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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="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Annals of Clinical and Experimental Neurology</journal-id><journal-title-group><journal-title xml:lang="en">Annals of Clinical and Experimental Neurology</journal-title><trans-title-group xml:lang="ru"><trans-title>Анналы клинической и экспериментальной неврологии</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2075-5473</issn><issn publication-format="electronic">2409-2533</issn><publisher><publisher-name xml:lang="en">Eco-Vector</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">1447</article-id><article-id pub-id-type="doi">10.17816/ACEN.1447</article-id><article-id pub-id-type="edn">VNAVQJ</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Clinical analysis</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Клинический разбор</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">A clinical case of hereditary transthyretin amyloidosis with predominant involvement of the peripheral nervous system</article-title><trans-title-group xml:lang="ru"><trans-title>Клинический случай наследственного транстиретинового амилоидоза с преимущественным поражением периферической нервной системы</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0006-2233-2040</contrib-id><name-alternatives><name xml:lang="en"><surname>Guseva</surname><given-names>Elizaveta A.</given-names></name><name xml:lang="ru"><surname>Гусева</surname><given-names>Елизавета Алексеевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>neurologist</p></bio><bio xml:lang="ru"><p>врач-невролог</p></bio><email>annaly-nevrologii@neurology.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3956-6362</contrib-id><name-alternatives><name xml:lang="en"><surname>Suponeva</surname><given-names>Natalia A.</given-names></name><name xml:lang="ru"><surname>Супонева</surname><given-names>Наталья Александровна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Dr. Sci. (Med.), Corr. member of RAS, Director, Institute of Neurorehabilitation</p></bio><bio xml:lang="ru"><p>д-р мед. наук, член-корр. РАН, директор Института нейрореабилитации и восстановительных технологий</p></bio><email>annaly-nevrologii@neurology.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0009-8303-9130</contrib-id><name-alternatives><name xml:lang="en"><surname>Mukhacheva</surname><given-names>Marianna V.</given-names></name><name xml:lang="ru"><surname>Мухачева</surname><given-names>Марианна Витальевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Cand. Sci. (Med.), Head, Department of neurology</p></bio><bio xml:lang="ru"><p>канд. мед. наук, зав. неврологическим отделением</p></bio><email>annaly-nevrologii@neurology.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Kirov Regional Clinical Hospital</institution></aff><aff><institution xml:lang="ru">Кировская областная клиническая больница</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Russian Center of Neurology and Neurosciences</institution></aff><aff><institution xml:lang="ru">Российский центр неврологии и нейронаук</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2026-04-07" publication-format="electronic"><day>07</day><month>04</month><year>2026</year></pub-date><volume>20</volume><issue>1</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>95</fpage><lpage>103</lpage><history><date date-type="received" iso-8601-date="2025-11-12"><day>12</day><month>11</month><year>2025</year></date><date date-type="accepted" iso-8601-date="2025-12-15"><day>15</day><month>12</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2026, Guseva E.A., Suponeva N.A., Mukhacheva M.V.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2026, Гусева Е.А., Супонева Н.А., Мухачева М.В.</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="en">Guseva E.A., Suponeva N.A., Mukhacheva M.V.</copyright-holder><copyright-holder xml:lang="ru">Гусева Е.А., Супонева Н.А., Мухачева М.В.</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://creativecommons.org/licenses/by/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://annaly-nevrologii.com/pathID/article/view/1447">https://annaly-nevrologii.com/pathID/article/view/1447</self-uri><abstract xml:lang="en"><p>Hereditary transthyretin amyloidosis is a fatal systemic progressive disease caused by mutations in the transthyretin (TTR) gene, inherited in an autosomal dominant pattern, primarily affecting the peripheral and autonomic nervous systems and the heart, as well as the kidneys, liver, eyes, and gastrointestinal tract, leading to disability and a fatal outcome.</p> <p>The article presents a clinical case of hereditary transthyretin amyloidosis with predominant polyneuropathy manifestations in a 61-year-old male patient, caused by the most common variant of TTR gene mutation — the Val30Met mutation. An analysis and summary of the symptoms of transthyretin amyloidosis caused by the Val30Met mutation in the TTR gene, with early and late disease onset, were conducted.</p></abstract><trans-abstract xml:lang="ru"><p>Наследственный транстиретиновый амилоидоз — это фатальное системное прогрессирующее заболевание, вызванное мутациями в гене транстиретина (TTR), наследуемое по аутосомно-доминантному типу, преимущественно поражающее периферическую и вегетативную нервную систему и сердце, а также почки, печень, глаза, желудочно-кишечный тракт, приводящее к инвалидизации и летальному исходу.</p> <p>В статье представлен клинический случай наследственного транстиретинового амилоидоза у пациента 61 года с преимущественным развитием явлений полинейропатии, вызванного наиболее часто встречающимся вариантом мутации в гене TTR — Val30Met. Проведены анализ и обобщение симптоматики транстиретинового амилоидоза, вызванного мутацией Val30Met в гене TTR, при раннем и позднем начале развития заболевания.</p></trans-abstract><kwd-group xml:lang="en"><kwd>hereditary transthyretin amyloidosis</kwd><kwd>amyloid polyneuropathy</kwd><kwd>Val30Met mutation</kwd><kwd>phenotype variability</kwd><kwd>molecular genetic testing</kwd><kwd>electroneuromyography</kwd><kwd>whole-body scintigraphy</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>наследственный транстиретиновый амилоидоз</kwd><kwd>амилоидная полинейропатия</kwd><kwd>мутация Val30Met</kwd><kwd>вариабельность фенотипа</kwd><kwd>молекулярно-генетическое исследование</kwd><kwd>электронейромиография</kwd><kwd>сцинтиграфия в режиме whole body</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Никитин С.С., Бардаков С.Н., Супонева Н.А. и др. 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