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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">Russian Journal of Infection and Immunity</journal-id><journal-title-group><journal-title xml:lang="en">Russian Journal of Infection and Immunity</journal-title><trans-title-group xml:lang="ru"><trans-title>Инфекция и иммунитет</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2220-7619</issn><issn publication-format="electronic">2313-7398</issn><publisher><publisher-name xml:lang="en">SPb RAACI</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">17783</article-id><article-id pub-id-type="doi">10.15789/2220-7619-HOV-17783</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>ORIGINAL ARTICLES</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>ОРИГИНАЛЬНЫЕ СТАТЬИ</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">Heterogeneity of virulence factors among <italic>Porphyromonas gingivalis</italic> clinical isolates from patients with chronic generalized periodontitis</article-title><trans-title-group xml:lang="ru"><trans-title>Гетерогенность факторов вирулентности среди клинических изолятов <italic>Porphyromonas gingivalis</italic>, выделенных от пациентов c хроническим генерализованным пародонтитом</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Koroleva</surname><given-names>I. V.</given-names></name><name xml:lang="ru"><surname>Королева</surname><given-names>И. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>PhD (Biology), Associate Professor, Department of Fundamental Problems of Medicine and Medical Technologies; Senior Researcher, Department of Molecular Microbiology</p></bio><bio xml:lang="ru"><p>к.б.н., доцент кафедры фундаментальных проблем медицины и медицинских технологий Медицинского института; старший научный сотрудник Отдела молекулярной микробиологии</p></bio><email>e.michailova@spbu.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Mikhailova</surname><given-names>Ekaterina S.</given-names></name><name xml:lang="ru"><surname>Михайлова</surname><given-names>Екатерина Станиславовна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>DSc (Medicine), Associate Professor, Associate Professor of the Department of Therapeutic Dentistry</p></bio><bio xml:lang="ru"><p>д.м.н., доцент, доцент кафедры терапевтической стоматологии Медицинского института</p></bio><email>e.michailova@spbu.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Privalova</surname><given-names>K. A.</given-names></name><name xml:lang="ru"><surname>Привалова</surname><given-names>К. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Resident of the Department of Oral and Maxillofacial Surgery and Surgical Dentistry</p></bio><bio xml:lang="ru"><p>ординатор кафедры челюстно-лицевой хирургии и хирургической стоматологии</p></bio><email>e.michailova@spbu.ru</email><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Ermolaeva</surname><given-names>L. A.</given-names></name><name xml:lang="ru"><surname>Ермолаева</surname><given-names>Л. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>DSc (Medicine), Professor, Head of the Therapeutic Dentistry Department</p></bio><bio xml:lang="ru"><p>д.м.н., профессор, зав. кафедрой терапевтической стоматологии Медицинского института</p></bio><email>e.michailova@spbu.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Tumanova</surname><given-names>S. A.</given-names></name><name xml:lang="ru"><surname>Туманова</surname><given-names>С. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>PhD (Medicine), Associate Professor, Associate Professor of the Department of Therapeutic Dentistry</p></bio><bio xml:lang="ru"><p>к.м.н., доцент, доцент кафедры терапевтической стоматологии Медицинского института</p></bio><email>e.michailova@spbu.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Suvorov</surname><given-names>A. N.</given-names></name><name xml:lang="ru"><surname>Суворов</surname><given-names>А. Н.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>RAS Corresponding Member, DSc (Medicine), Professor, Head of the Fundamental Problems of Medicine and Medical Technologies Department; Head of the Molecular Microbiology Department</p></bio><bio xml:lang="ru"><p>член-корреспондент РАН, д.м.н., профессор, зав. кафедрой фундаментальных проблем медицины и медицинских технологий Медицинского института; зав. отделом молекулярной микробиологии</p></bio><email>e.michailova@spbu.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">St. Petersburg State University</institution></aff><aff><institution xml:lang="ru">ФГБОУ ВО Санкт-Петербургский государственный университет</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Institute of Experimental Medicine</institution></aff><aff><institution xml:lang="ru">ФГБНУ Институт экспериментальной медицины</institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">Pavlov First St. Petersburg State Medical University</institution></aff><aff><institution xml:lang="ru">ФГБОУ ВО Первый Санкт-Петербургский государственный медицинский университет имени академика И.П. Павлова МЗ РФ</institution></aff></aff-alternatives><pub-date date-type="preprint" iso-8601-date="2024-10-24" publication-format="electronic"><day>24</day><month>10</month><year>2024</year></pub-date><pub-date date-type="pub" iso-8601-date="2024-12-25" publication-format="electronic"><day>25</day><month>12</month><year>2024</year></pub-date><volume>14</volume><issue>6</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>1079</fpage><lpage>1086</lpage><history><date date-type="received" iso-8601-date="2024-09-26"><day>26</day><month>09</month><year>2024</year></date><date date-type="accepted" iso-8601-date="2024-10-23"><day>23</day><month>10</month><year>2024</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2024, Koroleva I.V., Mikhailova E.S., Privalova K.A., Ermolaeva L.A., Tumanova S.A., Suvorov A.N.