The molecular control of circadian behavioral rhythms and their entrainment in Drosophila.

The molecular control of circadian behavioral rhythms and their entrainment in Drosophila.
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昼夜节律行为节律的分子控制及其在果蝇中的夹带。

DOI:
10.1146/annurev.biochem.67.1.135
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发表时间:
1998
影响因子:
16.6
通讯作者:
M. W. Young
M. W. Young
中科院分区:
生物学1区
文献类型:
--
作者:
M. W. Young

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果蝇昼夜节律的分子和遗传特征表明,细胞内起搏器的功能需要由三个基因编码的蛋白质的活动:周期(per),无时间(tim)和双时间(dbt)。来自其中两个基因per和tim的RNA以昼夜节律表达。PER和TIM蛋白的异源二聚化允许核定位和通过PER/TIM复合物抑制进一步的RNA合成。这些蛋白质相互作用促进循环基因表达,因为异二聚体仅在高浓度的PER和TIM RNA下观察到,将RNA积累的间隔与PER/TIM复合物活性的时间分开。光通过消除TIM来重置这些分子周期。dbt的产物还调节PER和TIM RNA的积累,并且它可能影响PER/TIM复合物的作用。最近在小鼠和人类中发现的PER同源物表明,一种相关的机制控制着哺乳动物的昼夜行为节律。
Molecular and genetic characterizations of circadian rhythms in Drosophila indicate that function of an intracellular pacemaker requires the activities of proteins encoded by three genes: period (per), timeless (tim), and doubletime (dbt). RNA from two of these genes, per and tim, is expressed with a circadian rhythm. Heterodimerization of PER and TIM proteins allows nuclear localization and suppression of further RNA synthesis by a PER/TIM complex. These protein interactions promote cyclical gene expression because heterodimers are observed only at high concentrations of per and tim RNA, separating intervals of RNA accumulation from times of PER/TIM complex activity. Light resets these molecular cycles by eliminating TIM. The product of dbt also regulates accumulation of per and tim RNA, and it may influence action of the PER/TIM complex. The recent discovery of PER homologues in mice and humans suggests that a related mechanism controls mammalian circadian behavioral rhythms.
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