<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE article PUBLIC "-//NLM//DTD JATS (Z39.96) Journal Publishing DTD v1.3 20210610//EN" "JATS-journalpublishing1-3.dtd">
<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">10.25557/2073-7998.2025.07.107-108</article-id><article-id custom-type="elpub" pub-id-type="custom">medgen-3094</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>КРАТКИЕ СООБЩЕНИЯ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>BRIEF REPORT</subject></subj-group></article-categories><title-group><article-title>Роль химерных транскриптов LINE-1 в плаценте человека первого триместра беременности</article-title><trans-title-group xml:lang="en"><trans-title>The role of chimeric LINE-1 transcripts in the human placenta during the first trimester of pregnancy</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>Толмачева</surname><given-names>Е. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Tolmacheva</surname><given-names>E. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Толмачева Екатерина Николаевна,</p><p>634050, г. Томск, ул. Набережная реки Ушайки, д. 10</p></bio><bio xml:lang="en"><p>10, Nab. Ushaiki, Tomsk, 634050</p></bio><email xlink:type="simple">kate.tolmacheva@medgenetics.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>Жилкина</surname><given-names>М. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Zhilkina</surname><given-names>M. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>634050, г. Томск, ул. Набережная реки Ушайки, д. 10</p></bio><bio xml:lang="en"><p>10, Nab. Ushaiki, Tomsk, 634050</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>Лушников</surname><given-names>И. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Lushnikov</surname><given-names>I. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>634050, г. Томск, ул. Набережная реки Ушайки, д. 10</p></bio><bio xml:lang="en"><p>10, Nab. Ushaiki, Tomsk, 634050</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>Васильев</surname><given-names>С. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Vasilyev</surname><given-names>S. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>634050, г. Томск, ул. Набережная реки Ушайки, д. 10</p></bio><bio xml:lang="en"><p>10, Nab. Ushaiki, Tomsk, 634050</p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Томский национальный исследовательский медицинский центр Российской академии наук,&#13;
Научно-исследовательский институт медицинской генетики</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Research Institute of Medical Genetics, Tomsk National Research Medical Center of the Russian Academy of Sciences</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>29</day><month>09</month><year>2025</year></pub-date><volume>24</volume><issue>7</issue><fpage>107</fpage><lpage>108</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Толмачева Е.Н., Жилкина М.А., Лушников И.В., Васильев С.А., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Толмачева Е.Н., Жилкина М.А., Лушников И.В., Васильев С.А.</copyright-holder><copyright-holder xml:lang="en">Tolmacheva E.N., Zhilkina M.A., Lushnikov I.V., Vasilyev S.A.</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/3094">https://www.medgen-journal.ru/jour/article/view/3094</self-uri><abstract><p>Ретротранспозон LINE-1 широко представлен в геноме человека и может выполнять функцию альтернативного промотора в генах. Активность LINE-1 регулируется метилированием ДНК. Ранее мы показали, что LINE-1 гипометилирован в нормальной плаценте и гиперметилирован в ворсинах хориона у спонтанных абортусов. Аномалии метилирования мобильного элемента могут влиять на экспрессию химерных транскриптов LINE-1. В этом исследовании мы впервые идентифицировали гены, экспрессирующиеся с альтернативного промотора LINE-1 в плаценте человека первого триместра беременности. Химерные транскрипты этих генов участвуют в процессах плацентарного развития, а дефицит их экспрессии потенциально может приводить к нарушениям в функционировании плаценты и эмбриолетальности.</p></abstract><trans-abstract xml:lang="en"><p>LINE-1 retrotransposon is widely represented in the human genome and can function as an alternative promoter in genes. The activity of LINE-1 is regulated by DNA methylation. Previously, we showed that LINE-1 is hypomethylated in normal placenta and hypermethylated in chorionic villi of spontaneous abortions. Abnormalities in the methylation of mobile elements may affect the expression of chimeric LINE-1 transcripts. In this study, for the first time, we identified genes expressed from the alternative LINE-1 promoter in the human placenta during the first trimester of pregnancy. Chimeric transcripts of these genes are involved in placental development processes, and a deficiency in their expression could potentially lead to placental dysfunction and embryolethality.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>альтернативный промотор LINE-1</kwd><kwd>химерные транскрипты</kwd><kwd>плацента</kwd></kwd-group><kwd-group xml:lang="en"><kwd>alternative LINE-1 promoter</kwd><kwd>chimeric transcripts</kwd><kwd>placenta</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена при финансовой поддержке гранта РНФ № 24-25-00335.</funding-statement><funding-statement xml:lang="en">This work was supported by grant No. 24-25-00335 from the Russian Science Foundation.</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">Vasilyev S.A.,, Tolmacheva E. N, Vasilyeva O.Yu , et al. LINE-1 retrotransposon methylation in chorionic villi of first trimester miscarriages with aneuploidy. J Assist Reprod Genet. 2020; 38(1): 139–149. DOI: 10.1007/s10815-020-02003-1.</mixed-citation><mixed-citation xml:lang="en">Vasilyev S.A.,, Tolmacheva E. N, Vasilyeva O.Yu , et al. LINE-1 retrotransposon methylation in chorionic villi of first trimester miscarriages with aneuploidy. J Assist Reprod Genet. 2020; 38(1): 139–149. DOI: 10.1007/s10815-020-02003-1.</mixed-citation></citation-alternatives></ref></ref-list><fn-group><fn fn-type="conflict"><p>The authors declare that there are no conflicts of interest present.</p></fn></fn-group></back></article>
