Nolte Christine, Staiger Dorothee
Molecular Cell Physiology, Faculty of Biology, Bielefeld University Bielefeld, Germany.
Front Plant Sci. 2015 May 5;6:311. doi: 10.3389/fpls.2015.00311. eCollection 2015.
The circadian timing system in plants synchronizes their physiological functions with the environment. This is achieved by a global control of gene expression programs with a considerable part of the transcriptome undergoing 24-h oscillations in steady-state abundance. These circadian oscillations are driven by a set of core clock proteins that generate their own 24-h rhythm through periodic feedback on their own transcription. Additionally, post-transcriptional events are instrumental for oscillations of core clock genes and genes in clock output. Here we provide an update on molecular events at the RNA level that contribute to the 24-h rhythm of the core clock proteins and shape the circadian transcriptome. We focus on the circadian system of the model plant Arabidopsis thaliana but also discuss selected regulatory principles in other organisms.
植物中的昼夜节律系统使其生理功能与环境同步。这是通过对基因表达程序的全局控制实现的，相当一部分转录组在稳态丰度上经历24小时振荡。这些昼夜节律振荡由一组核心时钟蛋白驱动，这些蛋白通过对自身转录的周期性反馈产生自身的24小时节律。此外，转录后事件对核心时钟基因和时钟输出基因的振荡也起作用。在这里，我们提供了RNA水平上分子事件的最新进展，这些事件有助于核心时钟蛋白的24小时节律并塑造昼夜转录组。我们重点关注模式植物拟南芥的昼夜节律系统，但也讨论了其他生物体中选定的调控原理。
