凝聚素复合物促进了S. pombe的融合基因之间的转录终止
Monika Gullerova1, Nick J Proudfoot
1Sir William Dunn School of Pathology, University of Oxford, South Parks Rd, Oxford OX1 3RE, UK.
Cell
|March 25, 2008
概括
在S. pombe的双链RNA触发了RNA干扰和异色染色体的形成,招募凝聚蛋白来阻止进一步的dsRNA产生和调节转录终止.
科学领域:
- 分子生物学分子生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 基因规则 基因规则
背景情况:
- 在S. pombe的融合基因在G1阶段产生重叠的转录.
- 双链RNA (dsRNA) 与基因调节有关.
研究的目的:
- 调查dsrna在异染色素形成和转录终止中的作用.
- 在dRNA诱导的表观遗传变化的背景下阐明凝聚素的功能.
主要方法:
- 在S. pombe.中转录的分析.
- 使用Dicer和RITS进行RNA干扰 (RNAi) 途径分析.
- 染色体免疫沉检测基因组修饰 (H3K9me3) 和蛋白质协会 (Swi6,凝聚素).
主要成果:
- dsRNA诱导局部的,依赖于RNAi的异染色素与H3K9me3和Swi6.6.
- 凝聚素通过Swi6.6被招募到这些异色彩区域.
- 凝聚素集中在G2中的融合基因的基因间区域,促进转录终止和阻止dsRNA合成.
- 在线粒分裂时,凝聚素会被释放出来,从而启动一个新的循环.
结论:
- 凝聚素在调节转录终止方面发挥着新的作用.
- 形成dsrna,异色染色体和随后的凝聚素招募是受调节的转录终止的广泛机制.
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