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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">17859</article-id><article-id pub-id-type="doi">10.15789/2220-7619-BPA-17859</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">Biological properties and pathogenetic potential of <italic>Weeksellaceae</italic> family bacteria</article-title><trans-title-group xml:lang="ru"><trans-title>Биологические свойства и патогенетический потенциал бактерий семейства <italic>Weeksellaceae</italic></trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Zubova</surname><given-names>Ksenia V.</given-names></name><name xml:lang="ru"><surname>Зубова</surname><given-names>Ксения Валерьевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Assistant Professor, Department of Microbiology and Plant Physiology</p></bio><bio xml:lang="ru"><p>ассистент кафедры микробиологии и физиологии растений биологического факультета</p></bio><email>zubovaksushechka@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kuznetsova</surname><given-names>Victoria A.</given-names></name><name xml:lang="ru"><surname>Кузнецова</surname><given-names>Виктория Александровна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Specialist of the Laboratory for the Collection and Storage of Biomaterials</p></bio><bio xml:lang="ru"><p>специалист лаборатории по сбору и хранению биоматериалов</p></bio><email>kuznecovaviktoria803@yandex.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kanevsky</surname><given-names>Matvey V.</given-names></name><name xml:lang="ru"><surname>Каневский</surname><given-names>Матвей Владимирович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>PhD (Biology), Associate Professor of the Department of Biochemistry and Biophysics, Head of the Educational and Scientific Laboratory of Molecular Biology</p></bio><bio xml:lang="ru"><p>к.б.н., доцент кафедры биохимии и биофизики, зав. учебно-научной лабораторией молекулярной биологии</p></bio><email>matvejkanev@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kondratenko</surname><given-names>Olga V.</given-names></name><name xml:lang="ru"><surname>Кондратенко</surname><given-names>Ольга Владимировна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>DSc (Medicine), Associate Professor, Acting Head of the Department of Medical Microbiology and Immunology</p></bio><bio xml:lang="ru"><p>д.м.н., доцент, и.о. зав. кафедрой медицинской микробиологии и иммунологии</p></bio><email>helga1983@yandex.ru</email><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Glinskaya</surname><given-names>Elena V.</given-names></name><name xml:lang="ru"><surname>Глинская</surname><given-names>Елена Владимировна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>PhD (Biology), Associate Professor, Department of Microbiology and Plant Physiology, Biological Faculty</p></bio><bio xml:lang="ru"><p>к.б.н., доцент, доцент кафедры микробиологии и физиологии растений биологического факультета</p></bio><email>elenavg-2007@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Nechaeva</surname><given-names>Olga V.</given-names></name><name xml:lang="ru"><surname>Нечаева</surname><given-names>Ольга Викторовна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>DSc (Biology), Associate Professor, Leading Researcher, Laboratory of Molecular Microbiology, Department of Molecular Microbiology and Bioinformatics, Institute of Microbiology, Antimicrobial Therapy and Epidemiology, Professor of the Department of Medical Microbiology named after Academician Z.V. Ermolyeva</p></bio><bio xml:lang="ru"><p>д.б.н., доцент, ведущий научный сотрудник лаборатории молекулярной микробиологии отдела молекулярной микробиологии и биоинформатики Института микробиологии, антимикробной терапии и эпидемиологии, профессор кафедры медицинской микробиологии им. акад. З.В. Ермольевой</p></bio><email>olgav.nechaeva@rambler.ru</email><xref ref-type="aff" rid="aff2"/><xref ref-type="aff" rid="aff4"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Afinogenova</surname><given-names>Anna G.</given-names></name><name xml:lang="ru"><surname>Афиногенова</surname><given-names>Анна Геннадьевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>DSc (Biology), Leading Researcher, Head of Laboratory Testing Centre</p></bio><bio xml:lang="ru"><p>д.б.