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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">Journal of microbiology, epidemiology and immunobiology</journal-id><journal-title-group><journal-title xml:lang="en">Journal of microbiology, epidemiology and immunobiology</journal-title><trans-title-group xml:lang="ru"><trans-title>Журнал микробиологии, эпидемиологии и иммунобиологии</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0372-9311</issn><issn publication-format="electronic">2686-7613</issn><publisher><publisher-name xml:lang="en">Central Research Institute for Epidemiology</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">18474</article-id><article-id pub-id-type="doi">10.36233/0372-9311-397</article-id><article-id pub-id-type="edn">ucqwtu</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>ORIGINAL RESEARCHES</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>ОРИГИНАЛЬНЫЕ ИССЛЕДОВАНИЯ</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">Analysis of production levels of InlA and InlB invasion factors in Listeria monocytogenes isolates collected in the Russian Federation</article-title><trans-title-group xml:lang="ru"><trans-title>Анализ уровня продукции факторов инвазии InlA и InlB у изолятов Listeria monocytogenes, выделенных на территории Российской Федерации</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-4478-3225</contrib-id><name-alternatives><name xml:lang="en"><surname>Kalinin</surname><given-names>Egor V.</given-names></name><name xml:lang="ru"><surname>Калинин</surname><given-names>Егор Валерьевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>researcher, Laboratory of ecology of infectious agents, Gamaleya Research Center of Epidemiology and Microbiology</p></bio><bio xml:lang="ru"><p>н.с. лаб. экологии возбудителей инфекций НИЦЭМ им. Н.Ф. Гамалеи</p></bio><email>kalinin.egor@bk.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7901-5226</contrib-id><name-alternatives><name xml:lang="en"><surname>Chalenko</surname><given-names>Yaroslava M.</given-names></name><name xml:lang="ru"><surname>Чаленко</surname><given-names>Ярослава Михайловна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Cand. Sci. (Med.), senior researcher, Laboratory of ecology of infectious agents, Gamaleya Research Center of Epidemiology and Microbiology</p></bio><bio xml:lang="ru"><p>к.м.н., с.н.с., лаб. экологии возбудителей инфекций НИЦЭМ им. Н.Ф. Гамалеи</p></bio><email>kalinin.egor@bk.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-9051-2664</contrib-id><name-alternatives><name xml:lang="en"><surname>Safarova</surname><given-names>Polina V.</given-names></name><name xml:lang="ru"><surname>Сафарова</surname><given-names>Полина Вагифовна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Cand. Sci. (Med.), senior researcher, Laboratory of ecology of infectious agents, Gamaleya Research Center of Epidemiology and Microbiology</p></bio><bio xml:lang="ru"><p>лаборант-исследователь, лаб. экологии возбудителей инфекций НИЦЭМ им. Н.Ф. Гамалеи</p></bio><email>kalinin.egor@bk.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0000-9228-3818</contrib-id><name-alternatives><name xml:lang="en"><surname>Fedorova</surname><given-names>Victoria A.</given-names></name><name xml:lang="ru"><surname>Федорова</surname><given-names>Виктория Алексеевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>laboratory researcher, Laboratory of ecology of infectious agents, Gamaleya Research Center of Epidemiology and Microbiology</p></bio><bio xml:lang="ru"><p>лаборант-исследователь, лаб.экологии возбудителей инфекций НИЦЭМ им. Н.Ф. Гамалеи</p></bio><email>kalinin.egor@bk.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3396-6816</contrib-id><name-alternatives><name xml:lang="en"><surname>Ermolaeva</surname><given-names>Svetlana A.</given-names></name><name xml:lang="ru"><surname>Ермолаева</surname><given-names>Светлана Александровна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>D. Sci. (Biol.), Head, Laboratory of ecology of infectious agents, Gamaleya Research Center of Epidemiology and Microbiology</p></bio><bio xml:lang="ru"><p>д.б.н., зав. лаб. экологии возбудителей инфекций НИЦЭМ им. Н.Ф. Гамалеи</p></bio><email>kalinin.egor@bk.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Gamaleya Research Center of Epidemiology and Microbiology</institution></aff><aff><institution xml:lang="ru">Национальный исследовательский центр эпидемиологии и микробиологии имени Н.Ф. Гамалеи</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2023-11-22" publication-format="electronic"><day>22</day><month>11</month><year>2023</year></pub-date><volume>100</volume><issue>5</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>276</fpage><lpage>286</lpage><history><date date-type="received" iso-8601-date="2023-11-20"><day>20</day><month>11</month><year>2023</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2023, Kalinin E.V., Chalenko Y.M., Safarova P.V., Fedorova V.A., Ermolaeva S.A.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, Калинин Е.В., Чаленко Я.М., Сафарова П.В., Федорова В.А., Ермолаева С.А.</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">Kalinin E.V., Chalenko Y.M., Safarova P.V., Fedorova V.A., Ermolaeva S.A.</copyright-holder><copyright-holder xml:lang="ru">Калинин Е.В., Чаленко Я.М., Сафарова П.В., Федорова В.А., Ермолаева С.А.