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Disturbed clockwork resetting in Sharp-1 and Sharp-2 single and double mutant mice.

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Area of Science:

  • Chronobiology
  • Molecular Biology
  • Genetics

Background:

  • The circadian system regulates homeostasis and anticipates daily environmental changes.
  • Circadian disruption is linked to various health issues, including sleep, metabolic, and psychiatric disorders.
  • Molecular mechanisms underlying tissue-specific clock desynchronization remain incompletely understood.

Purpose of the Study:

  • To investigate the in vivo function of basic Helix-Loop-Helix (bHLH) transcription factors SHARP-1 and SHARP-2 in regulating the molecular clock.
  • To elucidate the roles of SHARP-1 and SHARP-2 in controlling circadian period length, gene expression, and entrainment to external cues.
  • To explore the complementary functions of SHARP-1 and SHARP-2 in activity phase resetting kinetics during experimental jet lag.

Main Methods:

  • Generation of Sharp-1 and Sharp-2 single and double mutant mice.
  • Analysis of circadian expression patterns and cell culture experiments.
  • Light-pulse experiments and rapid delays of the light-dark cycle to simulate jet lag.

Main Results:

  • SHARP-1 and SHARP-2 play critical roles in regulating circadian period length and tissue-specific clock gene expression.
  • These factors exhibit complementary functions in controlling activity phase resetting kinetics following simulated jet lag.
  • SHARP-1 and SHARP-2 function as context-dependent repressors and co-activators of mammalian clock gene expression, impacting Per2 expression amplitudes differently across brain regions and tissues.

Conclusions:

  • The study provides new mechanistic insights into the complex processes of circadian clock synchronization.
  • Differential effects of SHARP deficiency on rhythmicity and re-entrainment highlight distinct regulatory mechanisms for phase, amplitude, and period.
  • Tissue-dependent regulatory functions of SHARP-1 and SHARP-2 offer a basis for understanding clock synchronization disruptions.