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Механизм своеобразной "войны промоторов" раскрыли в группе Александра Акуличева в Оксфорде. Оказывается, некодирующая РНК препятствует сборке преинициаторного комплекса РНК-полимеразы II, взаимодействуя с одним из его компонентов - TFIIB. Более того, некодирующая РНК способна напрямую связываться с промоторной областью гена DHFR. Группе Акуличева удалось показать специфическое взаимодействие некодирующей РНК с TFIIB in vitro с помощью гель-шифтов и in vivo при помощи РНК-ChIP. Механизм ингибирования основного промотора DHFR напоминает феномен эпигенетической регуляции промоторов с помощью малых РНК, искусственно введенных в клетку. По ряду причин многие из статей, посвященные описанию этого феномена, были отозваны. Остается надеяться, что работа группы Акуличева не последует их печальному примеру. Ссылки по теме:На рис. - минорный промотор гена DHFR подавляет активность мажорного промотора. Этот эффект можно наблюдать in trans. Все дело в некодирующей РНК. Рис из статьи. Martianov I et al., Nature. (2007); 445:666-70 Файл/ы:
Сообщение в колонке новостей, раздел "Наука: общая и молекулярная биология" 28.02.2007 09:00 |
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