<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE article PUBLIC "-//NLM//DTD JATS (Z39.96) Journal Publishing DTD v1.3 20210610//EN" "JATS-journalpublishing1-3.dtd">
<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">perinatology</journal-id><journal-title-group><journal-title xml:lang="ru">Российский вестник перинатологии и педиатрии</journal-title><trans-title-group xml:lang="en"><trans-title>Rossiyskiy Vestnik Perinatologii i Pediatrii (Russian Bulletin of Perinatology and Pediatrics)</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1027-4065</issn><issn pub-type="epub">2500-2228</issn><publisher><publisher-name>Ltd. “The National Academy of Pediatric Science and Innovation”</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.21508/1027-4065-2026-71-2-50-56</article-id><article-id custom-type="elpub" pub-id-type="custom">perinatology-2379</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 СТАТЬИ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>ORIGINAL ARTICLES</subject></subj-group></article-categories><title-group><article-title>Дисбаланс метионинового цикла у детей с многофакторными формами расстройств аутистического спектра: клинико-лабораторное исследование</article-title><trans-title-group xml:lang="en"><trans-title>Methionine cycle imbalance in children with multifactorial forms of autism spectrum disorders: a clinical and laboratory study</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0783-2873</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Мамедов</surname><given-names>И. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Mamedov</surname><given-names>I. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Мамедов Ильгар Салехович — д.б.н., ведущий научный сотрудник </p><p>119620, г. Москва, ул. Авиаторов, дом 38 </p></bio><bio xml:lang="en"><p>119619, Moscow </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/0000-0002-7070-3209</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Перевезенцев</surname><given-names>О. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Perevezentsev</surname><given-names>O. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Перевезенцев Олег Александрович — к.м.н., старший научный сотрудник; доцент кафедры персонализированной и трансляционной медицины</p><p>344012, г. Ростов-на-Дону, Нахичеванский переулок, дом 29 </p></bio><bio xml:lang="en"><p>119619, Moscow </p><p>344012, Rostov-on-Don </p></bio><email xlink:type="simple">PZPO@mail.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/0000-0003-2117-386X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Золкина</surname><given-names>И. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Zolkina</surname><given-names>I. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Золкина Ирина Вячеславовна — к.б.н., доцент кафедры госпитальной эпидемиологии, медицинской паразитологии и тропических болезней</p><p>125993, г. Москва, ул. Баррикадная, дом 2/1, строение 1 </p></bio><bio xml:lang="en"><p>125993, Moscow </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/0009-0009-7280-5127</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Киселев</surname><given-names>Д. П.</given-names></name><name name-style="western" xml:lang="en"><surname>Kiselev</surname><given-names>D. P.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Киселев Дмитрий Петрович — врач клинико-лабораторной диагностики </p><p>119620, Москва </p></bio><bio xml:lang="en"><p>119619, Moscow </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/0000-0003-0811-0653</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Татаринов</surname><given-names>П. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Tatarinov</surname><given-names>P. