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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">RUDN Journal of Medicine</journal-id><journal-title-group><journal-title xml:lang="en">RUDN Journal of Medicine</journal-title><trans-title-group xml:lang="ru"><trans-title>Вестник Российского университета дружбы народов. Серия: Медицина</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2313-0245</issn><issn publication-format="electronic">2313-0261</issn><publisher><publisher-name xml:lang="en">Peoples’ Friendship University of Russia named after Patrice Lumumba (RUDN University)</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">47648</article-id><article-id pub-id-type="doi">10.22363/2313-0245-2025-29-4-470-479</article-id><article-id pub-id-type="edn">AELILG</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>MEDICAL GENETICS</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>МЕДИЦИНСКАЯ 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">A familial case of Marfan syndrome: a novel variant in the FBN1 gene</article-title><trans-title-group xml:lang="ru"><trans-title>Семейный случай синдрома Марфана: новый вариант в гене FBN1</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0004-3030-4272</contrib-id><name-alternatives><name xml:lang="en"><surname>Stepanenko</surname><given-names>Vsevolod I.</given-names></name><name xml:lang="ru"><surname>Степаненко</surname><given-names>В. И.</given-names></name></name-alternatives><email>vsevolod.stepanenko@medgenetics.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-6848-7749</contrib-id><contrib-id contrib-id-type="spin">9882-3730</contrib-id><name-alternatives><name xml:lang="en"><surname>Zhalsanova</surname><given-names>Irina Z.H.</given-names></name><name xml:lang="ru"><surname>Жалсанова</surname><given-names>И. Ж.</given-names></name></name-alternatives><email>vsevolod.stepanenko@medgenetics.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-1338-5451</contrib-id><contrib-id contrib-id-type="spin">5198-9456</contrib-id><name-alternatives><name xml:lang="en"><surname>Fonova</surname><given-names>Elizaveta A.</given-names></name><name xml:lang="ru"><surname>Фонова</surname><given-names>Е. А.</given-names></name></name-alternatives><email>vsevolod.stepanenko@medgenetics.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0004-3444-9460</contrib-id><name-alternatives><name xml:lang="en"><surname>Erburova</surname><given-names>Daria N.</given-names></name><name xml:lang="ru"><surname>Ербурова</surname><given-names>Д. Н.</given-names></name></name-alternatives><email>vsevolod.stepanenko@medgenetics.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0009-6823-9441</contrib-id><contrib-id contrib-id-type="spin">5985-1705</contrib-id><name-alternatives><name xml:lang="en"><surname>Gosudarkina</surname><given-names>Sofia N.</given-names></name><name xml:lang="ru"><surname>Государкина</surname><given-names>С. Н.</given-names></name></name-alternatives><email>vsevolod.stepanenko@medgenetics.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="spin">1806-8157</contrib-id><name-alternatives><name xml:lang="en"><surname>Ravzhaeva</surname><given-names>Ekaterina G.</given-names></name><name xml:lang="ru"><surname>Равжаева</surname><given-names>Е. Г.</given-names></name></name-alternatives><email>vsevolod.stepanenko@medgenetics.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Fadyushina</surname><given-names>Svetlana V.</given-names></name><name xml:lang="ru"><surname>Фадюшина</surname><given-names>С. В.</given-names></name></name-alternatives><email>vsevolod.stepanenko@medgenetics.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Nikitina</surname><given-names>Anastasiya A.</given-names></name><name xml:lang="ru"><surname>Никитина</surname><given-names>А. А.</given-names></name></name-alternatives><email>vsevolod.stepanenko@medgenetics.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-8421-1416</contrib-id><contrib-id contrib-id-type="spin">7393-7228</contrib-id><name-alternatives><name xml:lang="en"><surname>Seitova</surname><given-names>Gulnara N.</given-names></name><name xml:lang="ru"><surname>Сеитова</surname><given-names>Г. Н.</given-names></name></name-alternatives><email>vsevolod.stepanenko@medgenetics.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Klimchuk</surname><given-names>Olesya I.</given-names></name><name xml:lang="ru"><surname>Климчук</surname><given-names>О. И.</given-names></name></name-alternatives><email>vsevolod.stepanenko@medgenetics.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-5166-331X</contrib-id><contrib-id contrib-id-type="spin">1893-5292</contrib-id><name-alternatives><name xml:lang="en"><surname>Stepanov</surname><given-names>Vadim A.</given-names></name><name xml:lang="ru"><surname>Степанов</surname><given-names>В. А.</given-names></name></name-alternatives><email>vsevolod.stepanenko@medgenetics.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-2491-3141</contrib-id><contrib-id contrib-id-type="spin">3416-4105</contrib-id><name-alternatives><name xml:lang="en"><surname>Skryabin</surname><given-names>Nikolay A.</given-names></name><name xml:lang="ru"><surname>Скрябин</surname><given-names>Н. А.</given-names></name></name-alternatives><email>vsevolod.stepanenko@medgenetics.