CDK-APC/C振荡器主要用于周期细胞循环转录
Sahand Jamal Rahi1, Kresti Pecani2, Andrej Ondracka2
1Laboratory of Cell Cycle Genetics, The Rockefeller University, 1230 York Avenue, New York, NY 10065, USA; Center for Studies in Physics and Biology, The Rockefeller University, 1230 York Avenue, New York, NY 10065, USA.
Cell
|April 9, 2016
概括
细胞周期基因表达主要由CDK-APC/C蛋白控制. 然而,SIC1基因起到安全作用,甚至在线粒细胞循环蛋白低水平时也能促进核分裂.
科学领域:
- 细胞生物学
- 分子生物学
- 遗传学
背景情况:
- 细胞周期进展涉及振荡基因表达,对于调节至关重要.
- 一个关键的问题是,这种振荡是通过CDK-APC/C蛋白或分散的转录因子 (TF) 级联控制的.
研究的目的:
- 在发芽的酵母中研究细胞周期进展过程中基因表达的调节机制.
- 确定CDK-APC/C蛋白与TF级联在控制转录振荡中的作用.
主要方法:
- 用RNA测序 (RNA-seq) 来评估全基因组转录.
- 单细胞光显微镜观察基因表达动态.
- 数学建模和实验验证.
主要成果:
- CDK-APC/C蛋白质决定了发芽酵母中几乎所有基因的转录.
- 在CDK-APC/C捕获过程中,有三种异常基因表现出脉动性转录模式.
- 详细研究了B型环林的抑制剂SIC1的转录.
结论:
- 这项研究提供了Sic1作为故障安全机制的证据.
- 当线性环素水平较低时,Sic1促进核分裂,这是一个反直觉的发现.
- 这突显了在一个主要集中的系统中特定基因的分散调节作用.
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