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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">676593</article-id><article-id pub-id-type="doi">10.31857/S0016675824120046</article-id><article-id pub-id-type="edn">warncq</article-id><article-categories><subj-group subj-group-type="toc-heading"><subject>ГЕНЕТИКА РАСТЕНИЙ</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">Transcriptional Activity of <italic>CCA</italic> 1 in Northern Population <italic>Arabidopsis thaliana</italic> Plants under Altered Light Conditions</article-title><trans-title-group xml:lang="ru"><trans-title>Транскрипционная активность <italic>CCA</italic>1 у растений <italic>Arabidopsis thaliana</italic> северной популяции в условиях измененного светового режима</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Zaretskaya</surname><given-names>M. V.</given-names></name><name xml:lang="ru"><surname>Зарецкая</surname><given-names>М. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>genmg@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Fedorenko</surname><given-names>О. M.</given-names></name><name xml:lang="ru"><surname>Федоренко</surname><given-names>О. М.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>fedorenko_om@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Institute of Biology of Karelian Research Centre Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Институт биологии Карельского научного центра Российской академии наук</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2024-12-15" publication-format="electronic"><day>15</day><month>12</month><year>2024</year></pub-date><volume>60</volume><issue>12</issue><fpage>36</fpage><lpage>42</lpage><history><date date-type="received" iso-8601-date="2025-03-03"><day>03</day><month>03</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/676593">https://transsyst.ru/0016-6758/article/view/676593</self-uri><abstract xml:lang="en"><p>The dynamics of the transcriptional activity of one of the key genes of the circadian network, <italic>CCA</italic><italic>1</italic>, was analyzed under conditions of a natural light photoperiod of a long day (16L : 8D) and under an inverted light regime (8D : 16L) in <italic>A</italic><italic>. </italic><italic>thaliana</italic> plants of the northern natural population (Karelia). It has been shown that under conditions of an inverted shift in the light regime, there is a sharp increase in the expression of this gene with a phase shift in the circadian rhythm by 2 hours. The level of <italic>CCA</italic><italic>1</italic> transcriptional activity was almost two times higher compared to the natural light conditions. At the same time, the endogenous rhythm of the gene was preserved, but with a smaller amplitude. With age, 30-day-old plants grown under inverted conditions experienced a loss of endogenous <italic>CCA</italic><italic>1</italic> circadian rhythm. The results obtained allow us to conclude that the circadian rhythms of <italic>A</italic><italic>. </italic><italic>thaliana</italic>, northern natural populations, probably play an important role in adaptation to changing light conditions, and that one of the key clock genes, <italic>CCA</italic><italic>1</italic>, plays a significant role in this process.</p></abstract><trans-abstract xml:lang="ru"><p>Проанализирована динамика транскрипционной активности одного из ключевых генов циркадной сети <italic>CCA1</italic> в условиях естественного светового фотопериода длинного дня (16L : 8D) и при инвертированном световом режиме (8D : 16L) у растений <italic>A. </italic><italic>thaliana</italic> северной природной популяции (Карелия). Показано, что в условиях инвертированного смещения светового режима происходит резкий подъем экспрессии этого гена со сдвигом фазы в циркадном ритме на 2 часа. Уровень транскрипционной активности <italic>CCA1</italic> оказался почти в два раза выше по сравнению с естественными световыми условиями. При этом эндогенный ритм гена сохранялся, но с меньшей амплитудой. С возрастом у 30-дневных растений, выросших в инвертированных условиях, произошла потеря эндогенного циркадного ритма <italic>CCA1</italic>. Полученные результаты позволяют заключить, что, вероятно, циркадные ритмы <italic>A.</italic> <italic>thaliana</italic> северных природных популяций выполняют важную роль в адаптации к изменению световых условий и что один из ключевых генов часов <italic>CCA1</italic> играет в этом процессе существенную роль.</p></trans-abstract><kwd-group xml:lang="en"><kwd>Arabidopsis thaliana</kwd><kwd>northern natural populations</kwd><kwd>circadian rhythms</kwd><kwd>dynamics of CCA1 transcriptional activity</kwd><kwd>photoperiod</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>Arabidopsis thaliana</kwd><kwd>северные популяции</kwd><kwd>циркадные ритмы</kwd><kwd>транскрипционная активность CCA1</kwd><kwd>фотопериод</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Правительство РФ, госзадание КарНЦ РАН (№ темы FMEN-2022-0009)</institution></institution-wrap><institution-wrap><institution xml:lang="en">State Law Government of the Russian Federation</institution></institution-wrap></funding-source></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Zhu Z., Quint M., Anwer M.U. 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