Period coding of Bmal1 oscillators in the suprachiasmatic nucleus

J. Myung, S. Hong, F. Hatanaka, Y. Nakajima, E. De Schutter, T. Takumi

Research output: Contribution to journalArticlepeer-review

53 Citations (Scopus)


Circadian oscillators in the suprachiasmatic nucleus (SCN) collectively orchestrate 24 h rhythms in the body while also coding for seasonal rhythms. Although synchronization is required among SCN oscillators to provide robustness for regular timekeeping (Herzog et al., 2004), heterogeneity of period and phase distributions is needed to accommodate seasonal variations in light duration (Pittendrigh and Daan, 1976b). In the mouse SCN, the heterogeneous phase distribution has been recently found in the cycling of clock genes Period 1 and Period 2 (Per1, Per2) and has been shown to reorganize by relative day lengths (Inagaki et al., 2007). However, it is not yet clearly understood what underlies the spatial patterning of Per1 and Per2 expression (Yamaguchi et al., 2003; Foley et al., 2011) and its plasticity. We found that the period of the oscillation in Bmal1 expression, a positive-feedback component of the circadian clock, preserves the behavioral circadian period under culture and drives clustered oscillations in the mouse SCN. Pharmacological and physical isolations of SCN subregions indicate that the period of Bmal1 oscillation is subregion specific and is preserved during culture. Together with computer simulations, we show that either the intercellular coupling does not strongly influence the Bmal1 oscillation or the nature of the coupling is more complex than previously assumed. Furthermore, we have found that the region-specific periods are modulated by the light conditions that an animal is exposed to. Based on these, we suggest that the period forms the basis of seasonal coding in the SCN. © 2012 the authors.
Original languageEnglish
Pages (from-to)8900-8918
Number of pages19
JournalJournal of Neuroscience
Issue number26
Publication statusPublished - 2012
Externally publishedYes


  • PER2 protein
  • protein BMAL1
  • animal experiment
  • animal tissue
  • article
  • bioluminescence
  • circadian rhythm
  • computer simulation
  • female
  • immunofluorescence
  • immunohistochemistry
  • light dark cycle
  • locomotion
  • male
  • mouse
  • nonbiological model
  • nonhuman
  • plasticity
  • priority journal
  • protein expression
  • suprachiasmatic nucleus
  • transgenic mouse
  • Action Potentials
  • Animals
  • ARNTL Transcription Factors
  • Biological Clocks
  • Brain Mapping
  • Circadian Rhythm
  • Cluster Analysis
  • GABA Antagonists
  • Gene Expression Regulation
  • Luminescent Proteins
  • Mice
  • Mice, Inbred C57BL
  • Mice, Transgenic
  • Models, Neurological
  • Motor Activity
  • Neurons
  • Nonlinear Dynamics
  • Organ Culture Techniques
  • Period Circadian Proteins
  • Photoperiod
  • Pyridazines
  • Sodium Channel Blockers
  • Software
  • Statistics as Topic
  • Suprachiasmatic Nucleus
  • Tetrodotoxin


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