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Татаринов Петр Анатольевич — к.м.н, профессор кафедры клинической фармакологии Ю.Б. Белоусова Института клинической медицины, ведущий научный сотрудник</p><p>119620, г. Москва, ул.Авиаторов, дом 38 </p></bio><bio xml:lang="en"><p>119619, Moscow </p><p>117513, Moscow </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/0000-0001-8927-3176</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Сухоруков</surname><given-names>В. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Sukhorukov</surname><given-names>V. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Сухоруков Владимир Сергеевич — д.м.н., профессор, заведующий лабораторией нейроморфологии Института мозга; профессор кафедры морфологии Института анатомии и морфологии имени академика Ю.М. Лопухина</p><p>125367, г. Москва, Волоколамское шоссе, дом 80 </p></bio><bio xml:lang="en"><p>117513, Moscow </p><p>125367, Moscow </p></bio><xref ref-type="aff" rid="aff-5"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-4653-9867</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Крапивкин</surname><given-names>А. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Krapivkin</surname><given-names>A. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Крапивкин Алексей Игорьевич — д.м.н., профессор кафедры госпитальной педиатрии им. академика В.А. Таболина Института материнства и детства; директор </p><p>119620, г. Москва, ул. Авиаторов, дом 38 </p></bio><bio xml:lang="en"><p>119619, Moscow </p><p>117513, Moscow </p></bio><xref ref-type="aff" rid="aff-4"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>ГБУЗ «Научно-практический центр специализированной помощи детям имени Н.В. Войно-Ясенецкого Департамента здравоохранения г. Москвы»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>N.V. Voyno-Yasenetsky Scientific and Practical Center for Specialized Assistance for Children of the Department of Healthcare of Moscow</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>ГБУЗ «Научно-практический центр специализированной помощи детям имени Н.В. Войно-Ясенецкого Департамента здравоохранения г. Москвы» ; ФГБОУ ВО «Ростовский государственный медицинский университет» Минздрава РФ</institution><country>Россия</country></aff><aff xml:lang="en"><institution>N.V. Voyno-Yasenetsky Scientific and Practical Center for Specialized Assistance for Children of the Department of Healthcare of Moscow ; Rostov State Medical University</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-3"><aff xml:lang="ru"><institution>ФГБОУ ДПО «Российская медицинская академия непрерывного профессионального образования»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Russian Medical Academy of Continuing Professional Education</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-4"><aff xml:lang="ru"><institution>ГБУЗ «Научно-практический центр специализированной помощи детям имени Н.В. Войно-Ясенецкого Департамента здравоохранения г. Москвы» ; ФГАОУ ВО «Российский национальный исследовательский медицинский университет имени. Н.И. Пирогова» Минздрава России</institution><country>Россия</country></aff><aff xml:lang="en"><institution>N.V. Voyno-Yasenetsky Scientific and Practical Center for Specialized Assistance for Children of the Department of Healthcare of Moscow ; Pirogov Russian National Medical University</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-5"><aff xml:lang="ru"><institution>ФГАОУ ВО «Российский национальный исследовательский медицинский университет имени. Н.