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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">medgen</journal-id><journal-title-group><journal-title xml:lang="ru">Медицинская генетика</journal-title><trans-title-group xml:lang="en"><trans-title>Medical Genetics</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2073-7998</issn><publisher><publisher-name>Publishing House «Genius Media» LLC</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.25557/2073-7998.2025.08.6-13</article-id><article-id custom-type="elpub" pub-id-type="custom">medgen-3109</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>ОРИГИНАЛЬНОЕ ИССЛЕДОВАНИЕ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>ORIGINAL ARTICLE</subject></subj-group></article-categories><title-group><article-title>Сиалурия: новое наблюдение редкой врожденной ошибки метаболизма</article-title><trans-title-group xml:lang="en"><trans-title>Sialuria: new observation of a rare inborn error of metabolism</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Гусина</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Gusina</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ася Александровна Гусина</p><p>220053; ул. Орловская, д. 66, корп. 9; Минск</p></bio><bio xml:lang="en"><p>Asya A. Gusina</p><p>220053; 66, build. 9, Orlovskaya st.; Minsk</p></bio><email xlink:type="simple">asya.gusina@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Калинина</surname><given-names>Е. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Kalinina</surname><given-names>E. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>220053; ул. Орловская, д. 66, корп. 9; Минск</p></bio><bio xml:lang="en"><p>220053; 66, build. 9, Orlovskaya st.; Minsk</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Зиновик</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Zinovik</surname><given-names>A. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>220053; ул. Орловская, д. 66, корп. 9; Минск</p></bio><bio xml:lang="en"><p>220053; 66, build. 9, Orlovskaya st.; Minsk</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Пашук</surname><given-names>С. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Pashuk</surname><given-names>S. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>220053; ул. Орловская, д. 66, корп. 9; Минск</p></bio><bio xml:lang="en"><p>220053; 66, build. 9, Orlovskaya st.; Minsk</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Гусина</surname><given-names>Н. Б.</given-names></name><name name-style="western" xml:lang="en"><surname>Gusina</surname><given-names>N. B.</given-names></name></name-alternatives><bio xml:lang="ru"><p>220053; ул. Орловская, д. 66, корп. 9; Минск</p></bio><bio xml:lang="en"><p>220053; 66, build. 9, Orlovskaya st.; Minsk</p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Государственное учреждение Республиканский научно-практический центр «Мать и дитя»</institution><country>Беларусь</country></aff><aff xml:lang="en"><institution>Republican Scientific and Practical Center «Mother and child»</institution><country>Belarus</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>19</day><month>10</month><year>2025</year></pub-date><volume>24</volume><issue>8</issue><fpage>6</fpage><lpage>13</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Гусина А.А., Калинина Е.А., Зиновик А.В., Пашук С.Н., Гусина Н.Б., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Гусина А.А., Калинина Е.А., Зиновик А.В., Пашук С.Н., Гусина Н.Б.</copyright-holder><copyright-holder xml:lang="en">Gusina A.A., Kalinina E.A., Zinovik A.V., Pashuk S.N., Gusina N.B.</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.medgen-journal.ru/jour/article/view/3109">https://www.medgen-journal.ru/jour/article/view/3109</self-uri><abstract><p>   Сиалурия – чрезвычайно редкое заболевание с аутосомно-доминантным наследованием из группы врожденных нарушений обмена сиаловых кислот. Наиболее характерными клиническими проявлениями сиалурии являются задержка развития, грубоватые черты лица и массивная экскреция свободной сиаловой (N-ацетилнейраминовой) кислоты. Причиной заболевания являются патогенные миссенс варианты в гене GNE, которые приводят к заменам остатков аминокислот эпимеразного домена фермента УДФ-N-ацетилглюкозамин-2-эпимеразы/N-ацетилманнозамин-киназы, что сопровождается нарушением ингибирования активности энзима по механизму отрицательной обратной связи и чрезмерным синтезом сиаловой кислоты. В этой работе представлены новый случай сиалурии, обусловленный патогенным вариантом NM_005476.7 (GNE): c.797G&gt;A, p.Arg266Gln, rs121908622, и первый опыт количественного определения N-ацетилнейраминой кислоты в высушенных образцах капиллярной крови методом тандемной масс-спектрометрии для диагностики этого заболевания.</p></abstract><trans-abstract xml:lang="en"><p>   Sialuria is an extremely rare disease with autosomal dominant inheritance from the group of inborn disorder of sialic acid metabolism. The most characteristic clinical manifestations of sialuria are mildly coarse facial features, moderate develomental retardation and massive urinary excretion of free sialic (N-acetylneuraminic) acid. The cause of the disease are pathogenic missense variants in GNE gene resulted in failed feedback inhibition of uridinediphosphate-N-acetylglucosamine (UDP-GlcNAc) 2-epimerase with overproduction of sialic acid. This study presents a new case of sialuria caused by the pathogenic variant NM_005476.7 (GNE): c.797G&gt;A, p.Arg266Gln, rs121908622 and the first experience of quantitative determination of N-acetylneuraminic acid in dried capillary blood samples by tandem mass spectrometry for the diagnosis of this disease.</p></trans-abstract><kwd-group xml:lang="en"><kwd>sialuria</kwd><kwd>GNE</kwd><kwd>sialic acids</kwd><kwd>tandem mass spectrometry</kwd><kwd>glycosylation</kwd><kwd>arylsulfatase A</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследование выполнено без спонсорской поддержки</funding-statement><funding-statement xml:lang="en">The study was not supported by sponsorship</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Wedekind H., Kats E., Weiss A.C. et al. 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