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PRC1 Catalytic Activity Is Central to Polycomb System Function.
Molecular Cell ( IF 14.5 ) Pub Date : 2019-12-27 , DOI: 10.1016/j.molcel.2019.12.001
Neil P Blackledge 1 , Nadezda A Fursova 1 , Jessica R Kelley 1 , Miles K Huseyin 1 , Angelika Feldmann 1 , Robert J Klose 1
Affiliation  

The Polycomb repressive system is an essential chromatin-based regulator of gene expression. Despite being extensively studied, how the Polycomb system selects its target genes is poorly understood, and whether its histone-modifying activities are required for transcriptional repression remains controversial. Here, we directly test the requirement for PRC1 catalytic activity in Polycomb system function. To achieve this, we develop a conditional mutation system in embryonic stem cells that completely removes PRC1 catalytic activity. Using this system, we demonstrate that catalysis by PRC1 drives Polycomb chromatin domain formation and long-range chromatin interactions. Furthermore, we show that variant PRC1 complexes with DNA-binding activities occupy target sites independently of PRC1 catalytic activity, providing a putative mechanism for Polycomb target site selection. Finally, we discover that Polycomb-mediated gene repression requires PRC1 catalytic activity. Together these discoveries provide compelling evidence that PRC1 catalysis is central to Polycomb system function and gene regulation.

中文翻译:


PRC1 催化活性是 Polycomb 系统功能的核心。



Polycomb 抑制系统是一种重要的基于染色质的基因表达调节因子。尽管进行了广泛的研究,但人们对 Polycomb 系统如何选择其靶基因知之甚少,并且其组蛋白修饰活性是否是转录抑制所必需的仍然存在争议。这里,我们直接测试Polycomb系统功能中PRC1催化活性的要求。为了实现这一目标,我们在胚胎干细胞中开发了一种条件突变系统,该系统完全消除了 PRC1 的催化活性。使用该系统,我们证明 PRC1 的催化作用可驱动 Polycomb 染色质结构域的形成和长程染色质相互作用。此外,我们发现具有 DNA 结合活性的变体 PRC1 复合物占据独立于 PRC1 催化活性的靶位点,为 Polycomb 靶位点选择提供了假定的机制。最后,我们发现 Polycomb 介导的基因抑制需要 PRC1 催化活性。这些发现共同提供了令人信服的证据,证明 PRC1 催化对于 Polycomb 系统功能和基因调控至关重要。
更新日期:2019-12-27
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