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arXiv 1310.5166q-bio.GN
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转录因子结合变异的功能后果

The Functional Consequences of Variation in Transcription Factor Binding

Darren A. Cusanovich, Bryan Pavlovic, Jonathan K. Pritchard, Yoav Gilad

摘要:

人类遗传学的一个目标是了解精确和动态基因表达程序的信息是如何在基因组中编码的。转录因子(TF)与DNA调控元件的相互作用在决定基因表达输出中显然起着重要作用,但对功能性转录因子结合的调控逻辑知之甚少。许多研究都集中在TF结合的基因组位置的特征,但目前还不清楚在何种程度上TF结合在任何特定的基因座有功能的后果方面的基因表达输出。为了评估功能性TF结合的背景,我们在一个HapMap淋巴母细胞系中敲低了59个TF和染色质修饰剂。然后,我们确定了基因的表达受到敲除的影响。我们将基因表达数据与表达基因的转录起始位点的10 kb内的转录因子结合数据(基于ChIP-seq和DNase-seq)进行比较。这种数据组合使我们能够推断功能性TF结合。平均而言,14.7%的基因结合的一个因素的差异表达后,该因素的敲低,表明TF和染色质之间的相互作用不会导致可测量的变化,基因表达水平的推定的靶基因。我们发现,功能性TF结合富集在含有大量TF结合位点的调节元件中,在预测的较高结合亲和力的位点处,以及在注释为活性增强子的基因组区域中富集的位点处。

英文摘要:

One goal of human genetics is to understand how the information for precise and dynamic gene expression programs is encoded in the genome. The interactions of transcription factors (TFs) with DNA regulatory elements clearly play an important role in determining gene expression outputs, yet the regulatory logic underlying functional transcription factor binding is poorly understood. Many studies have focused on characterizing the genomic locations of TF binding, yet it is unclear to what extent TF binding at any specific locus has functional consequences with respect to gene expression output. To evaluate the context of functional TF binding we knocked down 59 TFs and chromatin modifiers in one HapMap lymphoblastoid cell line. We then identified genes whose expression was affected by the knockdowns. We intersected the gene expression data with transcription factor binding data (based on ChIP-seq and DNase-seq) within 10 kb of the transcription start sites of expressed genes. This combination of data allowed us to infer functional TF binding. On average, 14.7% of genes bound by a factor were differentially expressed following the knockdown of that factor, suggesting that most interactions between TF and chromatin do not result in measurable changes in gene expression levels of putative target genes. We found that functional TF binding is enriched in regulatory elements that harbor a large number of TF binding sites, at sites with predicted higher binding affinity, and at sites that are enriched in genomic regions annotated as active enhancers.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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