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<article article-type="research-article" dtd-version="1.3" 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" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">oncotomsk</journal-id><journal-title-group><journal-title xml:lang="ru">Сибирский онкологический журнал</journal-title><trans-title-group xml:lang="en"><trans-title>Siberian journal of oncology</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1814-4861</issn><issn pub-type="epub">2312-3168</issn><publisher><publisher-name>Tomsk National Research Medical Сепtеr of the Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.21294/1814-4861-2026-25-1-46-53</article-id><article-id custom-type="elpub" pub-id-type="custom">oncotomsk-4108</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ЛАБОРАТОРНЫЕ И ЭКСПЕРИМЕНТАЛЬНЫЕ ИССЛЕДОВАНИЯ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>LABORATORY AND EXPERIMENTAL STUDIES</subject></subj-group></article-categories><title-group><article-title>Изучение функциональной значимости конфликтного варианта гена RAD51D при раке молочной железы</article-title><trans-title-group xml:lang="en"><trans-title>Functional analysis of the RAD51D gene conficting variant in breast cancer</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-1475-1185</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Молоков</surname><given-names>А. Ю.</given-names></name><name name-style="western" xml:lang="en"><surname>Molokov</surname><given-names>A. Yu.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Молоков Алексей Юрьевич, младший научный сотрудник лаборатории молекулярной онкологии и иммунологии Researcher ID (WOS): AAF-7302-2021. Author ID (Scopus): 57217493727.</p><p>634009, г. Томск, пер. Кооперативный, 5</p></bio><bio xml:lang="en"><p>Aleksey Yu. Molokov, Junior Researcher, Laboratory of Molecular Oncology and Immunology Researcher ID (WOS): AAF-7302-2021. Author ID (Scopus): 57217493727.</p><p>5, Kooperativny St., Tomsk, 634009</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0051-8814</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Гервас</surname><given-names>П. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Gervas</surname><given-names>P. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Гервас Полина Анатольевна, кандидат медицинских наук, научный сотрудник лаборатории молекулярной онкологии и иммунологии; доцент Researcher ID (WOS): C-5846-2012. Author ID (Scopus): 13613767400.</p><p>634009, г. Томск, пер. Кооперативный, 5;634050, г. Томск, пр. Ленина, 36</p></bio><bio xml:lang="en"><p>Polina A. Gervas, MD, PhD, Researcher, Laboratory of Molecular Oncology and Immunology; Associate Professor Researcher ID (WOS): C-5846-2012. Author ID (Scopus): 13613767400 </p><p>5, Kooperativny St., Tomsk, 634009;36, Lenin Ave., Tomsk, 634050</p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0001-2445-0124</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Коллантай</surname><given-names>О. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Kollantay</surname><given-names>O. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Коллантай Олеся Вадимовна, младший научный сотрудник лаборатории молекулярной онкологии и иммунологии </p><p>634009, г. Томск, пер. Кооперативный, 5</p></bio><bio xml:lang="en"><p>Olesya V. Kollantay, Junior Researcher, Laboratory of Molecular Oncology and Immunology </p><p>5, Kooperativny St., Tomsk, 634009</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Дударь</surname><given-names>Г. Е.</given-names></name><name name-style="western" xml:lang="en"><surname>Dudar</surname><given-names>G. E.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Дударь Глеб Евгеньевич, студент медико-биологического факультета </p><p>634050, г. Томск, Московский тракт, 2</p></bio><bio xml:lang="en"><p>Gleb E. Dudar, Student, Department of Biomedicine </p><p>2, Moskovsky trakt, Tomsk, 634050</p></bio><xref ref-type="aff" rid="aff-3"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-9030-9172</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Ванг</surname><given-names>Л.</given-names></name><name name-style="western" xml:lang="en"><surname>Wang</surname><given-names>L.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ванг Ляньхуэй, PhD, почетный профессор, Государственная ключевая лаборатория гибкой электроники (LoFE) и Институт передовых материалов (IAM), Цзянсуская ключевая лаборатория интеллектуальных биоматериалов и тераностических технологий </p><p>210023, г. Нанкин, ул. Вэньюань, 9</p></bio><bio xml:lang="en"><p>Lianhui Wang, PhD, Distinguished Professor, State Key Laboratory of Flexible Electronics (LoFE) &amp; Institute of Advanced Materials (IAM), Jiangsu Key Laboratory of Smart Biomaterials and Theranostic Technology </p><p>9, Wenyuan St., Nanjing, 210023</p></bio><xref ref-type="aff" rid="aff-4"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-0676-9799</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Хуан</surname><given-names>Ч.</given-names></name><name name-style="western" xml:lang="en"><surname>Huang</surname><given-names>Zh.