Analysis of transcription factor interactions in osteoblasts using competitive chromatin immunoprecipitation.

Analysis of transcription factor interactions in osteoblasts using competitive chromatin immunoprecipitation.
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使用竞争性染色质免疫沉淀分析成骨细胞中的转录因子相互作用。

DOI:
10.1093/nar/gkn022
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发表时间:
2008-03
影响因子:
14.9
通讯作者:
Franceschi, Renny T.
Franceschi, Renny T.
中科院分区:
生物学2区
文献类型:
--
作者:
Roca, Hernan;Franceschi, Renny T.

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染色质免疫沉淀(ChIP)是一种广泛应用于定量活细胞中蛋白质- dna相互作用的技术。这种方法通常使用固定的(交联的)染色质,通过超声(X-ChIP)破碎。我们开发了一种简单的新芯片程序,用于在没有交联(N-ChIP)的情况下从成骨细胞中分离的超声染色质的免疫沉淀。非交联染色质的使用允许开发一种新的ChIP测定方法:N-ChIP结合含有单个转录因子特定结合位点的双链寡核苷酸(竞争性N-ChIP)。使用这种方法,我们能够区分骨钙素和骨唾液蛋白基因中Runx2转录因子的单个结合位点,这是传统X-ChIP无法分辨的。N-ChIP分析还能够检测到其他几种类型的染色质相互作用,包括与Dlx同源结构域因子和核蛋白(如Sin3a)的相互作用,这些核蛋白缺乏内在的dna结合基序,因此通过与其他蛋白质的相互作用与染色质结合。
Chromatin immunoprecipitation (ChIP) is a widely used technique for quantifying protein–DNA interactions in living cells. This method commonly uses fixed (crosslinked) chromatin that is fragmented by sonication (X-ChIP). We developed a simple new ChIP procedure for the immunoprecipitation of sonicated chromatin isolated from osteoblasts in the absence of crosslinking (N-ChIP). The use of noncrosslinked chromatin allowed development of a new modification of the ChIP assay: the combination of N-ChIP and competition with double-stranded oligonucleotides containing specific binding sites for individual transcription factors (Competitive N-ChIP). Using this approach, we were able to discriminate between individual binding sites for the Runx2 transcription factor in the osteocalcin and bone sialoprotein genes that cannot be resolved by traditional X-ChIP. N-ChIP assays were also able to detect several other types of chromatin interactions including those with Dlx homeodomain factors and nuclear proteins such as Sin3a that lack an intrinsic DNA-binding motif and, therefore, bind to chromatin via interactions with other proteins.
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发表时间: 2006-12-29
影响因子: 4.8
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发表时间: 1997-02-01
期刊: METHODS-A COMPANION TO METHODS IN ENZYMOLOGY
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发表时间: 1997-05-30
期刊: CELL
影响因子: 64.5
作者:
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通讯作者: Olsen, BR