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- W2103758039 abstract "Disruption of the circadian timing system arising from travel between time zones (jet lag) and rotational shift work impairs mental and physical performance and severely compromises long-term health. Circadian disruption is more severe during adaptation to advances in local time, because the circadian clock takes much longer to phase advance than delay. The recent identification of mammalian circadian clock genes now makes it possible to examine time zone adjustments from the perspective of molecular events within the suprachiasmatic nucleus (SCN), the principal circadian oscillator. Current models of the clockwork posit interlocked transcriptional/post-translational feedback loops based on the light-sensitive Period (Per) genes and the Cryptochrome (Cry) genes, which are indirectly regulated by light. We show that circadian cycles of mPer expression in the mouse SCN react rapidly to an advance in the lighting schedule, whereas rhythmic mCry1 expression advances more slowly, in parallel to the gradual resetting of the activity-rest cycle. In contrast, during a delay in local time the mPer and mCry cycles react rapidly, completing the 6 hr shift together by the second cycle, in parallel with the activity-rest cycle. These results reveal the potential for dissociation of mPer and mCry expression within the central oscillator during circadian resetting and a differential molecular response of the clock during advance and delay resetting. They highlight the indirect photic regulation of mCry1 as a potentially rate-limiting factor in behavioral adjustment to time zone transitions." @default.
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- W2103758039 date "2002-09-01" @default.
- W2103758039 modified "2023-10-13" @default.
- W2103758039 title "Differential Resynchronisation of Circadian Clock Gene Expression within the Suprachiasmatic Nuclei of Mice Subjected to Experimental Jet Lag" @default.
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- W2103758039 doi "https://doi.org/10.1523/jneurosci.22-17-07326.2002" @default.
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