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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">medgen</journal-id><journal-title-group><journal-title xml:lang="ru">Медицинская генетика</journal-title><trans-title-group xml:lang="en"><trans-title>Medical Genetics</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2073-7998</issn><publisher><publisher-name>Publishing House «Genius Media» LLC</publisher-name></publisher></journal-meta><article-meta><article-id custom-type="elpub" pub-id-type="custom">medgen-244</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>ОРИГИНАЛЬНЫЕ ИССЛЕДОВАНИЯ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>ORIGINAL RESEARCH</subject></subj-group></article-categories><title-group><article-title>Вклад полиморфных вариантов генов фолатного цикла в цитогенетическую нестабильность клеток крови больных раком легкого</article-title><trans-title-group xml:lang="en"><trans-title>Association of polymorphism of folate metabolism genes and chromosomal aberrations in blood cells of lung cancer patients</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Баканова</surname><given-names>М. Л.</given-names></name><name name-style="western" xml:lang="en"><surname>Bakanova</surname><given-names>M. L.</given-names></name></name-alternatives><email xlink:type="simple">mari-bakano@ya.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Соболева</surname><given-names>О. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Soboleva</surname><given-names>O. A.</given-names></name></name-alternatives><email xlink:type="simple">noemail@neicon.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Минина</surname><given-names>В. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Minina</surname><given-names>V. I.</given-names></name></name-alternatives><email xlink:type="simple">noemail@neicon.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Савченко</surname><given-names>Я. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Savchenko</surname><given-names>Ya. A.</given-names></name></name-alternatives><email xlink:type="simple">noemail@neicon.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Рыжкова</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Ryzhkova</surname><given-names>A. V.</given-names></name></name-alternatives><email xlink:type="simple">noemail@neicon.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Титов</surname><given-names>Р. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Titov</surname><given-names>R. A.</given-names></name></name-alternatives><email xlink:type="simple">noemail@neicon.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Титов</surname><given-names>В. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Titov</surname><given-names>V. A.</given-names></name></name-alternatives><email xlink:type="simple">noemail@neicon.ru</email><xref ref-type="aff" rid="aff-3"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Боярских</surname><given-names>У. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Boyarskih</surname><given-names>U. A.</given-names></name></name-alternatives><email xlink:type="simple">noemail@neicon.ru</email><xref ref-type="aff" rid="aff-4"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Воронина</surname><given-names>Е. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Voronina</surname><given-names>E. N.</given-names></name></name-alternatives><email xlink:type="simple">noemail@neicon.ru</email><xref ref-type="aff" rid="aff-4"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Глушков</surname><given-names>А. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Glushkov</surname><given-names>A. N.</given-names></name></name-alternatives><email xlink:type="simple">noemail@neicon.