在生理时钟的代谢补偿中,RasGEF介导途径的功能得到保护
Orsolya Sárkány1, Anita Szőke1, Aladár Pettkó-Szandtner2
1Department of Physiology, Semmelweis University, Budapest, Hungary.
The FEBS journal
|May 3, 2025
概括
这项研究揭示了RasGEF蛋白如何通过控制基因表达来帮助昼夜钟适应低葡萄糖. 这种机制从真菌保存到哺乳动物,确保在饥饿期间保持日常节奏.
科学领域:
- 时间生物学 时间生物学
- 分子生物学分子生物学
- 代谢调节 代谢调节 代谢调节
背景情况:
- 循环时钟在各种营养条件中保持内生计时,这对适应至关重要.
- 代谢补偿允许生物调整日常节奏以适应环境变化,即使在营养稀缺期间也是如此.
研究的目的:
- 确定参与饥饿下代谢补偿的新型时钟控制基因.
- 研究RasGEF在葡萄糖稀缺期间调节昼夜时钟的作用.
- 探索不同生物体中昼夜钟适应葡萄糖水平的保存机制.
主要方法:
- 在Neurospora crassa中识别和表征了新的时钟控制基因rasgef.
- 利用基因删除突变来评估对昼夜时钟功能和基因表达的影响.
- 研究了RasGEF蛋白的依赖葡萄糖的酸化和局部化.
- 研究了RasGEF同类SOS1和下游ERK信号在哺乳动物细胞中的作用.
主要成果:
- 删除rasgef 损害了对葡萄糖耗尽的代谢补偿,并在Neurospora crassa中破坏了ccg2节律表达.
- RasGEF蛋白显示出依赖葡萄糖的酸化和局部化.
- 哺乳动物的昼夜时钟周期在不同的葡萄糖水平上得到补偿.
- 哺乳动物的时钟适应葡萄糖饥饿取决于SOS1和ERK信号.
结论:
- 在饥饿条件下,RasGEF在昼夜时钟的代谢补偿中发挥着至关重要的作用.
- 通过RasGEF介导的信号传递在物种之间保持,以在葡萄糖限制下维持昼夜节律.
- 这项研究突出了营养可用性和昼夜时间之间的保守分子联系.
关键词:
在BMAL1中,埃尔克·埃尔克是什么意思这种神经虫是Neurospora crassa.在 RAS 路径上.拉斯盖夫 (RasGEF) 是一个国家.这就是SOS1的意义.在CAMP中,我们可以使用cAMP.昼夜节律 昼夜节律代谢补偿是一种代谢补偿.更多相关视频
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