И. Пирогова» Минздрава России ; ФГБНУ «Российский центр неврологии и нейронаук»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Pirogov Russian National Medical University ; Russian Сenter of Neurology and Neurosciences</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2026</year></pub-date><pub-date pub-type="epub"><day>25</day><month>04</month><year>2026</year></pub-date><volume>71</volume><issue>2</issue><fpage>50</fpage><lpage>56</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Ltd. “The National Academy of Pediatric Science and Innovation”, 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Ltd. “The National Academy of Pediatric Science and Innovation”</copyright-holder><copyright-holder xml:lang="en">Ltd. “The National Academy of Pediatric Science and Innovation”</copyright-holder><license xlink:href="https://www.ped-perinatology.ru/jour/about/submissions#copyrightNotice" xlink:type="simple"><license-p>https://www.ped-perinatology.ru/jour/about/submissions#copyrightNotice</license-p></license></permissions><self-uri xlink:href="https://www.ped-perinatology.ru/jour/article/view/2379">https://www.ped-perinatology.ru/jour/article/view/2379</self-uri><abstract><p>Расстройства аутистического спектра характеризуются выраженной гетерогенностью. Стандартная клиническая классификация неотражает особенностей метаболизма пациентов, чтоограничивает возможности лабораторной стратификации ипатогенетически ориентированного подхода к лечению. Одним из ключевых биохимических путей, потенциально вовлеченных впатогенез идиопатических форм расстройств аутистического спектра, является метиониновый цикл иодноуглеродный обмен.</p><sec><title>Цель исследования</title><p>Цель исследования. Оценить показатели метионинового цикла у детей с несиндромальными и идиопатическими формами расстройств аутистического спектра и определить их клинико-диагностическую значимость.</p></sec><sec><title>Материалы и методы</title><p>Материалы и методы. Проведено одномоментное сравнительное исследование с участием 65 детей с мультифакторными расстройствами аутистического спектра (распределенных по тяжести аутистических расстройств на 3 подгруппы согласно DSM-5: ASD Level 1, ASD Level 2, ASD Level 3) в возрасте 44–72 месяцев и 30 условно здоровых детей контрольной группы. Определение гомоцистеина (Hcy), S-аденозилметионина (AdoMet) и S-аденозилгомоцистеина (AdoHcy) выполнено методом жидкостной хроматографии с тандемной масс-спектрометрией. Рассчитывали соотношение AdoMet/AdoHcy как интегральный показатель метилирующего потенциала. Статистический анализ включал непараметрические методы.</p></sec><sec><title>Результаты</title><p>Результаты. У всех подгрупп пациентов с выявлены статистически значимые отличия от контрольной группы по всем показателям одноуглеродного обмена (p&lt;0,001). Отмечено повышение уровня гомоцистеина, снижение концентрации AdoMet, накопление AdoHcy и выраженное снижение соотношения AdoMet/AdoHcy. Наиболее выраженные нарушения метилирующего потенциала выявлены у пациентов с расстройствами аутистического спектра 3 уровня тяжести согласно DSM-5 (ASD Level 3). Показатель AdoMet/AdoHcy продемонстрировал наибольшую диагностическую специфичность между клиническими группами.</p></sec><sec><title>Заключение</title><p>Заключение. У детей с мультифакторными расстройствами аутистического спектра выявлен системный дисбаланс метионинового цикла. Комплексная оценка Hcy, AdoMet и AdoHcy, а также расчет соотношения AdoMet/AdoHcy могут рассматриваться как перспективный лабораторный инструмент лабораторной диагностики расстройств аутистического спектра у пациентов и обоснования патогенетически ориентированных метаболических вмешательств в педиатрической практике.