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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="other" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Neuromuscular Diseases</journal-id><journal-title-group><journal-title xml:lang="en">Neuromuscular Diseases</journal-title><trans-title-group xml:lang="ru"><trans-title>Нервно-мышечные болезни</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2222-8721</issn><issn publication-format="electronic">2413-0443</issn><publisher><publisher-name xml:lang="en">Publishing House ABV Press</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">345</article-id><article-id pub-id-type="doi">10.17650/2222-8721-2019-9-3-57-76</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>CLINICAL CASE</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>КЛИНИЧЕСКИЙ РАЗБОР</subject></subj-group><subj-group subj-group-type="article-type"><subject></subject></subj-group></article-categories><title-group><article-title xml:lang="en">Infantile and early childhood onset of mitochondrial myopathy due to mutations in the TK2 gene with a phenotype of spinal muscular atrophy 5q: the first cases in Russia</article-title><trans-title-group xml:lang="ru"><trans-title>Младенческая и детская форма митохондриальной миопатии с мутациями в гене ТК2 с фенотипом спинальной мышечной атрофии 5q: первые случаи в России</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-8886-5222</contrib-id><name-alternatives><name xml:lang="en"><surname>Kurbatov</surname><given-names>S. A.</given-names></name><name xml:lang="ru"><surname>Курбатов</surname><given-names>С. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>5a Lenina Sq., Voronezh 394018; Build. 2, 17 Krzhizhanovskogo St., Moscow 117258</p></bio><bio xml:lang="ru"><p>Сергей Александрович Курбатов</p><p>394018 Воронеж, пл. Ленина, 5а; 117258 Москва, ул. Кржижановского, 17/2</p></bio><email>kurbatov80@list.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3998-3609</contrib-id><name-alternatives><name xml:lang="en"><surname>Tsygankova</surname><given-names>P. G.</given-names></name><name xml:lang="ru"><surname>Цыганкова</surname><given-names>П. Г.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>1 Moskvorech’e St., Moscow 115478</p></bio><bio xml:lang="ru"><p>Лаборатория наследственных болезней обмена веществ</p><p>115522 Москва, ул. Москворечье, 1</p></bio><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-3812-0126</contrib-id><name-alternatives><name xml:lang="en"><surname>Mollaeva</surname><given-names>K. Yu.</given-names></name><name xml:lang="ru"><surname>Моллаева</surname><given-names>К. Ю.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Department of Neurology</p><p>3 Pirogov St., Makhachkala 367000</p></bio><bio xml:lang="ru"><p>Кафедра неврологии факультета ФПК и ППС</p><p>367000 Махачкала, ул. Пирогова, 3</p></bio><xref ref-type="aff" rid="aff4"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-6594-6126</contrib-id><name-alternatives><name xml:lang="en"><surname>Bychkov</surname><given-names>I. O.</given-names></name><name xml:lang="ru"><surname>Бычков</surname><given-names>И. О.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>1 Moskvorech’e St., Moscow 115478</p></bio><bio xml:lang="ru"><p>Лаборатория наследственных болезней обмена веществ</p><p>115522 Москва, ул. Москворечье, 1</p></bio><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Itkis</surname><given-names>Yu. S.</given-names></name><name xml:lang="ru"><surname>Иткис</surname><given-names>Ю. С.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>1 Moskvorech’e St., Moscow 115478</p></bio><bio xml:lang="ru"><p>Лаборатория наследственных болезней обмена веществ</p><p>115522 Москва, ул. Москворечье, 1</p></bio><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-0649-5062</contrib-id><name-alternatives><name xml:lang="en"><surname>Zabnenkova</surname><given-names>V. V.</given-names></name><name xml:lang="ru"><surname>Забненкова</surname><given-names>В. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>DNA diagnostics laboratory</p><p>1 Moskvorech’e St., Moscow 115478</p></bio><bio xml:lang="ru"><p>Лаборатория ДНК-диагностики</p><p>115522 Москва, ул. Москворечье, 1</p></bio><xref ref-type="aff" rid="aff5"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7084-0572</contrib-id><name-alternatives><name xml:lang="en"><surname>Umakhanova</surname><given-names>Z. R.