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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.2026.268</article-id><article-id custom-type="elpub" pub-id-type="custom">epilepsia-1349</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>Intrafamilial clinical polymorphism of CACNA1A-related disorders</article-title><trans-title-group xml:lang="ru"><trans-title>Внутрисемейный клинический полиморфизм заболеваний, связанных с геном CACNA1A</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, проф.</p><p>ул. Петропавловская, д. 26, Пермь 614000</p><p>ул. Букирева, д. 15,  Пермь 614068</p></bio><bio xml:lang="en"><p>Aleksandr G. Malov, Dr. Sci. Med., Assoc. Prof., Prof. </p><p>26 Petropavlovskaya Str., Perm 614000</p><p>15 Bukireva Str., Perm 614068</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/0000-0002-3637-6902</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Калашникова</surname><given-names>Т. П.</given-names></name><name name-style="western" xml:lang="en"><surname>Kalashnikova</surname><given-names>T. P.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Калашникова Татьяна Павловна, д.м.н., проф.</p><p>ул. Петропавловская, д. 26, Пермь 614000</p></bio><bio xml:lang="en"><p>Tatyana P. Kalashnikova, Dr. Sci. Med., Prof.</p><p>26 Petropavlovskaya 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/0009-0007-5679-729X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Цымбал</surname><given-names>О. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Tsymbal</surname><given-names>O. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Цымбал Ольга Ивановна</p><p>Комсомольский пр-т, д. 43, Пермь 614000</p></bio><bio xml:lang="en"><p>Olga I. Tsymbal </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; Федеральное государственное бюджетное образовательное учреждение высшего образования «Пермский государственный национальный исследовательский университет»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Vagner Perm State Medical University; Perm State National Research University</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><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-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 Clinical Hospital</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2026</year></pub-date><pub-date pub-type="epub"><day>03</day><month>08</month><year>2026</year></pub-date><volume>18</volume><issue>2</issue><elocation-id>153–157</elocation-id><permissions><copyright-statement>Copyright &amp;#x00A9; Malov A.G., Kalashnikova T.P., Tsymbal O.I., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Малов А.Г., Калашникова Т.П., Цымбал О.И.</copyright-holder><copyright-holder xml:lang="en">Malov A.G., Kalashnikova T.P., Tsymbal O.I.</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/1349">https://www.epilepsia.su/jour/article/view/1349</self-uri><abstract><p>CACNA1A-related disorders include developmental and epileptic encephalopathy type 42, familial hemiplegic migraine type 1, episodic ataxia type 2, and spinocerebellar ataxia type 6 with common сombined phenotypes observed. This article presents a case of intrafamilial clinical polymorphism with same CACNA1A gene mutation. In the father, episodes of ataxia with dizziness, observed over a 10-year period (from ages 7 to 17) were solely presented. The eldest son, in addition to episodic ataxia documented since age of three years old, experienced short absences starting from age 10, as well as delayed psycho-speech development. In the youngest son, onset of paroxysms of episodic ataxia was recorded at age 2, absences – at age 3, whereas disability due to psycho-speech underdevelopment was documented at age 5.</p></abstract><trans-abstract xml:lang="ru"><p>Заболевания, связанные с геном CACNA1A, включают энцефалопатию развития и эпилептическую энцефалопатию 42-го типа, семейную гемиплегическую мигрень 1-го типа, эпизодическую атаксию 2-го типа и спиноцеребеллярную атаксию 6-го типа. Нередко встречаются комбинированные фенотипы. В статье представлен пример внутрисемейного клинического полиморфизма при одинаковой мутации в гене CACNA1A. У отца единственным признаком заболевания были эпизоды атаксии с головокружением, наблюдавшиеся в течение 10 лет (с 7 до 17 лет). У старшего сына кроме приступов эпизодической атаксии с 3 лет отмечались короткие абсансы с 10 лет, а также задержка психоречевого развития. У младшего сына пароксизмы эпизодической атаксии дебютировали в 2 года, абсансы – в 3 года, а психоречевое недоразвитие привело к оформлению инвалидности в возрасте 5 лет.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>генетические заболевания</kwd><kwd>клинический полиморфизм</kwd><kwd>каналопатии</kwd><kwd>ген CACNA1A</kwd></kwd-group><kwd-group xml:lang="en"><kwd>genetic diseases</kwd><kwd>clinical polymorphism</kwd><kwd>channelopathies</kwd><kwd>CACNA1A gene</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">Bozkaya-Yilmaz S., Olgac-Dundar N., Aliyeva N., et al. Phenotypic variability in cases with CACNA1A mutation. Eur J Pediatr. 2025; 184 (4): 261. https://doi.org/10.1007/s00431-025-06062-3.</mixed-citation><mixed-citation xml:lang="en">Bozkaya-Yilmaz S., Olgac-Dundar N., Aliyeva N., et al. Phenotypic variability in cases with CACNA1A mutation. 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