</p></sec></abstract><trans-abstract xml:lang="en"><p>Autism spectrum disorders are characterized by marked heterogeneity. Standard clinical classification does not reflect the metabolic characteristics of patients, which limits the possibilities of laboratory stratification and a pathogenetically focused approach to treatment. One of the key biochemical pathways potentially involved in the pathogenesis of idiopathic forms of autism spectrum disorders is the methionine cycle and one-carbon metabolism.</p><sec><title>The aim of the study</title><p>The aim of the study. To evaluate methionine cycle parameters in children with non-syndromic and idiopathic forms of autism spectrum disorders and determine their clinical and diagnostic significance.</p></sec><sec><title>Materials and methods</title><p>Materials and methods. A cross-sectional comparative study was conducted involving 65 children with multifactorial autism spectrum disorders (divided by the severity of autism spectrum disorders into 3 subgroups according to DSM-5: ASD Level 1, ASD Level 2, ASD Level 3) aged 44–72 months and 30 apparently healthy children in the control group. Homocysteine (Hcy), S-adenosylmethionine (AdoMet), and S-adenosylhomocysteine (AdoHcy) were determined by liquid chromatography with tandem mass spectrometry. The AdoMet/AdoHcy ratio was calculated as an integral indicator of methylation potential. Statistical analysis included nonparametric methods.</p></sec><sec><title>Results</title><p>Results. All subgroups of patients showed statistically significant differences from the control group for all indicators of one-carbon metabolism (p&lt;0.001). An increase in homocysteine levels, a decrease in AdoMet concentrations, an accumulation of AdoHcy, and a significant decrease in the AdoMet/AdoHcy ratio were observed. The most pronounced methylation potential disturbances were detected in patients with autism spectrum disorders (ASD Level 3) according to DSM-5. The AdoMet/AdoHcy ratio demonstrated the highest diagnostic specificity among clinical groups.</p></sec><sec><title>Conclusion</title><p>Conclusion. A systemic methionine cycle imbalance was detected in children with multifactorial autism spectrum disorders. A comprehensive assessment of Hcy, AdoMet, and AdoHcy, as well as calculation of the AdoMet/AdoHcy ratio, can be considered a promising tool for the laboratory diagnosis of autism spectrum disorders in patients and for the justification of pathogenetically targeted metabolic interventions in pediatric practice.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>дети</kwd><kwd>расстройства аутистического спектра</kwd><kwd>метиониновый цикл</kwd><kwd>S-аденозилметионин</kwd><kwd>S-аденозилгомоцистеин</kwd></kwd-group><kwd-group xml:lang="en"><kwd>children</kwd><kwd>autism spectrum disorders</kwd><kwd>methionine cycle</kwd><kwd>S-adenosylmethionine</kwd><kwd>S-adenosylhomocysteine</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">Hyman S.L., Levy S.E., Myers S.M. Council onchildren with disabilities, section on developmental and behavioral pediatrics. Identification, Evaluation, and Management of Children With Autism Spectrum Disorder. Pediatrics. 2020; 145(1): e20193447. DOI: 10.1542/peds.2019-3447</mixed-citation><mixed-citation xml:lang="en">Hyman S.L., Levy S.E., Myers S.M. Council onchildren with disabilities, section on developmental and behavioral pediatrics. Identification, Evaluation, and Management of Children With Autism Spectrum Disorder. Pediatrics. 2020; 145(1): e20193447. DOI: 10.1542/peds.2019-3447</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">American Psychiatric Association. Diagnostic and Statistical Manual of Mental Disorders. 5th ed. Arlington, VA: APA Publishing, 2013.</mixed-citation><mixed-citation xml:lang="en">American Psychiatric Association. Diagnostic and Statistical Manual of Mental Disorders. 5th ed. Arlington, VA: APA Publishing, 2013.