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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">22798</article-id><article-id pub-id-type="doi">10.22363/2313-0245-2019-23-4-381-389</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>BIOLOGY. EXPERIMENTAL PHYSIOLOGY</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>БИОЛОГИЯ. ЭКСПЕРИМЕНТАЛЬНАЯ ФИЗИОЛОГИЯ</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">Prevalence of Some Gene Polymorphisms Related to Early Pregnancy Loss among Russian Women</article-title><trans-title-group xml:lang="ru"><trans-title>Встречаемость у женщин русской национальности некоторых генных полиморфизмов, ассоциированных с ранними репродуктивными потерями</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Ahmed</surname><given-names>A. A. M.</given-names></name><name xml:lang="ru"><surname>Ахмед</surname><given-names>А. А. М.</given-names></name></name-alternatives><email>azova-mm@rudn.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Muradian</surname><given-names>A. A.</given-names></name><name xml:lang="ru"><surname>Мурадян</surname><given-names>А. А.</given-names></name></name-alternatives><email>azova-mm@rudn.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Azova</surname><given-names>M. M.</given-names></name><name xml:lang="ru"><surname>Азова</surname><given-names>М. М.</given-names></name></name-alternatives><email>azova-mm@rudn.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Peoples’ Friendship University of Russia (RUDN University)</institution></aff><aff><institution xml:lang="ru">Российский университет дружбы народов</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2019-12-15" publication-format="electronic"><day>15</day><month>12</month><year>2019</year></pub-date><volume>23</volume><issue>4</issue><issue-title xml:lang="en">VOL 23, NO4 (2019)</issue-title><issue-title xml:lang="ru">ТОМ 23, №4 (2019)</issue-title><fpage>381</fpage><lpage>389</lpage><history><date date-type="received" iso-8601-date="2020-02-03"><day>03</day><month>02</month><year>2020</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2019, Ahmed A.A., Muradian A.A., Azova M.M.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2019, Ахмед А.А., Мурадян А.А., Азова М.М.</copyright-statement><copyright-year>2019</copyright-year><copyright-holder xml:lang="en">Ahmed A.A., Muradian A.A., Azova M.M.</copyright-holder><copyright-holder xml:lang="ru">Ахмед А.А., Мурадян А.А., Азова М.М.</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/">http://creativecommons.org/licenses/by/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.rudn.ru/medicine/article/view/22798">https://journals.rudn.ru/medicine/article/view/22798</self-uri><abstract xml:lang="en"><p>Background. A variety of biological processes regulated by differential gene expression are required to maintain a normal gestation and accordingly, the mutations and polymorphisms in such genes may cause miscellaneous biological disorders that eventually result in early pregnancy loss. Many studies reported that aberrant fetal DNA methylation as well as embryonic chromosome abnormalities may lead to impairment of fetal early growth and development. Therefore, we have aimed to genotype several gene polymorphisms might be involved in the above-mentioned biological disorders to screen their prevalence in Russian population. Materials and methods. 81 Russian women without previous history of normal pregnancy or early abortion were recruited into this population study to determine the genotype and allele frequencies through genotyping using RFLP-PCR method for DNMT3B rs2424913, DNMT3B rs1569686, DNMT3A rs7590760, DNMT1 rs2228611, DNMT1 rs8101626, DNMT3L rs2276248, and DNMT3L rs2070565, allele-specific PCR for SYCP3 T657C, and real-time PCR for MTHFR rs1801133, MTHFR rs1801131, MTR rs1805087, and MTRR rs1801394. Results. Minor homozygous genotypes and minor alleles of the polymorphisms DNMT3B rs2424913 (TT: 11.1%, T: 37.05%), DNMT1 rs2228611 (GG: 18.5%, G: 40.75%), and DNMT1 rs8101626 (GG: 16.0%, G: 40.1%) were quite prevalent in Russian women and as frequent as those of the well-studied polymorphisms: MTRR rs1801394 (GG: 27.2%, G: 50.65%), MTHFR rs1801131 (CC: 17.3%, C: 40.15%), and MTHFR rs1801133 (TT: 11.1%, T: 29.0%).The heterozygous genotype of SYCP3 T657C (CT: 12.3%, T: 6.15%) was also quite frequent. Conclusion. Based on our study and literature data, we suggest that DNMT3B rs2424913, DNMT1 rs2228611, DNMT1 rs8101626, and SYCP3 T657C polymorphisms along with the common folate cycle gene polymorphisms can be potential genetic predictors for early pregnancy loss in Russian women.</p></abstract><trans-abstract xml:lang="ru"><p>Актуальность. Разнообразные биологические процессы, регулируемые дифференциальной экспрессией генов, необходимы для нормального протекания беременности, и, соответственно, мутации и полиморфизмы в таких генах могут вызывать различные нарушения, приводящие, в конечном итоге, к преждевременной потере беременности. Во многих исследованиях сообщалось, что изменения в метилировании ДНК и хромосомные мутации могут привести к аномалиям развития плода. В этой связи представленное исследование было направлено на изучение распространенности в русской популяции ряда генных полиморфизмов, которые могут быть вовлечены в развитие указанных нарушений. Материал и методы. В исследовании принимали участие женщины русской национальности без беременности в анамнезе ( n = 81). Генотипирование выполнялось методами ПЦР с последующей рестрикцией ДНК (DNMT3B rs2424913, DNMT3B rs1569686, DNMT3A rs7590760, DNMT1 rs2228611, DNMT1 rs8101626, DNMT3L rs2276248, DNMT3L rs2070565), аллель-специфичной ПЦР (SYCP3 T657C) и ПЦР в режиме реального времени (MTHFR rs1801133, MTHFR rs1801131, MTR rs1805087, MTRR rs1801394). Результаты. Минорные гомозиготные генотипы и минорные аллели по полиморфизмам DNMT3B rs2424913 (TT 11,1%, T 37,05%), DNMT1 rs2228611 (GG 18,5%, G 40,75%) и DNMT1 rs8101626 (GG 16,0%, G 40,1%) встречаются у женщин русской национальности достаточно широко, и их частота сравнима с таковой по хорошо изученным полиморфизмам MTRR rs1801394 (GG 27,2%, G 50,65%), MTHFR rs1801131 (CC 17,3%, C 40,15%) и MTHFR rs1801133 (TT11,1%, T 29,0%). Распространен также и гетерозиготный генотип по полиморфизму SYCP3 T657C (CT 12,3%, T 6,15%). Заключение. Результаты проведенных нами исследований и анализ литературных данных позволяют полагать, что генные полиморфизмы DNMT3B rs2424913, DNMT1 rs2228611, DNMT1 rs8101626 и SYCP3 T657C, наряду с хорошо изученными полиморфизмами генов фолатного цикла, могут быть использованы в качестве генетических предикторов ранних репродуктивных потерь у женщин русской национальности.</p></trans-abstract><kwd-group xml:lang="en"><kwd>gene polymorphisms</kwd><kwd>early pregnancy loss</kwd><kwd>DNA methylation</kwd><kwd>folate cycle</kwd><kwd>chromosome nondisjunction</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>генные полиморфизмы</kwd><kwd>потеря беременности на ранних сроках</kwd><kwd>метилирование ДНК</kwd><kwd>фолатный цикл</kwd><kwd>нерасхождение хромосом</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Simpson J, Carson S. Genetic and Nongenetic Causes of Pregnancy Loss. 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