Short RNAs are transcribed from repressed polycomb target genes and interact with polycomb repressive complex-2.

Short RNAs are transcribed from repressed polycomb target genes and interact with polycomb repressive complex-2.
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DOI:
10.1016/j.molcel.2010.03.019
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发表时间:
2010-06-11
期刊:
影响因子:
16
通讯作者:
Jenner RG
Jenner RG
中科院分区:
生物学1区
文献类型:
--
作者:
Kanhere A;Viiri K;Araújo CC;Rasaiyaah J;Bouwman RD;Whyte WA;Pereira CF;Brookes E;Walker K;Bell GW;Pombo A;Fisher AG;Young RA;Jenner RG

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多梳蛋白通过抑制对其他细胞类型特异性的发育调节因子的表达来维持细胞的同一性。多梳抑制复合物-2(PRC 2)催化组蛋白H3赖氨酸-27(H3 K27 me 3)的三甲基化。尽管PRC 2靶点被抑制,但通常与转录起始标记H3 K4 me 3相关,但其意义仍不清楚。在这里,我们鉴定了一类新的短RNA,长度约为50-200个核苷酸,从原代T细胞和胚胎干细胞中多梳靶基因的5′端转录。短RNA转录与RNA聚合酶II和H3 K4 me 3相关,在mRNA转录不存在的情况下发生,并且不依赖于polycomb活性。短RNA形成类似于Xist中PRC 2结合位点的茎环结构,通过SUZ 12与PRC 2相互作用,引起顺式基因阻遏,并从细胞分化期间激活的多梳靶基因中耗尽。我们提出短RNA在PRC 2与其靶基因的关联中起作用。
Polycomb proteins maintain cell identity by repressing the expression of developmental regulators specific for other cell types. Polycomb repressive complex-2 (PRC2) catalyses trimethylation of histone H3 lysine-27 (H3K27me3). Although repressed, PRC2 targets are generally associated with the transcriptional initiation marker H3K4me3 but the significance of this remains unclear. Here, we identify a new class of short RNAs, ~50-200 nucleotides in length, transcribed from the 5′-end of polycomb target genes in primary T-cells and embryonic stem cells. Short RNA transcription is associated with RNA polymerase II and H3K4me3, occurs in the absence of mRNA transcription and is independent of polycomb activity. Short RNAs form stem-loop structures resembling PRC2 binding sites in Xist, interact with PRC2 through SUZ12, cause gene repression in cis and are depleted from polycomb target genes activated during cell differentiation. We propose that short RNAs play a role in the association of PRC2 with its target genes.
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