</given-names></name><name xml:lang="ru"><surname>Умаханова</surname><given-names>З. Р.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Department of Neurology</p><p>3 Pirogov St., Makhachkala 367000</p></bio><bio xml:lang="ru"><p>Кафедра неврологии факультета ФПК и ППС</p><p>367000 Махачкала, ул. Пирогова, 3</p></bio><xref ref-type="aff" rid="aff4"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-6455-2862</contrib-id><name-alternatives><name xml:lang="en"><surname>Geybatova</surname><given-names>L. G.</given-names></name><name xml:lang="ru"><surname>Гейбатова</surname><given-names>Л. Г.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Department of Neurology</p><p>3 Pirogov St., Makhachkala 367000</p></bio><bio xml:lang="ru"><p>Кафедра неврологии факультета ФПК и ППС</p><p>367000 Махачкала, ул. Пирогова, 3</p></bio><xref ref-type="aff" rid="aff4"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Zakharova</surname><given-names>E. Yu.</given-names></name><name xml:lang="ru"><surname>Захарова</surname><given-names>Е. Ю.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>1 Moskvorech’e St., Moscow 115478</p></bio><bio xml:lang="ru"><p>Лаборатория наследственных болезней обмена веществ</p><p>115522 Москва, ул. Москворечье, 1</p></bio><xref ref-type="aff" rid="aff3"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Voronezh Regional Clinical Consulting and Diagnostic Center</institution></aff><aff><institution xml:lang="ru">АУЗ ВО Воронежский областной клинический консультативно-диагностический центр</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Association of Neuromuscular Disorders Specialists, Medical Center “Practical Neurology</institution></aff><aff><institution xml:lang="ru">Региональная общественная организация «Общество специалистов по нервно-мышечным болезням», Медицинский центр Практическая неврология</institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">Hereditary metabolic diseases laboratory, Reseasrch Center of Medical Genetics</institution></aff><aff><institution xml:lang="ru">ФГБНУ Медико-генетический научный центр им. академика Н.П. Бочкова</institution></aff></aff-alternatives><aff-alternatives id="aff4"><aff><institution xml:lang="en">Dagestan State Medical University, Ministry of Health of Russia</institution></aff><aff><institution xml:lang="ru">ФГБОУ ВО «Дагестанский государственный медицинский университет» Минздрава России</institution></aff></aff-alternatives><aff-alternatives id="aff5"><aff><institution xml:lang="en">Reseasrch Center of Medical Genetics</institution></aff><aff><institution xml:lang="ru">ФГБНУ Медико-генетический научный центр им. академика Н.П. Бочкова</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2019-11-20" publication-format="electronic"><day>20</day><month>11</month><year>2019</year></pub-date><volume>9</volume><issue>3</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>67</fpage><lpage>76</lpage><history><date date-type="received" iso-8601-date="2019-11-20"><day>20</day><month>11</month><year>2019</year></date><date date-type="accepted" iso-8601-date="2019-11-20"><day>20</day><month>11</month><year>2019</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2019, Kurbatov S.A., Tsygankova P.G., Mollaeva K.Y., Bychkov I.O., Itkis Y.S., Zabnenkova V.V., Umakhanova Z.R., Geybatova L.G., Zakharova E.Y.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2019, Курбатов С.А., Цыганкова П.Г., Моллаева К.Ю., Бычков И.О., Иткис Ю.С., Забненкова В.В., Умаханова З.Р., Гейбатова Л.Г., Захарова Е.Ю.</copyright-statement><copyright-year>2019</copyright-year><copyright-holder xml:lang="en">Kurbatov S.A., Tsygankova P.G., Mollaeva K.Y., Bychkov I.O., Itkis Y.S., Zabnenkova V.V., Umakhanova Z.R., Geybatova L.G., Zakharova E.Y.</copyright-holder><copyright-holder xml:lang="ru">Курбатов С.А., Цыганкова П.Г., Моллаева К.Ю., Бычков И.О., Иткис Ю.С., Забненкова В.В., Умаханова З.Р., Гейбатова Л.Г., Захарова Е.Ю.</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/">https://creativecommons.org/licenses/by/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://nmb.abvpress.ru/jour/article/view/345">https://nmb.abvpress.ru/jour/article/view/345</self-uri><abstract xml:lang="en"><p><bold>Introduction.