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>«Федеральный исследовательский центр угля и углехимии Сибирского отделения Российской академии наук»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>The Federal Research Center of Coal and Coal Chemistry of Siberian Branch of the Russian Academy of Sciences</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>«Федеральный исследовательский центр угля и углехимии Сибирского отделения Российской академии наук»; Кемеровский государственный университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>The Federal Research Center of Coal and Coal Chemistry of Siberian Branch of the Russian Academy of Sciences; Kemerovo State University</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-3"><aff xml:lang="ru"><institution>ГБУЗ Кемеровской области "Областной клинический онкологический диспансер"</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Kemerovo Regional Clinical Oncological Dispensary</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-4"><aff xml:lang="ru"><institution>Институт химической биологии и фундаментальной медицины Сибирского отделения Российской академии наук</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Institute of Chemical Biology and Fundamental Medicine, Siberian Branch, Russian Academy of Sciences</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2017</year></pub-date><pub-date pub-type="epub"><day>19</day><month>09</month><year>2017</year></pub-date><volume>16</volume><issue>3</issue><fpage>12</fpage><lpage>19</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Баканова М.Л., Соболева О.А., Минина В.И., Савченко Я.А., Рыжкова А.В., Титов Р.А., Титов В.А., Боярских У.А., Воронина Е.Н., Глушков А.Н., 2017</copyright-statement><copyright-year>2017</copyright-year><copyright-holder xml:lang="ru">Баканова М.Л., Соболева О.А., Минина В.И., Савченко Я.А., Рыжкова А.В., Титов Р.А., Титов В.А., Боярских У.А., Воронина Е.Н., Глушков А.Н.</copyright-holder><copyright-holder xml:lang="en">Bakanova M.L., Soboleva O.A., Minina V.I., Savchenko Y.A., Ryzhkova A.V., Titov R.A., Titov V.A., Boyarskih U.A., Voronina E.N., Glushkov A.N.</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.medgen-journal.ru/jour/article/view/244">https://www.medgen-journal.ru/jour/article/view/244</self-uri><abstract><p>Объектом исследования являлись 338 жителей Кемеровской области, подобранные по принципу «случай-контроль» с учетом возраста, пола, этнической принадлежности и статуса курения. Были сформированы две группы: 1) 163 чел., первично обратившиеся для диагностики и лечения в Кемеровский областной онкологический диспансер (диагноз рак легкого (РЛ) устанавливался специалистами областного онкологического диспансера после проведенного обследования); 2) 175 чел. - здоровые доноры Кемеровского областного центра крови, которые составили группу сравнения. Все обследованные - русские мужчины старше 40 лет, курильщики. Целью данного исследования стал сравнительный анализ полиморфных вариантов генов фолатного цикла и частоты хромосомных аберраций у больных РЛ и индивидов, не имеющих онкологических заболеваний, проживающих в той же местности. Исследование осуществляли с использованием 1) стандартного полумикрометода культивирования лимфоцитов крови для получения препаратов хромосом и дальнейшего анализа хромосомных аберраций, 2) полимеразной цепной реакции синтеза ДНК в режиме реального времени (TaqMan assay) для изучения полиморфных вариантов генов MTHFR C677T, MTR A2756G и MTRR А66G. Статистическая обработка материала проводилась с использованием методов непараметрической статистики (Mann-Whitney U Test для парных сравнений количественных признаков), логистической регрессии (для выявления ассоциации полиморфных локусов в различных моделях (аддитивной, доминантной, сверхдоминантой, рецессивной, лог-аддитивной) с учетом количественных и бинарных признаков), метода Multifactor Dimensionality Reduction (для исследования межгенных взаимодействий). Установлено, что у больных РЛ статистически значимо чаще, чем в контрольной группе, регистрировались клетки крови с хромосомными аберрациями как хроматидного, так и хромосомного типов. Наиболее высокая частота аберраций хромосомного типа регистрировалась у больных РЛ - обладателей минорных вариантов гена MTHFR Т/Т и MTHFR С/Т , кодирующих ферменты со сниженной функциональной активностью. Полученные результаты указывают на возможность влияния нарушений фолатного цикла на структурную целостность хромосом в условиях канцерогенных воздействий среды.