Ring1B is crucial for the regulation of developmental control genes and PRC1 proteins but not X inactivation in embryonic cells.

Ring1B is crucial for the regulation of developmental control genes and PRC1 proteins but not X inactivation in embryonic cells.
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RING1B对于调节发育控制基因和PRC1蛋白而言至关重要,而不是胚胎细胞中的X失活。

DOI:
10.1083/jcb.200612127
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发表时间:
2007-07-16
影响因子:
7.8
通讯作者:
Wutz, Anton
Wutz, Anton
中科院分区:
生物学1区
文献类型:
--
作者:
Leeb, Martin;Wutz, Anton

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Polycomb group(PcG)基因Ring1B与发育控制基因的抑制和X染色体失活有关,是胚胎发生所必需的。Ring1B蛋白含有一个RING指结构域,并作为E3泛素连接酶发挥功能,该酶对组蛋白H2A(H2AK119ub1)的单泛素化至关重要。在这里,我们研究Ring1B在小鼠胚胎干细胞(ES)中的功能。Ring1B的缺失导致几种PcG蛋白的丢失,在PcG蛋白水平的调节中显示出意想不到的功能。在Ring1B缺陷的ES细胞中观察到谱系基因的去抑制和异常分化潜能。尽管Ring1B在建立组蛋白H2A赖氨酸119(H2AK119ub1)在ES细胞中Xist表达后的染色体范围内的泛素化中具有重要功能,但Xist沉默的启动与Ring1B无关。其他染色质标记与启动X失活不受影响,在环1B缺陷的细胞,这表明补偿损失环1B在X失活的抑制谱系基因相反。
The Polycomb group (PcG) gene Ring1B has been implicated in the repression of developmental control genes and X inactivation and is essential for embryogenesis. Ring1B protein contains a RING finger domain and functions as an E3 ubiquitin ligase that is crucial for the monoubiquitination of histone H2A (H2AK119ub1). Here, we study the function of Ring1B in mouse embryonic stem (ES) cells. The deletion of Ring1B causes the loss of several PcG proteins, showing an unanticipated function in the regulation of PcG protein levels. Derepression of lineage genes and an aberrant differentiation potential is observed in Ring1B-deficient ES cells. Despite a crucial function of Ring1B in establishing the chromosome-wide ubiquitination of histone H2A lysine 119 (H2AK119ub1) upon Xist expression in ES cells, the initiation of silencing by Xist is independent of Ring1B. Other chromatin marks associated with the initiation of X inactivation are not affected in Ring1B-deficient cells, suggesting compensation for the loss of Ring1B in X inactivation in contrast to the repression of lineage genes.
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发表时间: 2006-02
影响因子: 21.3
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期刊: HYBRIDOMA
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