Transcription factor AP1 potentiates chromatin accessibility and glucocorticoid receptor binding.

Transcription factor AP1 potentiates chromatin accessibility and glucocorticoid receptor binding.
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DOI:
10.1016/j.molcel.2011.06.016
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发表时间:
2011-07-08
期刊:
影响因子:
16
通讯作者:
Hager GL
Hager GL
中科院分区:
生物学1区
文献类型:
--
作者:
Biddie SC;John S;Sabo PJ;Thurman RE;Johnson TA;Schiltz RL;Miranda TB;Sung MH;Trump S;Lightman SL;Vinson C;Stamatoyannopoulos JA;Hager GL

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核受体糖皮质激素受体(GR)的配体依赖性转录是通过与共调节因子的相互作用介导的。这些相互作用在决定GR与调控元件的选择性结合中的作用尚不清楚。最近的研究结果表明,大部分基因组GR结合与激素治疗前可接近的染色质一致,表明受体结合是由维持染色质处于开放状态的蛋白质决定的。结合dna ei可及性和染色质免疫沉淀与高通量测序,我们确定了激活蛋白1 (AP1)是产生gr -染色质相互作用的主要伙伴。AP1对于gr调控的转录和共占用的调控元件的募集至关重要,这说明了一个广泛的AP1- gr相互作用网络。重要的是,维持基线染色质可及性有助于GR的募集,并且依赖于AP1的结合。我们提出了一个模型,其中转录因子的基础占用作用于启动染色质和直接诱导转录因子来选择基因组中的区域。
Ligand-dependent transcription by the nuclear receptor glucocorticoid receptor (GR) is mediated by interactions with co-regulators. The role of these interactions in determining selective binding of GR to regulatory elements remains unclear. Recent findings indicate a large fraction of genomic GR binding coincides with chromatin that is accessible prior to hormone treatment, suggesting that receptor binding is dictated by proteins that maintain chromatin in an open state. Combining DNaseI accessibility and chromatin immunoprecipitation with high-throughput sequencing, we identify the activator protein 1 (AP1) as a major partner for productive GR-chromatin interactions. AP1 is critical for GR-regulated transcription and recruitment to co-occupied regulatory elements, illustrating an extensive AP1-GR interaction network. Importantly, the maintenance of baseline chromatin accessibility facilitates GR recruitment and is dependent on AP1 binding. We propose a model where the basal occupancy of transcription factors act to prime chromatin and direct inducible transcription factors to select regions in the genome.
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