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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">Доклады Академии наук</journal-id><journal-title-group><journal-title xml:lang="en">Доклады Академии наук</journal-title><trans-title-group xml:lang="ru"><trans-title>Доклады Академии наук</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0869-5652</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">14483</article-id><article-id pub-id-type="doi">10.31857/S0869-56524864514-518</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Biochemistry, biophysics, molecular biology</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Биохимия, биофизика, молекулярная биология</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">Functional comparison of short and long isoforms of the TRF2 protein in Drosophila melanogaster</article-title><trans-title-group xml:lang="ru"><trans-title>Cравнение функциональной роли короткой и длинной изоформ белка TRF2 у Drosophila melanogaster</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Osadchiy</surname><given-names>I. S.</given-names></name><name xml:lang="ru"><surname>Осадчий</surname><given-names>И. C.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>untie@mail.ru</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 Russian Academy of Sciences</p></bio><bio xml:lang="ru"><p>Академик РАН</p></bio><email>untie@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Maksimenko</surname><given-names>O. G.</given-names></name><name xml:lang="ru"><surname>Максименко</surname><given-names>О. Г.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>untie@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Institute of Gene Biology of the Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Институт биологии гена Российской академии наук</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2019-06-10" publication-format="electronic"><day>10</day><month>06</month><year>2019</year></pub-date><volume>486</volume><issue>4</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>514</fpage><lpage>518</lpage><history><date date-type="received" iso-8601-date="2019-06-27"><day>27</day><month>06</month><year>2019</year></date><date date-type="accepted" iso-8601-date="2019-06-27"><day>27</day><month>06</month><year>2019</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2019, Russian academy of sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2019, Российская академия наук</copyright-statement><copyright-year>2019</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/0869-5652/article/view/14483">https://journals.eco-vector.com/0869-5652/article/view/14483</self-uri><abstract xml:lang="en"><p>The TRF2 protein (TBP-related factor 2) can substitute for TBP in the TFIID complex forming alternative transcription initiation complexes for TATA-less promoters, including promoters of histone H1 and required for transposon repression piRNA-clusters. The Drosophila <italic>trf2</italic> gene codes for two isoforms: a “short” and a “long” one, in which the same short TRF2 sequence is preceded by a long N-terminal domain. Here, we demonstrated that the long TRF2 isoform has greater functional activity then the short isoform by expressing each of them in reduced rate under the endogenous promoters. Expression of the long isoform alone doesn't affect neither the flies` viability nor the sex ratio. Expression of the short isoform alone leads to the phenotype described for the trf2 gene insufficiency and derepression of transposable elements, that is, decreased viability, violation of homologous chromosome pairing and segregation, and apparent female-biased sex ratio.</p></abstract><trans-abstract xml:lang="ru"><p>Белок TRF2 (TBP-related factor 2) способен замещать TBP, формируя альтернативные TATA-независимые комплексы на промоторах генов, в том числе гистона H1 и репрессирующих транспозоны piwi-кластеров. Ген <italic>trf2</italic> дрозофилы кодирует две изоформы белка - короткую и длинную. В данной работе мы показали, что длинная изоформа белка TRF2 обладает большей функциональной активностью по сравнению с короткой изоформой при их сниженной экспрессии под собственными промоторами гена. При экспрессии только длинной изоформы белка самцы и самки имели нормальную выживаемость. Экспрессия только короткой изоформы приводила к значительному снижению количества самцов и нарушению сегрегации хромосом в мейозе - фенотипу, описанному при инактивации белка TRF2 и дерепрессии транспозонов.</p></trans-abstract><kwd-group xml:lang="en"><kwd>TBP-related factor 2 (TRF2)</kwd><kwd>derepression of transposons</kwd><kwd>abnormal chromosome segregation</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>TBP-related factor 2 (TRF2)</kwd><kwd>дерепрессия транспозонов</kwd><kwd>нарушение сегрегации хромосом</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="en">Russian Foundation for Basic Research</institution></institution-wrap><institution-wrap><institution xml:lang="ru">Российский фонд фундаментальных исследований</institution></institution-wrap></funding-source><award-id></award-id></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Ohler U., Liao G., Niemann H., Rubin G.M. // Genome Biol. 2002. 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