期刊
NATURE
卷 469, 期 7331, 页码 554-558出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/nature09654
关键词
-
资金
- BBSRC
- EPSRC [D019621]
- BBSRC/ANR [F005466]
- HFSP
- Wellcome Trust [083643/Z/07/Z]
- MRC Centre for Obesity and Related metabolic Disorders (MRC CORD)
- Biotechnology and Biological Sciences Research Council [BB/D019621/1, BB/F005466/1] Funding Source: researchfish
- BBSRC [BB/D019621/1, BB/F005466/1] Funding Source: UKRI
- Wellcome Trust [083643/Z/07/Z] Funding Source: Wellcome Trust
Circadian rhythms are ubiquitous in eukaryotes, and coordinate numerous aspects of behaviour, physiology and metabolism, from sleep/wake cycles in mammals to growth and photosynthesis in plants(1,2). This daily timekeeping is thought to be driven by transcriptional-translational feedback loops, whereby rhythmic expression of 'clock' gene products regulates the expression of associated genes in approximately 24-hour cycles. The specific transcriptional components differ between phylogenetic kingdoms(3). The unicellular pico-eukaryotic alga Ostreococcus tauri possesses a naturally minimized clock, which includes many features that are shared with plants, such as a central negative feedback loop that involves the morning-expressed CCA1 and evening-expressed TOC1 genes(4). Given that recent observations in animals and plants have revealed prominent post-translational contributions to time-keeping(5), a reappraisal of the transcriptional contribution to oscillator function is overdue. Here we show that non-transcriptional mechanisms are sufficient to sustain circadian timekeeping in the eukaryotic lineage, although they normally function in conjunction with transcriptional components. We identify oxidation of peroxiredoxin proteins as a transcription-independent rhythmic biomarker, which is also rhythmic in mammals(6). Moreover we show that pharmacological modulators of the mammalian clock mechanism have the same effects on rhythms in Ostreococcus. Post-translational mechanisms, and at least one rhythmic marker, seem to be better conserved than transcriptional clock regulators. It is plausible that the oldest oscillator components are non-transcriptional in nature, as in cyanobacteria(7), and are conserved across kingdoms.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据