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Cycle of period Gene Expression in a Diurnal Mammal (Spermophilus tridecemlineatus): Implications for Nonphotic Phase Shifting

Department of Zoology, Psychology, and Physiology, University of Toronto, Toronto, Ontario, M5S 3G5 Canada; mro{at}zoo.utoronto.ca

K. Edelstein

Departments of Zoology, University of Toronto, Toronto, Ontario, M5S 3G5 Canada

M. H. Hastings

Department of Anatomy, University of Cambridge, Cambridge, CB2 3DY, United Kingdom

E. S. Maywood

Department of Anatomy, University of Cambridge, Cambridge, CB2 3DY, United Kingdom

Ground squirrels, Spermophilus tridecemlineatus, were kept in a 12:12 h light-dark cycle. As expected for a diurnal species, their locomotor activity occurred almost entirely in the daytime. Expression of mPer1 and mPer2 in the suprachiasmatic nucleus was studied at six time points by in situ hybridization. For both these genes, mRNA was highest in the first part of the subjective day (about zeitgeber time 5). This is close to the time when mPer1 and mPer2 expression is maximal in nocturnal rodents. These results have implications for under- standing nonphotic phase response curves in diurnal species and thereby for guiding research on nonphotic phase shifting in people

Key Words: circadian rhythms • diurnal mammals • ground squirrels • mPer • nonphotic entrainment • suprachiasmatic nucleus

Journal of Biological Rhythms, Vol. 16, No. 5, 471-478 (2001)
DOI: 10.1177/074873001129002141


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