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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">neurojour</journal-id><journal-title-group><journal-title xml:lang="ru">Неврологический журнал имени Л.О. Бадаляна</journal-title><trans-title-group xml:lang="en"><trans-title>L.O. Badalyan Neurological Journal</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2686-8997</issn><issn pub-type="epub">2712-794X</issn><publisher><publisher-name>ФГАУ «НМИЦ здоровья детей» Минздрава России</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.46563/2686-8997-2023-4-3-120-129</article-id><article-id custom-type="edn" pub-id-type="custom">laemcj</article-id><article-id custom-type="elpub" pub-id-type="custom">neurojour-103</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>Редкий случай синдрома Нунан, обусловленный биаллельными вариантами в гене LZTR1</article-title><trans-title-group xml:lang="en"><trans-title>A rare case of Noonan syndrome associated with biallelic variants in the LZTR1</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0890-7849</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Гандаева</surname><given-names>Лейла А.</given-names></name><name name-style="western" xml:lang="en"><surname>Gandaeva</surname><given-names>Leila 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"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7784-2837</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Каверина</surname><given-names>Валентина Геннадьевна</given-names></name><name name-style="western" xml:lang="en"><surname>Kaverina</surname><given-names>Valentina G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Младший научный сотрудник, врач-педиатр ФГАУ «Национальный медицинский исследовательский центр здоровья детей» Минздрава России, 119991, Москва.</p><p>e-mail: coverina.v@yandex.ru</p></bio><bio xml:lang="en"><p>Junior researcher, pediatrician, National Medical Research Center for Children’s Health, Moscow, 119991, Russian Federation.</p><p>e-mail: coverina.v@yandex.ru</p></bio><email xlink:type="simple">coverina.v@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-0144-2885</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Басаргина</surname><given-names>Елена Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Basargina</surname><given-names>Elena N.</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"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-6648-2063</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Пушков</surname><given-names>Александр А.</given-names></name><name name-style="western" xml:lang="en"><surname>Pushkov</surname><given-names>Alexander 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"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-4885-4171</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Савостьянов</surname><given-names>Кирилл В.</given-names></name><name name-style="western" xml:lang="en"><surname>Savostyanov</surname><given-names>Kirill V.</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>ФГАУ «Национальный медицинский исследовательский центр здоровья детей» Минздрава России</institution><country>Россия</country></aff><aff xml:lang="en"><institution>National Medical Research Center for Children’s Health</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>ФГАУ «Национальный медицинский исследовательский центр здоровья детей» Минздрава России; Клинический институт детского здоровья им. Н.Ф. Филатова ФГАОУ ВО «Первый Московский государственный медицинский университет им. И.М. Сеченова» Минздрава России (Сеченовский Университет)</institution><country>Россия</country></aff><aff xml:lang="en"><institution>National Medical Research Center for Children’s Health; Filatov Clinical Institute of Children’s Health at the Sechenov First Moscow State Medical University (Sechenov University)</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>19</day><month>10</month><year>2023</year></pub-date><volume>4</volume><issue>3</issue><fpage>120</fpage><lpage>129</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; ФГАУ «НМИЦ здоровья детей» Минздрава России, 2023</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="ru">ФГАУ «НМИЦ здоровья детей» Минздрава России</copyright-holder><copyright-holder xml:lang="en">ФГАУ «НМИЦ здоровья детей» Минздрава России</copyright-holder><license