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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">Russian Journal of Genetics</journal-id><journal-title-group><journal-title xml:lang="en">Russian Journal of Genetics</journal-title><trans-title-group xml:lang="ru"><trans-title>Генетика</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0016-6758</issn><issn publication-format="electronic">3034-5103</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">666942</article-id><article-id pub-id-type="doi">10.31857/S0016675824040034</article-id><article-id pub-id-type="edn">cripiz</article-id><article-categories><subj-group subj-group-type="toc-heading"><subject>МОЛЕКУЛЯРНАЯ ГЕНЕТИКА</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"><italic>Drosophila melanogaster</italic> MLE Helicase functions beyond dosage compensation: molecular nature and pleiotropic effect of <italic>mle[9]</italic></article-title><trans-title-group xml:lang="ru"><trans-title>Функции хеликазы MLE <italic>Drosophila melanogaster</italic> вне дозовой компенсации: молекулярная природа и плейотропный эффект мутации <italic>mle[9]</italic></trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Ashniev</surname><given-names>G. A.</given-names></name><name xml:lang="ru"><surname>Ашниев</surname><given-names>Г. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>julia.v.nikolenko@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Georgieva</surname><given-names>S. G.</given-names></name><name xml:lang="ru"><surname>Георгиева</surname><given-names>С. Г.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>julia.v.nikolenko@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Nikolenko</surname><given-names>J. V.</given-names></name><name xml:lang="ru"><surname>Николенко</surname><given-names>Ю. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>julia.v.nikolenko@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Engelhardt Institute of Molecular Biology, Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Институт молекулярной биологии им. В.А. Энгельгардта Российской академии наук</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2024-04-11" publication-format="electronic"><day>11</day><month>04</month><year>2024</year></pub-date><volume>60</volume><issue>4</issue><fpage>34</fpage><lpage>46</lpage><history><date date-type="received" iso-8601-date="2025-02-26"><day>26</day><month>02</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2024, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2024, Российская академия наук</copyright-statement><copyright-year>2024</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://transsyst.ru/0016-6758/article/view/666942">https://transsyst.ru/0016-6758/article/view/666942</self-uri><abstract xml:lang="en"><p>MLE of <italic>D. melanogaster</italic> is a conserved protein in higher eukaryotes, an ortholog of human DHX9 helicase. In mammals, this helicase has been shown to participate in different stages of gene expression. In <italic>D. melanogaster</italic>, the role of MLE as one of the components of the species-specific Dosage Compensation Complex has been extensively studied. However, the role of MLE in other processes has remained poorly understood. In this work, for the first time, the <italic>mle[9]</italic> mutation is mapped at the molecular level and shown to be caused by a deletion resulting in the loss of a highly conserved motif III in the catalytic core of the molecule. Thus, <italic>mle[9]</italic> specifically disrupts the helicase activity of the protein without affecting the function of other domains. The study of phenotypic manifestations of the mutation in females showed that in the homozygous state it has a pleiotropic effect. Without affecting survival, it significantly reduces fertility and lifespan. In addition, the duplication of scutellar macrochaetae was observed with high frequency. These results confirm that in <italic>D. melanogaster </italic>MLE helicase is involved in a wide range of gene expression regulation processes distinct from its role in dosage compensation.</p></abstract><trans-abstract xml:lang="ru"><p>Хеликаза <italic>Drosophila melanogaster </italic>MLE – консервативный у высших эукариот белок, ортолог хеликазы DHX9 человека. У млекопитающих показано участие этой хеликазы на разных стадиях экспрессии генов. У <italic>D. melanogaster</italic> активно изучалась роль MLE как одного из компонентов видоспецифичного комплекса дозовой компенсации. Однако роль MLE в других процессах оставалась мало изученной. В данной работе впервые картирована на молекулярном уровне мутация <italic>mle[9] </italic>и показано, что она вызвана делецией, приводящей к утрате высококонсервативного мотива III в каталитическом “ядре” молекулы. Таким образом, мутация <italic>mle[9]</italic> специфически нарушает хеликазную активность белка, не затрагивая функции других доменов. Изучение фенотипических проявлений мутации у самок показало, что в гомозиготном состоянии она имеет плейотропный эффект. Не оказывая влияния на выживаемость, она существенно снижает фертильность и продолжительность жизни. Кроме того, с высокой частотой наблюдается удвоение скутеллярных макрохет. Полученные результаты подтверждают, что у <italic>D. melanogaster</italic> хеликаза MLE вне дозовой компенсации вовлечена в широкий спектр процессов регуляции экспрессии генов.</p></trans-abstract><kwd-group xml:lang="en"><kwd>MLE</kwd><kwd>helicase</kwd><kwd>lifespan</kwd><kwd>fertility</kwd><kwd>pleiotropic phenotype</kwd><kwd>Drosophila melanogaster</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>MLE</kwd><kwd>хеликаза</kwd><kwd>продолжительность жизни</kwd><kwd>фертильность</kwd><kwd>плейотропный фенотип</kwd><kwd>Drosophila melanogaster</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>№ 23-24-00357</award-id></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Singleton M.R., Dillingham M.S., Wigley D.B. Structure and mechanism of helicases and nucleic acid translocases // Annu. 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