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Research Institute of Medical Genetics, Tomsk National Research Medical Center of the Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Научно-исследовательский институт медицинской генетики, Томский национальный исследовательский медицинский центр Российской академии наук</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">LLC Biotech Campus</institution></aff><aff><institution xml:lang="ru">ООО Биотехнологический кампус</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-12-18" publication-format="electronic"><day>18</day><month>12</month><year>2025</year></pub-date><volume>29</volume><issue>4</issue><issue-title xml:lang="en">MEDICAL GENETICS</issue-title><issue-title xml:lang="ru">МЕДИЦИНСКАЯ ГЕНЕТИКА</issue-title><fpage>470</fpage><lpage>479</lpage><history><date date-type="received" iso-8601-date="2025-12-17"><day>17</day><month>12</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Stepanenko V.I., Zhalsanova I.Z., Fonova E.A., Erburova D.N., Gosudarkina S.N., Ravzhaeva E.G., Fadyushina S.V., Nikitina A.A., Seitova G.N., Klimchuk O.I., Stepanov V.A., Skryabin N.A.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Степаненко В.И., Жалсанова И.Ж., Фонова Е.А., Ербурова Д.Н., Государкина С.Н., Равжаева Е.Г., Фадюшина С.В., Никитина А.А., Сеитова Г.Н., Климчук О.И., Степанов В.А., Скрябин Н.А.</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Stepanenko V.I., Zhalsanova I.Z., Fonova E.A., Erburova D.N., Gosudarkina S.N., Ravzhaeva E.G., Fadyushina S.V., Nikitina A.A., Seitova G.N., Klimchuk O.I., Stepanov V.A., Skryabin N.A.</copyright-holder><copyright-holder xml:lang="ru">Степаненко В.И., Жалсанова И.Ж., Фонова Е.А., Ербурова Д.Н., Государкина С.Н., Равжаева Е.Г., Фадюшина С.В., Никитина А.А., Сеитова Г.Н., Климчук О.И., Степанов В.А., Скрябин Н.А.</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://creativecommons.org/licenses/by-nc/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.rudn.ru/medicine/article/view/47648">https://journals.rudn.ru/medicine/article/view/47648</self-uri><abstract xml:lang="en"><p>Marfan syndrome is a hereditary connective tissue disorder characterized by marked pleiotropy and clinical variability. The main disease manifestations involve three systems: skeletal, ocular, and cardiovascular. The condition is caused by pathogenic variants in the FBN1 gene, which encodes fibrillin-1, a protein essential for the formation and maintenance of the extracellular matrix. This article describes a familial case (the proband and his father) with clinical manifestations of Marfan syndrome. Whole-genome sequencing of the proband and his father revealed a previously unreported variant, c.5782T&gt;A, p.(Cys1928Ser), in the FBN1 gene. Thus, a molecular genetic diagnosis of Marfan syndrome was established by identifying this novel pathogenic variant. Conclusion. A confirmed diagnosis at both the clinical and molecular genetic levels in both patients determines the further therapeutic strategy and enables timely primary and secondary disease prevention within the family.</p></abstract><trans-abstract xml:lang="ru"><p>Синдром Марфана - наследственное заболевание соединительной ткани, характеризующееся ярко выраженным плейотропизмом и клинической вариабельностью. Основные проявления заболевания затрагивают три системы: скелетную, зрительную и сердечно-сосудистую. Причиной заболевания являются патогенетически значимые варианты гена, отвечающего за синтез белка фибриллин-1, который играет ключевую роль в формировании и поддержании структуры соединительной ткани (fibrillin-1 gene, FBN1). B данной статье мы описываем семейный случай (пробанд и его отец) с клиническими проявлениями синдрома Марфана. В результате секвенирования полного генома пробанда и отца был выявлен ранее не описанный вариант нуклеотидной последовательности с. 5782Т&gt;А, р.(Cys1928Ser) в гене FBN1 в гетерозиготном состоянии. Таким образом, был установлен молекулярно-генетический диагноз синдром Марфана, путем обнаружения нового патогенного варианта в гене FBN1. Выводы. Постановка диагноза на клиническом и молекулярно-генетическом уровне у обоих пациентов определяет дальнейшую терапевтическую тактику и открывает возможности для своевременной первичной и вторичной профилактики заболевания в семье.</p></trans-abstract><kwd-group xml:lang="en"><kwd>Marfan syndrome</kwd><kwd>FBN1</kwd><kwd>hereditary connective tissue disorders</kwd><kwd>next-generation sequencing</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>синдром Марфана</kwd><kwd>FBN1</kwd><kwd>наследственные заболевания соединительной ткани</kwd><kwd>секвенирование нового поколения</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Работа выполнена в рамках государственного задания Министерства науки и высшего образования РФ № 075-00490-25-04 (Регистрационный номер темы 125042105351-3).</institution></institution-wrap><institution-wrap><institution xml:lang="en">The study was carried out according to the state assignment of the Ministry of Science and Higher Education of the Russian Federation № 075–00490–25–04 (Registration number 125042105351–3).</institution></institution-wrap></funding-source></award-group></funding-group></article-meta><fn-group/></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Chiu HH, Wu MH, Chen HC, Kao FY, Huang SK. 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