</mixed-citation></citation-alternatives></ref><ref id="cit3"><label>3</label><citation-alternatives><mixed-citation xml:lang="ru">Autism spectrum disorder in under 19s: recognition, referral and diagnosis. London: National Institute for Health and Care Excellence (NICE), 2017</mixed-citation><mixed-citation xml:lang="en">Autism spectrum disorder in under 19s: recognition, referral and diagnosis. London: National Institute for Health and Care Excellence (NICE), 2017</mixed-citation></citation-alternatives></ref><ref id="cit4"><label>4</label><citation-alternatives><mixed-citation xml:lang="ru">National Institute for Health and Care Excellence (NICE) Autism spectrum disorder in under 19s: support and management (CG170). London, 2013</mixed-citation><mixed-citation xml:lang="en">National Institute for Health and Care Excellence (NICE) Autism spectrum disorder in under 19s: support and management (CG170). London, 2013</mixed-citation></citation-alternatives></ref><ref id="cit5"><label>5</label><citation-alternatives><mixed-citation xml:lang="ru">James S.J., Cutler P., Melnyk S., Jernigan S., Janak L., Gaylor D.W. et al. Metabolic biomarkers of increased oxidative stress and impaired methylation capacity in children with autism. Am J Clin Nutr. 2004; 80(6): 1611–7. DOI: 10.1093/ajcn/80.6.1611</mixed-citation><mixed-citation xml:lang="en">James S.J., Cutler P., Melnyk S., Jernigan S., Janak L., Gaylor D.W. et al. Metabolic biomarkers of increased oxidative stress and impaired methylation capacity in children with autism. Am J Clin Nutr. 2004; 80(6): 1611–7. DOI: 10.1093/ajcn/80.6.1611</mixed-citation></citation-alternatives></ref><ref id="cit6"><label>6</label><citation-alternatives><mixed-citation xml:lang="ru">James S.J., Melnyk S., Jernigan S., Cleves M.A., Halsted C.H., Wong D.H. et al. Metabolic endophenotype and related genotypes are associated with oxidative stress in children with autism. Am J Med Genet B Neuropsychiatr Genet. 2006; 141(8): 947–56. DOI: 10.1002/ajmg.b.30366</mixed-citation><mixed-citation xml:lang="en">James S.J., Melnyk S., Jernigan S., Cleves M.A., Halsted C.H., Wong D.H. et al. Metabolic endophenotype and related genotypes are associated with oxidative stress in children with autism. Am J Med Genet B Neuropsychiatr Genet. 2006; 141(8): 947–56. DOI: 10.1002/ajmg.b.30366</mixed-citation></citation-alternatives></ref><ref id="cit7"><label>7</label><citation-alternatives><mixed-citation xml:lang="ru">Paşca S.P., Dronca E., Kaucsár T., Craciun E.C., Endreffy E., Ferencz B.K. et al. One carbon metabolism disturbances and the C677T MTHFR gene polymorphism in children with autism spectrum disorders. J Cell Mol Med. 2009;13(10):4229–38. DOI: 10.1111/j.1582-4934.2008.00463</mixed-citation><mixed-citation xml:lang="en">Paşca S.P., Dronca E., Kaucsár T., Craciun E.C., Endreffy E., Ferencz B.K. et al. One carbon metabolism disturbances and the C677T MTHFR gene polymorphism in children with autism spectrum disorders. J Cell Mol Med. 2009;13(10):4229–38. DOI: 10.1111/j.1582-4934.2008.00463</mixed-citation></citation-alternatives></ref><ref id="cit8"><label>8</label><citation-alternatives><mixed-citation xml:lang="ru">Li B., Xu Y., Pang D., Zhao Q., Zhang L., Li M. et al. Interrelation between homocysteine metabolism and the development of autism spectrum disorder in children. Front Mol Neurosci. 2022; 15: 947513. DOI: 10.3389/fnmol.2022.947513</mixed-citation><mixed-citation xml:lang="en">Li B., Xu Y., Pang D., Zhao Q., Zhang L., Li M. et al. Interrelation between homocysteine metabolism and the development of autism spectrum disorder in children. Front Mol Neurosci. 