNA is used as a template for the construction of the protein strand. Since nucleic acids can bind to molecules with <a href="/wiki/Complementarity_(molecular_biology)" title="Complementarity (molecular biology)">complementary</a> sequences, there is a distinction between "<a href="/wiki/Sense_(molecular_biology)" title="Sense (molecular biology)">sense</a>" sequences which code for proteins, and the complementary "antisense" sequence, which is by itself nonfunctional, but can bind to the sense strand. </p> <div class="mw-heading mw-heading2"><h2 id="Sequence_determination">Sequence determination</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Nucleic_acid_sequence&action=edit&section=4" title="Edit section: Sequence determination"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:DNA_sequence.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/1/18/DNA_sequence.svg/268px-DNA_sequence.svg.png" decoding="async" width="268" height="174" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/18/DNA_sequence.svg/402px-DNA_sequence.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/18/DNA_sequence.svg/536px-DNA_sequence.svg.png 2x" data-file-width="332" data-file-height="215" /></a><figcaption><a href="/wiki/Electropherogram" title="Electropherogram">Electropherogram</a> printout from automated sequencer for determining part of a DNA sequence</figcaption></figure> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/DNA_sequencing" title="DNA sequencing">DNA sequencing</a></div> <p>DNA sequencing is the process of determining the <a href="/wiki/Nucleotide" title="Nucleotide">nucleotide</a> sequence of a given <a href="/wiki/DNA" title="DNA">DNA</a> fragment. The sequence of the DNA of a living thing encodes the necessary information for that living thing to survive and reproduce. Therefore, determining the sequence is useful in fundamental research into why and how organisms live, as well as in applied subjects. Because of the importance of DNA to living things, knowledge of a DNA sequence may be useful in practically any biological <a href="/wiki/Research" title="Research">research</a>. For example, in <a href="/wiki/Medicine" title="Medicine">medicine</a> it can be used to identify, <a href="/wiki/Diagnosis" title="Diagnosis">diagnose</a> and potentially develop <a href="/wiki/Therapy" title="Therapy">treatments</a> for <a href="/wiki/Genetic_disease" class="mw-redirect" title="Genetic disease">genetic diseases</a>. Similarly, research into <a href="/wiki/Pathogens" class="mw-redirect" title="Pathogens">pathogens</a> may lead to treatments for contagious diseases. <a href="/wiki/Biotechnology" title="Biotechnology">Biotechnology</a> is a burgeoning discipline, with the potential for many useful products and services. </p><p>RNA is not sequenced directly. Instead, it is copied to a DNA by <a href="/wiki/Reverse_transcriptase" title="Reverse transcriptase">reverse transcriptase</a>, and this DNA is then sequenced. </p><p>Current sequencing methods rely on the discriminatory ability of DNA polymerases, and therefore can only distinguish four bases. An inosine (created from adenosine during <a href="/wiki/RNA_editing" title="RNA editing">RNA editing</a>) is read as a G, and 5-methyl-cytosine (created from cytosine by <a href="/wiki/DNA_methylation" title="DNA methylation">DNA methylation</a>) is read as a C. With current technology, it is difficult to sequence small amounts of DNA, as the signal is too weak to measure. This is overcome by <a href="/wiki/Polymerase_chain_reaction" title="Polymerase chain reaction">polymerase chain reaction</a> (PCR) amplification. </p> <div class="mw-heading mw-heading3"><h3 id="Digital_representation">Digital representation</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Nucleic_acid_sequence&action=edit&section=5" title="Edit section: Digital representation"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:AMY1gene.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/1/11/AMY1gene.png/370px-AMY1gene.png" decoding="async" width="370" height="141" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/11/AMY1gene.png/555px-AMY1gene.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/11/AMY1gene.png/740px-AMY1gene.png 2x" data-file-width="1147" data-file-height="436" /></a><figcaption>Genetic sequence in digital format.