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Research Article

Time of feeding and the intrinsic circadian clock drive rhythms in hepatic gene expression

Christopher Vollmers, Shubhroz Gill, Luciano Di Tacchio, Sandhya R. Pulivarthy, Hiep D. Le, and Satchidananda Panda
PNAS first published November 25, 2009; https://doi.org/10.1073/pnas.0909591106
Christopher Vollmers
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Shubhroz Gill
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Luciano Di Tacchio
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Sandhya R. Pulivarthy
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Hiep D. Le
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Satchidananda Panda
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  • For correspondence: panda@salk.edu
  1. Edited by Ronald M. Evans, The Salk Institute for Biological Studies, La Jolla, CA, and approved October 13, 2009 (received for review August 24, 2009)

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Abstract

In mammals, the circadian oscillator generates approximately 24-h rhythms in feeding behavior, even under constant environmental conditions. Livers of mice held under constant darkness exhibit circadian rhythm in abundance in up to 15% of expressed transcripts. Therefore, oscillations in hepatic transcripts could be driven by rhythmic food intake or sustained by the hepatic circadian oscillator, or a combination of both. To address this question, we used distinct feeding and fasting paradigms on wild-type (WT) and circadian clock-deficient mice. We monitored temporal patterns of feeding and hepatic transcription. Both food availability and the temporal pattern of feeding determined the repertoire, phase, and amplitude of the circadian transcriptome in WT liver. In the absence of feeding, only a small subset of transcripts continued to express circadian patterns. Conversely, temporally restricted feeding restored rhythmic transcription of hundreds of genes in oscillator-deficient mouse liver. Our findings show that both temporal pattern of food intake and the circadian clock drive rhythmic transcription, thereby highlighting temporal regulation of hepatic transcription as an emergent property of the circadian system.

  • CREB
  • metabolism
  • mouse liver
  • circadian rhythms

Footnotes

  • 1To whom correspondence should be addressed. E-mail: panda{at}salk.edu
  • Author contributions: C.V., L.D., and S.P. designed research; C.V., S.R.P., and H.D.L. performed research; C.V., S.G., and S.P. analyzed data; and C.V. and S.P. wrote the paper.

  • The authors declare no conflict of interest.

  • This article is a PNAS Direct Submission.

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Time of feeding and the intrinsic circadian clock drive rhythms in hepatic gene expression
Christopher Vollmers, Shubhroz Gill, Luciano Di Tacchio, Sandhya R. Pulivarthy, Hiep D. Le, Satchidananda Panda
Proceedings of the National Academy of Sciences Nov 2009, pnas.0909591106; DOI: 10.1073/pnas.0909591106

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Time of feeding and the intrinsic circadian clock drive rhythms in hepatic gene expression
Christopher Vollmers, Shubhroz Gill, Luciano Di Tacchio, Sandhya R. Pulivarthy, Hiep D. Le, Satchidananda Panda
Proceedings of the National Academy of Sciences Nov 2009, pnas.0909591106; DOI: 10.1073/pnas.0909591106
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