н., ведущий научный сотрудник, руководитель испытательного лабораторного центра</p></bio><email>spbtestcenter@mail.ru</email><xref ref-type="aff" rid="aff5"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Saratov State University</institution></aff><aff><institution xml:lang="ru">ФГБОУ ВО Саратовский национальный исследовательский государственный университет им. Н.Г. Чернышевского Минобрнауки РФ</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">National Medical Research Center for Obstetrics, Gynecology and Perinatology named after Academician V.I.Kulakov</institution></aff><aff><institution xml:lang="ru">ФГБУ НМИЦ акушерства, гинекологии и перинатологии имени академика В.И. Кулакова Минздрава России</institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">Samara State Medical University of Ministry of Healthсare of Russian Federation</institution></aff><aff><institution xml:lang="ru">ФГБОУ ВО Самарский государственный медицинский университет Минздрава России</institution></aff></aff-alternatives><aff-alternatives id="aff4"><aff><institution xml:lang="en">Russian Medical Academy of Continuous Professional Education</institution></aff><aff><institution xml:lang="ru">ФГБОУ ДПО Российская медицинская академия непрерывного профессионального образования МЗ РФ</institution></aff></aff-alternatives><aff-alternatives id="aff5"><aff><institution xml:lang="en">St. Petersburg Pasteur Institute</institution></aff><aff><institution xml:lang="ru">ФБУН НИИ эпидемиологии и микробиологии имени Пастера</institution></aff></aff-alternatives><pub-date date-type="preprint" iso-8601-date="2025-06-09" publication-format="electronic"><day>09</day><month>06</month><year>2025</year></pub-date><pub-date date-type="pub" iso-8601-date="2025-09-15" publication-format="electronic"><day>15</day><month>09</month><year>2025</year></pub-date><volume>15</volume><issue>3</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>505</fpage><lpage>516</lpage><history><date date-type="received" iso-8601-date="2025-02-04"><day>04</day><month>02</month><year>2025</year></date><date date-type="accepted" iso-8601-date="2025-05-18"><day>18</day><month>05</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Zubova K.V., Kuznetsova V.A., Kanevsky M.V., Kondratenko O.V., Glinskaya E.V., Nechaeva O.V., Afinogenova A.G.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Зубова К.В., Кузнецова В.А., Каневский М.В., Кондратенко О.В., Глинская Е.В., Нечаева О.В., Афиногенова А.Г.</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Zubova K.V., Kuznetsova V.A., Kanevsky M.V., Kondratenko O.V., Glinskaya E.V., Nechaeva O.V., Afinogenova A.G.</copyright-holder><copyright-holder xml:lang="ru">Зубова К.В., Кузнецова В.А., Каневский М.В., Кондратенко О.В., Глинская Е.В., Нечаева О.В., Афиногенова А.Г.</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/17859">https://iimmun.ru/iimm/article/view/17859</self-uri><abstract xml:lang="en"><p>In recent years, the role of former saprophyte bacteria in the etiology of human infectious diseases has become an increasingly pressing issue. Of particular interest are non-fermenting gram-negative bacteria, many of which are members of the rhizobiome in some plants, soil and water microbiome. Increasingly, scientific literature covers cases of infections caused by members of the order Flavobacteriales, namely the genus Chryseobacterium, Elizabethkingia and Empedobacter of the Weeksellaceae family. Microorganisms of the latter are causative agents in several human diseases, including urinary tract and respiratory tract infections. The aim of our study was to investigate the biological properties of bacteria of the genus Chryseobacterium, Elizabethkingia and Empedobacter of the Weeksellaceae family isolated from patients with cystic fibrosis and to assess their pathogenetic potential. To analyze the biological properties and pathogenetic potential, 32 clinical strains of bacteria belonging to the Weeksellaceae family, isolated from biological material samples of the respiratory tract from cystic fibrosis patients, were selected for the study. Differential diagnostic media and plate test systems were used. DNA was isolated using 5X ScreenMix (ZAO Evrogen) and PCR with gel electrophoresis was performed. Bacteria of the Weeksellaceae family are characterized by a wide range of enzymes, especially C. arthrosphaerae and E. meningoseptica. It was found that strains of the Chryseobacterium, Elizabethkingia and Empedobacter genus are carriers of virulence genes, exhibit pathogenicity and participate in chronic respiratory infections in patients with cystic