title: Casein kinase 1 delta (CK1delta) regulates period length of the mouse suprachiasmatic circadian clock in vitro.
abstract: BACKGROUND
  Casein kinase 1 delta (CK1delta) plays a more prominent role in the regulation of circadian cycle length than its homologue casein kinase 1 epsilon (CK1epsilon) in peripheral tissues such as liver and embryonic fibroblasts. Mice lacking CK1delta die shortly after birth, so it has not been possible to assess the impact of loss of CK1delta on behavioral rhythms controlled by the master circadian oscillator in the suprachiasmatic nuclei (SCN).
  
  
  RESULTS
  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 CK1delta-deficient mice oscillate, but with a longer circadian period than littermate controls. The cycle length of rhythms recorded from neonatal SCN explants of CK1epsilon-deficient mice did not differ from control explants.
  
  
  CONCLUSIONS
  The results indicate that CK1delta plays a more prominent role than CK1epsilon in the maintenance of 24-hour rhythms in the master circadian oscillator.
authors.affiliation: Department of Neurobiology, University of Massachusetts Medical School, Worcester, Massachusetts, United States of America.
authors.forename: Jean-Pierre
authors.initials: JP
authors.lastname: Etchegaray
authors.forename: Elizabeth A
authors.initials: EA
authors.lastname: Yu
authors.forename: Premananda
authors.initials: P
authors.lastname: Indic
authors.forename: Robert
authors.initials: R
authors.lastname: Dallmann
authors.forename: David R
authors.initials: DR
authors.lastname: Weaver
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D048149:Casein Kinase 1 epsilon / Q000502:physiology; D048148:Casein Kinase Idelta / Q000502:physiology*; D002478:Cells, Cultured; D002940:Circadian Rhythm; D008156:Luciferases / Q000032:analysis; D051379:Mice; D056950:Period Circadian Proteins / Q000032:analysis; D013493:Suprachiasmatic Nucleus / Q000166:cytology / Q000378:metabolism*
chemical_list: C513312:Per2 protein, mouse; D056950:Period Circadian Proteins; D008156:Luciferases; D048149:Casein Kinase 1 epsilon; D048148:Casein Kinase Idelta