</figcaption></figure> <p>Once a nucleic acid sequence has been obtained from an organism, it is stored <i><a href="/wiki/In_silico" title="In silico">in silico</a></i> in digital format. Digital genetic sequences may be stored in <a href="/wiki/Sequence_database" title="Sequence database">sequence databases</a>, be analyzed (see <i>Sequence analysis</i> below), be digitally altered and be used as templates for creating new actual DNA using <a href="/wiki/Artificial_gene_synthesis" title="Artificial gene synthesis">artificial gene synthesis</a>. </p> <div class="mw-heading mw-heading2"><h2 id="Sequence_analysis">Sequence analysis</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Nucleic_acid_sequence&action=edit&section=6" title="Edit section: Sequence analysis"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Sequence_analysis" title="Sequence analysis">Sequence analysis</a></div> <p>Digital genetic sequences may be analyzed using the tools of <a href="/wiki/Bioinformatics" title="Bioinformatics">bioinformatics</a> to attempt to determine its function. </p> <div class="mw-heading mw-heading3"><h3 id="Genetic_testing">Genetic testing</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Nucleic_acid_sequence&action=edit&section=7" title="Edit section: Genetic testing"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Genetic_testing" title="Genetic testing">Genetic testing</a></div> <p>The DNA in an organism's <a href="/wiki/Genome" title="Genome">genome</a> can be analyzed to <a href="/wiki/Medical_diagnosis" title="Medical diagnosis">diagnose</a> vulnerabilities to inherited <a href="/wiki/Disease" title="Disease">diseases</a>, and can also be used to determine a child's paternity (genetic father) or a person's <a href="/wiki/Ancestry" class="mw-redirect" title="Ancestry">ancestry</a>. Normally, every person carries two variations of every <a href="/wiki/Gene" title="Gene">gene</a>, one inherited from their mother, the other inherited from their father. The <a href="/wiki/Human_genome" title="Human genome">human genome</a> is believed to contain around 20,000–25,000 genes. In addition to studying <a href="/wiki/Chromosome" title="Chromosome">chromosomes</a> to the level of individual genes, genetic testing in a broader sense includes <a href="/wiki/Biochemical" class="mw-redirect" title="Biochemical">biochemical</a> tests for the possible presence of <a href="/wiki/Genetic_disease" class="mw-redirect" title="Genetic disease">genetic diseases</a>, or mutant forms of genes associated with increased risk of developing genetic disorders. </p><p>Genetic testing identifies changes in chromosomes, genes, or proteins.<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> Usually, testing is used to find changes that are associated with inherited disorders. The results of a genetic test can confirm or rule out a suspected genetic condition or help determine a person's chance of developing or passing on a genetic disorder. Several hundred genetic tests are currently in use, and more are being developed.<sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Sequence_alignment">Sequence alignment</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Nucleic_acid_sequence&action=edit&section=8" title="Edit section: Sequence alignment"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Sequence_alignment" title="Sequence alignment">Sequence alignment</a></div> <p>In bioinformatics, a sequence alignment is a way of arranging the sequences of <a href="/wiki/DNA" title="DNA">DNA</a>, <a href="/wiki/RNA" title="RNA">RNA</a>, or <a href="/wiki/Protein" title="Protein">protein</a> to identify regions of similarity that may be due to functional, <a href="/wiki/Structural_biology" title="Structural biology">structural</a>, or <a href="/wiki/Evolution" title="Evolution">evolutionary</a> relationships between the sequences.<sup id="cite_ref-mount_9-0" class="reference"><a href="#cite_note-mount-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> If two sequences in an alignment share a common ancestor, mismatches can be interpreted as <a href="/wiki/Point_mutation" title="Point mutation">point mutations</a> and gaps as <a href="/wiki/Insertion_(genetics)" title="Insertion (genetics)">insertion</a> or <a href="/wiki/Deletion_(genetics)" title="Deletion (genetics)">deletion mutations</a> (<a href="/wiki/Indel" title="Indel">indels</a>) introduced in one or both lineages in the time since they diverged from one another. In sequence alignments of proteins, the degree of similarity between <a href="/wiki/Amino_acid" title="Amino acid">amino acids</a> occupying a particular position in the sequence can be interpreted as a rough measure of how <a href="/wiki/Conservation_(genetics)" class="mw-redirect" title="Conservation (genetics)">conserved</a> a particular region or <a href="/wiki/Sequence_motif" title="Sequence motif">sequence motif</a> is among lineages. The absence of substitutions, or the presence of only very conservative substitutions (that is, the substitution of amino acids whose <a href="/wiki/Side_chain" title="Side chain">side chains</a> have similar biochemical properties) in a particular region of the sequence, suggest<sup id="cite_ref-predict_10-0" class="reference"><a href="#cite_note-predict-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> that this region has structural or functional importance. Although DNA and RNA <a href="/wiki/Nucleotide" title="Nucleotide">nucleotide</a> bases are more similar to each other than are amino acids, the conservation of base pairs can indicate a similar functional or structural role.