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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.

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