Molecular mechanism of suppression of circadian rhythms by a critical stimulus

Guocun Huang, Lixin Wang, Yi Liu

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Circadian singularity behavior (also called suppression of circadian rhythms) is a phenomenon characterized by the abolishment of circadian rhythmicities by a critical stimulus. Here we demonstrate that both temperature step up and light pulse, stimuli that activate the expression of the Neurospora circadian clock gene frequency (frq), can trigger singularity behavior in this organism. The arrhythmicity is transient and is followed by the resumption of rhythm in randomly distributed phases. In addition, we show that induction of FRQ expression alone can trigger singularity behavior, indicating that FRQ is a state variable of the Neurospora circadian oscillator. Furthermore, mutations of frq lead to changes in the amplitude of FRQ oscillation, which determines the sensitivity of the clock to phase-resetting cues. Our results further suggest that the singularity behavior is due to the loss of rhythm in all cells. Together, these data suggest that the singularity behavior is due to a circadian negative feedback loop driven to a steady state after the critical treatment. After the initial arrhythmicity, cell populations are then desynchronized.

Original languageEnglish (US)
Pages (from-to)5349-5357
Number of pages9
JournalEMBO Journal
Volume25
Issue number22
DOIs
StatePublished - Nov 15 2006

Fingerprint

Circadian Rhythm
Clocks
Neurospora
Genes
Cells
Feedback
Circadian Clocks
Periodicity
Mutation Rate
Gene Frequency
Cues
Temperature
Light
Population

Keywords

  • Entrainment
  • Feedback loop
  • Frequency
  • Singularity
  • Temperature

ASJC Scopus subject areas

  • Genetics
  • Cell Biology

Cite this

Molecular mechanism of suppression of circadian rhythms by a critical stimulus. / Huang, Guocun; Wang, Lixin; Liu, Yi.

In: EMBO Journal, Vol. 25, No. 22, 15.11.2006, p. 5349-5357.

Research output: Contribution to journalArticle

Huang, Guocun ; Wang, Lixin ; Liu, Yi. / Molecular mechanism of suppression of circadian rhythms by a critical stimulus. In: EMBO Journal. 2006 ; Vol. 25, No. 22. pp. 5349-5357.
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