Forward-genetics analysis of sleep in randomly mutagenized mice

Hiromasa Funato, Chika Miyoshi, Tomoyuki Fujiyama, Takeshi Kanda, Makito Sato, Zhiqiang Wang, Jing Ma, Shin Nakane, Jun Tomita, Aya Ikkyu, Miyo Kakizaki, Noriko Hotta-Hirashima, Satomi Kanno, Haruna Komiya, Fuyuki Asano, Takato Honda, Staci J. Kim, Kanako Harano, Hiroki Muramoto, Toshiya YonezawaSeiya Mizuno, Shinichi Miyazaki, Linzi Connor, Vivek Kumar, Ikuo Miura, Tomohiro Suzuki, Atsushi Watanabe, Manabu Abe, Fumihiro Sugiyama, Satoru Takahashi, Kenji Sakimura, Yu Hayashi, Qinghua Liu, Kazuhiko Kume, Shigeharu Wakana, Joseph S Takahashi, Masashi Yanagisawa

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Abstract

Sleep is conserved from invertebrates to vertebrates, and is tightly regulated in a homeostatic manner. The molecular and cellular mechanisms that determine the amount of rapid eye movement sleep (REMS) and non-REMS (NREMS) remain unknown. Here we identify two dominant mutations that affect sleep and wakefulness by using an electroencephalogram/electromyogram-based screen of randomly mutagenized mice. A splicing mutation in the Sik3 protein kinase gene causes a profound decrease in total wake time, owing to an increase in inherent sleep need. Sleep deprivation affects phosphorylation of regulatory sites on the kinase, suggesting a role for SIK3 in the homeostatic regulation of sleep amount. Sik3 orthologues also regulate sleep in fruitflies and roundworms. A missense, gain-of-function mutation in the sodium leak channel NALCN reduces the total amount and episode duration of REMS, apparently by increasing the excitability of REMS-inhibiting neurons. Our results substantiate the use of a forward-genetics approach for studying sleep behaviours in mice, and demonstrate the role of SIK3 and NALCN in regulating the amount of NREMS and REMS, respectively.

Original languageEnglish (US)
Pages (from-to)378-383
Number of pages6
JournalNature
Volume539
Issue number7629
DOIs
Publication statusPublished - 2016

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ASJC Scopus subject areas

  • Medicine(all)
  • General

Cite this

Funato, H., Miyoshi, C., Fujiyama, T., Kanda, T., Sato, M., Wang, Z., ... Yanagisawa, M. (2016). Forward-genetics analysis of sleep in randomly mutagenized mice. Nature, 539(7629), 378-383. https://doi.org/10.1038/nature20142