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Intercellular coupling confers robustness against mutations in the SCN circadian clock network

Academic Article
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Overview

authors

  • Liu, A. C.
  • Welsh, D. K.
  • Ko, C. H.
  • Tran, H. G.
  • Zhang, E. E.
  • Priest, A. A.
  • Buhr, E. D.
  • Singer, O.
  • Meeker, K.
  • Verma, I. M.
  • Doyle III, F. J.
  • Takahashi, J. S.
  • Kay, Steve A.

publication date

  • May 2007

journal

  • Cell  Journal

abstract

  • Molecular mechanisms of the mammalian circadian clock have been studied primarily by genetic perturbation and behavioral analysis. Here, we used bioluminescence imaging to monitor Per2 gene expression in tissues and cells from clock mutant mice. We discovered that Per1 and Cry1 are required for sustained rhythms in peripheral tissues and cells, and in neurons dissociated from the suprachiasmatic nuclei (SCN). Per2 is also required for sustained rhythms, whereas Cry2 and Per3 deficiencies cause only period length defects. However, oscillator network interactions in the SCN can compensate for Per1 or Cry1 deficiency, preserving sustained rhythmicity in mutant SCN slices and behavior. Thus, behavior does not necessarily reflect cell-autonomous clock phenotypes. Our studies reveal previously unappreciated requirements for Per1, Per2, and Cry1 in sustaining cellular circadian rhythmicity and demonstrate that SCN intercellular coupling is essential not only to synchronize component cellular oscillators but also for robustness against genetic perturbations.

subject areas

  • Animals
  • Biological Clocks
  • Cell Cycle Proteins
  • Cells, Cultured
  • Circadian Rhythm
  • Cryptochromes
  • Fibroblasts
  • Flavoproteins
  • Mice
  • Motor Activity
  • Mutation
  • Neurons
  • Nuclear Proteins
  • Period Circadian Proteins
  • Suprachiasmatic Nucleus
  • Transcription Factors
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Identity

PubMed Central ID

  • PMC3749832

International Standard Serial Number (ISSN)

  • 0092-8674

Digital Object Identifier (DOI)

  • 10.1016/j.cell.2007.02.047

PubMed ID

  • 17482552
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Additional Document Info

start page

  • 605

end page

  • 616

volume

  • 129

issue

  • 3

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