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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">Russian Journal of Child Neurology</journal-id><journal-title-group><journal-title xml:lang="en">Russian Journal of Child Neurology</journal-title><trans-title-group xml:lang="ru"><trans-title>Русский журнал детской неврологии</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2073-8803</issn><issn publication-format="electronic">2412-9178</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">316</article-id><article-id pub-id-type="doi">10.17650/2073-8803-2019-14-4-32-37</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>CLINICAL OBSERVATIONS</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>КЛИНИЧЕСКИЕ НАБЛЮДЕНИЯ</subject></subj-group><subj-group subj-group-type="article-type"><subject></subject></subj-group></article-categories><title-group><article-title xml:lang="en">Kleefstra syndrome and epilepsy</article-title><trans-title-group xml:lang="ru"><trans-title>Синдром Клифстра и эпилепсия</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-8582-592X</contrib-id><name-alternatives><name xml:lang="en"><surname>Gamirova</surname><given-names>R. G.</given-names></name><name xml:lang="ru"><surname>Гамирова</surname><given-names>Р. Г.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>11 Mushtari St., Kazan 420012, Russia; 18 Kremlevskaya St., Kazan 420000, Russia</p></bio><bio xml:lang="ru"><p>Римма Габдульбаровна Гамирова, Россия, 420012 Казань, ул. Муштари, 11; Россия, 420008 Казань, ул. Кремлевская, 18</p></bio><email>r-gamirov@mail.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Lyukshina</surname><given-names>N. G.</given-names></name><name xml:lang="ru"><surname>Люкшина</surname><given-names>Н. Г.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>43 Leningradskaya St., Togliatti 445020, Russia</p></bio><bio xml:lang="ru"><p>Россия, 445020 Тольятти, ул. Ленинградская, 43</p></bio><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Gamirova</surname><given-names>R. R.</given-names></name><name xml:lang="ru"><surname>Гамирова</surname><given-names>Р. Р.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>18 Kremlevskaya St., Kazan 420000, Russia</p></bio><bio xml:lang="ru"><p>Россия, 420008 Казань, ул. Кремлевская, 18</p></bio><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Farnosova</surname><given-names>M. E.</given-names></name><name xml:lang="ru"><surname>Фарносова</surname><given-names>М. Е.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>11 Bari Galeeva St., Kazan 420061, Russia</p></bio><bio xml:lang="ru"><p>Россия, 420061 Казань, ул. Бари Галеева, 11</p></bio><xref ref-type="aff" rid="aff4"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Kazan State Medical Academy, branch of the Russian Medical Academy of Postgraduate Education, Ministry of Health of Russia</institution></aff><aff><institution xml:lang="ru">Казанская государственная медицинская академия – филиал ФГБОУ ДПО «Российская медицинская академия непрерывного профессионального образования» Минздрава России</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Kazan Federal University</institution></aff><aff><institution xml:lang="ru">ФГАОУ ВО «Казанский (Приволжский) федеральный университет»</institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">Medical Center "MIDEAL"</institution></aff><aff><institution xml:lang="ru">Медицинский центр «МИДЕАЛ»</institution></aff></aff-alternatives><aff-alternatives id="aff4"><aff><institution xml:lang="en">Children's City Hospital No. 8</institution></aff><aff><institution xml:lang="ru">ГАУЗ «Детская городская больница № 8» г. Казани</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2019-12-15" publication-format="electronic"><day>15</day><month>12</month><year>2019</year></pub-date><volume>14</volume><issue>4</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>32</fpage><lpage>37</lpage><history><date date-type="received" iso-8601-date="2020-05-16"><day>16</day><month>05</month><year>2020</year></date><date date-type="accepted" iso-8601-date="2020-05-16"><day>16</day><month>05</month><year>2020</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2019, ABV-Press</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2019, АБВ-пресс</copyright-statement><copyright-year>2019</copyright-year><copyright-holder xml:lang="en">ABV-Press</copyright-holder><copyright-holder xml:lang="ru">АБВ-пресс</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://rjdn.abvpress.ru/jour/about/editorialPolicies</ali:license_ref></license></permissions><self-uri xlink:href="https://rjdn.abvpress.ru/jour/article/view/316">https://rjdn.abvpress.ru/jour/article/view/316</self-uri><abstract xml:lang="en"><p>Kleefstra syndrome is a rare autosomal dominant genetic disorder caused by haploinsufficiency of the EHMT1 (Euchromatic Histone MethylTransferase 1). Patients with Kleefstra syndrome have following most common symptoms: moderate or severe intellectual deficiency, absence of speech, significant diffuse muscular hypotonia, micro-brachycephaly, congenital defects of heart, kidneys, genitourinary tract and recognizable dysmorphic features of face. The article presents 2 similar clinical cases of Kleefstra syndrome in combination with epilepsy. Both patients, along with a typical clinical picture of the underlying disease, have serial epileptic spasms with an onset after first year of life, modified hypsarrhythmia with tendency to synchronization on the electroencephalogram, pharmacoresistant epilepsy. This indicates that Kleefstra syndrome can include epilepsy as one of symptoms of the disease.</p></abstract><trans-abstract xml:lang="ru"><p>Синдром Клифстра – редкое генетическое аутосомно-доминантное заболевание, обусловленное гаплоинтенсивностью EHMT1 (Euchromatic Histone Methyltransferase 1). Клиническая картина синдрома Клифстра включает умеренную или тяжелую интеллектуальную недостаточность с отсутствием речи, выраженную мышечную гипотонию, микробрахицефалию, врожденные пороки сердца, почек, урогенитального тракта, типичный для синдрома лицевой дисморфизм. В статье представлены 2 схожих клинических случая сочетания синдрома Клифстра с эпилепсией. У обоих пациентов наряду с типичной картиной основного заболевания в клинике отмечаются серийные эпилептические спазмы с дебютом после 1‑го года, модифицированная, склонная к синхронизации гипсаритмия на электроэнцефалограмме, фармакорезистентное течение эпилепсии. Это может свидетельствовать о том, что синдром Клифстра может включать развитие эпилепсии как один из симптомов заболевания.</p></trans-abstract><kwd-group xml:lang="en"><kwd>Kleefstra syndrome</kwd><kwd>epilepsy</kwd><kwd>epileptic spasms</kwd><kwd>gene EHMT1</kwd><kwd>clinical case</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>синдром Клифстра</kwd><kwd>эпилепсия</kwd><kwd>эпилептические спазмы</kwd><kwd>ген EHMT1</kwd><kwd>клинический случай</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">Farnosova M.E., Gamirova R.G. Comparative analysis of therapy outcomes in patients with West syndrome receiving tetraсosactidе and other antiepileptic drugs. Russkiy zhurnal detskoy nevrologii = Russian Journal of Child Neurology 2017;12(3):44–50. (In Russ.) DOI: 10.17650/2073-8803-2017-12-3-44-50.</mixed-citation><mixed-citation xml:lang="ru">Фарносова М.Е., Гамирова Р.Г. 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