</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://microbiol.crie.ru/jour/article/view/18474">https://microbiol.crie.ru/jour/article/view/18474</self-uri><abstract xml:lang="en"><p><bold>Background. </bold><italic>Listeria monocytogenes</italic> is characterized by the presence of epidemic hypervirulent clones. A key feature of <italic>L. monocytogenes</italic> is its capacity to invade non-professional phagocytic cells. Hypervirulent clones are strongly associated with the increased production and/or the presence of certain isoforms of invasion factors InlA and InlB.</p> <p>The <bold>purpose</bold> of the study is to create a test system for InlA and InlB detection and to measure the InlA and InlB production levels in <italic>L. monocytogenes</italic> isolates belonging to clonal groups with different virulence potential.</p> <p><bold>Materials and methods. </bold>The study was performed using 32 <italic>L. monocytogenes</italic> strains belonging to epidemic clones ECII, ECIV, ECVII (clonal complexes CC1, CC2, CC7) and hypovirulent clonal complex CC9. Sequencing of <italic>inlA</italic> and <italic>inlB </italic>genes was performed. The indirect enzyme-linked immunosorbent assay was used to analyze the production levels of InlA and InlB proteins.</p> <p><bold>Results. </bold>The<bold> </bold>variability of InlA was revealed among strains belonging to the same clonal complex: 3 InlA isoforms were identified among strains belonging to CC7; out of 8 strains belonging to CC9, one strain had a stop codon in the <italic>inlA </italic>gene, leading to the loss of function of the InlA protein. The differences between <italic>inlB</italic> alleles correlated with the specificity of strains belonging to a certain clonal complex. Differences in production levels of invasion factors were measured. In strains belonging to CC9, the InlA production level was 2.5 times as low compared to strains belonging to CC1, CC2, and CC7. In strains belonging to phylogenetically related CC1 and CC2, the InlB production level was on average 4 times as high compared to strains belonging to CC7 and CC9.</p> <p><bold>Conclusion. </bold>The obtained results confirm the variability of major invasion factors both among clonal complexes and strains of the same complex. The increased production of invasion factors InlA and InlB correlates with the potential virulence of strains.</p></abstract><trans-abstract xml:lang="ru"><p><bold>Актуальность. </bold><italic>Listeria monocytogenes</italic> характеризуется наличием эпидемически высоковирулентных клонов. Инвазия в непрофессиональные фагоциты — ключевой момент листериозной инфекции. Формирование высоковирулентных клонов обусловлено повышенной продукцией и/или наличием определённых изоформ факторов инвазии белков InlA и InlB.</p> <p><bold>Цель </bold>исследования — создать тест-систему для обнаружения InlA и InlB и на её основе оценить уровни продукции InlA и InlB у изолятов <italic>L. monocytogenes</italic>, относящихся к клональным группам с различным вирулентным потенциалом.</p> <p><bold>Материалы и методы. </bold>В работе использованы 32 штамма <italic>L. monocytogenes</italic>, относящихся к эпидемическим клонам ECII, ECIV, ECVII (клональные комплексы СС1, СС2, СС7) и гиповирулентному клональному комплексу СС9. Проведено секвенирование генов <italic>inlA</italic> и <italic>inlB</italic>. Для анализа уровня продукции белков InlA и InlB использован непрямой иммуноферментный анализ.</p> <p><bold>Результаты. </bold>Выявлена вариабельность InlA среди штаммов, относящихся к одному клональному комплексу: в том числе среди штаммов, принадлежащих к СС7, выявлены 3 изоформы InlA; из 8 штаммов, принадлежащих к СС9, у одного выявили стоп-кодон в гене <italic>inlA</italic>, приводящий к утрате функциональности белка InlA. Различия между аллелями <italic>inlB</italic> коррелировали с принадлежностью штаммов к конкретному клональному комплексу. Установлены различия в уровне продукции факторов инвазии. У штаммов, относящихся к СС9, уровень продукции InlA был в 2,5 раза ниже по сравнению со штаммами, относящимися к СС1, СС2 и СС7. Уровень продукции InlB был в среднем в 4 раза выше у штаммов, принадлежащих к филогенетически родственным СС1 и СС2, по сравнению со штаммами, относящимися к СС7 и СС9.</p> <p><bold>Заключение. </bold>Полученные результаты свидетельствуют о вариабельности основных факторов инвазии как между клональными комплексами, так и между штаммами одного комплекса. Повышенная продукция факторов инвазии InlA и InlB коррелирует с потенциальной вирулентностью штаммов.</p></trans-abstract><kwd-group xml:lang="en"><kwd>Listeria monocytogenes</kwd><kwd>InlA</kwd><kwd>InlB</kwd><kwd>enzyme-linked immunosorbent assay</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>Listeria monocytogenes</kwd><kwd>InlA</kwd><kwd>InlB</kwd><kwd>иммуноферментный анализ</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Работа поддержана грантом РНФ</institution></institution-wrap><institution-wrap><institution xml:lang="en">This is study was supported by the Russian Science Foundation</institution></institution-wrap></funding-source><award-id>21–74–00105</award-id></award-group><funding-statement xml:lang="en">This is study was supported by the Russian Science Foundation (project number 21-74-00105).</funding-statement><funding-statement xml:lang="ru">Работа поддержана грантом РНФ № 21–74–00105.</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Pires S.M., Desta B.N., Mughini-Gras L., et al. 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