2022; 15: 947513. DOI: 10.3389/fnmol.2022.947513</mixed-citation></citation-alternatives></ref><ref id="cit9"><label>9</label><citation-alternatives><mixed-citation xml:lang="ru">Tisato V., Silva J.A., Longo G., Gallo I., Singh A.V., Milani D. et al. Genetics and Epigenetics of One-Carbon Metabolism Pathway in Autism Spectrum Disorder: A Sex-Specific Brain Epigenome? Genes (Basel). 2021 May 20;12(5):782. DOI: 10.3390/genes12050782</mixed-citation><mixed-citation xml:lang="en">Tisato V., Silva J.A., Longo G., Gallo I., Singh A.V., Milani D. et al. Genetics and Epigenetics of One-Carbon Metabolism Pathway in Autism Spectrum Disorder: A Sex-Specific Brain Epigenome? Genes (Basel). 2021 May 20;12(5):782. DOI: 10.3390/genes12050782</mixed-citation></citation-alternatives></ref><ref id="cit10"><label>10</label><citation-alternatives><mixed-citation xml:lang="ru">James S.J., Melnyk S., Fuchs G., Reid T., Jernigan S., Pavliv O. et al. Efficacy of methylcobalamin and folinic acid treatment on glutathione redox status in children with autism. Am J Clin Nutr. 2009 Jan;89(1):425–30. DOI: 10.3945/ajcn.2008.26615</mixed-citation><mixed-citation xml:lang="en">James S.J., Melnyk S., Fuchs G., Reid T., Jernigan S., Pavliv O. et al. Efficacy of methylcobalamin and folinic acid treatment on glutathione redox status in children with autism. Am J Clin Nutr. 2009 Jan;89(1):425–30. DOI: 10.3945/ajcn.2008.26615</mixed-citation></citation-alternatives></ref><ref id="cit11"><label>11</label><citation-alternatives><mixed-citation xml:lang="ru">Wang T., He W., Chen Y., Gou Y., Ma Y., Du X. et al. Differential One-Carbon Metabolites among Children with Autism Spectrum Disorder: A Case-Control Study. J Nutr. 2024; 154(11): 3346–3352. DOI: 10.1016/j.tjnut.2024.09.004</mixed-citation><mixed-citation xml:lang="en">Wang T., He W., Chen Y., Gou Y., Ma Y., Du X. et al. Differential One-Carbon Metabolites among Children with Autism Spectrum Disorder: A Case-Control Study. J Nutr. 2024; 154(11): 3346–3352. DOI: 10.1016/j.tjnut.2024.09.004</mixed-citation></citation-alternatives></ref><ref id="cit12"><label>12</label><citation-alternatives><mixed-citation xml:lang="ru">Kałużna-Czaplińska J., Żurawicz E., Michalska M., Rynkowski J. A focus on homocysteine in autism. Acta Biochim Pol. 2013; 60(2): 137–42</mixed-citation><mixed-citation xml:lang="en">Kałużna-Czaplińska J., Żurawicz E., Michalska M., Rynkowski J. A focus on homocysteine in autism. Acta Biochim Pol. 2013; 60(2): 137–42</mixed-citation></citation-alternatives></ref><ref id="cit13"><label>13</label><citation-alternatives><mixed-citation xml:lang="ru">Struys E.A., Jansen E.E., de Meer K., Jakobs C. Determination of S-adenosylmethionine and S-adenosylhomocysteine in plasma and cerebrospinal fluid by stable-isotope dilution tandem mass spectrometry. Clin Chem. 2000; 46(10): 1650–6</mixed-citation><mixed-citation xml:lang="en">Struys E.A., Jansen E.E., de Meer K., Jakobs C. Determination of S-adenosylmethionine and S-adenosylhomocysteine in plasma and cerebrospinal fluid by stable-isotope dilution tandem mass spectrometry. Clin Chem. 2000; 46(10): 1650–6</mixed-citation></citation-alternatives></ref><ref id="cit14"><label>14</label><citation-alternatives><mixed-citation xml:lang="ru">Zhang, Y., Kang, A., Deng, H., Shi L., Su S., Yu L. et al. Simultaneous determination of sulfur compounds from the sulfur pathway in rat plasma by liquid chromatography tandem mass spectrometry: application to the study of the effect of Shao Fu Zhu Yu decoction. Anal Bioanal Chem 410, 3743–3755 (2018). DOI: 10.1007/s00216-018-1038-2</mixed-citation><mixed-citation xml:lang="en">Zhang, Y., Kang, A., Deng, H., Shi L., Su S., Yu L. et al. Simultaneous determination of sulfur compounds from the sulfur pathway in rat plasma by liquid chromatography tandem