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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">sredob</journal-id><journal-title-group><journal-title xml:lang="ru">Здоровье населения и среда обитания – ЗНиСО</journal-title><trans-title-group xml:lang="en"><trans-title>Public Health and Life Environment – PH&amp;LE</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2219-5238</issn><issn pub-type="epub">2619-0788</issn><publisher><publisher-name>ФБУЗ ФЦГиЭ Роспотребнадзора</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.35627/2219-5238/2023-31-11-94-100</article-id><article-id custom-type="elpub" pub-id-type="custom">sredob-1822</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>ЭПИДЕМИОЛОГИЯ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>EPIDEMIOLOGY</subject></subj-group></article-categories><title-group><article-title>Анализ антифаговых систем в штаммах Vibrio cholerae O1 биовара Эль Тор</article-title><trans-title-group xml:lang="en"><trans-title>Analysis of Antiphage Systems in Vibrio cholerae O1 El Tor Biotype Strains</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-4366-0562</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Заднова</surname><given-names>С. П.</given-names></name><name name-style="western" xml:lang="en"><surname>Zadnova</surname><given-names>S. P.</given-names></name></name-alternatives><bio xml:lang="ru"><p>дения об авторах:Заднова Светлана Петровна – д.б.н., ведущий научный сотрудник лаборатории патогенных вибрионов</p><p>ул. Университетская, д. 46, г. Саратов, 410005</p></bio><bio xml:lang="en"><p>Svetlana P. Zadnova, Dr. Sci. (Biol.), Leading Researcher, Head of the Laboratory of Pathogenic Vibrios</p><p>46 Universitetskaya Street, Saratov, 410005</p></bio><email xlink:type="simple">svetlanazadnova@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/0000-0002-2355-7018</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Плеханов</surname><given-names>Н. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Plekhanov</surname><given-names>N. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Плеханов Никита Александрович – к.б.н., старший научный сотрудник лаборатории патогенных вибрионов</p><p>ул. Университетская, д. 46, г. Саратов, 410005</p></bio><bio xml:lang="en"><p>Nikita A. Plekhanov, Cand. Sci. (Biol.), Senior Researcher, Laboratory of Pathogenic Vibrios</p><p>46 Universitetskaya Street, Saratov, 410005</p></bio><email xlink:type="simple">muscari.sp@icloud.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-9779-166X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Спирина</surname><given-names>А. Ю.</given-names></name><name name-style="western" xml:lang="en"><surname>Spirina</surname><given-names>A. Yu.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Спирина Алина Юрьевна – младший научный сотрудник лаборатории патогенных вибрионов</p><p>ул. Университетская, д. 46, г. Саратов, 410005</p></bio><bio xml:lang="en"><p>Alina Yu. Spirina, Junior Researcher, Laboratory of Pathogenic Vibrios</p><p>46 Universitetskaya Street, Saratov, 410005</p></bio><email xlink:type="simple">rusrapi@microbe.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/0000-0001-5759-3765</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Челдышова</surname><given-names>Н. Б.</given-names></name><name name-style="western" xml:lang="en"><surname>Cheldyshova</surname><given-names>N. B.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Челдышова Надежда Борисовна – к.м.н., старший научный сотрудник лаборатории патогенных вибрионов</p><p>ул. Университетская, д. 46, г. Саратов, 410005</p></bio><bio xml:lang="en"><p>Nadezhda B. Cheldyshova, Cand. Sci. (Med.), Senior Researcher, Laboratory of Pathogenic Vibrios</p><p>46 Universitetskaya Street, Saratov, 410005</p></bio><email xlink:type="simple">rusrapi@microbe.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>ФКУН «Российский научно-исследовательский противочумный институт “Микроб”» Роспотребнадзора</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Russian Research Anti-Plague Institute “Microbe”</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>12</day><month>12</month><year>2023</year></pub-date><volume>31</volume><issue>11</issue><fpage>94</fpage><lpage>100</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Заднова С.П., Плеханов Н.А., Спирина А.Ю., Челдышова Н.Б., 2023</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="ru">Заднова С.П., Плеханов Н.А., Спирина А.Ю., Челдышова Н.Б.