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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">ymj</journal-id><journal-title-group><journal-title xml:lang="ru">Якутский медицинский журнал</journal-title><trans-title-group xml:lang="en"><trans-title>Yakut Medical Journal</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1813-1905</issn><issn pub-type="epub">2312-1017</issn><publisher><publisher-name>ЯНЦ КМП</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.25789/YMJ.2026.94.27</article-id><article-id custom-type="elpub" pub-id-type="custom">ymj-3322</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>ТОЧКА ЗРЕНИЯ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>POINT OF VIEW</subject></subj-group></article-categories><title-group><article-title>Содержание гомоцистеина, витамина В12 и фолиевой кислоты у пациентов с неврологическими заболеваниями на Крайнем Севере (пилотное исследование)</article-title><trans-title-group xml:lang="en"><trans-title>The content of homocysteine, vitamin B12 and folic acid in patients with neurological diseases in the Far North (a pilot study)</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-2381-7895</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Олесова</surname><given-names>Л. Д.</given-names></name><name name-style="western" xml:lang="en"><surname>Olesova</surname><given-names>L. D.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Олесова Любовь Дыгыновна – канд. биол. наук, вед. науч. сотр., руководитель лаб.</p><p>ул. Кирова, д. 7, Якутск, 677018</p></bio><email xlink:type="simple">oles59@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/0000-0001-9525-1512</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Давыдова</surname><given-names>Т. К.</given-names></name><name name-style="western" xml:lang="en"><surname>Davydova</surname><given-names>T. K.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Давыдова Татьяна Кимовна ‒ канд. мед. наук, вед. науч. сотр., руководитель Центра нейродегенеративных заболеваний.</p><p>ул. Кирова, д. 7, Якутск, 677018</p></bio><email xlink:type="simple">tanya.davydova.56@inbox.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/0000-0002-5225-5940</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Ефремова</surname><given-names>С. Д.</given-names></name><name name-style="western" xml:lang="en"><surname>Efremova</surname><given-names>S. D.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ефремова Светлана Дмитриевна ‒ науч. сотр.</p><p>ул. Кирова, д. 7, Якутск, 677018</p></bio><email xlink:type="simple">esd64@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff xml:lang="ru" id="aff-1"><institution>ФГБНУ «Якутский научный центр комплексных медицинских проблем»</institution><country>Russian Federation</country></aff><pub-date pub-type="collection"><year>2026</year></pub-date><pub-date pub-type="epub"><day>21</day><month>06</month><year>2026</year></pub-date><volume>0</volume><issue>2</issue><fpage>123</fpage><lpage>127</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Олесова Л.Д., Давыдова Т.К., Ефремова С.Д., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Олесова Л.Д., Давыдова Т.К., Ефремова С.Д.</copyright-holder><copyright-holder xml:lang="en">Olesova L.D., Davydova T.K., Efremova S.D.</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://ymj.elpub.ru/jour/article/view/3322">https://ymj.elpub.ru/jour/article/view/3322</self-uri><abstract><p>Статья посвящена анализу особенностей содержания гомоцистеина, фолиевой кислоты (В9), витамина В12 в сыворотке крови у пациентов (n=105) с неврологическими заболеваниями в Республике Саха (Якутия). Исследование подтвердило взаимосвязь содержания гомоцистеина с уровнем витаминов B12 (-0,416; p &lt;0,01) и фолиевой кислоты (B9) (r= -0,416; p &lt;0,01). У женщин наблюдается тенденция к снижению уровня витамина B12, фолиевой кислоты (p &lt;0,005) в зависимости от возраста и одновременному повышению концентрации гомоцистеина (p &lt;0,001). Наибольшая доля случаев гипергомоцистеинемии приходится на женщин с НДЗ в возрасте 75 лет и старше. Учитывая, что именно в этой возрастной категории болезнь Альцгеймера чаще диагностируется у женщин, эти данные приобретают особое значение. Возрастные изменения в организме женщин характеризуются снижением уровня фолиевой кислоты в крови, тогда как у мужчин этот показатель имеет тенденцию к увеличению. Эти возрастные изменения в метаболизме гомоцистеина и фолиевой кислоты у женщин необходимо учитывать при интерпретации результатов исследований.</p></abstract><trans-abstract xml:lang="en"><p>This article analyzes the serum homocysteine, folate (B9), and vitamin B12 levels in patients (n=105) with neurological diseases in the Sakha Republic (Yakutia). The study confirmed a relationship between homocysteine levels and vitamin B12 (-0.416; p &lt;0.01) and folate (B9) (r= -0.416; p &lt;0.01) levels. Women showed a tendency toward decreased vitamin B12 and folate levels (p &lt;0.005) depending on age, and a simultaneous increase in homocysteine concentrations (p &lt;0.001). The highest proportion of hyperhomocysteinemia cases occurred in women with neurological diseases aged 75 years and older. Given that Alzheimer's disease is most often diagnosed in women in this age group, these data are of particular significance.</p><p>Age-related changes in women's bodies are characterized by decreased blood folate levels, while in men this level tends to increase. These age-related changes in homocysteine and folate metabolism in women must be taken into account when interpreting research results.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>гомоцистеин</kwd><kwd>витамин В12</kwd><kwd>фолиевая кислота</kwd><kwd>нейродегенерация</kwd><kwd>Крайний Север</kwd><kwd>гипергомоцистеинемия</kwd><kwd>болезнь Альцгеймера</kwd></kwd-group><kwd-group xml:lang="en"><kwd>homocysteine</kwd><kwd>vitamin B12</kwd><kwd>folic acid</kwd><kwd>neurodegeneration</kwd><kwd>Far North</kwd><kwd>hyperhomocysteinemia</kwd><kwd>Alzheimer’s disease</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследование проводилось в рамках НИР по Государственному заданию ЯНЦ КМП «Психофизиологические и морфогенетические особенности формирования социально-значимых заболеваний у населения Северо-Востока России» (FGWU-2025-0001).</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">Султанова О.Э., Чернышева Е.Н., Коханов А.В., Севостьянова И.В. 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