xlink:href="https://www.neuro-journal.ru/jour/about/submissions#copyrightNotice" xlink:type="simple"><license-p>https://www.neuro-journal.ru/jour/about/submissions#copyrightNotice</license-p></license></permissions><self-uri xlink:href="https://www.neuro-journal.ru/jour/article/view/103">https://www.neuro-journal.ru/jour/article/view/103</self-uri><abstract><sec><title>Введение</title><p>Введение. Cиндром Нунан — клинически и генетически гетерогенное заболевание с полиорганным вовлечением, ассоциированное с мутациями в генах сигнального пути RAS/MAPK. До 50–80% пациентов с синдромом Нунан имеют заболевания сердечно-сосудистой системы, которые представлены широким спектром врождённых пороков сердца и/или кардиомиопатией, преимущественно гипертрофическим фенотипом. Благодаря внедрению высокопроизводительного секвенирования знания о генетических причинах данного заболевания существенно расширились, и с 2014 г. в список генов, ответственных за развитие синдрома Нунан, был включен ген LZTR1 (OMIM 601247). Нуклеотидные варианты этого гена наследуются как по аутосомно-доминантному, так и по аутосомно-рецессивному типу, однако число публикаций, описывающих клинические и генетические особенности пациентов с мутациями гена LZTR1, в мировой научной литературе малочисленны.</p></sec><sec><title>Цель исследования</title><p>Цель исследования: описание клинических особенностей синдрома Нунан с аутосомно-рецессивным типом наследования, обусловленного биаллельными вариантами c.1259A&gt;G (p.Q420R) и c.2051Т&gt;С (p.I684T) в гене LZTR1.</p></sec><sec><title>Материалы и методы</title><p>Материалы и методы. Проведены подробный анализ данных анамнеза, результатов клинических, лабораторных и инструментальных исследований, молекулярно-генетическое исследование с использованием технологии высокопроизводительного секвенирования и прямого секвенирования по Сэнгеру. После верификации биаллельных вариантов у пробанда проведён поиск выявленных нуклеотидных замен в образцах венозной крови родителей и сибсов.</p></sec><sec><title>Результаты</title><p>Результаты. В статье представлены данные клинического наблюдения редкого случая синдрома Нунан, обусловленного патогенными вариантами в гене LZTR1 с аутосомно-рецессивным типом наследования, диагностированного на базе кардиологического отделения ФГАУ «НМИЦ здоровья детей» Минздрава России.</p></sec><sec><title>Заключение</title><p>Заключение. Разнообразие клинических проявлений затрудняет диагностику заболеваний из группы RAS-патий только на основании фенотипа. Возможность применения высокопроизводительного секвенирования повышает качество диагностики, способствует пополнению данных о новых патогенных вариантах и установлению генотип-фенотипических корреляций.</p><p>Соблюдение этических стандартов. Протокол исследования соответствует этическим принципам Хельсинкской декларации 1975 года, что отражено в предварительном одобрении комитета по исследованиям на людях ФГАУ «НМИЦ здоровья детей» Минздрава России и одобрено Этическим комитетом ФГАУ «НМИЦ» Минздрава России. Представителем пациента подписано информированное согласие на участие в исследовании и обработку персональных данных. Дизайн исследования одобрен этическим комитетом ФГАУ «НМИЦ здоровья детей» Минздрава России.</p></sec><sec><title>Участие авторов</title><p>Участие авторов:Гандаева Л.А. — концепция, редактирование текста;Каверина В.Г. — написание текста;Басаргина Е.Н. — редактирование текста;Пушков А.А. — редактирование текста;Савостьянов К.В. — концепция, редактирование текста.Все соавторы — утверждение окончательного варианта статьи, ответственность за целостность всех частей статьи.</p></sec><sec><title>Финансирование</title><p>Финансирование. Исследование не имело спонсорской поддержки.</p></sec><sec><title>Конфликт интересов</title><p>Конфликт интересов. Авторы статьи подтверждают отсутствие конфликта интересов.</p></sec><sec><title>Благодарности</title><p>Благодарности. Мы благодарим семью пациента, участвовавшую в данной работе, и выражаем благодарность директору ФГАУ «НМИЦ здоровья детей» Минздрава России доктору медицинских наук, профессору А.П. Фисенко за поддержку и техническую помощь в осуществлении данной работы.