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Science 7 August 1998:
Vol. 281. no. 5378, pp. 825 - 829
DOI: 10.1126/science.281.5378.825
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Reports

How Temperature Changes Reset a Circadian Oscillator

Yi Liu, Martha Merrow, * Jennifer J. Loros, Jay C. Dunlap dagger

Circadian rhythms control many physiological activities. The environmental entrainment of rhythms involves the immediate responses of clock components. Levels of the clock protein FRQ were measured in Neurospora at various temperatures; at higher temperatures, the amount of FRQ oscillated around higher levels. Absolute FRQ amounts thus identified different times at different temperatures, so temperature shifts corresponded to shifts in clock time without immediate synthesis or turnover of components. Moderate temperature changes could dominate light-to-dark shifts in the influence of circadian timing. Temperature regulation of clock components could explain temperature resetting of rhythms and how single transitions can initiate rhythmicity from characteristic circadian phases.

Department of Biochemistry, Dartmouth Medical School, Hanover, NH 03755-3844, USA.
*   Present address: Institut für Medizinische Psychologie, Goethestrasse 31, D-80336 Munich, Germany.

dagger    To whom correspondence should be addressed. E-mail: jay.c.dunlap{at}dartmouth.edu

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