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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Asynchronous oscillations of two zebrafish CLOCK partners reveal differential clock control and function
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Asynchronous oscillations of two zebrafish CLOCK partners reveal differential clock control and function

机译:两个斑马鱼CLOCK伙伴的异步振荡揭示了差分时钟控制和功能

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摘要

Most clock genes encode transcription factors that interact to elicit cooperative control of clock function. Using a two-hybrid system approach, we have isolated two different partners of zebrafish (zfl CLOCK, which are similar to the mammalian BMAL1 (brain and muscle arylhydrocarbon receptor nuclear translocator-like protein 1). The two homologs, zfBMAL1 and zfBMAL2, contain conserved basic helix--loop--helix-PAS (Period-Arylhydrocarbon receptor- Singleminded) domains but diverge in the carboxyl termini. thus bearing different transcriptional activation potential. As for zf Clock. the expression of both zf Bmals oscillates in most tissues in the animal. However. in many tissues. the peak. levels, and kinetics of expression are different between the two genes and for the same gene from tissue to tissue. These results support the exis- tence of independent peripheral oscillators and suggest that zfB- MA L1 and zf BMAL2 may exert distinct circadian functions. inter- acting differentially with zf CLOCK at various times in different tissues. Our findings also indicate that multiple controls may be exerted by the central clock and/or that peripheral oscillators can differentially interpret central clock signals.
机译:大多数时钟基因编码的转录因子相互作用,以引起对时钟功能的协同控制。使用双杂交系统方法,我们分离了斑马鱼的两个不同伴侣(zfl CLOCK,与哺乳动物BMAL1相似(大脑和肌肉中的芳基碳氢化合物受体核转运蛋白1),这两个同系物zfBMAL1和zfBMAL2包含保守的基本螺旋-环-螺旋-PAS(Period-Arylhydrocarbon receptor-Singleminded)结构域但在羧基末端发散,因此具有不同的转录激活潜能。至于zf Clock,这两个zf Bmals的表达在大多数组织中都在振荡。然而,在许多组织中,这两个基因之间的峰值,水平和表达动力学是不同的,并且同一基因在组织之间也不同,这些结果支持存在独立的外围振荡器,这表明zfB- MA L1和zf BMAL2可能发挥不同的昼夜节律功能,在不同组织中的不同时间与zf CLOCK相互作用,我们的发现还表明,多个对照可能会由中央时钟施加和/或外围振荡器可以差分地解释中央时钟信号。

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