TALE-mediated modulation of transcriptional enhancers in vivo.

TALE-mediated modulation of transcriptional enhancers in vivo.
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DOI:
10.1038/nmeth.2543
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发表时间:
2013-08
期刊:
影响因子:
48
通讯作者:
Sternbecause, David L.
Sternbecause, David L.
中科院分区:
生物学1区
文献类型:
--
作者:
Crocker, Justin;Sternbecause, David L.

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我们测试了转录激活因子样效应器(TALE)是否可以介导果蝇基因组中内源增强子的抑制和激活。针对五个偶数跳过(eve)“条纹”增强子中每一个的 TALE 抑制子(TALER)产生了专门针对焦点条纹的抑制。针对 eve 启动子或 eve 增强子的 TALE 激活剂 (TALEA) 主要在通常由启动子或靶向增强子激活的细胞中引起表达增加。幼虫和成虫中 TALER 和 TALEA 表达的表型效应与观察到的 eve 表达调节一致。在这些测定中,毛状抑制结构域没有表现出先前描述的长程转录抑制活性。 TALEA 的精确作用支持这样的观点,即抑制以主导方式作用于转录激活子,并且增强子的活性状态影响 TALE 结合或 VP16 增强转录的能力。因此,TALE 提供了一种在天然基因组环境中检测和功能调节转录增强子的新工具。
We tested whether Transcription Activator-Like Effectors (TALEs) can mediate repression and activation of endogenous enhancers in the Drosophila genome. TALE-repressors (TALERs) targeting each of the five even-skipped (eve) “stripe” enhancers generated repression specifically of the focal stripes. TALE-activators (TALEAs) targeting the eve promoter or eve enhancers caused increased expression primarily in cells normally activated by the promoter or targeted enhancer, respectfully. The phenotypic effects of TALER and TALEA expression in larvae and adults are consistent with the observed modulations of eve expression. In these assays, the Hairy repression domain did not exhibit previously described long-range transcriptional repression activity. The precise effects of the TALEAs support the view that repression acts in a dominant fashion on transcriptional activators and that the activity state of an enhancer influences TALE binding or the ability of VP16 to enhance transcription. TALEs thus provide a novel tool for detection and functional modulation of transcriptional enhancers in their native genomic context.
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