Insights into p53 transcriptional function via genome-wide chromatin occupancy and gene expression analysis.

Insights into p53 transcriptional function via genome-wide chromatin occupancy and gene expression analysis.
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DOI:
10.1038/cdd.2012.89
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发表时间:
2012-12
影响因子:
12.4
通讯作者:
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中科院分区:
生物学1区
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抑癌基因p53可以诱导多种生物学反应。然而,目前尚不清楚是否是p53在体内启动子的选择性,触发不同的转录程序,导致不同的结果。我们使用染色质免疫沉淀(ChIP)-seq对p53的全基因组染色质占有率进行的分析揭示了“p53默认程序”,即主要p53结合位点的模式在p53被nutlin 3a激活,p53再激活和诱导肿瘤细胞凋亡(RITA)或5-氟尿嘧啶在乳腺癌细胞中相似,尽管生物学结果不同。基因表达的平行分析允许鉴定280个新的p53靶基因,包括p53抑制的AURKA。我们确定Sp1为p53调节剂之一,其赋予RITA对p53介导的转录反应的特异性。此外,我们发现STAT 3拮抗p53介导的对包括AURKA在内的一部分基因的抑制。
The tumor-suppressor p53 can induce various biological responses. Yet, it is not clear whether it is p53 in vivo promoter selectivity that triggers different transcription programs leading to different outcomes. Our analysis of genome-wide chromatin occupancy by p53 using chromatin immunoprecipitation (ChIP)-seq revealed ‘p53 default program', that is, the pattern of major p53-bound sites that is similar upon p53 activation by nutlin3a, reactivation of p53 and induction of tumor cell apoptosis (RITA) or 5-fluorouracil in breast cancer cells, despite different biological outcomes. Parallel analysis of gene expression allowed identification of 280 novel p53 target genes, including p53-repressed AURKA. We identified Sp1 as one of the p53 modulators, which confer specificity to p53-mediated transcriptional response upon RITA. Further, we found that STAT3 antagonizes p53-mediated repression of a subset of genes, including AURKA.
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