PhpCNF-Y转录因子透到异色素蛋白中,产生密码的内核含有转录,对于小RNA生产至关重要
Manjit Kumar Srivastav1, H Diego Folco1, Patroula Nathanailidou1
1Laboratory of Biochemistry and Molecular Biology, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA.
研究人员发现了异性染色体中重复的DNA元素是如何转录的. PhpC-NF-Y转录因子复合体启动转录,产生小干扰RNAs (siRNAs),这对于基因沉默和异色染色体组装至关重要.
科学领域:
- 遗传学 是一个遗传学.
- 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.
背景情况:
- 抑制性异种染色体的形成对于真核生物的基因组稳定性至关重要,沉默基因和重复性DNA.
- 矛盾的是,在RNA指导的异性染色体组装中,对异性染色体内的重复元素的转录是必要的,但该机制仍然难以捉摸.
研究的目的:
- 阐明构成性异色染色体内的重复元素被转录的机制.
- 确定涉及异色重复转录和随后的异色染色素形成的转录因子.
主要方法:
- 利用裂变酵母作为一个模型生物.
- 研究了PhpC-NF-Y转录因子复合体和含有转录因子的Zn指的作用.
- 分析了转录因子和CCAAT结合位点突变对重复转录的影响.
- 检查了隐秘的内核和小干扰RNAs (siRNAs) 在异色染色体组合中的作用.
主要成果:
- 保存的三元转录因子 (TF) PhpC-NF-Y复合体透到异色素蛋白中来转录重复元素.
- PhpC-NF-Y与一个Zn指TF一起,在重复促进器中结合了CCAAT盒,驱动了转录.
- TF介导的转录会产生含有密码性内子的转录,这对于通过结合体和RNAi机器产生siRNAs至关重要.
- 在目标重复位置上,siRNA生产对于异性染色素核化至关重要.
结论:
- 揭示了一种通过PhpC-NF-Y复合体转录异色重复的新机制.
- 证明了TF驱动的转录通过siRNA生产启动异染色蛋白沉默.
- 确定了这种途径在异染色质核和基因组稳定性中的关键作用.
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