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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">ssmu</journal-id><journal-title-group><journal-title xml:lang="ru">Бюллетень сибирской медицины</journal-title><trans-title-group xml:lang="en"><trans-title>Bulletin of Siberian Medicine</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1682-0363</issn><issn pub-type="epub">1819-3684</issn><publisher><publisher-name>Siberian State Medical University, the Ministry of Healthcare of the Russian Federation</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.20538/1682-0363-2026-1-197-201</article-id><article-id custom-type="elpub" pub-id-type="custom">ssmu-6421</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>СЛУЧАЙ ИЗ КЛИНИЧЕСКОЙ ПРАКТИКИ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>CLINICAL CASES</subject></subj-group></article-categories><title-group><article-title>Несовершенный остеогенез в семье с новым вариантом в гене COL1A1  и гонадным мозаицизмом: описание клинического случая</article-title><trans-title-group xml:lang="en"><trans-title>Osteogenesis imperfecta in a family with a novel variant in the COL1A1 gene and gonadal mosaicism: a clinical case</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-1290-574X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Забудская</surname><given-names>К. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Zabudskaya</surname><given-names>K. G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Забудская Ксения Геннадьевна – врач лабораторный генетик, МГНЦ им. академика Н.П. Бочкова, г. Москва,  </p><p>Россия, 115522, г. Москва, ул. Москворечье, 1</p></bio><bio xml:lang="en"><p>1 Moskvorechye St., 115522 Moscow, Russian Federation </p></bio><email xlink:type="simple">ksenyazabudskaya@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-9715-3027</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Восканян</surname><given-names>А. Э.</given-names></name><name name-style="western" xml:lang="en"><surname>Voskanyan</surname><given-names>A. E.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Восканян Анаит Эдуардовна – врач-генетик</p><p>Россия, 115522, г. Москва, ул. Москворечье, 1</p></bio><bio xml:lang="en"><p>1 Moskvorechye St., 115522 Moscow, Russian Federation</p></bio><email xlink:type="simple">voskanyan@med-gen.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0198-2053</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Курамагомедова</surname><given-names>Р. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Kuramagomedova</surname><given-names>R. G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Курамагомедова Рабиат Газимагомедовна – врач педиатр, педиатрическое отделение врожденных и наследственных заболеваний  </p><p>Россия, 125412, г. Москва, ул. Талдомская, 2</p></bio><bio xml:lang="en"><p>2 Taldomskaya St., 125412 Moscow, Russian Federation</p></bio><email xlink:type="simple">kuramagomedova.r@pedklin.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-1285-9093</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Рыжкова</surname><given-names>О. П.</given-names></name><name name-style="western" xml:lang="en"><surname>Ryzhkova</surname><given-names>O. P.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Рыжкова Оксана Петровна – канд. мед. наук, начальник информационно-аналитического отдела, зав. лабораторией молекулярно-генетической диагностики</p><p>Россия, 115522, г. Москва, ул. Москворечье, 1</p></bio><bio xml:lang="en"><p>1 Moskvorechye St., 115522 Moscow, Russian Federation</p></bio><email xlink:type="simple">ryzhkova@dnalab.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Медико-генетический научный центр (МГНЦ) им. академика Н.П. Бочкова</institution><country>Россия</country></aff><aff xml:lang="en"><institution>N.P. Bochkov Research Center for Medical Genetics</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Научно-исследовательский клинический институт педиатрии и детской хирургии им. академика Ю.Е. Вельтищева, Российский национальный исследовательский медицинский университет (РНИМУ) им. Н.И. Пирогова</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Vetlishchev Research and Clinical Institute of Pediatrics and Pediatric Surgery, N.I. Pirogov Russian National Research Medical University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2026</year></pub-date><pub-date pub-type="epub"><day>13</day><month>04</month><year>2026</year></pub-date><volume>25</volume><issue>1</issue><fpage>197</fpage><lpage>201</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Забудская К.Г., Восканян А.Э., Курамагомедова Р.Г., Рыжкова О.П., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Забудская К.Г., Восканян А.Э., Курамагомедова Р.Г., Рыжкова О.П.</copyright-holder><copyright-holder xml:lang="en">Zabudskaya K.G., Voskanyan A.E., Kuramagomedova R.G., Ryzhkova O.P.</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://bulletin.ssmu.ru/jour/article/view/6421">https://bulletin.ssmu.ru/jour/article/view/6421</self-uri><abstract><p>Несовершенный остеогенез (НО) – генетически гетерогенное заболевание, основными клиническими проявлениями которого являются склонность к рецидивирующим патологическим переломам и прогрессирующая деформация скелета. В клинической практике встречаются случаи, когда у родителей пробанда отсутствуют явные признаки заболевания, несмотря на наличие нескольких пораженных детей, что может указывать на гонадный мозаицизм – состояние, при котором каузативный вариант присутствует только в части половых клеток родителя.Гонадный мозаицизм остается недостаточно изученным механизмом наследования моногенных заболеваний, что создает сложности в генетическом консультировании и оценке репродуктивных рисков. В случае НО этот феномен может объяснять спорадические случаи или рекуррентные рождения больных детей у клинически здоровых родителей.В статье представлен клинический случай семьи, в которой у пробанда и его младшей сестры диагностирован COL1A1-ассоциированный НО, тогда как родители и другие дети не имеют признаков заболевания. На основании клинических и генетических данных обсуждается вероятность гонадного мозаицизма у одного из родителей, а также рассматриваются вопросы дифференциальной диагностики, тактики ведения пациентов и медико-генетического консультирования семьи.Это наблюдение подчеркивает важность молекулярно-генетического тестирования не только пробанда, но и его родителей для уточнения механизма наследования и прогнозирования рисков повторных случаев заболевания в семье.</p></abstract><trans-abstract xml:lang="en"><p>Osteogenesis imperfecta (OI) is a clinically heterogeneous genetic disorder whose primary clinical manifestations include susceptibility to recurrent pathological fractures and progressive skeletal deformities. In clinical practice, cases are observed where the proband’s parents show no overt signs of the disease despite having multiple affected children. This may suggest gonadal mosaicism – a condition in which the causative variant is present only in a subset of parent’s germ cells.Gonadal mosaicism remains an understudied inheritance mechanism in monogenic diseases, complicating genetic counseling and reproductive risk assessment. In OI, this phenomenon may account for sporadic cases or recurrent births of affected children to clinically healthy parents.This article presents a case report of a family in which the proband and his younger sister were diagnosed with COL1A1-associated OI, while the parents and other children showed no disease manifestations. Based on clinical and genetic data, the likelihood of gonadal mosaicism in one parent is discussed, along with considerations for differential diagnosis, patient management strategies, and family genetic counseling.This case highlights the importance of molecular genetic testing not only for the probands but also for their parents to clarify the inheritance mechanism and predict the risks of disease recurrence in the family.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>несовершенный остеогенез</kwd><kwd>гонадный мозаицизм</kwd><kwd>COL1A1</kwd></kwd-group><kwd-group xml:lang="en"><kwd>osteogenesis imperfecta</kwd><kwd>gonadal mosaicism</kwd><kwd>COL1A1</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Chaugule S., Constantinou C.K., John A.A., Micha D., Eekhoff M., Gravallese E. et al. 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