DFF-ChIP:一种检测和量化RNA聚合酶II,转录因子和染色质之间的复杂相互作用的方法
Benjamin M Spector1, Juan F Santana1, Miles A Pufall1
1Department of Biochemistry and Molecular Biology, The University of Iowa, Iowa City, IA 52242, USA.
Nucleic acids research
|September 9, 2024
概括
我们改进了DNA碎片化因子 (DFF) -ChIP方法,以精确地绘制转录复合体的地图. 这种技术揭示了蛋白质相互作用和占用细节,这些细节被标准的ChIP-Seq和CUT&RUN.遗漏了.
科学领域:
- 分子生物学分子生物学
- 基因组学就是基因组学.
- 生物化学 生物化学
背景情况:
- 染色体免疫沉 (ChIP) 对于研究DNA-蛋白相互作用至关重要.
- 现有的ChIP方法在精确定位转录复合物及其相互作用方面存在局限性.
研究的目的:
- 扩展和完善DNA碎片化因子 (DFF) -ChIP技术,以提高精度.
- 更详细地研究转录因子和复合物的占用情况.
主要方法:
- 利用人类DNA碎片化因子 (DFF) 在免疫沉之前进行向DNA消化 (DFF-ChIP).
- 分析了Mediator,DSIF和NELF的子单位,以及转录因子CTCF和葡萄糖皮质体受体 (GR).
- 与标准的ChIP-Seq (超声波) 和CUT&RUN (MNase消化) 进行了DFF-CHIP结果的比较.
主要成果:
- 调解器几乎只在预启动综合体 (PIC) 中发现.
- 与参与的RNA聚合酶II (Pol II) 和潜在的启动中间体相关的DSIF和NELF.
- DFF-ChIP提供了CTCF和GR的详细占用信息,有或没有交叉链接,揭示了蛋白质:蛋白质相互作用.
结论:
- 与现有的方法相比,DFF-ChIP为绘制转录复合体及其相互作用提供了更高的分辨率.
- 该技术提供了对蛋白质:蛋白质相互作用和占用动态的洞察,这些动态无法通过标准的ChIP-Seq或CUT&RUN来辨认.
更多相关视频
相关概念视频
02:36Chromatin Immunoprecipitation- ChIP
11.1K
Chromatin immunoprecipitation, or ChIP, is an antibody-based technique used to identify sites on DNA that bind to transcription factors of interest or histone proteins. It also helps determine the type of histone modifications such as acetylation, phosphorylation, or methylation.
Types of ChIP
ChIP can be divided into two types - X-ChIP and N-ChIP. X-ChIP involves in vivo cross-linking of histones and regulatory proteins to DNA, fragmenting the DNA by sonication, and isolating the protein-DNA...
Types of ChIP
ChIP can be divided into two types - X-ChIP and N-ChIP. X-ChIP involves in vivo cross-linking of histones and regulatory proteins to DNA, fragmenting the DNA by sonication, and isolating the protein-DNA...
11.1K
02:36RNA Polymerase II Accessory Proteins
9.1K
Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...
9.1K