</copyright-holder><copyright-holder xml:lang="en">Zadnova S.P., Plekhanov N.A., Spirina A.Y., Cheldyshova N.B.</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://zniso.fcgie.ru/jour/article/view/1822">https://zniso.fcgie.ru/jour/article/view/1822</self-uri><abstract><sec><title>Введение</title><p>Введение. Холерные литические фаги способствуют генетическому разнообразию и эволюции Vibrio cholerae. Для защиты от фагов патоген приобрел различные механизмы устойчивости.</p></sec><sec><title>Цель исследования</title><p>Цель исследования: выявление антифаговых систем, расположенных на мобильных генетических элементах, в штаммах V. cholerae О1 серогруппы биовара Эль Тор.</p></sec><sec><title>Материалы и методы</title><p>Материалы и методы. Использовали нуклеотидные последовательности полных геномов 77 токсигенных штаммов V. cholerae О1 биовара Эль Тор, завезенных с 1970 по 2014 г. на территорию РФ и сопредельных стран. Для анализа применяли алгоритм Blast NCBI GenBank. Филогенетический анализ проводили с использованием сервера REALPHY.</p></sec><sec><title>Результаты</title><p>Результаты. Показано, что изученные штаммы в составе 5-й «горячей точки» ICE SXT элемента содержат два типа антифаговых систем – BREX, характерную для ICE VchBan9, и BREX с abi, специфичные для ICE VchInd5. Установлена прямая связь между наличием антифагового острова PLE4 и фага каппа. Штаммы V. cholerae О1 биовара Эль Тор, содержащие PLE4, за исключением одного изолята, имеют BREX ICE VchBan9 и при филогенетическом анализе группируются в отдельный кластер. Штаммы с ICE VchInd5, лишенные PLE4 и каппа фага, также образуют отдельную группу.</p></sec><sec><title>Заключение</title><p>Заключение. Получены данные о присутствии антифаговых систем в ранее завезенных штаммах V. cholerae О1 биовара Эль Тор, что расширяет сведения об их генетической организации. Изучение структуры антифаговых генов 5-й «горячей точки» ICE SXT элемента позволяет выявлять генетические различия между близкородственными штаммами V. cholerae О1 биовара Эль Тор, а также определять тип ICE SXT элемента.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Introduction</title><p>Introduction: Cholera lytic phages contribute to the genetic diversity and evolution of Vibrio cholerae. To protect against the phages, the pathogen has acquired various resistance mechanisms.</p></sec><sec><title>Objective</title><p>Objective: To identify antiphage systems located on mobile genetic elements in V. cholerae serogroup O1 El Tor biotype strains.</p></sec><sec><title>Materials and methods</title><p>Materials and methods: Nucleotide sequences of complete genomes of 77 toxigenic V. cholerae O1 El Tor strains imported to the Russian Federation and neighboring countries in 1970–2014 were analyzed using the Blast NCBI GenBank algorithm and REALPHY online tool.</p></sec><sec><title>Results</title><p>Results: We observed that the examined strains contained two types of anti-phage systems in hotspot 5 of the ICE SXT element: BREX, common for ICE VchBan9, and BREX with Abi typical of ICE VchInd5. We established a direct relationship between the presence of the PLE4 antiphage island and the kappa phage. V. cholerae O1 El Tor strains containing PLE4, except for one isolate, have BREX ICE VchBan9 and are grouped into a separate cluster in phylogenetic analysis. Strains with ICE VchInd5 lacking PLE4 and kappa phage also form a separate group.</p></sec><sec><title>Conclusions</title><p>Conclusions: The data obtained on the presence of antiphage systems in previously imported strains of V. cholerae O1 biotype El Tor expand knowledge of their genetic organization. The study of the structure of antiphage genes of hotspot 5 of the ICE SXT element makes it possible to reveal genetic differences between closely related strains of V. cholerae O1 biotype El Tor and to determine the type of ICE SXT element.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>токсигенные штаммы V. cholerae</kwd><kwd>антифаговые системы 5-й «горячей» точки ICE SXT элемента</kwd><kwd>PLE остров</kwd><kwd>филогенетический анализ</kwd></kwd-group><kwd-group xml:lang="en"><kwd>toxigenic V. cholerae strains</kwd><kwd>anti-phage systems</kwd><kwd>hotspot 5</kwd><kwd>ICE SXT element</kwd><kwd>phage-inducible chromosomal island-like element (PLE)</kwd><kwd>phylogenetic analysis</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Bhandari M, Jennison AV, Rathnayake IU, Huygens F. Evolu- tion, distribution and genetics of atypical Vibrio cholerae – A review. 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