RRC ID 11105
Author Dubruille R, Murad A, Rosbash M, Emery P.
Title A constant light-genetic screen identifies KISMET as a regulator of circadian photoresponses.
Journal PLoS Genet
Abstract Circadian pacemakers are essential to synchronize animal physiology and behavior with the dayrationight cycle. They are self-sustained, but the phase of their oscillations is determined by environmental cues, particularly light intensity and temperature cycles. In Drosophila, light is primarily detected by a dedicated blue-light photoreceptor: CRYPTOCHROME (CRY). Upon light activation, CRY binds to the pacemaker protein TIMELESS (TIM) and triggers its proteasomal degradation, thus resetting the circadian pacemaker. To understand further the CRY input pathway, we conducted a misexpression screen under constant light based on the observation that flies with a disruption in the CRY input pathway remain robustly rhythmic instead of becoming behaviorally arrhythmic. We report the identification of more than 20 potential regulators of CRY-dependent light responses. We demonstrate that one of them, the chromatin-remodeling enzyme KISMET (KIS), is necessary for normal circadian photoresponses, but does not affect the circadian pacemaker. KIS genetically interacts with CRY and functions in PDF-negative circadian neurons, which play an important role in circadian light responses. It also affects daily CRY-dependent TIM oscillations in a peripheral tissue: the eyes. We therefore conclude that KIS is a key transcriptional regulator of genes that function in the CRY signaling cascade, and thus it plays an important role in the synchronization of circadian rhythms with the dayrationight cycle.
Volume 5(12)
Pages e1000787
Published 2009-12-1
DOI 10.1371/journal.pgen.1000787
PMID 20041201
PMC PMC2789323
MeSH Animals Behavior, Animal / radiation effects Circadian Rhythm / genetics* Circadian Rhythm / radiation effects* Cryptochromes / genetics Cryptochromes / metabolism DNA Helicases / genetics* DNA Helicases / metabolism Drosophila Proteins / genetics* Drosophila Proteins / metabolism Drosophila melanogaster / genetics* Drosophila melanogaster / physiology* Drosophila melanogaster / radiation effects Gene Expression Regulation / radiation effects Genes, Insect / genetics Genetic Testing* Homeodomain Proteins / genetics* Homeodomain Proteins / metabolism Light* Neurons / metabolism Neurons / radiation effects Protein Processing, Post-Translational / radiation effects RNA, Double-Stranded / metabolism
IF 5.175
Times Cited 31
Drosophila 3696R-1 3696R-1