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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">Acta Naturae</journal-id><journal-title-group><journal-title xml:lang="en">Acta Naturae</journal-title><trans-title-group xml:lang="ru"><trans-title>Acta Naturae</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2075-8251</issn><publisher><publisher-name xml:lang="en">Acta Naturae Ltd</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">10476</article-id><article-id pub-id-type="doi">10.32607/20758251-2015-7-4-97-106</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Research Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Экспериментальные 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">A Model System in S2 Cells to Test the Functional Activities of Drosophila Insulators</article-title><trans-title-group xml:lang="ru"><trans-title>Модельная система в клетках S2 для тестирования функциональной активности инсуляторов дрозофилы</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Tikhonov</surname><given-names>M. V.</given-names></name><name xml:lang="ru"><surname>Тихонов</surname><given-names>M. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>mog@genebiology.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Gasanov</surname><given-names>N. B.</given-names></name><name xml:lang="ru"><surname>Гасанов</surname><given-names>Н. Б.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>mog@genebiology.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Georgiev</surname><given-names>P. G.</given-names></name><name xml:lang="ru"><surname>Георгиев</surname><given-names>П. Г.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>mog@genebiology.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Maksimenko</surname><given-names>O. G.</given-names></name><name xml:lang="ru"><surname>Максименко</surname><given-names>O. Г.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>mog@genebiology.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Institute of Gene Biology Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Институт биологии гена РАН</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2015-12-15" publication-format="electronic"><day>15</day><month>12</month><year>2015</year></pub-date><volume>7</volume><issue>4</issue><issue-title xml:lang="en">VOL 7, NO4 (2015)</issue-title><issue-title xml:lang="ru">ТОМ 7, №4 (2015)</issue-title><fpage>97</fpage><lpage>106</lpage><history><date date-type="received" iso-8601-date="2020-01-17"><day>17</day><month>01</month><year>2020</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2015, Tikhonov M.V., Gasanov N.B., Georgiev P.G., Maksimenko O.G.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2015, Тихонов M.В., Гасанов Н.Б., Георгиев П.Г., Максименко O.Г.</copyright-statement><copyright-year>2015</copyright-year><copyright-holder xml:lang="en">Tikhonov M.V., Gasanov N.B., Georgiev P.G., Maksimenko O.G.</copyright-holder><copyright-holder xml:lang="ru">Тихонов M.В., Гасанов Н.Б., Георгиев П.Г., Максименко O.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://actanaturae.ru/2075-8251/article/view/10476">https://actanaturae.ru/2075-8251/article/view/10476</self-uri><abstract xml:lang="en"><p>Insulators are a special class of regulatory elements that can regulate interactions between enhancers and promoters in the genome of high eukaryotes. To date, the mechanisms of insulator action remain unknown, which is primarily related to the lack of convenient model systems. We suggested studying a model system which is based on transient expression of a plasmid with an enhancer of the copia transposable element, in Drosophila embryonic cell lines. We demonstrated that during transient transfection of circle plasmids with a well-known Drosophila insulator from the gypsy retrotransposon, the insulator exhibits in an enhancer-blocking assay the same properties as in Drosophila stable transgenic lines. Therefore, the Drosophila cell line is suitable for studying the main activities of insulators, which provides additional opportunities for investigating the functional role of certain insulator proteins.</p></abstract><trans-abstract xml:lang="ru"><p>Инсуляторы - особый класс регуляторных элементов, способных участвовать в установлении взаимодействий между энхансерами и промоторами в геноме высших эукариот. Механизмы действия инсуляторов не выяснены, что во многом связано с отсутствием удобных модельных систем. Нами продолжено изучение модельной системы, основанной на транзиентной экспрессии плазмиды, содержащей энхансер мобильного элемента copia, в культурах эмбриональных клеток дрозофилы. Показано, что при транзиентной трансфекции кольцевых плазмид входящий в их состав наиболее хорошо изученный инсулятор дрозофилы, найденный в мобильном элементе МДГ4, проявляет при блокировании энхансеров такие же свойства, как и в стабильных трансгенных линиях дрозофилы. Таким образом, в культуре клеток дрозофилы можно изучать основные свойства инсуляторов, что дает дополнительные возможности для исследования функциональной роли отдельных инсуляторных белков.</p></trans-abstract><kwd-group xml:lang="en"><kwd>insulator</kwd><kwd>copia enhancer</kwd><kwd>Su(Hw)</kwd><kwd>enhancer transcription</kwd><kwd>hsp70 promoter</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>инсуляторы</kwd><kwd>энхансер copia</kwd><kwd>Su(Hw)</kwd><kwd>транскрипция с энхансера</kwd><kwd>hsp70-промотор</kwd></kwd-group><funding-group><funding-statement xml:lang="en">This work was supported by the Russian Science Foundation (project No. 14-24-00166).</funding-statement><funding-statement xml:lang="ru">Работа выполнена при поддержке Российского научного фонда (проект № 14-24-00166).</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>[1] Maksimenko O., Georgiev P. // Front. 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