title: PERIOD1-associated proteins modulate the negative limb of the mammalian circadian oscillator.
abstract: The clock proteins PERIOD1 (PER1) and PERIOD2 (PER2) play essential roles in a negative transcriptional feedback loop that generates circadian rhythms in mammalian cells. We identified two PER1-associated factors, NONO and WDR5, that modulate PER activity. The reduction of NONO expression by RNA interference (RNAi) attenuated circadian rhythms in mammalian cells, and fruit flies carrying a hypomorphic allele were nearly arrhythmic. WDR5, a subunit of histone methyltransferase complexes, augmented PER-mediated transcriptional repression, and its reduction by RNAi diminished circadian histone methylations at the promoter of a clock gene.
authors.affiliation: Department of Molecular Biology and National Centres of Competence in Research (NCCR) Frontiers in Genetics, Sciences III, University of Geneva, 30 Quai Ernest Ansermet, CH-1211 Geneva-4, Switzerland. steven.brown@molbio.unige.ch
authors.forename: Steven A
authors.initials: SA
authors.lastname: Brown
authors.forename: Juergen
authors.initials: J
authors.lastname: Ripperger
authors.forename: Sebastian
authors.initials: S
authors.lastname: Kadener
authors.forename: Fabienne
authors.initials: F
authors.lastname: Fleury-Olela
authors.forename: Francis
authors.initials: F
authors.lastname: Vilbois
authors.forename: Michael
authors.initials: M
authors.lastname: Rosbash
authors.forename: Ueli
authors.initials: U
authors.lastname: Schibler
mesh_terms: D016475:3T3 Cells; D000818:Animals; D002352:Carrier Proteins / Q000235:genetics / Q000378:metabolism*; D018797:Cell Cycle Proteins; D002460:Cell Line; D002940:Circadian Rhythm; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism; D004330:Drosophila / Q000235:genetics / Q000502:physiology; D029721:Drosophila Proteins / Q000235:genetics / Q000502:physiology; D005260:Female; D005786:Gene Expression Regulation; D006657:Histones / Q000378:metabolism; D047468:Immunoprecipitation; D047908:Intracellular Signaling Peptides and Proteins; D008297:Male; D008745:Methylation; D051379:Mice; D008807:Mice, Inbred BALB C; D009687:Nuclear Proteins / Q000235:genetics / Q000378:metabolism* / Q000502:physiology; D056953:Nuclear Receptor Subfamily 1, Group D, Member 1; D056950:Period Circadian Proteins; D011401:Promoter Regions, Genetic; D011506:Proteins / Q000235:genetics / Q000378:metabolism*; D034622:RNA Interference; D016601:RNA-Binding Proteins; D051381:Rats; D018160:Receptors, Cytoplasmic and Nuclear / Q000235:genetics / Q000378:metabolism; D014157:Transcription Factors; D014158:Transcription, Genetic; D014162:Transfection
chemical_list: D002352:Carrier Proteins; D018797:Cell Cycle Proteins; D004268:DNA-Binding Proteins; D029721:Drosophila Proteins; D006657:Histones; D047908:Intracellular Signaling Peptides and Proteins; C070174:NONA protein, Drosophila; C500331:Nono protein, mouse; C498262:Nr1d1 protein, mouse; C498263:Nr1d1 protein, rat; D009687:Nuclear Proteins; D056953:Nuclear Receptor Subfamily 1, Group D, Member 1; C539023:Per1 protein, mouse; C539024:Per1 protein, rat; C513312:Per2 protein, mouse; C513311:Per2 protein, rat; D056950:Period Circadian Proteins; D011506:Proteins; D016601:RNA-Binding Proteins; D018160:Receptors, Cytoplasmic and Nuclear; D014157:Transcription Factors; C443118:Wdr5 protein, mouse