Single-molecule analysis of transcription factor binding at transcription sites in live cells.

Single-molecule analysis of transcription factor binding at transcription sites in live cells.
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DOI:
10.1038/ncomms5456
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发表时间:
2014-07-18
影响因子:
16.6
通讯作者:
McNally, James G.
McNally, James G.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Morisaki, Tatsuya;Mueller, Waltraud G.;Golob, Nicole;Mazza, Davide;McNally, James G.

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虽然许多活细胞的测量表明,转录因子结合染色质瞬时,没有测量的瞬时结合已被报道在内源性反应元件(RE),转录通常是诱导。在这里,我们表明,在内源性RE,转录生产的特异性结合p53和糖皮质激素受体(GR)是短暂的。我们还发现,在一个人工的,多拷贝阵列的基因调控位点的内源性GR RE的停留时间大致相当,支持使用多拷贝阵列的活细胞转录分析。最后,我们发现,在任何时候,只有一小部分的TF分子参与转录生产结合在内源性REs.The小部分的结合因子提供了一个解释基因爆裂,它也表明,REs可能往往是空的,导致部分响应转录信号。
Although numerous live-cell measurements have shown that transcription factors bind chromatin transiently, no measurements of transient binding have been reported at the endogenous response elements (REs) where transcription is normally induced. Here we show that at endogenous REs, the transcriptionally productive specific binding of p53 and of the glucocorticoid receptor (GR) is transient. We also find residence times roughly comparable to that of endogenous GR REs at an artificial, multi-copy array of gene regulatory sites, supporting the use of multi-copy arrays for live-cell analysis of transcription. Finally, we find that at any moment only a small fraction of TF molecules are engaged in transcriptionally productive binding at endogenous REs. The small fraction of bound factors provides one explanation for gene bursting and it also indicates that REs may often be unoccupied, resulting in partial responses to transcriptional signals.
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发表时间: 1994-07-15
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