</bold> Mitochondrial myopathy with thymidine kinase 2 deficiency and spinal muscular atrophy 5q (SMA-5q) are two potentially curable hereditary diseases with different levels of damage to the neuromuscular system and etiology. Early childhood forms have a similar phenotype and are difficult for differential diagnosis.</p><p><bold>The aim of the study</bold> — the description of the clinical and paraclinical characteristics of the mitochondrial myopathy with TK2 deficiency and informing health care specialists about the possibility of optimizing differential diagnosis.</p><p><bold>Materials and methods</bold>. This study involved patients with a previously excluded by molecular genetic method a spinal muscular atrophy 5q diagnosis. Clinical and paraclinical descriptions are presented for 5 patients from 3 families. In addition, 96 patient samples were obtained from the archive of the Research Center for Medical Genetics. The diagnosis based on the clinical and paraclinical features of the disease and the detection of mutations in TK2 gene by sequencing of the NGS panel or TK2 gene directly.</p><p><bold>Results</bold>. Eight patients with mitochondrial myopathy with TK2 from 5 unrelated families have been diagnosed. Three of them have been found retrospectively by analyze of 96 spinal muscular atrophy 5q negative samples.</p><p><bold>Conclusions.</bold> Clinical and molecular genetic characteristics of mitochondrial myopathy with TK2 are presented. The feasibility of differential diagnosis of this rare myopathy with other neuromuscular diseases, including such frequent as spinal muscular atrophy 5q, is shown. The study revealed four previously undescribed mutations in the TK2 gene (c.169G&gt;A (p.Gly57Ser), c.310C&gt;T (p.Arg104Cys), c.338T&gt;A (p.Val113Glu), c.655T&gt;C(p.Trp219Arg)).</p></abstract><trans-abstract xml:lang="ru"><p><bold>Введение.</bold> Митохондриальная миопатия с недостаточностью тимидинкиназы 2 (ТК2) и спинальная мышечная атрофия 5q — два потенциально курабельных наследственных заболевания с различным уровнем поражения нервно-мышечной системы и этиологией. Ранние детские формы имеют схожий фенотип, сложный для дифференциальной диагностики.</p><p><bold>Цель исследования</bold> — описание клинико-параклинических характеристик митохондриальной миопатии с недостаточностью ТК2, информирование специалистов о возможности оптимизации дифференциальной диагностики.</p><p><bold>Материалы и методы</bold>. Всем больным, включенным в обследование, предварительно по результатам молекулярных исследований был исключен диагноз «спинальная мышечная атрофия 5q». Клинико-параклинические описания представлены по 5 пациентам из 3 семей. От 96 пациентов представлен только биоматериал. Диагноз устанавливался на основании клинико-параклинических особенностей проявления заболевания и выявлением мутаций методами прямого секвенирования гена TK2 или с применением таргетных NGS-панелей.</p><p><bold>Результаты.</bold> Диагностировано 8 больных c митохондриальной миопатией с недостаточностью ТК2 из 5неродственных семей, из них 3 больных — ретроспективно при скрининге 96 биообразцов.</p><p><bold>Выводы.</bold> Приведена клиническая и молекулярно-генетическая характеристика митохондриальной миопатии с недостаточностью ТК2. Показана необходимость дифференциальной диагностики этой редкой патологии с другими нервно-мышечными заболеваниями, в том числе таким частым, как спинальная мышечная атрофия 5q. В результате исследования выявлены 4ранее не описанные мутации в гене TK2 (c.169G&gt;A (p.Gly57Ser), c.310C&gt;T(p.Arg104Cys), c.338T&gt;A (p.Val113Glu), c.655T&gt;C (p.Trp219Arg)).</p></trans-abstract><kwd-group xml:lang="en"><kwd>thymidine kinase 2</kwd><kwd>mitochondrial myopathy</kwd><kwd>spinal muscular atrophy</kwd><kwd>magnetic resonance imaging</kwd><kwd>mtDNA depletion</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>тимидинкиназа 2</kwd><kwd>митохондриальная миопатия</kwd><kwd>спинальная мышечная атрофия</kwd><kwd>магнитно-резонансная томография</kwd><kwd>истощение мтДНК</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">1.	Alberio S., Mineri R., Tiranti V., Zeviani M. Depletion of mtDNA: syndromes and genes. Mitochondrion 2007;7:6-12. PMID: 17280874. 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