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Animal Bioresource in Japan

.: Home > Animal Bioresource in Japan > 2014 > Volume 63 Number 2 > Hideyuki HIYOSHI, Akira TERAO, Yuko OKAMATSU-OGURA, Kazuhiro KIMURA

Characteristics of Sleep and Wakefulness inWild-Derived Inbred Mice

Laboratory of Biochemistry, Department of Biomedical Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Kita-18, Nishi-9, Kita-ku, Sapporo, Hokkaido 060-0818, Japan
Abstract :

Genetic variations in the wild-derived inbred mouse strains are more diverse than that of classical laboratory inbred mouse strains, including C57BL/6J (B6). The sleep/wake and monoamine properties of six wild-derived inbred mouse strains (PGN2, NJL, BLG2, KJR, MSM, HMI) were characterized and compared with those of B6 mice. All examined mice were nocturnal and had a polyphasic sleep pattern with a “main sleep period” identified during the light period. However, there were three sleep/wake phenotypic differences between the wild-derived mouse strains and B6 strain. First, the amount of sleep during the dark phase was comparable with that of B6 mice. However, the amount of sleep during the light phase was more varied among strains, in particular, NJL and HMI had significantly less sleep compared with that of B6 mice. Second, PGN2, NJL, BLG2, and KJR mice showed a “highly awake period” (in which the hourly total sleep time was <10%) immediately after the onset of the dark period, which was not seen in B6 mice. Third, relative to that of B6 mice, PGN2 and KJR mice showed longer duration of wakefulness episodes during the 12-h dark phase. Differences in whole brain noradrenaline, dopamine, and 5-hydroxy-tryptamine contents between the wild-derived mouse strains and B6 strain were also found. These identified phenotypes might be potentially under strong genetic control. Hence, wild-derived inbred mice could be useful for identifying the genetic factors underlying the regulation of sleep and wakefulness.

Keywords :
dopamine, 5-hydroxy-tryptamine, noradrenaline, sleep, wakefulness

Date Deposited : 07 Apr 2015 10:08

Last Modified : 07 Apr 2015 10:08

Official URL: http://

Volume 63, Number 2, - 2014

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