mass spectrometry: application to the study of the effect of Shao Fu Zhu Yu decoction. Anal Bioanal Chem 410, 3743–3755 (2018). DOI: 10.1007/s00216-018-1038-2</mixed-citation></citation-alternatives></ref><ref id="cit15"><label>15</label><citation-alternatives><mixed-citation xml:lang="ru">Klepacki J., Klawitter J., Votavova H. et al. Quantification of S-adenosylmethionine and S-adenosylhomocysteine in human plasma by LC-MS/MS. Clin. Chim. Acta. 2013; 424: 9–16</mixed-citation><mixed-citation xml:lang="en">Klepacki J., Klawitter J., Votavova H. et al. Quantification of S-adenosylmethionine and S-adenosylhomocysteine in human plasma by LC-MS/MS. Clin. Chim. Acta. 2013; 424: 9–16</mixed-citation></citation-alternatives></ref><ref id="cit16"><label>16</label><citation-alternatives><mixed-citation xml:lang="ru">Castro R., Struys E.A., Jansen E.E., Blom H.J., de Almeida I.T., Jakobs C. Quantification of plasma S-adenosylmethionine and S-adenosylhomocysteine as their fluorescent 1,N(6)-etheno derivatives: an adaptation of previously described methodology. J Pharm Biomed Anal. 2002 Jul 31;29(5):963–8. DOI: 10.1016/s0731-7085(02)00121-8</mixed-citation><mixed-citation xml:lang="en">Castro R., Struys E.A., Jansen E.E., Blom H.J., de Almeida I.T., Jakobs C. Quantification of plasma S-adenosylmethionine and S-adenosylhomocysteine as their fluorescent 1,N(6)-etheno derivatives: an adaptation of previously described methodology. J Pharm Biomed Anal. 2002 Jul 31;29(5):963–8. DOI: 10.1016/s0731-7085(02)00121-8</mixed-citation></citation-alternatives></ref><ref id="cit17"><label>17</label><citation-alternatives><mixed-citation xml:lang="ru">N. Blau, M. Duran, K.M. Gibson, C. Dionisi-Vici (eds.). Laboratory Guide to the Methods in Biochemical Genetics. 2nd ed. Berlin: Springer, 2022.</mixed-citation><mixed-citation xml:lang="en">N. Blau, M. Duran, K.M. Gibson, C. Dionisi-Vici (eds.). Laboratory Guide to the Methods in Biochemical Genetics. 2nd ed. Berlin: Springer, 2022.</mixed-citation></citation-alternatives></ref><ref id="cit18"><label>18</label><citation-alternatives><mixed-citation xml:lang="ru">Obeid R., Herrmann W. The emerging role of unmetabolized folic acid in human diseases: myth or reality? Curr Drug Metab. 2012;13(8):1184–95. DOI: 10.2174/138920012802850137</mixed-citation><mixed-citation xml:lang="en">Obeid R., Herrmann W. The emerging role of unmetabolized folic acid in human diseases: myth or reality? Curr Drug Metab. 2012;13(8):1184–95. DOI: 10.2174/138920012802850137</mixed-citation></citation-alternatives></ref><ref id="cit19"><label>19</label><citation-alternatives><mixed-citation xml:lang="ru">Frye R.E., Rossignol D.A. Mitochondrial dysfunction can connect the diverse medical symptoms associated with autism spectrum disorders. Pediatr Res. 2011;69(5):41R-7R. DOI: 10.1203/PDR.0b013e318212f16b</mixed-citation><mixed-citation xml:lang="en">Frye R.E., Rossignol D.A. Mitochondrial dysfunction can connect the diverse medical symptoms associated with autism spectrum disorders. Pediatr Res. 2011;69(5):41R-7R. DOI: 10.1203/PDR.0b013e318212f16b</mixed-citation></citation-alternatives></ref><ref id="cit20"><label>20</label><citation-alternatives><mixed-citation xml:lang="ru">Usui N., Kobayashi H., Shimada S. Neuroinflammation and Oxidative Stress in the Pathogenesis of Autism Spectrum Disorder. Int J Mol Sci. 2023 Mar 13;24(6):5487. DOI: 10.3390/ijms24065487</mixed-citation><mixed-citation xml:lang="en">Usui N., Kobayashi H., Shimada S. Neuroinflammation and Oxidative Stress in the Pathogenesis of Autism Spectrum Disorder. Int J Mol Sci. 2023 Mar 13;24(6):5487. DOI: 10.3390/ijms24065487</mixed-citation></citation-alternatives></ref><ref id="cit21"><label>21</label><citation-alternatives><mixed-citation xml:lang="ru">Mostafa G.A., Al-Ayadhi L.Y. The possible link between the elevated serum levels of neurokinin A and anti-ribosomal P protein antibodies in children with autism. 