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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">Biology Bulletin</journal-id><journal-title-group><journal-title xml:lang="en">Biology Bulletin</journal-title><trans-title-group xml:lang="ru"><trans-title>Известия Российской академии наук. Серия биологическая</trans-title></trans-title-group></journal-title-group><issn publication-format="print">1026-3470</issn><issn publication-format="electronic">3034-5367</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">647826</article-id><article-id pub-id-type="doi">10.31857/S1026347024060024</article-id><article-id pub-id-type="edn">ukzcgq</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>BIOCHEMISTRY</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>БИОХИМИЯ</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">Influence of different lighting and feeding regimes on the expression of the <italic>fadsd5, fadsd6, elovl2, elovl5a</italic> desaturase and elongase genes in the liver of juvenile Atlantic Salmon <italic>Salmo salar</italic> L. under aquaculture conditions</article-title><trans-title-group xml:lang="ru"><trans-title>Влияние разных режимов освещения и кормления на экспрессию генов <italic>fadsd5, fadsd6, elovl2, elovl5а</italic> десатураз и элонгаз в печени молоди атлантического лосося <italic>Salmo salar</italic> L. в условиях аквакультуры</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Khurtina</surname><given-names>S. N.</given-names></name><name xml:lang="ru"><surname>Хуртина</surname><given-names>С. Н.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Environmental Biochemistry Laboratory, Institute of Biology</p></bio><bio xml:lang="ru"><p>Институт биологии</p></bio><email>pek-svetlana@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Murzina</surname><given-names>S. А.</given-names></name><name xml:lang="ru"><surname>Мурзина</surname><given-names>С. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Environmental Biochemistry Laboratory, Institute of Biology</p></bio><bio xml:lang="ru"><p>Институт биологии</p></bio><email>pek-svetlana@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kuznetsova</surname><given-names>М. V.</given-names></name><name xml:lang="ru"><surname>Кузнецова</surname><given-names>М. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Environmental Biochemistry Laboratory, Institute of Biology</p></bio><bio xml:lang="ru"><p>Институт биологии</p></bio><email>pek-svetlana@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Nemova</surname><given-names>N. N.</given-names></name><name xml:lang="ru"><surname>Немова</surname><given-names>Н. Н.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Environmental Biochemistry Laboratory, Institute of Biology</p></bio><bio xml:lang="ru"><p>Институт биологии</p></bio><email>pek-svetlana@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Karelian Research Centre oof the Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Федеральное государственное бюджетное учреждение науки Федеральный исследовательский центр “Карельский научный центр Российской академии наук”</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2024-12-26" publication-format="electronic"><day>26</day><month>12</month><year>2024</year></pub-date><issue>6</issue><fpage>695</fpage><lpage>704</lpage><history><date date-type="received" iso-8601-date="2025-01-28"><day>28</day><month>01</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://medjrf.com/1026-3470/article/view/647826">https://medjrf.com/1026-3470/article/view/647826</self-uri><abstract xml:lang="en"><p>The relative gene expression of enzymes – desaturases and elongases (fadsd5, fadsd6, elovl2, elovl5a, elovl4), which play a key role in the biosynthesis of long-chain polyunsaturated fatty acids, was studied in the liver of juvenile Atlantic salmon <italic>Salmo salar</italic> Linnaeus, 1758, reared under different lighting and feeding regimes in aquaculture conditions. The expression level of the <italic>fadsd5</italic> desaturase gene was higher in Atlantic salmon smolts (0+), reared under round-the-clock lighting and feeding regime, compared to smolts from experimental group with natural photoperiod and daylight feeding. Changes in the level of gene expression (<italic>elovl2, elovl5a, fadsd5</italic>) in juvenile <italic>Salmo salar</italic> reflect adaptive processes at the molecular genetic level during the growth and development of fish and in response to changes in environmental conditions. The obtained results make it possible to assess the ability/requirement to the biosynthesis of PUFAs in juvenile salmon during its growth and development.</p></abstract><trans-abstract xml:lang="ru"><p>Проведен анализ относительного уровня экспрессии генов ферментов – десатураз и элонгаз (<italic>fadsd5</italic>, <italic>fadsd6</italic>, <italic>elovl2</italic>, <italic>elovl5a, elovl4</italic>), являющихся ключевыми в биосинтезе длинноцепочечных полиненасыщенных жирных кислот, в печени молоди атлантического лосося <italic>Salmo salar</italic> Linnaeus, 1758, содержащегося при разных режимах освещения и кормления в условиях аквакультуры. Установлено, что в марте у смолтов атлантического лосося (0+), выращиваемых при круглосуточном освещении и кормлении, уровень экспрессии гена <italic>fadsd5 </italic>десатуразы был выше, чем у рыб, содержащихся при естественном режиме освещения и кормлении в светлое время суток. Изменения в экспрессии генов (<italic>elovl2, elovl5a, fadsd5) </italic>у<italic> </italic>молоди лосося отражают адаптивные процессы на молекулярно-генетическом уровне в процессе роста и развития рыб и в ответ на изменения условий окружающей среды. Полученные результаты позволяют оценить способность/потребность молоди лосося к биосинтезу ПНЖК в процессе роста и развития.</p></trans-abstract><kwd-group xml:lang="en"><kwd>Atlantic salmon</kwd><kwd>gene expression</kwd><kwd>desaturases</kwd><kwd>elongases</kwd><kwd>fatty acids</kwd><kwd>smoltification</kwd><kwd>early development</kwd><kwd>aquaculture</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>атлантический лосось</kwd><kwd>экспрессия генов</kwd><kwd>десатуразы</kwd><kwd>элонгазы</kwd><kwd>жирные кислоты</kwd><kwd>смолтификация</kwd><kwd>раннее развитие</kwd><kwd>аквакультура</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>19-14-00081</award-id></award-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Министерство науки и высшего образования Российской Федерациии</institution></institution-wrap><institution-wrap><institution xml:lang="en">Ministry of Science and Higher Education of the Russian Federation</institution></institution-wrap></funding-source><award-id>075-01637-22-00</award-id></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Власов В. 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