</p></abstract><trans-abstract xml:lang="en"><p>In the presented «case-control» study 338 residents of the Kemerovo Region subject to age, sex, ethnicity and smoking status were included. We formed two groups: 1) «Case» - 163 newly diagnosed lung cancer patients undergoing a medical treatment in the Kemerovo Regional Oncology Center (diagnosis «lung cancer» was determined by experienced doctors from the Kemerovo Regional Oncology based on the results of special medical examination); 2) «Control» - 175 healthy donors of the Kemerovo Regional Center of Blood Transfusion. All donors included in the research were smoking Russian men over 40 years old. The aim of this study was the comparative analysis of polymorphic variants of folate metabolism genes and chromosomal aberrations (CAs) in lung cancer patients and healthy donors resident in the same territory. The following methods were used in our investigation: 1) the routine method of lymphocytes cultivation and chromosomal aberration analysis; 2) the real-time polymerase chain reaction using TaqMan assay for a study of the MTHFR gene C677T polymorphism , the MTR gene A2756G polymorphism and the MTRR gene А66G polymorphism. Statistical analysis were performed using nonparametric statistics (Mann-Whitney U Test for paired comparison of quantitative characteristics), logistic regression (for determination of association of polymorphism in additive, dominant, overdominant, recessive and log-additive models subject to quantitative and binary characteristics), Multifactor Dimensionality Reduction method (for investigation of gene-gene interactions). It was determined that the CAs frequency (both chromatid- and chromosome-type aberrations) was significant increased in lung cancer patients compared to control group. The greatest frequency of chromosome-type aberrations was determined in lung cancer patients with the minor allelic variant (T/T and C/T) on the MTHFR gene. Carriers of such genotype are characterized by decreased functional activity of enzymes. Obtained results suggest the possible effect of failure in folate cycle to the chromosomal instability in conditions of cancerogenic load of environment.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>рак легкого</kwd><kwd>гены фолатного цикла</kwd><kwd>MTHFR</kwd><kwd>MTR</kwd><kwd>MTRR</kwd><kwd>хромосомные аберрации</kwd><kwd>lung cancer</kwd><kwd>folate metabolism genes</kwd><kwd>MTHFR</kwd><kwd>MTR</kwd><kwd>MTRR</kwd><kwd>chromosomal aberrations</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">Zhang H, Cai B. The impact of tobacco on lung health in China. Respirology. 2003; 8: 17-21.</mixed-citation><mixed-citation xml:lang="en">Zhang H, Cai B. The impact of tobacco on lung health in China. Respirology. 2003; 8: 17-21.</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Weissfeld JL, Lin Y, Lin HM et al. Lung Cancer Risk Prediction Using Common SNPs Located in GWAS-Identified Susceptibility Regions. J Thorac Oncol. 2015; 10(11):1538-1545.</mixed-citation><mixed-citation xml:lang="en">Weissfeld JL, Lin Y, Lin HM et al. Lung Cancer Risk Prediction Using Common SNPs Located in GWAS-Identified Susceptibility Regions. J Thorac Oncol. 2015; 10(11):1538-1545.</mixed-citation></citation-alternatives></ref><ref id="cit3"><label>3</label><citation-alternatives><mixed-citation xml:lang="ru">Kiyohara C, Horiuchi T, Takayama K, Nakanishi Y. Methylenetetrahydrofolate reductase polymorphisms and interaction with smoking and alcohol consumption in lung cancer risk: a case-control study in a Japanese population. BMC Cancer. 2011; 11:459-469.</mixed-citation><mixed-citation xml:lang="en">Kiyohara C, Horiuchi T, Takayama K, Nakanishi Y. Methylenetetrahydrofolate reductase polymorphisms and interaction with smoking and alcohol consumption in lung cancer risk: a case-control study in a Japanese population. BMC Cancer. 2011; 11:459-469.</mixed-citation></citation-alternatives></ref><ref id="cit4"><label>4</label><citation-alternatives><mixed-citation xml:lang="ru">Arslan S, Karadayi S, Yildirim ME et al. The association between methylene-tetrahydrofolate reductase gene polymorphism and lung cancer risk. Mol Biol Rep. 2011; 38(2): 991-996.</mixed-citation><mixed-citation xml:lang="en">Arslan S, Karadayi S, Yildirim ME et al. The association between methylene-tetrahydrofolate reductase gene polymorphism and lung cancer risk. Mol Biol Rep. 2011; 38(2): 991-996.</mixed-citation></citation-alternatives></ref><ref id="cit5"><label>5</label><citation-alternatives><mixed-citation xml:lang="ru">Wang X, Yue K, Hao L. Meta-analysis of methylenetetrahydrofolate reductase polymorphism and lung cancer risk in Chinese. Int J Clin Exp Med. 2015; 15; 8(1):1521-1525.