首页> 外文期刊>Neuron >Setting clock speed in mammals: the CK1 epsilon tau mutation in mice accelerates circadian pacemakers by selectively destabilizing PERIOD proteins.
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Setting clock speed in mammals: the CK1 epsilon tau mutation in mice accelerates circadian pacemakers by selectively destabilizing PERIOD proteins.

机译:设定哺乳动物的时钟速度:小鼠中的CK1 epsilon tau突变通过选择性破坏PERIOD蛋白来加速昼夜节律。

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摘要

The intrinsic period of circadian clocks is their defining adaptive property. To identify the biochemical mechanisms whereby casein kinase1 (CK1) determines circadian period in mammals, we created mouse null and tau mutants of Ck1 epsilon. Circadian period lengthened in CK1epsilon-/-, whereas CK1epsilon(tau/tau) shortened circadian period of behavior in vivo and suprachiasmatic nucleus firing rates in vitro, by accelerating PERIOD-dependent molecular feedback loops. CK1epsilon(tau/tau) also accelerated molecular oscillations in peripheral tissues, revealing its global role in circadian pacemaking. CK1epsilon(tau) acted by promoting degradation of both nuclear and cytoplasmic PERIOD, but not CRYPTOCHROME, proteins. Together, these whole-animal and biochemical studies explain how tau, as a gain-of-function mutation, acts at a specific circadian phase to promote degradation of PERIOD proteins and thereby accelerate the mammalian clockwork in brain and periphery.
机译:昼夜节律时钟的固有周期是它们定义的自适应属性。为了确定酪蛋白激酶1(CK1)确定哺乳动物昼夜节律的生化机制,我们创建了Ck1 epsilon的小鼠无效和tau突变体。 CK1epsilon-/-的昼夜节律周期延长,而CK1epsilon(tau / tau)通过加速PERIOD依赖的分子反馈回路,缩短了体内的昼夜节律行为周期和体外视交叉上核的激发速率。 CK1epsilon(tau / tau)还加速了周围组织的分子振荡,从而揭示了其在昼夜节律中的整体作用。 CK1epsilon(tau)通过促进核和细胞质PERIOD而不是CRYPTOCHROME蛋白的降解而起作用。这些全动物和生化研究共同解释了作为功能获得性突变的tau在特定的昼夜节律阶段如何促进PERIOD蛋白的降解,从而加速了哺乳动物在大脑和周围的发条。

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