Accurate H3K27 methylation can be established de novo by SUZ12-directed PRC2.

Accurate H3K27 methylation can be established de novo by SUZ12-directed PRC2.
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DOI:
10.1038/s41594-018-0036-6
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发表时间:
2018-03
影响因子:
16.8
通讯作者:
Helin K
Helin K
中科院分区:
生物学1区
文献类型:
--
作者:
Højfeldt JW;Laugesen A;Willumsen BM;Damhofer H;Hedehus L;Tvardovskiy A;Mohammad F;Jensen ON;Helin K

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Polycomb 抑制复合物 2 (PRC2) 催化 H3K27 甲基化,是维持转录模式和细胞身份所必需的,但基因组 PRC2 结合和 H3K27 甲基化模式的规范和维持仍不完全清楚。已经提出了表观遗传机制,其中预先存在的 H3K27 甲基化指导 PRC2 的招募并调节催化活性以支持其自身的维持。在这里,我们研究了在小鼠胚胎干细胞 (mESC) 中指定 H3K27 甲基化模式是否需要这种机制。通过在失去所有 H3K27 甲基化的基因敲除中重新表达 PRC2 亚基,我们证明可以从头准确地建立甲基化模式。我们发现区域甲基化动力学与原始甲基化模式相关,即使它们不存在,并且基因组 PRC2 结合模式的规范被保留,并且特别依赖于 PRC2 核心亚基 SUZ12。因此,mESC 中的 H3K27 甲基化模式不依赖于自主表观遗传。
The Polycomb repressive complex 2 (PRC2) catalyzes H3K27 methylation and is required for maintaining transcriptional patterns and cellular identity, but the specification and maintenance of genomic PRC2 binding and H3K27 methylation patterns remain incompletely understood. Epigenetic mechanisms have been proposed, wherein pre-existing H3K27 methylation directs recruitment and regulates the catalytic activity of PRC2 to support its own maintenance. Here we investigate if such mechanisms are required for specifying H3K27 methylation patterns in mouse embryonic stem cells (mESCs). Through re-expression of PRC2 subunits in genetic knockouts that have lost all H3K27 methylation, we demonstrate that methylation patterns can be accurately established de novo. We find that regional methylation kinetics correlate with original methylation patterns even in their absence, and specification of the genomic PRC2 binding pattern is retained and specifically dependent on the PRC2 core-subunit SUZ12. Thus, the H3K27 methylation patterns in mESCs are not dependent on self-autonomous epigenetic inheritance.
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