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Хуан Чжушэн, PhD, доцент, Государственная ключевая лаборатория гибкой электроники (LoFE) и Институт передовых материалов (IAM), Цзянсуская ключевая лаборатория интеллектуальных биоматериалов и тераностических технологий </p><p>210023, г. Нанкин, ул. Вэньюань, 9</p></bio><bio xml:lang="en"><p>Zhusheng Huang, PhD, Associate Professor, State Key Laboratory of Flexible Electronics (LoFE) &amp; Institute of Advanced Materials (IAM), Jiangsu Key Laboratory of Smart Biomaterials and Theranostic Technology </p><p>9, Wenyuan St., Nanjing, 210023</p></bio><xref ref-type="aff" rid="aff-4"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-3651-0665</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Чойнзонов</surname><given-names>Е. Л.</given-names></name><name name-style="western" xml:lang="en"><surname>Choynzonov</surname><given-names>E. L.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Чойнзонов Евгений Лхамацыренович, доктор медицинских наук, профессор, академик РАН, директор Researcher ID (WOS): P-1470-2014. Author ID (Scopus): 6603352329 </p><p>634009, г. Томск, пер. Кооперативный, 5</p></bio><bio xml:lang="en"><p>Evgeny L. Choynzonov, MD, DSc, Professor, Academician of the Russian Academy of Sciences, Director Researcher ID (WOS): P-1470-2014. Author ID (Scopus): 6603352329.</p><p>5, Kooperativny St., Tomsk, 634009</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-1526-9013</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Чердынцева</surname><given-names>Н. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Cherdyntseva</surname><given-names>N. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Чердынцева Надежда Викторовна, доктор биологических наук, профессор, член-корреспондент РАН, заведующая лабораторией молекулярной онкологии и иммунологии Researcher ID (WOS): C-7943-2012. Author ID (Scopus): 6603911744 </p><p>634009, г. Томск, пер. Кооперативный, 5</p></bio><bio xml:lang="en"><p>Nadezda V. Cherdyntseva, DSc, Professor, Corresponding Member of the Russian Academy of Sciences, Head of the Laboratory of Molecular Oncology and Immunology Researcher ID (WOS): C-7943-2012. Author ID (Scopus): 6603911744.</p><p>5, Kooperativny St., Tomsk, 634009</p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Научно-исследовательский институт онкологии, Томский национальный исследовательский медицинский центр Российской академии наук</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Cancer Research Institute, Tomsk National Research Medical Center, Russian Academy of Sciences</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Научно-исследовательский институт онкологии, Томский национальный исследовательский медицинский центр Российской академии наук;&#13;
Томский государственный университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Cancer Research Institute, Tomsk National Research Medical Center, Russian Academy of Sciences;&#13;
Tomsk State University</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-3"><aff xml:lang="ru"><institution>Сибирский государственный медицинский университет Минздрава России</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Siberian State Medical University, Ministry of Health of Russia</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-4"><aff xml:lang="ru"><institution>Институт химии и наук о жизни, Нанкинский университет почты и телекоммуникаций</institution><country>Китай</country></aff><aff xml:lang="en"><institution>School of Chemistry and Life Sciences, Nanjing University of Posts and Telecommunications</institution><country>China</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2026</year></pub-date><pub-date pub-type="epub"><day>07</day><month>04</month><year>2026</year></pub-date><volume>25</volume><issue>1</issue><fpage>46</fpage><lpage>53</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Молоков А.Ю., Гервас П.А., Коллантай О.В., Дударь Г.Е., Ванг Л., Хуан Ч., Чойнзонов Е.Л., Чердынцева Н.В., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Молоков А.Ю., Гервас П.А., Коллантай О.В., Дударь Г.Е., Ванг Л., Хуан Ч., Чойнзонов Е.Л., Чердынцева Н.В.</copyright-holder><copyright-holder xml:lang="en">Molokov A.Y., Gervas P.A., Kollantay O.V., Dudar G.E., Wang L., Huang Z., Choynzonov E.L., Cherdyntseva N.V.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.siboncoj.ru/jour/article/view/4108">https://www.siboncoj.ru/jour/article/view/4108</self-uri><abstract><p>Патогенные мутации в генах репарации ДНК (таких как BRCA1/2, RAD50, RAD51D, PTEN и др.) ответственны за развитие наследственного рака молочной железы и яичников. Большое количество вариантов, выявляемых с помощью технологии NGS, имеют неизвестное или конфликтное клиническое значение. Реклассификация данных вариантов играет решающую роль в рутинной лабораторной практике. Целью исследования явилась реклассификация варианта конфликтного значения гена RAD51D (rs145309168), обнаруженного у молодой пациентки бурятского происхождения с раком молочной железы, с использованием нонсенс-опосредованного распада мРНК (NMD) с последующим секвенированием по Сэнгеру. Материал и методы. Полноэкзомное секвенирование (WES) было выполнено на ДНК, выделенной из цельной крови 16 пациенток с раком молочной железы бурятского этноса, у которых отсутствовали мутации в генах BRCA1/2 (данные не представлены). Диагноз пациенток