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Widespread activation of developmental gene expression characterized by PRC1-dependent chromatin looping

机译:PRC1依赖性染色质循环特征的发育基因表达的广泛激活

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Polycomb repressive complexes 1 and 2 have been historically described as transcriptional repressors, but recent reports suggest that PRC1 might also support activation, although the underlying mechanisms remain elusive. Here, we show that stage-specific PRC1 binding at a subset of active promoters and enhancers during Drosophila development coincides with the formation of three-dimensional (3D) loops, an increase in expression during development and repression in PRC1 mutants. Dissection of the dachshund locus indicates that PRC1-anchored loops are versatile architectural platforms that persist when surrounding genes are transcriptionally active and fine-tune their expression. The analysis of RING1B binding profiles and 3D contacts during neural differentiation in mice suggests that this role is conserved in mammals.
机译:Polycomb抑制复合物1和2已被历史上被描述为转录压缩机,但最近的报告表明,虽然潜在机制仍然难以捉摸,但PRC1也可能支持激活。在这里,我们表明,在果蝇发育期间在活性启动子和增强剂的子集中结合在果蝇发育期间与三维(3D)环的形成一致,在PRC1突变体中的开发和抑制过程中表达增加。解剖达克犬基因座表示,PRC1锚定环是通用建筑平台,当周围基因转录活跃和微调其表达时持续存在。在小鼠神经分化期间Ring1b结合谱和3D触点的分析表明,这种作用在哺乳动物中被保守。

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