通过相对脉冲时间调节进行组合基因调节
Yihan Lin1,2, Chang Ho Sohn3, Chiraj K Dalal1,2
1Howard Hughes Medical Institute, California Institute of Technology, Pasadena, California 91125, USA.
Nature
|October 16, 2015
概括
细胞使用转录因子脉冲的时间来控制基因表达. 激活器Msn2和抑制器Mig1通过协调它们的脉冲时间来调节目标基因,从而揭示出一种基于时间的新型基因调节机制.
科学领域:
- 细胞生物学
- 分子生物学
- 系统生物学
背景情况:
- 转录因子通常在单个细胞内以动态的随机脉冲激活.
- 动态脉冲相互作用在控制基因表达中的作用尚不清楚.
研究的目的:
- 调查脉动转录因子 Msn2 和 Mig1 是否用于组合基因调节的相对脉冲时间.
- 阐明Saccharomyces cerevisiae中的基于时间的基因调节机制.
主要方法:
- 在Saccharomyces cerevisiae中进行量化单细胞时间延迟成像.
- 在不同输入和恒定的条件下分析Msn2 (激活器) 和Mig1 (抑制器) 脉冲动态.
- 基于 Msn2 和 Mig1 脉冲的时间重叠的目标基因表达的评估.
主要成果:
- Msn2和Mig1表现出脉冲激活,具有重叠或非重叠的动态.
- 不重叠的 Msn2 和 Mig1 脉冲动态对于有效的目标基因激活至关重要.
- 在恒定的条件下,葡萄糖度调节了 Msn2 和 Mig1 脉冲的时间重叠.
结论:
- 转录因子 Msn2 和 Mig1 的相对脉冲时间是组合基因调节的关键机制.
- 这项研究揭示了细胞系统中基于时间的新型基因调节模式.
- 在工程和神经生物学中常见的时间信号调节被认为在细胞信号传递中具有广泛的功能.
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