</mixed-citation><mixed-citation xml:lang="en">Wang X, Yue K, Hao L. Meta-analysis of methylenetetrahydrofolate reductase polymorphism and lung cancer risk in Chinese. Int J Clin Exp Med. 2015; 15; 8(1):1521-1525.</mixed-citation></citation-alternatives></ref><ref id="cit6"><label>6</label><citation-alternatives><mixed-citation xml:lang="ru">Алексеенко ИВ, Плешкан ВВ, Монастырская ГС и др. Принципиально низкая воспроизводимость молекулярно-генетических исследований рака. Генетика. 2016; 52(7): 745-760.</mixed-citation><mixed-citation xml:lang="en">Алексеенко ИВ, Плешкан ВВ, Монастырская ГС и др. Принципиально низкая воспроизводимость молекулярно-генетических исследований рака. Генетика. 2016; 52(7): 745-760.</mixed-citation></citation-alternatives></ref><ref id="cit7"><label>7</label><citation-alternatives><mixed-citation xml:lang="ru">Cui LH, Shin MH, Kim HN et al. Methylenetetrahydrofolate reductase C677T polymorphism in patients with lung cancer in a Korean population. BMC Med Genet. 2011; 12:28.</mixed-citation><mixed-citation xml:lang="en">Cui LH, Shin MH, Kim HN et al. Methylenetetrahydrofolate reductase C677T polymorphism in patients with lung cancer in a Korean population. BMC Med Genet. 2011; 12:28.</mixed-citation></citation-alternatives></ref><ref id="cit8"><label>8</label><citation-alternatives><mixed-citation xml:lang="ru">Laraqui A, Allami A, Carrie A et al. Influence of methionine synthase (A2756G) and methionine synthase reductase (A66G) polymorphisms on plasma homocysteine levels and relation to risk of coronary artery disease. Acta Cardiol. 2006; 61:51-61.</mixed-citation><mixed-citation xml:lang="en">Laraqui A, Allami A, Carrie A et al. Influence of methionine synthase (A2756G) and methionine synthase reductase (A66G) polymorphisms on plasma homocysteine levels and relation to risk of coronary artery disease. Acta Cardiol. 2006; 61:51-61.</mixed-citation></citation-alternatives></ref><ref id="cit9"><label>9</label><citation-alternatives><mixed-citation xml:lang="ru">Weiner AS, Boyarskikh UA, Voronina EN, Mishukova MF. Methylenetetrahydrofolate reductase C677T and methionine synthase A2756G polymorphisms influence on leukocyte genomic DNA methylation level. Gene. 2014; 533: 168-172.</mixed-citation><mixed-citation xml:lang="en">Weiner AS, Boyarskikh UA, Voronina EN, Mishukova MF. Methylenetetrahydrofolate reductase C677T and methionine synthase A2756G polymorphisms influence on leukocyte genomic DNA methylation level. Gene. 2014; 533: 168-172.</mixed-citation></citation-alternatives></ref><ref id="cit10"><label>10</label><citation-alternatives><mixed-citation xml:lang="ru">Сhoi SW, Mason JB. Folate and carcinogenesis: an integrated scheme. J. Nutr. 2000; 130: 129-132.</mixed-citation><mixed-citation xml:lang="en">Сhoi SW, Mason JB. Folate and carcinogenesis: an integrated scheme. J. Nutr. 2000; 130: 129-132.</mixed-citation></citation-alternatives></ref><ref id="cit11"><label>11</label><citation-alternatives><mixed-citation xml:lang="ru">Guo Q, Wang H, Yang K et al. Association of MTHFR and MTRR genes polymorphisms with non-disjunctions of chromosomes 18 and 21. Zhonghua Yi Xue Yi Chuan Xue Za Zhi. 2015; 32(3):395-399.</mixed-citation><mixed-citation xml:lang="en">Guo Q, Wang H, Yang K et al. Association of MTHFR and MTRR genes polymorphisms with non-disjunctions of chromosomes 18 and 21. Zhonghua Yi Xue Yi Chuan Xue Za Zhi. 2015; 32(3):395-399.</mixed-citation></citation-alternatives></ref><ref id="cit12"><label>12</label><citation-alternatives><mixed-citation xml:lang="ru">James SJ, Pogribna M, Pogribny IP et al. Abnormal folate metabolism and mutation in the methylenetetrahydrofolate reductase gene may be maternal risk factors for Down syndrome. Am J Clin Nutr. 1999; 70: 495-501.</mixed-citation><mixed-citation xml:lang="en">James SJ, Pogribna M, Pogribny IP et al. Abnormal folate metabolism and mutation in the methylenetetrahydrofolate reductase gene may be maternal risk factors for Down syndrome. Am J Clin Nutr. 1999; 70: 495-501.