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<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Doklady Biological Sciences</journal-id><journal-title-group><journal-title xml:lang="en">Doklady Biological Sciences</journal-title><trans-title-group xml:lang="ru"><trans-title>Доклады Российской академии наук. Науки о жизни</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2686-7389</issn><issn publication-format="electronic">3034-5057</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">684010</article-id><article-id pub-id-type="doi">10.31857/S2686738925020098</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Статьи</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Investigation of the functional role of the conserved sequence at the 5’-end of the fourth intron of the <italic>mod(mdg4)</italic> gene in trans-splicing in <italic>Drosophila melanogaster</italic></article-title><trans-title-group xml:lang="ru"><trans-title>Исследование функциональной роли консервативной последовательности на 5'-конце четвертого интрона гена <italic>mod(mdg4)</italic> в транс-сплайсинге у <italic>Drosophila melanogaster</italic></trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Soldatova</surname><given-names>Iu. V.</given-names></name><name xml:lang="ru"><surname>Солдатова</surname><given-names>Ю. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>me@mtih.me</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Beginyazova</surname><given-names>O.</given-names></name><name xml:lang="ru"><surname>Бегинязова</surname><given-names>О.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>me@mtih.me</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Georgiev</surname><given-names>P. G.</given-names></name><name xml:lang="ru"><surname>Георгиев</surname><given-names>П. Г.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Academician of the RAS</p></bio><bio xml:lang="ru"><p>академик РАН</p></bio><email>me@mtih.me</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Tikhonov</surname><given-names>M. V.</given-names></name><name xml:lang="ru"><surname>Тихонов</surname><given-names>М. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>me@mtih.me</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Institute of Gene Biology Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Федеральное государственное бюджетное учреждение науки Институт биологии гена Российской академии наук (ИБГ РАН)</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-04-15" publication-format="electronic"><day>15</day><month>04</month><year>2025</year></pub-date><volume>521</volume><issue>1</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>219</fpage><lpage>224</lpage><history><date date-type="received" iso-8601-date="2025-06-11"><day>11</day><month>06</month><year>2025</year></date><date date-type="accepted" iso-8601-date="2025-06-11"><day>11</day><month>06</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Российская академия наук</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Russian Academy of Sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/2686-7389/article/view/684010">https://journals.eco-vector.com/2686-7389/article/view/684010</self-uri><abstract xml:lang="en"><p>Alternative splicing is an important mechanism that provides genetic diversity of proteins. Unique loci have been identified in <italic>Drosophila melanogaster</italic>, where mRNA diversity arises as a result of trans-splicing — a process in which exons from different pre-mRNAs are joined together. The trans-splicing in the <italic>mod(mdg4)</italic> locus, which encodes more than 31 isoforms, has been studied in detail. Important elements for this process include previously described conserved sequences in the fourth intron. The aim of this study is to further characterize the conserved motifs of the fourth intron, specifically the element at the 5’-end of the intron. Using model transgenic lines, it has been shown that introduced changes in the sequence of the studied element lead to a disruption of trans-splicing. In contrast, similar changes in the endogenous locus did not result in a disruption of trans-splicing. Thus, the conserved element plays a role in trans-splicing but is not critical.</p></abstract><trans-abstract xml:lang="ru"><p>Альтернативный сплайсинг представляет собой важный механизм, обеспечивающий генетическое разнообразие белков. У <italic>Drosophila melanogaster</italic> были обнаружены уникальные локусы, где разнообразие мРНК возникает в результате транс-сплайсинга — процесса, при котором экзоны из различных пре-мРНК соединяются. Наиболее подробно исследован транс-сплайсинг в локусе <italic>mod(mdg4)</italic>, который кодирует более 31 изоформы. Важными элементами для этого процесса являются ранее описанные консервативные последовательности в четвертом интроне. Целью данного исследования является дальнейшая характеристика консервативных мотивов четвертого интрона, а именно элемента на 5'-конце интрона. С помощью модельных трансгенных линий показано, что внесенные замены в последовательность изучаемого элемента приводят к нарушению транс-сплайсинга. Напротив, аналогичные изменения в эндогенном локусе не привели к нарушению транс-сплайсинга. Таким образом, консервативный элемент играет роль в транс-сплайсинге, но не является ключевым.</p></trans-abstract><kwd-group xml:lang="en"><kwd>alternative splicing</kwd><kwd>trans-splicing</kwd><kwd>Drosophila melanogaster</kwd><kwd>mod(mdg4)</kwd><kwd>splicing sites</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>альтернативный сплайсинг</kwd><kwd>транс-сплайсинг</kwd><kwd>Drosophila melanogaster</kwd><kwd>mod(mdg4)</kwd><kwd>сайты сплайсинга</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Российский научный фонд</institution></institution-wrap><institution-wrap><institution xml:lang="en">Russian Science Foundation</institution></institution-wrap></funding-source><award-id>23-44-00038</award-id></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Wright C.J., Smith C.W.J., Jiggins C.D. 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