MPer1 and mper2 are essential for normal resetting of the circadian clock.
Mammalian Per1 and Per2 genes are involved in the mechanism of the circadian clock and are inducible by light. A light pulse can evoke a change in the onset of wheel-running activity in mice by shifting the onset of activity to earlier times (phase advance) or later times (phase delays) thereby advancing or delaying the clock (clock resetting). To assess the role of mouse Per (mPer) genes in circadian clock resetting, mice carrying mutant mPer1 or mPer2 genes were tested for responses to a light pulse at ZT 14 and ZT 22, respectively. The authors found that mPer1 mutants did not advance and mPer2 mutants did not delay the clock. They conclude that the mammalian Per genes are not only light-responsive components of the circadian oscillator but also are involved in resetting of the circadian clock.
Albrecht
U
U
Max-Planck-Institute for Experimental Endocrinology, Hannover, Germany. urs.albrecht@mpihan.mpg.de
Zheng
B
B
Larkin
D
D
Sun
Z S
ZS
Lee
C C
CC
D000818:Animals; D018797:Cell Cycle Proteins; D002940:Circadian Rhythm / Q000235:genetics*; D005091:Exons / Q000235:genetics; D051379:Mice; D008810:Mice, Inbred C57BL; D009154:Mutation / Q000502:physiology; D009687:Nuclear Proteins / Q000235:genetics*; D056950:Period Circadian Proteins; D010775:Photic Stimulation; D014157:Transcription Factors
D018797:Cell Cycle Proteins; D009687:Nuclear Proteins; C539023:Per1 protein, mouse; C513312:Per2 protein, mouse; D056950:Period Circadian Proteins; D014157:Transcription Factors