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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">Medical academic journal</journal-id><journal-title-group><journal-title xml:lang="en">Medical academic journal</journal-title><trans-title-group xml:lang="ru"><trans-title>Медицинский академический журнал</trans-title></trans-title-group></journal-title-group><issn publication-format="print">1608-4101</issn><issn publication-format="electronic">2687-1378</issn><publisher><publisher-name xml:lang="en">Eco-Vector</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">693966</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Basis medicine</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Фундаментальная медицина</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">Genetic defects of the coagulation cascade and homocysteine metabolism in the development of cerebral thrombosis</article-title><trans-title-group xml:lang="ru"><trans-title>Генетические нарушения коагуляционного каскада и обмена гомоцистеина в генезе церебрального тромбоза</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Sirotkina</surname><given-names>O. V.</given-names></name><name xml:lang="ru"><surname>Сироткина</surname><given-names>О. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>shabanov@mail.rcom.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Cherkas</surname><given-names>Yu. V.</given-names></name><name xml:lang="ru"><surname>Черкас</surname><given-names>Ю. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>shabanov@mail.rcom.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Merkulova</surname><given-names>A. V.</given-names></name><name xml:lang="ru"><surname>Меркулова</surname><given-names>А. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>shabanov@mail.rcom.ru</email><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Elchaninov</surname><given-names>A. P.</given-names></name><name xml:lang="ru"><surname>Ельчанинов</surname><given-names>А. П.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>shabanov@mail.rcom.ru</email><xref ref-type="aff" rid="aff4"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Chuhlovina</surname><given-names>M. L.</given-names></name><name xml:lang="ru"><surname>Чухловина</surname><given-names>М. Л.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>shabanov@mail.rcom.ru</email><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Denisenko</surname><given-names>A. D.</given-names></name><name xml:lang="ru"><surname>Денисенко</surname><given-names>А. Д.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>shabanov@mail.rcom.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Shvarts</surname><given-names>I. E.</given-names></name><name xml:lang="ru"><surname>Шварц</surname><given-names>И. Е.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>shabanov@mail.rcom.ru</email><xref ref-type="aff" rid="aff5"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Konstantinov Institute of Nuclear Physics RAS</institution></aff><aff><institution xml:lang="ru">Петербургский институт ядерной физики им. Б.П. Константинова РАН</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Research Institute of Experimental Medicine of the Russian Academy of Medical Sciences</institution></aff><aff><institution xml:lang="ru">ГУ «Научно-исследовательский институт экспериментальной медицины РАМН»</institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">St. Peterburg Pediatric Medical Academy of the Health Care Ministry RF</institution></aff><aff><institution xml:lang="ru">ГОУ ВПО Санкт-Петербургская педиатрическая медицинская академия УН РФ</institution></aff></aff-alternatives><aff-alternatives id="aff4"><aff><institution xml:lang="en">Central Medical-Sanitary Division P122 of the St. Petersburg Research Institute of Experimental Medicine of the Russian Academy of Medical Sciences</institution></aff><aff><institution xml:lang="ru">Центральная медико-санитарная часть № 122 Санкт-Петербурга Федерального управления медико-биологических и экстремальных проблем при М3 РФ</institution></aff></aff-alternatives><aff-alternatives id="aff5"><aff><institution xml:lang="en">Federal Management of Medico-Biological and Emergency Issues HCM RF, Pavlov State Medical University HCM RF</institution></aff><aff><institution xml:lang="ru">Санкт-Петербургский государственный медицинский университет им. акад. И.П. Павлова М3 РФ</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2004-11-29" publication-format="electronic"><day>29</day><month>11</month><year>2004</year></pub-date><volume>4</volume><issue>4</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>23</fpage><lpage>28</lpage><history><date date-type="received" iso-8601-date="2025-10-21"><day>21</day><month>10</month><year>2025</year></date><date date-type="accepted" iso-8601-date="2025-10-21"><day>21</day><month>10</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2004, Eco-Vector</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2004, Эко-Вектор</copyright-statement><copyright-year>2004</copyright-year><copyright-holder xml:lang="en">Eco-Vector</copyright-holder><copyright-holder xml:lang="ru">Эко-Вектор</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/" start_date="2007-11-29"/></permissions><self-uri xlink:href="https://journals.eco-vector.com/MAJ/article/view/693966">https://journals.eco-vector.com/MAJ/article/view/693966</self-uri><abstract xml:lang="en"><p>The main goal of the present study was to evaluate the genetic impact of some genes operating in coag­ulation system in the development of the inherited predisposition to ischemic stroke (IS) in men and women before 45 year old. For this purpose we investigated the allele distribution of the 7 following genes - F V Leiden, F2 G20210A, G/A-455 FGB, GP Illa PIA1/A2, A1/A2 5’F7, 4G/5G PAI-1, C677T MTHFR. The plasma level of total homocysteine was analyzed too. The significant prevalence of T 677 MTHFR frequency in the patients with IS compared with controls was found (33% and 27%, respectively, p=0.03). The T 677 allele was associated with high plasma level of total homocysteine. The significant decrease of protective A2 5’F7 allele frequency in IS patients compared with controls was found also (9% and 13%, respectively, p=0.04). The gene-gene interaction between CT or TT genotypes of MTHFR gene and A1A1 genotype of F7 in IS group was showed (OR=1.9 Cl 95% 1.4-2.6). The allele frequencies of other investigated genes were not dif­ferent in patients and control group. These results allowed us to make a conclusion that the inherited predis­position to IS depends on mutations in MTHFR and factor VII genes.</p></abstract><trans-abstract xml:lang="ru"><p>Охарактеризовано аллельное распределение семи генетических детерминант: F V Leiden, G-455A FGB, G/A 20210 F2, А1/А2 5’F7, PI А1/А2 GP Illa, C677T MTHFR и 4G/5G PAI-1, определяющих склонность к тромбофилии, и проанализирован уровень общего гомоцистеина плазмы крови у 148 пациентов с ишемическим инсультом головного мозга, развившимся в молодом возрасте. Показано статисти­чески значимое накопление частоты встречаемости Т677 аллеля гена MTHFR, ассоциирующегося с увеличением уровня гомоцистеина, и уменьшение частоты встречаемости протективного инсерционного аллеля гена фактора VII свертывания крови у больных по сравнению с контрольной группой. Выявлено ген-генное взаимодействие между неблагоприятными с точки зрения развития артериального тромбоза генотипами вышеуказанных детерминант, которое повышает риск развития ишемического инсульта в два раза. Результаты данного исследования показывают, что генетические нарушения, увеличивающие уровень гомоцистеина и фактора VII в плазме крови, являются факторами риска развития ишемического инсульта у лиц до 45 лет.</p></trans-abstract><kwd-group xml:lang="en"><kwd>ischemic stroke</kwd><kwd>clotting factors</kwd><kwd>inherited predisposition to thrombophilia</kwd><kwd>homocisteine</kwd><kwd>MTHFR</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>ишемический инсульт</kwd><kwd>тромбофилия</kwd><kwd>факторы свертывания крови</kwd><kwd>гомоцистеин</kwd><kwd>метилентетрагидрофолат редуктаза</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Российский фонд фундаментальных исследований (грант)</institution></institution-wrap><institution-wrap><institution xml:lang="en">Russian Foundation for Basic Research (grant)</institution></institution-wrap></funding-source><award-id>02-04-49910</award-id></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Баркаган 3. 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