<sup id="cite_ref-11" class="reference"><a href="#cite_note-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> </p><p><a href="/wiki/Computational_phylogenetics" title="Computational phylogenetics">Computational phylogenetics</a> makes extensive use of sequence alignments in the construction and interpretation of <a href="/wiki/Phylogenetic_tree" title="Phylogenetic tree">phylogenetic trees</a>, which are used to classify the evolutionary relationships between homologous genes represented in the genomes of divergent species. The degree to which sequences in a query set differ is qualitatively related to the sequences' evolutionary distance from one another. Roughly speaking, high sequence identity suggests that the sequences in question have a comparatively young <a href="/wiki/Most_recent_common_ancestor" title="Most recent common ancestor">most recent common ancestor</a>, while low identity suggests that the divergence is more ancient. This approximation, which reflects the "<a href="/wiki/Molecular_clock" title="Molecular clock">molecular clock</a>" hypothesis that a roughly constant <a href="/wiki/Rate_of_evolution" title="Rate of evolution">rate of evolutionary change</a> can be used to extrapolate the elapsed time since two genes first diverged (that is, the <a href="/wiki/Coalescence_(genetics)" class="mw-redirect" title="Coalescence (genetics)">coalescence</a> time), assumes that the effects of mutation and <a href="/wiki/Natural_selection" title="Natural selection">selection</a> are constant across sequence lineages. Therefore, it does not account for possible differences among organisms or species in the rates of <a href="/wiki/DNA_repair" title="DNA repair">DNA repair</a> or the possible functional conservation of specific regions in a sequence. (In the case of nucleotide sequences, the molecular clock hypothesis in its most basic form also discounts the difference in acceptance rates between <a href="/wiki/Silent_mutation" title="Silent mutation">silent mutations</a> that do not alter the meaning of a given <a href="/wiki/Codon" class="mw-redirect" title="Codon">codon</a> and other mutations that result in a different <a href="/wiki/Amino_acid" title="Amino acid">amino acid</a> being incorporated into the protein.) More statistically accurate methods allow the evolutionary rate on each branch of the phylogenetic tree to vary, thus producing better estimates of coalescence times for genes. </p> <div class="mw-heading mw-heading3"><h3 id="Sequence_motifs">Sequence motifs</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Nucleic_acid_sequence&action=edit&section=9" title="Edit section: Sequence motifs"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Sequence_motif" title="Sequence motif">Sequence motif</a></div> <p>Frequently the primary structure encodes motifs that are of functional importance. Some examples of sequence motifs are: the C/D<sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> and H/ACA boxes<sup id="cite_ref-13" class="reference"><a href="#cite_note-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup> of <a href="/wiki/SnoRNA" class="mw-redirect" title="SnoRNA">snoRNAs</a>, <a href="/wiki/LSm" title="LSm">Sm binding site</a> found in spliceosomal RNAs such as <a href="/wiki/U1_spliceosomal_RNA" title="U1 spliceosomal RNA">U1</a>, <a href="/wiki/U2_spliceosomal_RNA" title="U2 spliceosomal RNA">U2</a>, <a href="/wiki/U4_spliceosomal_RNA" title="U4 spliceosomal RNA">U4</a>, <a href="/wiki/U5_spliceosomal_RNA" title="U5 spliceosomal RNA">U5</a>, <a href="/wiki/U6_spliceosomal_RNA" title="U6 spliceosomal RNA">U6</a>, <a href="/wiki/U12_minor_spliceosomal_RNA" title="U12 minor spliceosomal RNA">U12</a> and <a href="/wiki/Small_nucleolar_RNA_U3" title="Small nucleolar RNA U3">U3</a>, the <a href="/wiki/Shine-Dalgarno_sequence" class="mw-redirect" title="Shine-Dalgarno sequence">Shine-Dalgarno sequence</a>,<sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup> the <a href="/wiki/Kozak_consensus_sequence" title="Kozak consensus sequence">Kozak consensus sequence</a><sup id="cite_ref-Kozak1987_15-0" class="reference"><a href="#cite_note-Kozak1987-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup> and the <a href="/wiki/RNA_polymerase_III" title="RNA polymerase III">RNA polymerase III terminator</a>.<sup id="cite_ref-pmid6263489_16-0" class="reference"><a href="#cite_note-pmid6263489-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Sequence_entropy">Sequence entropy</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Nucleic_acid_sequence&action=edit&section=10" title="Edit section: Sequence entropy"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>In <a href="/wiki/Bioinformatics" title="Bioinformatics">bioinformatics</a>, a sequence entropy, also known as sequence complexity or information profile,<sup id="cite_ref-glance_17-0" class="reference"><a href="#cite_note-glance-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup> is a numerical sequence providing a quantitative measure of the local complexity of a DNA sequence, independently of the direction of processing. The manipulations of the information profiles enable the analysis of the sequences using alignment-free techniques, such as for example in motif and rearrangements detection.