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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-1815</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>Множественные мутации в генах, ассоциированных с синдромом LQTS, у пациентов с жизнеугрожающими желудочковыми тахиаритмиями</article-title><trans-title-group xml:lang="en"><trans-title>Multiple mutations in associated with LQTS genes in patients with life-threating ventricular tachyarrhythmias</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>Чакова</surname><given-names>Н. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Chakova</surname><given-names>N. .</given-names></name></name-alternatives><email xlink:type="simple">n.chakova@igc.by</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>Комиссарова</surname><given-names>С. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Komissarova</surname><given-names>S. .</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>Ниязова</surname><given-names>С. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Niyazova</surname><given-names>S. .</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>Долматович</surname><given-names>Т. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Dolmatovich</surname><given-names>T. .</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>Ребеко</surname><given-names>Е. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Rebeko</surname><given-names>E. .</given-names></name></name-alternatives><email xlink:type="simple">noemail@neicon.ru</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>ГНУ «Институт генетики и цитологии Национальной Академия Наук Беларуси»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>State scientific institution «The Institute of Genetics and Cytology of the National Academy of Sciences of Belarus</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>ГУ «Республиканский научно-практический центр «Кардиология»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Republican Scientific and Practical Centre «Cardiology»</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2020</year></pub-date><pub-date pub-type="epub"><day>02</day><month>02</month><year>2021</year></pub-date><volume>19</volume><issue>12</issue><fpage>47</fpage><lpage>55</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Чакова Н.Н., Комиссарова С.М., Ниязова С.С., Долматович Т.В., Ребеко Е.С., 2021</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="ru">Чакова Н.Н., Комиссарова С.М., Ниязова С.С., Долматович Т.В., Ребеко Е.С.</copyright-holder><copyright-holder xml:lang="en">Chakova N..., Komissarova S..., Niyazova S..., Dolmatovich T..., Rebeko E...</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/1815">https://www.medgen-journal.ru/jour/article/view/1815</self-uri><abstract><p>Синдром удлиненного интервала QT (LQTS) представляет собой генетически детерминированное заболевание, характеризующееся удлинением интервала QT на электрокардиограмме, высоким риском жизнеугрожающих аритмий и внезапной сердечной смерти. Причиной данного синдрома являются мутации в генах, кодирующих белки ионных каналов, а также протеины, опосредованно связанные с ионными каналами. От 4,5 до 8% пациентов с LQTS имеют более одной мутации в генах, связанных с развитием каналопатий. Цель работы: описание двух клинических случаев пациентов с жизнеугрожающими аритмиями, у которых выявлено сочетание редких мутантных аллелей в генах, ассоциированных с LQTS. Клиническое обследование включало ЭКГ в 12 отведениях, ЭхоКГ, МРТ сердца с отсроченным контрастированием и суточное мониторирование ЭКГ (СМ ЭКГ). Генетическое тестирование выполнено методом высокопроизводительного секвенирования (NGS) с использованием набора реагентов «TruSight™ Cardio Sequencing Panel» (Illumina). Оба пациента без отягощенного семейного анамнеза имели злокачественные желудочковые тахиаритмии, которые потребовали имплантации кардиовертера-дефибриллятора. В результате проведенного генотипирования методом NGS у пациента с идиопатической желудочковой тахикардией выявлено сочетание замен в генах ANK2 (c.9161C&gt;G, p.Ala3054Gly, rs139007578) и KCNE1 (c.253G&gt;A, p.Asp85Asn, rs1805128). У пациента с идиопатической фибрилляцией желудочков обнаружен аллельный вариант также в гене ANK2 (c.1397C&gt;T, p.Thr466Met, rs786205722) и дополнительная замена в гене SNTA1 (c.787G&gt;T, (p.Ala263Ser), rs150576530). При наличии у пациентов нескольких генетических дефектов может наблюдаться «кумулятивный эффект» мутаций, фенотипически проявляющийся тяжелым течением заболевания с неблагоприятными исходами. Показано, что при генотипировании пациентов с идиопатическими жизнеугрожающими тахиаритмиями использование панелей с большим количеством генов, ассоциированных с сердечно-сосудистой патологией, является вполне оправданным. Комплексное исследование генов позволяет увеличить диагностическую и прогностическую ценность генетического скрининга.</p></abstract><trans-abstract xml:lang="en"><p>Long QT syndrome (LQTS) is the genetically determined disease characterized by the QT interval elongation at the electrocardiogram, a high risk of life-threatening arrhythmias and sudden cardiac death. This syndrome is determined by mutations in genes encoding ion channel proteins, as well as proteins indirectly associated with ion channels. 4.5-8% of patients with LQTS have more than one mutation in the genes associated with the development of channelopathies. Purpose of work: description of two clinical cases of patients with life-threatening arrhythmia in which a combination of rare mutant alleles in the genes associated with LQTS was detected. The clinical examination included 12-lead ECG, echocardiography, cardiac MRI with delayed contrast, and 24-hour ECG monitoring (SM ECG). Genetic testing was performed by next generation sequencing (NGS) using the TruSight ™ Cardio Sequencing Panel reagent kit (Illumina). Both patients with no burdened family history had malignant ventricular tachyarrhythmias, which required the implantation of a cardioverter defibrillator. The NGS method allowed to detect a combination of substitutions in the genes ANK2 (c.9161C&gt;G, p.Ala3054Gly, rs139007578) and KCNE1 (c.253G&gt;A, p.Asp85Asn, rs1805128) in a patient with idiopathic ventricular tachycardia. In the patient with idiopathic ventricular fibrillation, the allelic variant was also found in the gene ANK2 (c.1397C&gt;T, p.Thr466Met, rs786205722) and an additional substitution in the gene SNTA1 (c.1877&gt;T, (p.Ala263Ser), rs150576530). If patients have several genetic defects, a “cumulative effect” of mutations can be observed, phenotypically manifested by a severe course of the disease with unfavorable outcomes. It has been shown that when genotyping patients with idiopathic life-threatening tachyarrhythmias, the use of panels with a large number of genes associated with cardiovascular pathology is quite justified. A comprehensive study of genes can increase the diagnostic and prognostic value of genetic screening.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>синдром удлиненного интервала QT</kwd><kwd>множественные мутации</kwd><kwd>высокопроизводительное секвенирование (NGS)</kwd><kwd>фенотипические проявления</kwd></kwd-group><kwd-group xml:lang="en"><kwd>long QT syndrome</kwd><kwd>multiple mutations</kwd><kwd>next generation sequencing (NGS)</kwd><kwd>phenotypic manifestations</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">Schwartz P.J., Crotti L., Insolia R. 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