UpSET recruits HDAC complexes and restricts chromatin accessibility and acetylation at promoter regions.

UpSET recruits HDAC complexes and restricts chromatin accessibility and acetylation at promoter regions.
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DOI:
10.1016/j.cell.2012.11.009
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发表时间:
2012-12-07
期刊:
影响因子:
64.5
通讯作者:
Groudine M
Groudine M
中科院分区:
生物学1区
文献类型:
--
作者:
Rincon-Arano H;Halow J;Delrow JJ;Parkhurst SM;Groudine M

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发育基因的表达是遗传和表观遗传机制相互作用的结果。在这里,我们描述了upSET,转录调节编码的SET域的蛋白质招募到活性和诱导基因在果蝇。然而,与其他与基因转录相关的果蝇SET蛋白不同,UpSET是含有Rpd 3/Sin 3的复合物的一部分,该复合物限制了染色质可及性和启动子区域的组蛋白乙酰化。在不存在UpSET的情况下,由于组蛋白脱乙酰酶复合物的不稳定,活性染色质标记和染色质可接近性增加并扩散到基因和侧翼区域。与此一致,转录噪音增加,如通过重复元件和脱靶基因的激活所表现的。有趣的是,upSET突变果蝇是雌性不育的,这是由于卵子发生过程中Notch信号传导的关键组分的上调。因此,UpSET定义了一类后生动物转录调节因子,其通过防止活性染色质的扩散来微调转录。
Developmental gene expression results from the orchestrated interplay between genetic and epigenetic mechanisms. Here we describe upSET, a transcriptional regulator encoding a SET domain-containing protein recruited to active and inducible genes in Drosophila. However, unlike other Drosophila SET proteins associated with gene transcription, UpSET is part of an Rpd3/Sin3-containing complex that restricts chromatin accessibility and histone acetylation to promoter regions. In the absence of UpSET, active chromatin marks and chromatin accessibility increase and spread to genic and flanking regions due to destabilization of the histone deacetylase complex. Consistent with this, transcriptional noise increases, as manifest by activation of repetitive elements and off-target genes. Interestingly, upSET mutant flies are female sterile due to up-regulation of key components of Notch signaling during oogenesis. Thus UpSET defines a class of metazoan transcriptional regulators required to fine tune transcription by preventing the spread of active chromatin.
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