PERIOD2::LUCIFERASE real-time reporting of circadian dynamics reveals persistent circadian oscillations in mouse peripheral tissues
- PMID: 14963227
- PMCID: PMC397382
- DOI: 10.1073/pnas.0308709101
PERIOD2::LUCIFERASE real-time reporting of circadian dynamics reveals persistent circadian oscillations in mouse peripheral tissues
Abstract
Mammalian circadian rhythms are regulated by the suprachiasmatic nucleus (SCN), and current dogma holds that the SCN is required for the expression of circadian rhythms in peripheral tissues. Using a PERIOD2::LUCIFERASE fusion protein as a real-time reporter of circadian dynamics in mice, we report that, contrary to previous work, peripheral tissues are capable of self-sustained circadian oscillations for >20 cycles in isolation. In addition, peripheral organs expressed tissue-specific differences in circadian period and phase. Surprisingly, lesions of the SCN in mPer2(Luciferase) knockin mice did not abolish circadian rhythms in peripheral tissues, but instead caused phase desynchrony among the tissues of individual animals and from animal to animal. These results demonstrate that peripheral tissues express self-sustained, rather than damped, circadian oscillations and suggest the existence of organ-specific synchronizers of circadian rhythms at the cell and tissue level.
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Comment in
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Circadian lessons from peripheral clocks: is the time of the mammalian pacemaker up?Proc Natl Acad Sci U S A. 2004 Apr 20;101(16):5699-700. doi: 10.1073/pnas.0401378101. Epub 2004 Apr 12. Proc Natl Acad Sci U S A. 2004. PMID: 15079063 Free PMC article. No abstract available.
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