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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="other" 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">141</article-id><article-id pub-id-type="doi">10.36233/0372-9311-2017-2-45-53</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></subject></subj-group></article-categories><title-group><article-title xml:lang="en">INCLUSION OF SITE-SPECIFIC MUTATIONS INTO CONSERVATIVE SEGMENTS OF РА-GENE RESULTS IN ATTENUATION OF VIRULENT INFLUENZA VIRUS STRAIN A/WSN/33</article-title><trans-title-group xml:lang="ru"><trans-title>ВКЛЮЧЕНИЕ САЙТ-СПЕЦИФИЧЕСКИХ МУТАЦИЙ В КОНСЕРВАТИВНЫЕ УЧАСТКИ РА-ГЕНА ПРИВОДИТ К АТТЕНУАЦИИ ВИРУЛЕНТНОГО ШТАММА ВИРУСА ГРИППА A/WSN/33</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Rtischev</surname><given-names>A. A.</given-names></name><name xml:lang="ru"><surname>Ртищев</surname><given-names>А. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Mintaev</surname><given-names>R. R.</given-names></name><name xml:lang="ru"><surname>Минтаев</surname><given-names>Р. Р.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kost</surname><given-names>V. Yu.</given-names></name><name xml:lang="ru"><surname>Кост</surname><given-names>В. Ю.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Koptyaeva</surname><given-names>I. B.</given-names></name><name xml:lang="ru"><surname>Коптяева</surname><given-names>И. Б.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Akopova</surname><given-names>I. I.</given-names></name><name xml:lang="ru"><surname>Акопова</surname><given-names>И. И.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Lisovskaya</surname><given-names>K. V.</given-names></name><name xml:lang="ru"><surname>Лисовская</surname><given-names>К. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Markushin</surname><given-names>S. G.</given-names></name><name xml:lang="ru"><surname>Маркушин</surname><given-names>С. Г.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Mechnikov Research Institute of Vaccines and Sera</institution></aff><aff><institution xml:lang="ru">НИИ вакцин и сывороток им. И. И. Мечникова</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2017-04-28" publication-format="electronic"><day>28</day><month>04</month><year>2017</year></pub-date><volume>94</volume><issue>2</issue><issue-title xml:lang="ru"/><fpage>45</fpage><lpage>53</lpage><history><date date-type="received" iso-8601-date="2019-04-10"><day>10</day><month>04</month><year>2019</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2017, Rtischev A.A., Mintaev R.R., Kost V.Y., Koptyaeva I.B., Akopova I.I., Lisovskaya K.V., Markushin S.G.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2017, Ртищев А.А., Минтаев Р.Р., Кост В.Ю., Коптяева И.Б., Акопова И.И., Лисовская К.В., Маркушин С.Г.</copyright-statement><copyright-year>2017</copyright-year><copyright-holder xml:lang="en">Rtischev A.A., Mintaev R.R., Kost V.Y., Koptyaeva I.B., Akopova I.I., Lisovskaya K.V., Markushin S.G.</copyright-holder><copyright-holder xml:lang="ru">Ртищев А.А., Минтаев Р.Р., Кост В.Ю., Коптяева И.Б., Акопова И.И., Лисовская К.В., Маркушин С.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://microbiol.crie.ru/jour/article/view/141">https://microbiol.crie.ru/jour/article/view/141</self-uri><abstract xml:lang="en"><p>Aim. Study the possibility of obtaining attenuated variants of influenza virus by including specially selected site-specific mutations into a conservative sequence of PA-gene (terminal segment of COOH-domain of the PA-gene) of a virulent strain. Materials and methods. А/ WSN/33 - a virulent strain of influenza virus was used in the study. I nclusion of site-specific mutations into PA-gene of the A/WSN/33 virulent strain was carried out using a two-step mutation PCR. Cloning was carried out using GoldenGate reaction. 8-plasmid transfection system based on pHW2000 vector was used. Transformation was carried out in rubidium competent bacterial cells of DH5a strain. Transfection was done using Lipofectamine LTX (Invitrogen) reagent in a 293T and MDCK cells’ co-culture. Results. Transfectants with F658A substitution in the COOH-domain of the PA-gene were shown to acquire ts-phenotype and sharply reduce the ability to reproduce in mice lungs. Introduction of F658A substitution into COOH-domain of the PA-gene in combination with introduction of ts-mutations from ca influenza virus strains into the genome of the virulent strain resulted in obtaining transfectants that have phenotypic characteristics typical for live influenza vaccine candidates. Conclusion. The ability to obtain attenuated variants of influenza viruses by introducing specially selected site-specific mutations into conservative sequence of the PA-gene is shown.</p></abstract><trans-abstract xml:lang="ru"><p>Иель. Исследование возможности получения аттенуированных вариантов вируса гриппа с помощью включения специально подобранных сайт-специфических мутаций консервативную последовательность РА-гена (концевую часть СООН-домена РА-ена) вирулентного штамма. Материалы и методы. В работе был использован вирулентный штамм вируса гриппа A/WSN/33. Включение сайт-специфических мутаций РА-ген вирулентного штамма A/WSN/33 проводили с помощью двуступенчатой мутационной ПЦР. Клонирование осуществляют, используя GoldenGate реакцию. Использовали 8-плазмидную трансфекционную систему на основе вектора pH W2000. Трансформацию проводили на рубидиевых компетентных бактериальных клетках штамма DH5a. Трансфекцию делали при помощи реагента LipofectamineLTX(Invitro-;гп) в кокультуре клеток 293Т и MDCK. Результаты. Показано, что трансфектанты, содержащие замену F658A в СООН-домене РА-гена, приобрели ts-фенотип и резко снизили способность к размножению в легких мышей. Включение замены F658A в СООН-домен РА-гена в комбинации с включением в геном вирулентного штамма ts-мутаций из генов ХА штаммов вируса гриппа приводило к получению трансфектантов, обладающих фенотипическими характеристиками, типичными зля кандидатов в живые гриппозные вакцины. Заключение. Показана возможность получения аттенуированных вариантов вируса гриппа путем включения специально подобранных сайт-специфических мутаций в консервативную последовательность РА-гена.</p></trans-abstract><kwd-group xml:lang="en"><kwd>influenza virus</kwd><kwd>site-specific mutations</kwd><kwd>transfectants</kwd><kwd>attenuation</kwd><kwd>PA-gene</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>вирус гриппа</kwd><kwd>сайт-специфические мутации</kwd><kwd>трансфектанты</kwd><kwd>аттенуация</kwd><kwd>РА-ген</kwd></kwd-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Алексадрова Г.И., Климов А.И. Живая вакцина против гриппа. Санкт-Петербург. Наука, 1994.</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Гендон Ю.З., Маркушин С.Г., Цфасман Т.М. и др. Новые холодоадаптированные штаммы-доноры аттенуации для живых вакцин против гриппа. 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