Circadian activity rhythms in high-alcohol-preferring and low-alcohol-preferring mice.

The circadian periods of high-alcohol-preferring (HAP) and low-alcohol-preferring (LAP) selected lines of mice were compared. The mice were ethanol-naive. Circadian periods were calculated from records of running-wheel activity in constant dark. The number of daily wheel revolutions and body weights of the two lines of mice were also compared. The HAP line had a shorter period of wheel running than that of the LAP lines. The HAP mice also had a tendency to run more on wheels than did LAP mice. These findings support the suggestion that genes affecting ethanol consumption in mice have pleiotropic effects on circadian period.

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