title: Sleep deprivation effects on circadian clock gene expression in the cerebral cortex parallel electroencephalographic differences among mouse strains.
abstract: Sleep deprivation (SD) results in increased electroencephalographic (EEG) delta power during subsequent non-rapid eye movement sleep (NREMS) and is associated with changes in the expression of circadian clock-related genes in the cerebral cortex. The increase of NREMS delta power as a function of previous wake duration varies among inbred mouse strains. We sought to determine whether SD-dependent changes in circadian clock gene expression parallel this strain difference described previously at the EEG level. The effects of enforced wakefulness of incremental durations of up to 6 h on the expression of circadian clock genes (bmal1, clock, cry1, cry2, csnk1epsilon, npas2, per1, and per2) were assessed in AKR/J, C57BL/6J, and DBA/2J mice, three strains that exhibit distinct EEG responses to SD. Cortical expression of clock genes subsequent to SD was proportional to the increase in delta power that occurs in inbred strains: the strain that exhibits the most robust EEG response to SD (AKR/J) exhibited dramatic increases in expression of bmal1, clock, cry2, csnkIepsilon, and npas2, whereas the strain with the least robust response to SD (DBA/2) exhibited either no change or a decrease in expression of these genes and cry1. The effect of SD on circadian clock gene expression was maintained in mice in which both of the cryptochrome genes were genetically inactivated. cry1 and cry2 appear to be redundant in sleep regulation as elimination of either of these genes did not result in a significant deficit in sleep homeostasis. These data demonstrate transcriptional regulatory correlates to previously described strain differences at the EEG level and raise the possibility that genetic differences underlying circadian clock gene expression may drive the EEG differences among these strains.
authors.affiliation: Biosciences Division, SRI International, Menlo Park, California 94025, USA. jonathan.wisor@sri.com
authors.forename: Jonathan P
authors.initials: JP
authors.lastname: Wisor
authors.forename: Ravi K
authors.initials: RK
authors.lastname: Pasumarthi
authors.forename: Dmitry
authors.initials: D
authors.lastname: Gerashchenko
authors.forename: Carol L
authors.initials: CL
authors.lastname: Thompson
authors.forename: Sayan
authors.initials: S
authors.lastname: Pathak
authors.forename: Aziz
authors.initials: A
authors.lastname: Sancar
authors.forename: Paul
authors.initials: P
authors.lastname: Franken
authors.forename: Ed S
authors.initials: ES
authors.lastname: Lein
authors.forename: Thomas S
authors.initials: TS
authors.lastname: Kilduff
mesh_terms: D000513:Alpha Rhythm; D000704:Analysis of Variance; D000818:Animals; D056926:CLOCK Proteins; D018797:Cell Cycle Proteins / Q000235:genetics / Q000378:metabolism; D002540:Cerebral Cortex / Q000502:physiology*; D002940:Circadian Rhythm / Q000235:genetics*; D056931:Cryptochromes; D005420:Flavoproteins / Q000235:genetics / Q000378:metabolism; D005786:Gene Expression Regulation / Q000502:physiology*; D051379:Mice; D008815:Mice, Inbred Strains; D018345:Mice, Knockout; D009687:Nuclear Proteins / Q000235:genetics / Q000378:metabolism; D056950:Period Circadian Proteins; D012892:Sleep Deprivation / Q000378:metabolism*; D013045:Species Specificity; D015534:Trans-Activators / Q000235:genetics / Q000378:metabolism; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism
chemical_list: D018797:Cell Cycle Proteins; C538964:Cry1 protein, mouse; C538967:Cry2 protein, mouse; D056931:Cryptochromes; D005420:Flavoproteins; D009687:Nuclear Proteins; C539023:Per1 protein, mouse; C513312:Per2 protein, mouse; D056950:Period Circadian Proteins; D015534:Trans-Activators; D014157:Transcription Factors; D056926:CLOCK Proteins; C538944:Clock protein, mouse