人类昼夜突变的建模可以让我们了解PER2对时钟的调节
1Department of Neurology, University of California, San Francisco, San Francisco, CA 94158, USA.
Cell
|January 16, 2007
概括
一个人类的2期 (hPER2) 基因突变通过影响PER2酸化,导致晚期睡眠阶段综合征. 具有这种突变的转基因小鼠模仿了人类的状况,揭示了氨酸激酶Idelta对生理时钟调节的洞察力.
科学领域:
- 时间生物学 时间生物学
- 分子遗传学 分子遗传学
- 睡眠的药物 睡眠的药物
背景情况:
- 循环节律控制着24小时的生理和行为周期.
- 家庭高级睡眠阶段综合征 (FASPS) 与人类第2期 (hPER2) 基因的突变有关,该基因对于光感应的中央时钟重置至关重要.
- 与FASPS相关的hPER2 S662G突变损害了因酶I (CKI) 的体外酸化.
研究的目的:
- 为了研究FASPS hPER2 S662G突变的体内影响.
- 阐明hPER2酸化在昼夜节律调节中的作用.
- 了解素激酶I三角酶 (CKIdelta) 对PER2调节和昼夜时间调节的贡献.
主要方法:
- 产生了表达FASPS hPER2 S662G突变的转基因小鼠.
- 在体外和体内评估PER2的酸化状态.
- 量化的PER2转录和降解.
- 在转基因小鼠模型中操纵了CKIdelta的剂量.
主要成果:
- 携带hPER2 S662G突变的转基因小鼠准确地重复了人类的FASPS表型.
- 酸化PER2的血清662 (S662) 已被证明可以增加其转录.
- 酸化在不同的位置似乎促进PER2降解.
- 调节CKIdelta水平改变了与S662相关的表型,证实了CKIdelta在通过PER2调节昼夜周期中的作用.
结论:
- hPER2 S662G突变通过影响PER2酸化来破坏昼夜时间,导致FASPS.
- 在S662处的PER2酸化积极调节PER2转录,而在其他位点的酸化则调节降解.
- 通过调节PER2酸化和稳定性,CCIdelta是昼夜周期的关键调节者.
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