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2024, Королева И.В., Михайлова Е.С., Привалова К.А., Ермолаева Л.А., Туманова С.А., Суворов А.Н.</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="en">Koroleva I.V., Mikhailova E.S., Privalova K.A., Ermolaeva L.A., Tumanova S.A., Suvorov A.N.</copyright-holder><copyright-holder xml:lang="ru">Королева И.В., Михайлова Е.С., Привалова К.А., Ермолаева Л.А., Туманова С.А., Суворов А.Н.</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://iimmun.ru/iimm/article/view/17783">https://iimmun.ru/iimm/article/view/17783</self-uri><abstract xml:lang="en"><p>The development of chronic generalized periodontitis occurs due to a combination of a several causes, among which the leading role is assigned to periodontal pathogens, which include <italic>P. gingivalis</italic>. Among <italic>P. gingivalis</italic> virulence factors, the polysaccharide capsule, fimbria proteins, cysteine proteases, and hemagglutinins are of special importance. The study was aimed to investigate the prevalence of specific virulence genes and identify a virulent genotype among <italic>P. gingivalis</italic> isolates found in patients with severe chronic generalized periodontitis (CGP). 41 patients (27 women and 14 men, average age 43.9±1.5 years) were examined, of which main and control group consisted of 22 patients with severe CGP and 19 patients without inflammatory periodontal diseases, respectively. The PCR data allow to consider type II fimbria (FimA II), arginine-dependent type A protease (RghA) and lysine-dependent protease (Kgh) as specific markers for the detection of more virulent <italic>P. gingivalis</italic> strains. It was found that in St. Petersburg, the following <italic>P. gingivalis</italic> genotypes predominate among patients with severe CGP: <italic>fimA</italic> II:<italic>kg</italic>:<italic>rghA</italic>, <italic>fimA</italic> II:<italic>kgh</italic> and <italic>fimA</italic> II:<italic>rghA</italic>. In addition, it has been demonstrated that virulent genotypes are detected to a small extent in <italic>P. gingivalis</italic> isolates from healthy control group patients. The identification of <italic>P. gingivalis</italic> strains with a more prominent pathogenic potential and the detection of their virulent genotypes is of great practical importance, in the future allowing to develop advanced effective methods for disease prevention to be used in a personalized medicine strategy. The results obtained are also of high importance due to the recorded variability in the circulation of <italic>P. gingivalis</italic> strain genotypes in various worldwide regions.</p></abstract><trans-abstract xml:lang="ru"><p>Развитие хронического генерализованного пародонтита обусловлено сочетанием целого ряда причин, среди которых ведущая роль отводится пародонтопатогенам, к которым относится <italic>P. gingivalis</italic>. Среди факторов вирулентности <italic>P. gingivalis</italic> особенно выделяют полисахаридную капсулу, белки фимбрий, цистеиновые протеазы, гемагглютинины. Цель исследования — изучение распространенности специфических генов вирулентности и определение вирулентного генотипа среди изолятов <italic>P. gingivalis</italic>, выявляемых у пациентов с хроническим генерализованным пародонтитом тяжелой степени (ХГП ТС). Было проведено обследование 41 пациента (27 женщин и 14 мужчин, средний возраст 43,9±1,5 лет), из которых основную группу составили 22 пациента с ХГП ТС и контрольную группу составили 19 пациентов без воспалительных заболеваний пародонта. Результаты, полученные с использованием ПЦР, позволяют рассматривать фимбрии II типа (FimA II), аргинин-зависимую протеазу А типа (RghA) и лизин-зависимую протеазу (Kgh) в качестве специфических маркеров для обнаружения более патогенных штаммов <italic>P. gingivalis</italic>. Установлено, что в Санкт-Петербурге среди пациентов с ХГП ТС преобладают следующие генотипы <italic>P. gingivalis</italic>: <italic>fimA</italic> II:<italic>kgh</italic>:<italic>rghA</italic>, <italic>fimA</italic> II:<italic>kgh</italic> и <italic>fimA</italic> II: <italic>rghA</italic>. Кроме того, было продемонстрировано, что вирулентные генотипы выявляются в незначительной степени в изолятах <italic>P. gingivalis</italic> от здоровых пациентов контрольной группы. Идентификация штаммов <italic>P. gingivalis</italic> с более выраженным патогенным потенциалом и обнаружение их вирулентных генотипов имеет важное практическое значение, позволяя в будущем разработать современные эффективные методы профилактики заболевания и использовать их в стратегии персонализированной медицины. Полученные результаты также представляют высокую значимость в связи зарегистрированной вариабельностью циркуляции генотипов штаммов <italic>P. gingivalis</italic> в различных регионах мира.</p></trans-abstract><kwd-group xml:lang="en"><kwd>chronic generalized periodontitis</kwd><kwd>heterogeneity</kwd><kwd>virulent genotype</kwd><kwd>P. gingivalis</kwd><kwd>fimbriae</kwd><kwd>cysteine proteases</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>хронический генерализованный пародонтит</kwd><kwd>гетерогенность</kwd><kwd>вирулентный генотип</kwd><kwd>P. gingivalis</kwd><kwd>фимбрии</kwd><kwd>цистеиновые протеазы</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Фукс Е.И., Карева Ю.А., Гализина О.А., Таболина Е.С. Современные аспекты этиологии и патогенеза заболеваний пародонта // Российский медико-биологический вестник им. академика И.П. Павлова. 2013. № 3. С. 153–159. 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