The polycomb group mutant esc leads to augmented levels of paused Pol II in the Drosophila embryo.

The polycomb group mutant esc leads to augmented levels of paused Pol II in the Drosophila embryo.
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DOI:
10.1016/j.molcel.2011.05.009
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发表时间:
2011-06-24
期刊:
影响因子:
16
通讯作者:
Levine M
Levine M
中科院分区:
生物学1区
文献类型:
--
作者:
Chopra VS;Hendrix DA;Core LJ;Tsui C;Lis JT;Levine M

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许多发育控制基因含有暂停的RNA聚合酶II(POL II),因此在果蝇早期胚胎中为快速和同步激活做好了准备。有证据表明,多聚梳组(PcG)抑制物可以影响暂停的Pol II。采用芯片和Gro-Seq分析方法检测了Pol II、H3K27me3和H3K4me3在额外性梳(ESC)突变胚胎中的全基因组分布。ESC是多梳抑制复合体2(PRC2)的关键成分,它介导H3K27me3的修饰。在ESC突变胚胎中观察到数千个基因的POLII占有率增强,包括不受PRC2直接调控的基因。因此,似乎野生型胚胎中缺乏启动子相关的暂停Pol II的沉默基因在ESC突变体中被转化为带有暂停Pol II的“稳定”基因。我们认为,沉默基因到稳定基因的这种转换可能会使分化的细胞类型对PcG突变体中的身份转换敏感。
Many developmental control genes contain paused RNA Polymerase II (Pol II) and are thereby “poised” for rapid and synchronous activation in the early Drosophila embryo. Evidence is presented that Polycomb group (PcG) repressors can influence paused Pol II. ChIP-Seq and GRO-Seq assays were used to determine the genome-wide distributions of Pol II, H3K27me3 and H3K4me3 in extra sex combs (esc) mutant embryos. ESC is a key component of the Polycomb Repressive complex 2 (PRC2), which mediates H3K27me3 modification. Enhanced Pol II occupancy is observed for thousands of genes in esc mutant embryos, including genes not directly regulated by PRC2. Thus, it would appear that silent genes lacking promoter-associated paused Pol II in wild-type embryos are converted into “poised” genes with paused Pol II in esc mutants. We suggest that this conversion of silent genes into poised genes might render differentiated cell types susceptible to switches in identity in PcG mutants.
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