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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="brief-report" 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">11663</article-id><article-id pub-id-type="doi">10.32607/actanaturae.11663</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Short communications</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Краткие сообщения</subject></subj-group><subj-group subj-group-type="article-type"><subject>Short Communication</subject></subj-group></article-categories><title-group><article-title xml:lang="en">High-Affinity Single-Domain Antibodies for Analyzing Human Apo- and Holo-Transferrin</article-title><trans-title-group xml:lang="ru"><trans-title>Высокоаффинные однодоменные антитела для анализа апо- и голотрансферрина человека</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Tillib</surname><given-names>Sergei V.</given-names></name><name xml:lang="ru"><surname>Тиллиб</surname><given-names>Сергей Владимирович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>tillib@genebiology.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Goryainova</surname><given-names>Oksana S.</given-names></name><name xml:lang="ru"><surname>Горяйнова</surname><given-names>Оксана Сергеевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>tillib@genebiology.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Sachko</surname><given-names>Anastasiya M.</given-names></name><name xml:lang="ru"><surname>Сачко</surname><given-names>Анастасия Мартиновна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>tillib@genebiology.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Ivanova</surname><given-names>Tatiana I.</given-names></name><name xml:lang="ru"><surname>Иванова</surname><given-names>Татьяна Ильинична</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>tillib@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="2022-07-21" publication-format="electronic"><day>21</day><month>07</month><year>2022</year></pub-date><volume>14</volume><issue>2</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>98</fpage><lpage>102</lpage><history><date date-type="received" iso-8601-date="2021-12-14"><day>14</day><month>12</month><year>2021</year></date><date date-type="accepted" iso-8601-date="2022-05-31"><day>31</day><month>05</month><year>2022</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2022, Tillib S.V., Goryainova O.S., Sachko A.M., Ivanova T.I.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2022, Тиллиб С.В., Горяйнова О.С., Сачко А.М., Иванова Т.И.</copyright-statement><copyright-year>2022</copyright-year><copyright-holder xml:lang="en">Tillib S.V., Goryainova O.S., Sachko A.M., Ivanova T.I.</copyright-holder><copyright-holder xml:lang="ru">Тиллиб С.В., Горяйнова О.С., Сачко А.М., Иванова Т.И.</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/11663">https://actanaturae.ru/2075-8251/article/view/11663</self-uri><abstract xml:lang="en"><p>A highly efficient technology for generating new monoclonal single-domain recombinant antibodies (nanobodies) was used to obtain a panel of nanobodies recognizing human apo- and/or holo-transferrin. This article is devoted to the primary analysis of the properties of two different variants of the new nanobodies obtained by us, as well as to the demonstration of the unique potential of their application for diagnostic studies. The simultaneous use of immunosorbents based on these nanobodies apparently makes it possible to detect changes in the relative abundance of apo- and holo-transferrin in human biological fluids. Such changes could potentially be indicative of an increased risk or degree of development of pathological processes, such as malignant neoplasms in humans.</p></abstract><trans-abstract xml:lang="ru"><p>С использованием высокоэффективной технологии генерирования новых моноклональных однодоменных рекомбинантных антител (нанотел) получена панель нанотел, узнающих апо- и/или голотрансферрин человека. Проведен первичный анализ свойств двух вариантов новых нанотел, а также показаны уникальные потенциальные возможности их применения в диагностических исследованиях. Параллельное использование иммуносорбентов, создаваемых на основе этих нанотел, позволяет, по-видимому, выявлять изменения в относительной представленности апо- и голотрансферрина в биологических жидкостях человека. Такие изменения потенциально могут отражать повышенный риск или степень развития патологических процессов, например, злокачественных новообразований у человека.</p></trans-abstract><kwd-group xml:lang="en"><kwd>single-domain antibody</kwd><kwd>nanobody</kwd><kwd>apo- and holo-transferrin</kwd><kwd>immunosorbent</kwd><kwd>affinity chromatography</kwd><kwd>diagnostics</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>однодоменное антитело</kwd><kwd>нанотело</kwd><kwd>апо- и голотрансферрин</kwd><kwd>иммуносорбент</kwd><kwd>аффинная хроматография</kwd><kwd>диагностика</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Российский фонд фундаментальных исследований</institution></institution-wrap><institution-wrap><institution xml:lang="en">Russian Foundation for Basic Research</institution></institution-wrap></funding-source><award-id>19-015-00487</award-id></award-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>20-14-00305</award-id></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">Torti S.V., Torti F.M. // Mol Aspects Med. 2020. 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