fibrosis. Phenotypic methods for studying enzymatic activity showed that all the examined strains of bacteria of the Weeksellaceae family are characterized by gelatinase activity, and representatives of the genus Chryseobacterium spp. — also by the ability to synthesize plasma coagulase. The potential to produce other enzymes of aggression is less pronounced and was strain specific. Analysis of the genetic profile of virulence factors in the studied bacteria showed that in their genome, genes encoding the enzymes lecithinase, hyaluronidase, elastase and hemolysin were most often found, and in bacteria of the genus Chryseobacterium spp. and Empedobacter spp. — neuroaminidase, which contribute to overcoming tissue barriers, pathogen invasion and spread throughout host tissues. The obtained results and scientific literature data indicate a special clinical role for bacteria of the Weeksellaceae family, which determines the importance of a deep study of the biological properties and virulence factors in members of the genus Chryseobacterium spp., Elizabethkingia spp. and Empedobacter spp.</p></abstract><trans-abstract xml:lang="ru"><p>В последние годы вопрос о роли бактерий, ранее являвшихся сапрофитами, в этиологии инфекционных заболеваний человека стоит крайне остро. Особый интерес вызывают неферментирующие грамотрицательные бактерии, многие из которых являются представителями ризобиома ряда растений, почвенного и водного микробиома. Все чаще в научной литературе освещают случаи инфекций, которые вызваны представителями порядка Flavobacteriales, а именно родов Chryseobacterium, Elizabethkingia и Empedobacter семейства Weeksellaceae. Микроорганизмы этого семейства являются возбудителями ряда заболеваний человека, в том числе инфекций мочевыводящих и дыхательных путей. Целью нашего исследования являлось изучение биологических свойств бактерий родов Chryseobacterium, Elizabethkingia и Empedobacter семейства Weeksellaceae, выделенных от пациентов с муковисцидозом, и оценка их патогенетического потенциала. Для оценки биологических свойств и патогенетического потенциала в исследование отобраны 32 клинических штамма бактерий, относящихся к семейству Weeksellaceae, выделенных из образцов биологического материала респираторного тракта пациентов с муковисцидозом. Использовали дифференциально-диагностические среды и планшетные тест-системы. ДНК выделяли с 5X ScreenMix (ЗАО «Евроген») и проводили ПЦР с гель-электрофорезом. Бактерии семейства Weeksellaceae характеризуются широким набором ферментов, особенно C. arthrosphaerae и E. meningoseptica. Установлено, что штаммы родов Chryseobacterium, Elizabethkingia, и Empedobacter являются носителями генов вирулентности, проявляют патогенность и участвуют в хронических респираторных инфекциях у больных муковисцидозом. Фенотипические методы исследования ферментативной активности показали, что все исследуемые штаммы бактерий семейства Weeksellaceae характеризуются желатиназной активностью, а представители рода Chryseobacterium spp. — еще и способностью к синтезу плазмокоагулазы. Способность к продукции других ферментов агрессии менее выражена и носила штаммовую специфичность. Анализ генетического профиля факторов вирулентности исследуемых бактерий показал, что в составе генома исследуемых штаммов чаще всего обнаруживали гены, кодирующие ферменты лецитиназу, гиалуронидазу, эластазу и гемолизин, а у бактерий родоа Chryseobacterium spp. и Empedobacter spp. — нейроаминидазу, которые способствуют преодолению тканевых барьеров, инвазии и распространению возбудителя по макроорганизму. Полученные результаты и научные литературные данные указывают на особую клиническую роль бактерий семейства Weeksellaceae, что определяет значимость глубокого изучения биологических свойств и факторов вирулентности представителей родов Chryseobacterium spp., Elizabethkingia spp. и Empedobacter spp.</p></trans-abstract><kwd-group xml:lang="en"><kwd>saprophytic bacteria</kwd><kwd>cystic fibrosis</kwd><kwd>virulence genes</kwd><kwd>enzymatic activity of bacteria</kwd><kwd>Weeksellaceae</kwd><kwd>Flavobacteriales</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>сапрофитные бактерии</kwd><kwd>муковисцидоз</kwd><kwd>гены вирулентности</kwd><kwd>ферментативная активность бактерий</kwd><kwd>Weeksellaceae</kwd><kwd>Flavobacteriales</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Боронина Л.Г., Кукушкина М.П., Крутова К.В., Блинова С.М. 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