在p53的转录激活过程中,SET1和p300通过结合的基因素修饰作用,协同作用
Zhanyun Tang1, Wei-Yi Chen, Miho Shimada
1Laboratory of Biochemistry and Molecular Biology, The Rockefeller University, New York, NY 10065, USA.
Cell
|July 23, 2013
概括
SET1复合体 (SET1C) 和p300通过修改基因素H3的乙化和三甲基化来加强基因转录. 这种机制对于p53介导的基因调节至关重要,特别是在DNA受损后.
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
- 基因规则 基因规则
背景情况:
- 基因组H3 lysine 4三甲基化 (H3K4me3) 与活性基因转录有关.
- 产生H3K4me3的精确机制及其功能作用仍然不完全理解.
研究的目的:
- 阐明H3K4me3生成的机制及其在p53-介导转录中的作用.
- 研究SET1复合体 (SET1C),p53和p300在调节基因表达中的相互作用.
主要方法:
- 在实验室中使用重组染色素和纯化的人体因子进行研究.
- 基于细胞的测定,包括诱导DNA损伤.
- 分析基因组修饰 (乙化和三甲化) 和基因转录.
主要成果:
- 通过SET1C介导的H3K4三甲基化取决于p53-和p300介导的H3乙化.
- 通过H3K4三甲基化,SET1C增强了p53-和p300-依赖的转录.
- 观察到SET1C,p53和p300之间的直接相互作用,表明有针对性的招聘.
- 在p53目标基因p21/WAF1.1上,DNA损伤会诱导p53-SET1C相互作用和SET1C/H3K4me3丰富.
- H3K4的三甲基化和转录是p300和SET1C的共同依赖.
结论:
- 建立了一个机制,SET1C和p300通过直接相互作用和合基因组修饰进行合作.
- 这种合作行动促进了p53在基因调节中的功能.
- 这些发现突出了协调的表观遗传和转录性调节途径.
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