2012;42(4): 614–622.</mixed-citation><mixed-citation xml:lang="en">Mostafa G.A., Al-Ayadhi L.Y. The possible link between the elevated serum levels of neurokinin A and anti-ribosomal P protein antibodies in children with autism. 2012;42(4): 614–622.</mixed-citation></citation-alternatives></ref><ref id="cit22"><label>22</label><citation-alternatives><mixed-citation xml:lang="ru">Rossignol D.A., Frye R.E. Evidence linking oxidative stress, mitochondrial dysfunction, and inflammation in the brain of individuals with autism. Front Physiol. 2014;5:150. DOI: 10.3389/fphys.2014.00150</mixed-citation><mixed-citation xml:lang="en">Rossignol D.A., Frye R.E. Evidence linking oxidative stress, mitochondrial dysfunction, and inflammation in the brain of individuals with autism. Front Physiol. 2014;5:150. DOI: 10.3389/fphys.2014.00150</mixed-citation></citation-alternatives></ref><ref id="cit23"><label>23</label><citation-alternatives><mixed-citation xml:lang="ru">Guo B.Q., Li H.B., Ding S.B. Blood homocysteine levels in children with autism spectrum disorder: An updated systematic review and meta-analysis. Psychiatry Res. 2020; 291: 113283. DOI: 10.1016/j.psychres.2020.113283</mixed-citation><mixed-citation xml:lang="en">Guo B.Q., Li H.B., Ding S.B. Blood homocysteine levels in children with autism spectrum disorder: An updated systematic review and meta-analysis. Psychiatry Res. 2020; 291: 113283. DOI: 10.1016/j.psychres.2020.113283</mixed-citation></citation-alternatives></ref><ref id="cit24"><label>24</label><citation-alternatives><mixed-citation xml:lang="ru">Przybycien-Gaweda P.M., Lee T.S., Lim W.S., Chong M.S., Yap P., Cheong C.Y. et al. One-Carbon Metabolism Biomarkers and Risks of Incident Neurocognitive Disorder among Cognitively Normal Older Adults. Nutrients. 2022; 14(17): 3535. DOI: 10.3390/nu14173535</mixed-citation><mixed-citation xml:lang="en">Przybycien-Gaweda P.M., Lee T.S., Lim W.S., Chong M.S., Yap P., Cheong C.Y. et al. One-Carbon Metabolism Biomarkers and Risks of Incident Neurocognitive Disorder among Cognitively Normal Older Adults. Nutrients. 2022; 14(17): 3535. DOI: 10.3390/nu14173535</mixed-citation></citation-alternatives></ref><ref id="cit25"><label>25</label><citation-alternatives><mixed-citation xml:lang="ru">Юрьева Э.А., Новикова Н.Н., Длин В.В., Воздвиженская Е.С. Молекулярный стресс и хронические нарушения обмена веществ. Российский вестник перинатологии и педиатрии. 2020; 65(5): 12–22. DOI: 10.21508/1027-4065-2020-65-5-12-22</mixed-citation><mixed-citation xml:lang="en">Yurieva E.A., Novikova N.N., Dlin V.V., Vozdvizhenskaya E.S. Molecular stress and chronic metabolic disorders. Rossiyskiy Vestnik Perinatologii i Pediatrii. 2020;65(5):12–22. (in Russ.). DOI: 10.21508/1027-4065-2020-65-5-12-22</mixed-citation></citation-alternatives></ref><ref id="cit26"><label>26</label><citation-alternatives><mixed-citation xml:lang="ru">Панова М.С., Панченко А.С., Зиганшин А.М., Мудров В.А. Нейроспецифические маркеры поражения головного мозга у детей раннего возраста. Российский вестник перинатологии и педиатрии. 2022;67(5):55–61. DOI: 10.21508/1027-4065-2022-67-5-55-61</mixed-citation><mixed-citation xml:lang="en">Panova M.S., Panchenko A.S., Ziganshin A.M., Mudrov V.A. Neurospecific markers of brain damage in infants. Rossiyskiy Vestnik Perinatologii i Pediatrii (Russian Bulletin of Perinatology and Pediatrics). 2022; 67(5): 55–61. (in Russ.). DOI: 10.21508/1027-4065-2022-67-5-55-61</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>