</mixed-citation></citation-alternatives></ref><ref id="cit13"><label>13</label><citation-alternatives><mixed-citation xml:lang="ru">Vodicka P, Polivkova Z, Sytarova S et al. Chromosomal damage in peripheral blood lymphocytes of newly diagnosed cancer patients and healthy controls. Carcinogenesis. 2010; 31: 1238-1241.</mixed-citation><mixed-citation xml:lang="en">Vodicka P, Polivkova Z, Sytarova S et al. Chromosomal damage in peripheral blood lymphocytes of newly diagnosed cancer patients and healthy controls. Carcinogenesis. 2010; 31: 1238-1241.</mixed-citation></citation-alternatives></ref><ref id="cit14"><label>14</label><citation-alternatives><mixed-citation xml:lang="ru">Harms C, Salama SA, Sierra-Torres CH et al. Polymorphisms in DNA repair genes, chromosome aberrations, and lung cancer. Environ Mol. Mutagen. 2004; 44 (1): 74-82.</mixed-citation><mixed-citation xml:lang="en">Harms C, Salama SA, Sierra-Torres CH et al. Polymorphisms in DNA repair genes, chromosome aberrations, and lung cancer. Environ Mol. Mutagen. 2004; 44 (1): 74-82.</mixed-citation></citation-alternatives></ref><ref id="cit15"><label>15</label><citation-alternatives><mixed-citation xml:lang="ru">Bucton KE, Evans HJ. Methods for the analysis of human chromosome aberrations. Geneva: WHO; 1993. 66 p.</mixed-citation><mixed-citation xml:lang="en">Bucton KE, Evans HJ. Methods for the analysis of human chromosome aberrations. Geneva: WHO; 1993. 66 p.</mixed-citation></citation-alternatives></ref><ref id="cit16"><label>16</label><citation-alternatives><mixed-citation xml:lang="ru">Skjelbred CF, Svendsen M, Haugan V et al. Influence of GSTM1, GSTT1, GSTP1, NAT1, NAT2, EPHX1, MTR and MTHFR polymorphism on chromosomal aberration frequencies in human lymphocytes. Carcinogenesis. 2011; 32(3):399-405.</mixed-citation><mixed-citation xml:lang="en">Skjelbred CF, Svendsen M, Haugan V et al. Influence of GSTM1, GSTT1, GSTP1, NAT1, NAT2, EPHX1, MTR and MTHFR polymorphism on chromosomal aberration frequencies in human lymphocytes. Carcinogenesis. 2011; 32(3):399-405.</mixed-citation></citation-alternatives></ref><ref id="cit17"><label>17</label><citation-alternatives><mixed-citation xml:lang="ru">Minina VI, Sinitsky MYu, Druzhinin VG et al. Chromosome aberrations in peripheral blood lymphocytes of lung cancer patients exposed to rad on and air pollution. Eur. J. Cancer Prevention. 2016; 25(4): 70-77.</mixed-citation><mixed-citation xml:lang="en">Minina VI, Sinitsky MYu, Druzhinin VG et al. Chromosome aberrations in peripheral blood lymphocytes of lung cancer patients exposed to rad on and air pollution. Eur. J. Cancer Prevention. 2016; 25(4): 70-77.</mixed-citation></citation-alternatives></ref><ref id="cit18"><label>18</label><citation-alternatives><mixed-citation xml:lang="ru">Yang Y, Yang LJ, Deng MZ et al. MTHFR C677T and A1298C polymorphisms and risk of lung cancer: a comprehensive evaluation. Genet Mol Res. 2016; 15(2), doi: 10.4238/gmr.15027615.</mixed-citation><mixed-citation xml:lang="en">Yang Y, Yang LJ, Deng MZ et al. MTHFR C677T and A1298C polymorphisms and risk of lung cancer: a comprehensive evaluation. Genet Mol Res. 2016; 15(2), doi: 10.4238/gmr.15027615.</mixed-citation></citation-alternatives></ref><ref id="cit19"><label>19</label><citation-alternatives><mixed-citation xml:lang="ru">Pfeiffer P, Goedecke W, Obe G. Mechanisms of DNA double-strand break repair and their potential to induce chromosomal aberrations. Mutagenesis. 2000; 15: 289-302.</mixed-citation><mixed-citation xml:lang="en">Pfeiffer P, Goedecke W, Obe G. Mechanisms of DNA double-strand break repair and their potential to induce chromosomal aberrations. Mutagenesis. 2000; 15: 289-302.</mixed-citation></citation-alternatives></ref><ref id="cit20"><label>20</label><citation-alternatives><mixed-citation xml:lang="ru">Sinthuwiwat T, Poowasanpetch P, Wongngamrungroj A et al. Association of MTHFR polymorphisms and chromosomal abnormalities in leukemia. Dis Markers. 2012; 32(2):115-121.</mixed-citation><mixed-citation xml:lang="en">Sinthuwiwat T, Poowasanpetch P, Wongngamrungroj A et al. Association of MTHFR polymorphisms and chromosomal abnormalities in leukemia. Dis Markers. 2012; 32(2):115-121.</mixed-citation></citation-alternatives></ref></ref-list><fn-group><fn fn-type="conflict"><p>The authors declare that there are no conflicts of interest present.</p></fn></fn-group></back></article>