</p></sec><sec><title>Поступила 28</title><p>Поступила 28.06.2023Принята к печати 30.08.2023Опубликована 13.10.2023</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Introduction</title><p>Introduction. Noonan syndrome is a clinically and genetically heterogeneous disease with multiple organ involvement associated with mutations in the genes of the RAS/MAPK signalling pathway. Most patients with Noonan syndrom (up to 50–80%) have disorders of the cardiovascular system, presented by a wide range of congenital heart defects and/or cardiomyopathy, predominantly hypertrophic phenotype. Thanks to the introduction of high-throughput sequencing, knowledge of the genetic causes of Noonan syndrome has expanded significantly, so since 2014, the LZTR1 gene (OMIM 601247) has been included in the list of genes responsible for the development of Noonan syndrome. The nucleotide variants of this gene are known to be inherited both in an autosomal dominant and autosomal recessive manner. However, the number of reports describing the clinical and genetic characteristics of patients with LZTR1 gene mutations is scarce in the world scientific literature.</p></sec><sec><title>Objective</title><p>Objective. To describe the clinical features of Noonan syndrome with an autosomal recessive type of inheritance caused by biallelic variants c.1259A&gt;G (p.Q420R) and c.2051T&gt;C (p.I684T) in the LZTR1 gene.</p></sec><sec><title>Materials and methods</title><p>Materials and methods. A detailed analysis of the history data, the results of clinical, laboratory, and instrumental studies, a molecular genetic study using high-throughput sequencing technology and direct Sanger sequencing was carried out. After verifying the biallelic variants in the proband, a search was made for the identified nucleotide substitutions in the venous blood samples of the parents and sibs.</p></sec><sec><title>Results</title><p>Results. The article presents the data of a clinical observation of a rare case of Noonan syndrome caused by pathogenic variants in the LZTR1 gene with an autosomal recessive type of inheritance by the Department of Cardiology of the National Medical Research Center for Children’s Health of the Ministry of Health of Russia.</p></sec><sec><title>Conclusion</title><p>Conclusion. The diversity of clinical manifestations makes it difficult to diagnose Noonan syndrome based on phenotype alone. The possibility of using high-throughput sequencing improves the quality of diagnostics, contributes to the replenishment of data on new pathogenic variants and the establishment of genotype-phenotypic correlations.</p><p>Compliance with ethical standards. The study protocol conforms to the ethical guidelines of the 1975 Declaration of Helsinki as reflected in a priori approval by the institution’s human research committee and was approved by the Ethics. The design of the study was approved by the ethics committee of the National Research Center for Children’s Health of the Russian Ministry of Health.</p></sec><sec><title>Contribution</title><p>Contribution:Gandaeva L.A. — concept, editing;Kaverina V.G. — writing text;Basargina E.N. — editing;Pushkov A.A. — editing;Savostyanov K.V. — concept, editing.All co-authors are responsible for the  integrity of all parts of the manuscript and approval of its final version.</p></sec><sec><title>Conflict of interest</title><p>Conflict of interest. The authors declare no conflict of interest.</p></sec><sec><title>Acknowledgment</title><p>Acknowledgment. The study had no financial support. All authors are grateful to the patients and their families for their continuous contributions and support of our research. The authors express their gratitude to the director of the National Research Center for Children’s Health, professor A.P. Fisenko for support and technical assistance in the implementation of this work.</p></sec><sec><title>Received</title><p>Received: June 28, 2023Accepted: August 30, 2023Published: October 13, 2023</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>синдром Нунан</kwd><kwd>RAS-патии</kwd><kwd>гипертрофическая кардиомиопатия</kwd><kwd>RAS/MAPK сигнальный путь</kwd><kwd>LZTR1</kwd><kwd>молекулярно-генетическая диагностика</kwd><kwd>врождённый порок сердца</kwd><kwd>мышечная гипотония</kwd></kwd-group><kwd-group xml:lang="en"><kwd>Noonan Syndrome</kwd><kwd>Rasopathies</kwd><kwd>hypertrophic cardiomyopathy</kwd><kwd>RAS/MAPK signaling pathway</kwd><kwd>molecular genetic diagnosis</kwd><kwd>congenital heart defect</kwd><kwd>muscle hypotonia</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">Rauen K.A. Defining RASopathy. Dis. Model. 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