Circadian clock mechanism driving mammalian photoperiodism
Circadian clock mechanism driving mammalian photoperiodism
复制标题
驱动哺乳动物光周期的昼夜节律时钟机制
DOI:
10.1038/s41467-020-18061-z
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发表时间:
2020
影响因子:
16.6
通讯作者:
Wood S
中科院分区:
文献类型:
--
作者:
Wood S
The annual photoperiod cycle provides the critical environmental cue synchronizing rhythms of life in seasonal habitats. In 1936, Bünning proposed a circadian-based coincidence timer for photoperiodic synchronization in plants. Formal studies support the universality of this so-called coincidence timer, but we lack understanding of the mechanisms involved. Here we show in mammals that long photoperiods induce the circadian transcription factorBMAL2, in thepars tuberalisof the pituitary, and triggers summer biology through the eyes absent/thyrotrophin (EYA3/TSH) pathway. Conversely, long-duration melatonin signals on short photoperiods induce circadian repressors includingDEC1, suppressing BMAL2 and the EYA3/TSH pathway, triggering winter biology. These actions are associated with progressive genome-wide changes in chromatin state, elaborating the effect of the circadian coincidence timer. Hence, circadian clock-pituitary epigenetic pathway interactions form the basis of the mammalian coincidence timer mechanism. Our results constitute a blueprint for circadian-based seasonal timekeeping in vertebrates.
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