NDLI: Casein Kinase 1 Delta Regulates the Pace of the Mammalian Circadian Clock ▿ †

Content Provider	PubMed Central
Author	Etchegaray, Jean-pierre Machida, Kazuhiko K. Noton, Elizabeth Constance, Cara M. Dallmann, Robert Napoli, Marianne N. Di Debruyne, Jason P. Lambert, Christopher M. Yu, Elizabeth A. Reppert, Steven M. Weaver, David R.
Abstract	Both casein kinase 1 delta (CK1δ) and epsilon (CK1ɛ) phosphorylate core clock proteins of the mammalian circadian oscillator. To assess the roles of CK1δ and CK1ɛ in the circadian clock mechanism, we generated mice in which the genes encoding these proteins (Csnk1d and Csnk1e, respectively) could be disrupted using the Cre-loxP system. Cre-mediated excision of the floxed exon 2 from Csnk1d led to in-frame splicing and production of a deletion mutant protein (CK1δΔ2). This product is nonfunctional. Mice homozygous for the allele lacking exon 2 die in the perinatal period, so we generated mice with liver-specific disruption of CK1δ. In livers from these mice, daytime levels of nuclear PER proteins, and PER-CRY-CLOCK complexes were elevated. In vitro, the half-life of PER2 was increased by ∼20%, and the period of PER2::luciferase bioluminescence rhythms was 2 h longer than in controls. Fibroblast cultures from CK1δ-deficient embryos also had long-period rhythms. In contrast, disruption of the gene encoding CK1ɛ did not alter these circadian endpoints. These results reveal important functional differences between CK1δ and CK1ɛ: CK1δ plays an unexpectedly important role in maintaining the 24-h circadian cycle length.
Related Links	http://dx.doi.org/10.1128/mcb.00338-09
Ending Page	3866
Page Count	14
Starting Page	3853
File Format	PDF
ISSN	02707306
e-ISSN	10985549
Journal	Molecular and Cellular Biology
Issue Number	14
Volume Number	29
Language	English
Publisher	American Society for Microbiology (ASM)
Publisher Date	2009-07-15
Access Restriction	Open
Rights Holder	American Society for Microbiology (ASM)
Subject Keyword	Cell Biology Molecular Biology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Cell Biology Molecular Biology

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