Casein Kinase 1 Delta (CK1δ) Regulates Period Length of the Mouse Suprachiasmatic Circadian Clock In Vitro

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Casein Kinase 1 Delta (CK1δ) Regulates Period Length of the Mouse Suprachiasmatic Circadian Clock In Vitro

Authors
Publisher
Public Library of Science
Volume
5
Issue
4
Identifiers
DOI: 10.1371/journal.pone.0010303
Keywords
  • Neuroscience
  • Research Article
  • Cell Biology/Gene Expression
  • Biochemistry/Transcription And Translation
  • Molecular Biology/Post-Translational Regulation Of Gene Expression
  • Neuroscience/Behavioral Neuroscience
  • Mathematics/Algorithms
  • Neuroscience/Neural Homeostasis

Abstract

Background Casein kinase 1 delta (CK1δ) plays a more prominent role in the regulation of circadian cycle length than its homologue casein kinase 1 epsilon (CK1ε) in peripheral tissues such as liver and embryonic fibroblasts. Mice lacking CK1δ die shortly after birth, so it has not been possible to assess the impact of loss of CK1δ on behavioral rhythms controlled by the master circadian oscillator in the suprachiasmatic nuclei (SCN). Methodology/Principal Findings In the present study, mPER2::LUCIFERASE bioluminescence rhythms were monitored from SCN explants collected from neonatal mice. The data demonstrate that SCN explants from neonatal CK1δ-deficient mice oscillate, but with a longer circadian period than littermate controls. The cycle length of rhythms recorded from neonatal SCN explants of CK1ε-deficient mice did not differ from control explants. Conclusions/Significance The results indicate that CK1δ plays a more prominent role than CK1ε in the maintenance of 24-hour rhythms in the master circadian oscillator.

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