Antagonism between MES-4 and Polycomb repressive complex 2 promotes appropriate gene expression in C. elegans germ cells.

Antagonism between MES-4 and Polycomb repressive complex 2 promotes appropriate gene expression in C. elegans germ cells.
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DOI:
10.1016/j.celrep.2012.09.019
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发表时间:
2012-11-29
期刊:
影响因子:
8.8
通讯作者:
Strome S
Strome S
中科院分区:
生物学1区
文献类型:
--
作者:
Gaydos LJ;Rechtsteiner A;Egelhofer TA;Carroll CR;Strome S

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梭线虫MES蛋白是种系的关键染色质调节剂。MES-2、MES-3和MES-6形成C. elegans多梳抑制复合物2并产生抑制性H3 K27 me 3。MES-4在生殖系表达的基因上产生H3 K36 me 3。切割的突变体生殖系的转录谱分析显示,MES-2/3/6和MES-4合作,以促进生殖系基因的表达和沉默的X染色体和体细胞基因。基于全基因组染色质免疫沉淀,H3 K27 me 3和H3 K36 me 3在常染色体上占据相互排斥的结构域,并且H3 K27 me 3在X染色体上富集。MES-4从生殖系基因的缺失导致H3 K27 me 3扩散到生殖系基因,导致常染色体上其他地方,特别是X染色体上的H3 K27 me 3减少。我们的研究结果支持一个模型,其中H3 K36 me 3排斥H3 K27 me 3从生殖系基因,并集中在基因组的其他区域。这种拮抗作用确保了生殖细胞基因表达的正确模式,包括沉默体细胞基因和X染色体。
The C. elegans MES proteins are key chromatin regulators of the germline. MES-2, MES-3, and MES-6 form the C. elegans Polycomb Repressive Complex 2 and generate repressive H3K27me3. MES-4 generates H3K36me3 on germline-expressed genes. Transcript profiling of dissected mutant germlines revealed that MES-2/3/6 and MES-4 cooperate to promote expression of germline genes and silence the X chromosomes and somatic genes. Based on genome-wide chromatin immunoprecipitation, H3K27me3 and H3K36me3 occupy mutually exclusive domains on the autosomes and H3K27me3 is enriched on the X. Loss of MES-4 from germline genes causes H3K27me3 to spread to germline genes, resulting in reduced H3K27me3 elsewhere on the autosomes and especially on the X. Our findings support a model in which H3K36me3 repels H3K27me3 from germline genes and concentrates it on other regions of the genome. This antagonism ensures proper patterns of gene expression for germ cells, which includes silencing somatic genes and the X chromosomes.
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