在你的标志上,得到SET (D2),去! H3K36me3素数DNA不匹配的修复
Christine K Schmidt1, Stephen P Jackson
1The Gurdon Institute and the Department of Biochemistry, University of Cambridge, Cambridge, UK.
Cell
|April 30, 2013
概括
通过SETD2对Lys36 (H3K36me3) 上的希斯H3的三甲基化有助于DNA修复. 这一发现解释了MMR缺陷癌症,通过展示H3K36me3如何准修复机械到染色素.
科学领域:
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 分子生物学分子生物学
- 癌症生物学 癌症生物学
背景情况:
- 由SETD2催化的lysine 36 (H3K36me3) 上的histon H3三甲基化,是一种已知的表观遗传标记,与活性基因转录相关.
- DNA不匹配修复 (MMR) 对基因组稳定性至关重要,其缺陷与各种癌症有关.
研究的目的:
- 为了研究H3K36me3在转录调节之外的新型作用.
- 阐明H3K36me3影响DNA不匹配修复 (MMR) 的机制.
主要方法:
- 染色体免疫沉 (ChIP) 测试以评估H3K36me3的分布.
- 细胞周期分析以与MMR机械局部化相关联H3K36me3水平.
- 功能性试验评估H3K36me3对MMR效率的影响.
主要成果:
- H3K36me3被确定为DNA不匹配修复 (MMR) 的关键促进者.
- 这项研究表明,H3K36me3在细胞周期期间积极向MMR机制的染色体.
- 这种向机制为MMR缺陷癌症的某些实例提供了分子解释.
结论:
- H3K36me3通过招募MMR蛋白质到染色质中,在促进DNA不匹配修复方面发挥着关键作用.
- 这种表观遗传机制对于保持基因组完整性至关重要,在MMR缺乏的癌症中可能受到调节.
相关概念视频
Mismatch Repair
Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
Mismatch Repair
Overview
Mismatch Repair
Overview
Fixing Double-strand Breaks
The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
Fixing Double-strand Breaks
The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
Homologous Recombination
The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...