<sup id="cite_ref-glance_17-1" class="reference"><a href="#cite_note-glance-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-rearrang_18-0" class="reference"><a href="#cite_note-rearrang-18"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup> <sup id="cite_ref-troy_19-0" class="reference"><a href="#cite_note-troy-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</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=Nucleic_acid_sequence&action=edit&section=11" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Gene_structure" title="Gene structure">Gene structure</a></li> <li><a href="/wiki/Nucleic_acid_structure_determination" title="Nucleic acid structure determination">Nucleic acid structure determination</a></li> <li><a href="/wiki/Quaternary_numeral_system" title="Quaternary numeral system">Quaternary numeral system</a></li> <li><a href="/wiki/Single-nucleotide_polymorphism" title="Single-nucleotide polymorphism">Single-nucleotide polymorphism</a> (SNP)</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=Nucleic_acid_sequence&action=edit&section=12" 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 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id="CITEREFTroyanskayaArbell,_OKoren,_YLandau,_G2002" class="citation journal cs1">Troyanskaya, O; Arbell, O; Koren, Y; Landau, G; Bolshoy, A (2002). <a rel="nofollow" class="external text" href="https://doi.org/10.1093%2Fbioinformatics%2F18.5.679">"Sequence complexity profiles of prokaryotic genomic sequences: A fast algorithm for calculating linguistic complexity"</a>. <i>Bioinformatics</i>. <b>18</b> (5): 679–88. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://doi.org/10.1093%2Fbioinformatics%2F18.5.679">10.1093/bioinformatics/18.5.679</a></span>. <a href="/wiki/PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a> <a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/12050064">12050064</a>.</cite><span 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style="background:lightblue;width:1%"><a href="/wiki/Nucleic_acid_structure" title="Nucleic acid structure">Nucleic acid</a></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 class="mw-selflink selflink">Primary</a></li> <li><a href="/wiki/Nucleic_acid_secondary_structure" title="Nucleic acid secondary structure">Secondary</a></li> <li><a href="/wiki/Nucleic_acid_tertiary_structure" title="Nucleic acid tertiary structure">Tertiary</a></li> <li><a href="/wiki/Nucleic_acid_quaternary_structure" title="Nucleic acid quaternary structure">Quaternary</a></li> <li><a href="/wiki/Nucleic_acid_structure_determination" title="Nucleic acid structure determination">Determination</a></li> <li><a href="/wiki/Nucleic_acid_structure_prediction" title="Nucleic acid structure prediction">Prediction</a></li> <li><a href="/wiki/Nucleic_acid_design" title="Nucleic acid design">Design</a></li> <li><a href="/wiki/Nucleic_acid_thermodynamics" title="Nucleic acid thermodynamics">Thermodynamics</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="background:lightblue;width:1%">See also</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/Protein" title="Protein">Protein</a></li> <li><a href="/wiki/Protein_domain" title="Protein domain">Protein domain</a></li> <li><a href="/wiki/Protein_engineering" title="Protein engineering">Protein engineering</a></li> <li><a href="/wiki/Proteasome" title="Proteasome">Proteasome</a></li> <li><a href="/wiki/Nucleic_acid" title="Nucleic acid">Nucleic acid</a></li> <li><a href="/wiki/DNA" title="DNA">DNA</a></li> <li><a href="/wiki/RNA" title="RNA">RNA</a></li> <li><a href="/wiki/Structural_motif" title="Structural motif">Structural motif</a></li> <li><a href="/wiki/Nucleic_acid_double_helix" title="Nucleic acid double helix">Nucleic acid double helix</a></li></ul> </div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"></div><div role="navigation" class="navbox authority-control" aria-label="Navbox" style="padding:3px"><table class="nowraplinks hlist navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Help:Authority_control" title="Help:Authority control">Authority control databases</a>: National <span class="mw-valign-text-top noprint" typeof="mw:File/Frameless"><a href="https://www.wikidata.org/wiki/Q863908#identifiers" title="Edit this at Wikidata"><img alt="Edit this at Wikidata" src="//upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/10px-OOjs_UI_icon_edit-ltr-progressive.svg.png" 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