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Hi-C: A Method to Study the Three-dimensional Architecture of Genomes.
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在氨酸9中甲基化组素h3的目标是在四合体中编程的DNA消除
Sean D Taverna1, Robert S Coyne, C David Allis
1Department of Biochemistry and Molecular Genetics, University of Virginia Health System, Charlottesville, VA 22908, USA.
Cell
|September 26, 2002
概括
基因组H3氨酸9甲基化[Me(Lys9) H3]对于Tetrahymena中编程的DNA消除至关重要,由Pdd1p等染色体蛋白介导. 这种表观遗传标记将异染色蛋白的形成与DNA切除事件联系起来.
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
- 细胞生物学 细胞生物学
背景情况:
- 基因组H3氨酸9甲基化[Me(Lys9) H3]是一种关键的表观遗传标记,与异性染色素和基因沉默有关.
- 染色体蛋白质,如异色染色蛋白1 (Heterochromatin Protein 1),可以识别并结合到Me(Lys9) H3.3.
- 在状四核体中,在宏核发育期间编程的DNA消除涉及染色体蛋白质Pdd1p和Pdd3p.
研究的目的:
- 调查H3(Lys9) Me和Pdd蛋白在Tetrahymena中编程DNA消除中的作用.
- 要确定H3(Lys9) Me是否参与超出转录调节的DNA消除.
- 为了确定异染色素形成和DNA切除之间的联系.
主要方法:
- 在体外结合试验测试来测试蛋白质-DNA相互作用.
- 在体内分析H3(Lys9) Me在宏核发育过程中的定位和时间.
- 基因操纵,包括对Pdd1p的功能丧失研究和绑定实验.
主要成果:
- 在体外,Pdd1p和Pdd3p都与H3(Lys9) Me结合.
- H3(Lys9) Me 特别存在于DNA消除过程中,并与体内消除的DNA序列相关联.
- 失去Pdd1p会显著降低H3的Lys9Me水平.
- 连接Pdd1p可以诱导DNA切除.
结论:
- H3(Lys9) Me参与了Tetrahymena中编程的DNA消除,将其已知的功能扩展到基因沉默之外.
- Pdd1p蛋白在DNA消除部位的招募或建立H3(Lys9) Me中发挥着关键作用.
- 这些发现加强了异染色素形成与编程DNA消除过程之间的联系.
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