Chromatin: receiver and quarterback for cellular signals.

Chromatin: receiver and quarterback for cellular signals.
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DOI:
10.1016/j.cell.2013.01.017
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发表时间:
2013-02-14
期刊:
影响因子:
64.5
通讯作者:
Dent SY
Dent SY
中科院分区:
生物学1区
文献类型:
--
作者:
Johnson DG;Dent SY

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信号转导途径最终汇聚在序列特异性DNA结合因子上,以重新编程基因表达并影响细胞生长或行为的必要变化。转录因子,反过来,与染色质修饰活动,包括酶,后修饰组蛋白。染色质也被动态修饰以调节DNA复制和修复的可及性。然而,染色质不仅仅是信号通路的终点。组蛋白修饰可以将信号传递给其他蛋白质,从而引发比通过改变基因转录所能实现的更直接的反应。这样的信号可能是特别重要的时间紧迫的过程,如执行细胞周期检查点,染色体分离,或退出有丝分裂。此外,组蛋白修饰酶通常具有多种非组蛋白底物,并且针对不同靶标的活性的协调可能将信号引导至染色质和从染色质引导信号。
Signal transduction pathways ultimately converge upon sequence-specific DNA binding factors to reprogram gene expression and affect necessary changes in cellular growth or behavior. Transcription factors, in turn, team up with chromatin modifying activities, including enzymes that post-translationally modify histones. Chromatin is also dynamically modified to regulate DNA accessibility for replication and repair. However, chromatin is not simply an endpoint for signaling pathways. Histone modifications can relay signals to other proteins to trigger more immediate responses than can be achieved through altered gene transcription. Such signaling might be especially important to time-urgent processes such as the execution of cell cycle check points, chromosome segregation, or exit from mitosis. In addition, histone modifying enzymes often have multiple non-histone substrates, and coordination of activity towards different targets might direct signals both to and from chromatin.
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