Retinoblastoma tumor suppressor protein-dependent methylation of histone H3 lysine 27 is associated with irreversible cell cycle exit.

Retinoblastoma tumor suppressor protein-dependent methylation of histone H3 lysine 27 is associated with irreversible cell cycle exit.
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视网膜母细胞瘤抑制组蛋白H3赖氨酸27的蛋白质依赖性甲基化与不可逆的细胞周期出口有关。

DOI:
10.1083/jcb.200705051
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发表时间:
2007-12-31
影响因子:
7.8
通讯作者:
Dynlacht, Brian David
Dynlacht, Brian David
中科院分区:
生物学1区
文献类型:
--
作者:
Blais, Alexandre;van Oevelen, Chris J. C.;Margueron, Raphael;Acosta-Alvear, Diego;Dynlacht, Brian David

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视网膜母细胞瘤肿瘤抑制蛋白(PRB)参与有丝分裂退出,促进成肌细胞的停滞和成肌细胞分化。然而,目前尚不清楚在分化的肌肉中如何维持永久的细胞周期退出。利用RNA干扰、表达谱和染色质免疫沉淀,我们证明了pRb对于细胞周期退出和成肌细胞的分化是必不可少的,并且在肌管中也是唯一需要维持这种停滞的。值得注意的是,我们还发现了与pRb相关的蛋白p107和p130作为G2/M期检查点的执行者的功能,该检查点防止失去pRb的细胞进展到有丝分裂。我们进一步证明,PRB通过维持组蛋白H3赖氨酸27(H3K27)在细胞周期基因上的三甲基化而影响永久的细胞周期退出。H3K27三甲基化以pRb非依赖但多梳依赖的方式沉默其他基因,包括Cyclin D1。因此,我们的数据区分了两种不同的基于染色质的调控机制,它们导致了末端分化。
The retinoblastoma tumor suppressor protein (pRb) is involved in mitotic exit, promoting the arrest of myoblasts, and myogenic differentiation. However, it is unclear how permanent cell cycle exit is maintained in differentiated muscle. Using RNA interference, expression profiling, and chromatin immunoprecipitations, we show that pRb is essential for cell cycle exit and the differentiation of myoblasts and is also uniquely required to maintain this arrest in myotubes. Remarkably, we also uncover a function for the pRb-related proteins p107 and p130 as enforcers of a G2/M phase checkpoint that prevents progression into mitosis in cells that have lost pRb. We further demonstrate that pRb effects permanent cell cycle exit in part by maintaining trimethylation of histone H3 lysine 27 (H3K27) on cell cycle genes. H3K27 trimethylation silences other genes, including Cyclin D1, in a pRb-independent but polycomb-dependent manner. Thus, our data distinguish two distinct chromatin-based regulatory mechanisms that lead to terminal differentiation.
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