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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="en"><front><journal-meta><journal-id journal-id-type="publisher-id">epilepsia</journal-id><journal-title-group><journal-title xml:lang="en">Epilepsy and paroxysmal conditions</journal-title><trans-title-group xml:lang="ru"><trans-title>Эпилепсия и пароксизмальные состояния</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2077-8333</issn><issn pub-type="epub">2311-4088</issn><publisher><publisher-name>IRBIS LLC</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.17749/2077-8333/epi.par.con.2025.221</article-id><article-id custom-type="elpub" pub-id-type="custom">epilepsia-1211</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="en"><subject>CLINICAL CASES</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>КЛИНИЧЕСКИЕ СЛУЧАИ</subject></subj-group></article-categories><title-group><article-title>Severe KCNT1-related developmental and epileptic encephalopathy</article-title><trans-title-group xml:lang="ru"><trans-title>Тяжелое течение энцефалопатии развития и эпилептической энцефалопатии, связанной с KSNT1</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-2946-9158</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Малов</surname><given-names>А. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Malov</surname><given-names>A. G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Малов Александр Германович, д.м.н., доцент</p><p>ул. Петропавловская, д. 26, Пермь 614000</p></bio><bio xml:lang="en"><p>Aleksandr G. Malov, Dr. Sci. Med., Assoc. Prof.</p><p>26 Petropavlovskaya Str., Perm 614000</p></bio><email xlink:type="simple">malovag1959@mail.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/0000-0001-9499-7013</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Брохин</surname><given-names>Л. Ю.</given-names></name><name name-style="western" xml:lang="en"><surname>Brokhin</surname><given-names>L. Yu.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Брохин Леонид Юрьевич</p><p>ул. Ленина, д. 13, Пермь 614015</p></bio><bio xml:lang="en"><p>Leonid Yu. Brokhin</p><p>13 Lenin Str., Perm 614000</p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0003-6056-2320</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Веселкова</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Veselkova</surname><given-names>A. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Веселкова Ангелина Владимировна</p><p>Комсомольский пр-т, д. 43, Пермь 614000</p></bio><bio xml:lang="en"><p>Angelina V. Veselkova</p><p>43 Komsomolsky Ave, Perm 614000</p></bio><xref ref-type="aff" rid="aff-3"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Федеральное государственное бюджетное образовательное учреждение высшего образования «Пермский государственный медицинский университет им. академика Е.А. Вагнера» Министерства здравоохранения Российской Федерации</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Vagner Perm State Medical University</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Государственное бюджетное учреждение здравоохранения Пермского края «Детская клиническая больница № 3 им. И.П. Корюкиной»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Koryukina Children's Clinical Hospital No. 3</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-3"><aff xml:lang="ru"><institution>Государственное бюджетное учреждение здравоохранения Пермского края «Детская клиническая больница им. П.И. Пичугина»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Pichugin Children's Clinical Hospital</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>18</day><month>07</month><year>2025</year></pub-date><volume>17</volume><issue>2</issue><fpage>182</fpage><lpage>188</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Malov A.G., Brokhin L.Y., Veselkova A.V., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Малов А.Г., Брохин Л.Ю., Веселкова А.В.</copyright-holder><copyright-holder xml:lang="en">Malov A.G., Brokhin L.Y., Veselkova A.V.</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.epilepsia.su/jour/article/view/1211">https://www.epilepsia.su/jour/article/view/1211</self-uri><abstract><p>Developmental and epileptic encephalopathy (DEE) caused by a mutation in the KCNT1 gene (KCNT1-DEE) is registered in the Online Mendelian Inheritance in Man (OMIM) catalogue inder code number 614959. Alternative names: DEE 14, early infantile epileptic encephalopathy 14. KCNT1-DEE most often manifests as a syndrome of “epilepsy in infancy with migrating focal seizures”. However, the course of epilepsies due to mutant KCNT1 gene is characterized by a broad clinical polymorphism. The article describes a child with severe KCNT1-DEE with clinical picture dominated by drug-resistant focal seizures, profound mental retardation and spastic tetraparesis, as well as microcephaly and microsomia.</p></abstract><trans-abstract xml:lang="ru"><p>Энцефалопатия развития и эпилептическая энцефалопатия (англ. developmental and epileptic encephalopathy, DEE), вызванная мутацией в гене KCNT1 (KCNT1-DEE), зарегистрирована в каталоге Online Mendelian Inheritance in Man (OMIM) под кодовым номером 614959. Альтернативные названия: DEE 14-го типа, ранняя инфантильная эпилептическая энцефалопатия 14-го типа. KCNT1-DEE чаще всего проявляется синдромом «эпилепсия младенчества с мигрирующими фокальными приступами» (англ. epilepsy in infancy with migrating focal seizures). Однако течение эпилепсий, вызванных мутациями в гене KCNT1, отличается значительным клиническим полиморфизмом. В статье описан случай тяжелого течения KCNT1-DEE у ребенка. В клинической картине доминировали фармакорезистентные фокальные приступы, глубокая умственная отсталость и спастический тетрапарез, а также микроцефалия и микросомия.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>энцефалопатия развития и эпилептическая энцефалопатия</kwd><kwd>связанная с KSNT1</kwd><kwd>энцефалопатия развития и эпилептическая энцефалопатия 14-го типа</kwd><kwd>ранняя инфантильная эпилептическая энцефалопатия 14-го типа</kwd></kwd-group><kwd-group xml:lang="en"><kwd>KCNT1-related developmental and epileptic encephalopathy</kwd><kwd>developmental and epileptic encephalopathy 14</kwd><kwd>early infantile epileptic encephalopathy type 14</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">Lim C.X., Ricos M.G., Dibbens L.M., Heron S.E. KCNT1 mutations in seizure disorders: the phenotypic spectrum and functional effects. 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