подтвержден морфологически (T1–3N0–2M0). У всех обследованных женщин был диагностирован инвазивный (протоковый) рак молочной железы неспецифического типа. Патогенные варианты, ассоциированные с заболеванием, не выявлены. Далее были проанализированы редкие варианты (MAF&lt;0,005) для оценки их влияния на сплайсинг РНК с использованием биоинформатических инструментов, таких как SpliceAI, ESEFinder, RESCUE-ESE и EX-SKIP. Редкий миссенс-вариант в гене RAD51D (rs145309168) был идентифицирован у 39-летней пациентки бурятского этноса с раком молочной железы. Замороженные лейкоциты этой пациентки были разделены на две группы: экспериментальную и контрольную. Образцы культивировали в течение 5–6 дней и обрабатывали пуромицином (только экспериментальную группу) в течение 4–6 ч перед выделением РНК для предотвращения NMD с последующим секвенированием по Сэнгеру. Результаты. In vitro эксперименты проводились на живых лейкоцитах пациентки с раком молочной железы, имеющей вариант c.932T&gt;A гена RAD51D. Ампликоны кДНК были получены из РНК, выделенной из контрольных и экспериментальных лейкоцитов (обработанных пуромицином для предотвращения деградации, опосредованной NMD). Для точной оценки аберраций сплайсинга транскрипты экспериментальных лейкоцитов сравнивались с транскриптами контрольных культур лейкоцитов с помощью секвенирования по Сэнгеру. Последовательности транскриптов кДНК сравниваемых образцов в обоих случаях сохраняют изучаемый вариант, что указывает на то, что вариант не активирует NMD и, следовательно, не влияет на сплайсинг. Заключение. В данном исследовании впервые представлен in vitro анализ варианта RAD51D (rs145309168), найденного у молодой пациентки бурятского этноса с раком молочной железы. Наши экспериментальные данные демонстрируют, что вариант c.932T&gt;A не нарушает нормальный сплайсинг, что служит основанием для реклассификации данного «Конфликтного варианта» на «Вероятно доброкачественный», что согласуется с литературными данными и данными ранних классификаций.</p></abstract><trans-abstract xml:lang="en"><p>Germline pathogenic variants in DNA repair genes (BRCA1/2, RAD50, RAD51D, PTEN and etc.) are responsible for the development of hereditary breast and ovarian cancers. The large number of variants detected by NGS technology have unknown or conficting clinical signifcance. Reclassifcation of these variants plays a crucial role in their application in routine laboratory practice. The aim of the current study was to reclassify conficting RAD51D gene variant (rs145309168) in a young Buryat breast cancer patient using the translation-dependent nonsense-mediated mRNA decay (NMD) pathway. Material and Methods. Wholeexome sequencing (WES) was performed in the germline DNA of 16 non-BRCA BC Buryat patients (data not shown). The diagnosis in all patients was confrmed morphologically (T1–3N0–2M0). All tested women were diagnosed with invasive (ductal) carcinoma of no special type. Rare variants (MAF&lt;0.005) were analyzed to assess their impact on the RNA splicing using in silico tools like SpliceAI, ESEFinder, RESCUE-ESE, and EX-SKIP. A rare missense variant in the RAD51D gene (rs145309168) was identifed in a 39-year-old Buryat breast cancer patient. Frozen patient leukocytes were divided into experimental and control samples. The samples were cultured for 5–6 days and treated with puromycin (only experimental samples) for 4–6 hours prior to RNA isolation to avoid NMD followed by Sanger sequencing. Results. In vitro experiments on live leukocytes from a breast cancer patient with the c.932T&gt;A variant of the RAD51D gene were conducted. cDNA amplicons were obtained from RNA isolated from control and experimental leukocytes (treated with puromycin to avoid nonsense-mediated decay). For an accurate assessment of splicing aberrations, transcripts from the experimental leukocytes were compared to transcripts from control leukocytes by using Sanger sequencing. In both cases, the presence of the studied variant in the RNA signifed that the variant did not activate NMD and therefore did not affect splicing. Conclusion. This study presents the frst in vitro functional analysis of the RAD51D variant (rs145309168) identifed in a young Buryat breast cancer patient. Our experimental data demonstrate that this variant does not disrupt normal splicing, providing evidence for its reclassifcation as «Likely Benign», which is consistent with published data and previous classifcations.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>мРНК</kwd><kwd>ген репарации ДНК</kwd><kwd>RAD51D</kwd><kwd>рак молочной железы</kwd><kwd>этнические группы</kwd><kwd>буряты</kwd><kwd>неевропеоиды</kwd></kwd-group><kwd-group xml:lang="en"><kwd>mRNA</kwd><kwd>DNA repair gene</kwd><kwd>RAD51D</kwd><kwd>breast cancer</kwd><kwd>ethnic groups</kwd><kwd>Buryat</kwd><kwd>non-Caucasian</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследование выполнено при финансовой поддержке РНФ, проект № 24-25-00287.</funding-statement><funding-statement xml:lang="en">The reported study was funded by Russian Science Foundation according to research project 24-25-00287.</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Godet I., Gilkes D.M. 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