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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">Cell and Tissue Biology</journal-id><journal-title-group><journal-title xml:lang="en">Cell and Tissue Biology</journal-title><trans-title-group xml:lang="ru"><trans-title>Цитология</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0041-3771</issn><issn publication-format="electronic">3034-6061</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">669594</article-id><article-id pub-id-type="doi">10.31857/S0041377124030052</article-id><article-id pub-id-type="edn">PEKAZN</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>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">EMSA-SELEX-seq method for analysis of binding site sequences in DNA-protein complexes</article-title><trans-title-group xml:lang="ru"><trans-title>Метод EMSA‒SELEX‒seq для анализа последовательностей сайтов связывания в комплексах ДНК‒белок</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Nazarov</surname><given-names>I. B.</given-names></name><name xml:lang="ru"><surname>Назаров</surname><given-names>И. Б.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>i.nazarov@incras.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Gordeev</surname><given-names>M. N.</given-names></name><name xml:lang="ru"><surname>Гордеев</surname><given-names>М. Н.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>i.nazarov@incras.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kuzmin</surname><given-names>A. A.</given-names></name><name xml:lang="ru"><surname>Кузьмин</surname><given-names>А. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>i.nazarov@incras.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Zilov</surname><given-names>D. S.</given-names></name><name xml:lang="ru"><surname>Зилов</surname><given-names>Д. С.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>i.nazarov@incras.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Potapenko</surname><given-names>E. V.</given-names></name><name xml:lang="ru"><surname>Потапенко</surname><given-names>Е. В.</given-names></name></name-alternatives><address><country country="IL">Israel</country></address><bio xml:lang="en"><p>Institute of Evolution, Department of Evolutionary and Environmental Biology</p></bio><bio xml:lang="ru"><p>Институт эволюционного развития, отдел эволюции и биологии окружающей среды</p></bio><email>i.nazarov@incras.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Tomilin</surname><given-names>A. N.</given-names></name><name xml:lang="ru"><surname>Томилин</surname><given-names>А. Н.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>a.tomilin@incras.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Institute of Cytology RAS</institution></aff><aff><institution xml:lang="ru">Институт цитологии РАН</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">University of Haifa</institution></aff><aff><institution xml:lang="ru">Университет Хайфы</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2024-05-15" publication-format="electronic"><day>15</day><month>05</month><year>2024</year></pub-date><volume>66</volume><issue>3</issue><issue-title xml:lang="ru"/><fpage>253</fpage><lpage>258</lpage><history><date date-type="received" iso-8601-date="2025-02-27"><day>27</day><month>02</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2024, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2024, Российская академия наук</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="en">Russian Academy of Sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder></permissions><self-uri xlink:href="https://vietnamjournal.ru/0041-3771/article/view/669594">https://vietnamjournal.ru/0041-3771/article/view/669594</self-uri><abstract xml:lang="en"><p>The BOB1 protein (OBF1, OCA-B) is a transcriptional coactivator of two POU domain proteins — OCT1, expressed in all cells, and lymphoid-specific OCT2. The interaction of BOB1 with OCT1/2 plays an important role in the regulation of immune responses in both physiological and pathological contexts. BOB1 is known to form a ternary complex with OCT1/2 bound to DNA in monomeric and certain dimeric configurations, changing the sequence specificity of the binding. To analyze DNA sequences from these complexes, in this work we proposed the EMSA-SELEX-seq method, based on the separation of OCT/BOB1 complexes of various compositions in a non-denaturing polyacrylamide gel (EMSA) followed by the isolation and amplification of the oligonucleotides that they contain (SELEX). Based on several rounds of the enrichment followed by the NGS sequencing and bioinformatics analysis, the DNA sequences were determined and the relevance of this approach was confirmed. Thus, the proposed EMSA-SELEX-seq method allows the analysis of DNA sequences in DNA-protein complexes with varying dimensions of its protein components.</p></abstract><trans-abstract xml:lang="ru"><p>Белок BOB1 (OBF1, OCA-B) представляет собой траскрипционный коактиватор двух POU-доменных белков: экспресирующегося во всех клетках OCT1 и лимфоид-специфического OCT2. Взаимодействие BOB1 с OCT1/2 играет важную роль в регуляции иммунных ответов как в физиологическом, так и в патологическом контексте. Известно, что BOB1 образует тройной комплекс с OCT1/2 связанных с ДНК в мономерных и определенных димерных конфигурациях, меняя сиквенс-специфичность такого связывания. Для анализа последовательностей ДНК из этих комплексов в настоящей работе нами предложен метод EMSA-SELEX-seq, основанный на разделении OCT/BOB1 комплексов различного состава в неденатурирующем полиакриламидном геле (EMSA) с последующим выделением и амплификациией содержащихся в них олигонуклотидов (SELEX). На основании нескольких раундов такого обогащения с последующим NGS-секвенированием и биоинформатическим анализом были определены ДНК-последовательности и подтверждена релевантность данного подхода. Таким образом, предложенный метод EMSA-SELEX-seq позволяет проводить анализ последовательностей ДНК в сложных ДНК-белковых комплексах с различающейся мерностью его белковых компонентов.</p></trans-abstract><kwd-group xml:lang="en"><kwd>EMSA</kwd><kwd>SELEX</kwd><kwd>NGS sequencing</kwd><kwd>OCT1</kwd><kwd>OCT2</kwd><kwd>BOB1</kwd><kwd>OBF1</kwd><kwd>OCA-B</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>EMSA</kwd><kwd>SELEX</kwd><kwd>NGS секвенирование</kwd><kwd>OCT1</kwd><kwd>OCT2</kwd><kwd>BOB1</kwd><kwd>OBF1</kwd><kwd>OCA-B</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Российский Научный Фонд</institution></institution-wrap><institution-wrap><institution xml:lang="en">Russian Science Foundation</institution></institution-wrap></funding-source><award-id>21-14-00369</award-id></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Bailey T. 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