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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">697716</article-id><article-id pub-id-type="doi">10.7868/S3034543X25050122</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">TREX-2 MRNA EXPORT COMPLEX INTERACTS WITH HLB COMPONENT FLASH AND IS RECRUITED TO PROCESSED HISTONE MRNAS</article-title><trans-title-group xml:lang="ru"><trans-title>КОМПЛЕКС ЭКСПОРТА МРНК TREX-2 ВЗАИМОДЕЙСТВУЕТ С КОМПОНЕНТОМ HLB FLASH И ПРИВЛЕКАЕТСЯ НА ПРОЦЕССИРОВАННЫЕ МРНК ГИСТОНОВ</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kurshakova</surname><given-names>M. M</given-names></name><name xml:lang="ru"><surname>Куршакова</surname><given-names>М. М</given-names></name></name-alternatives><email>kursha@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Yakusheva</surname><given-names>Y. A</given-names></name><name xml:lang="ru"><surname>Якушева</surname><given-names>Ю. А</given-names></name></name-alternatives><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><bio xml:lang="en"><p>Academician of the RAS</p></bio><bio xml:lang="ru"><p>академик РАН</p></bio><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Engelhardt Institute of Molecular Biology RAS</institution></aff><aff><institution xml:lang="ru">Институт молекулярной биологии им. В.А. Энельгердта Российской академии наук</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-10-15" publication-format="electronic"><day>15</day><month>10</month><year>2025</year></pub-date><volume>524</volume><issue>1</issue><issue-title xml:lang="en">VOL 524, NO1 (2025)</issue-title><issue-title xml:lang="ru">ТОМ 524, №1 (2025)</issue-title><fpage>564</fpage><lpage>569</lpage><history><date date-type="received" iso-8601-date="2025-12-04"><day>04</day><month>12</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><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/" start_date="2026-10-15"/></permissions><self-uri xlink:href="https://journals.eco-vector.com/2686-7389/article/view/697716">https://journals.eco-vector.com/2686-7389/article/view/697716</self-uri><abstract xml:lang="en"><p>Disruption of the normal expression of histone genes lead to the development of various pathologies. One of the key stages of gene expression is the export of mRNA from the nucleus to the cytoplasm. The TREX-2 protein complex regulates the export of the majority of poly(A)-containing mRNAs. Previously, we demonstrated that TREX-2 is also associated with histone mRNA particles and participates in the nuclear export of histone mRNAs, which lack poly(A)-tails. In this study we investigated the interaction of TREX-2 proteins with the histone mRNA processing machinery. It was shown that TREX-2 interacts with the FLASH protein, a key protein of the specialized histone mRNA processing machinery and a component of the histone locus body (HLB). The TREX-2 complex is recruited through its interaction with FLASH to processed histone mRNAs.</p></abstract><trans-abstract xml:lang="ru"><p>Белки гистоны необходимы для упаковки ДНК в клетках. Нарушения нормальной экспрессии генов гистонов вызывают развитие различных патологий. Одной из ключевых стадий экспрессии генов является экспорт мРНК из ядра в цитоплазму. Белковый комплекс TREX-2 регулирует экспорт основной части поли(A)-содержащих мРНК. Ранее мы показали, что TREX-2 также ассоциирован с мРНП частицами гистонов и участвует в ядерном экспорте мРНК гистонов, которые не содержат поли(A). В данной работе было исследовано взаимодействие белков TREX-2 с аппаратом процессинга мРНК гистонов. Показано, что TREX-2 взаимодействует с белком FLASH, субъединицей HLB тельца, ассоциированного с гистоновым локусом, ключевым компонентом специфического аппарата процессинга мРНК гистонов. TREX-2 комплекс привлекается через взаимодействие с FLASH на процессированную мРНК гистонов.</p></trans-abstract><kwd-group xml:lang="en"><kwd>FLASH</kwd><kwd>HLB</kwd><kwd>TREX-2</kwd><kwd>Xmas-2</kwd><kwd>PCID2</kwd><kwd>ENY2</kwd><kwd>ORC</kwd><kwd>mRNA export</kwd><kwd>histone genes</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>FLASH</kwd><kwd>HLB</kwd><kwd>TREX-2</kwd><kwd>Xmas-2</kwd><kwd>PCID2</kwd><kwd>ENY2</kwd><kwd>ORC</kwd><kwd>экспорт мРНК</kwd><kwd>гены гистонов</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа была выполнена при поддержке гранта PHФ № 24-24-00349.</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Durovio, R.J., Marzluff, W.F. // RNA Biology. 2017. Vol. 14. No. 6. P. 726–738.</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Geisler, M.S., Kemp, J.pp., Durovio, R.J. // Nucleus. 2023. Vol. 14. 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