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The mammalian circadian clock.

Urs Albrecht1, Gregor Eichele

  • 1Institute of Biochemistry, University of Fribourg, Rue du Museé 5, 1700 Fribourg, Switzerland. urs.albrecht@unifr.ch

Current Opinion in Genetics & Development
|June 6, 2003
PubMed
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Organisms have internal biological clocks, called circadian timing systems, that synchronize bodily functions with daily environmental cycles like light and dark. The brain's master clock orchestrates these numerous clocks for coordinated responses.

Area of Science:

  • Chronobiology
  • Molecular Biology
  • Neuroscience

Background:

  • Life on Earth is influenced by daily and seasonal environmental changes, primarily the light-dark cycle.
  • Organisms have evolved endogenous circadian timing systems to synchronize biological functions with these environmental rhythms.
  • Mammalian circadian systems comprise multiple tissue-specific clocks orchestrated by a master pacemaker in the brain's suprachiasmatic nuclei.

Purpose of the Study:

  • To understand the molecular and cellular mechanisms underlying mammalian circadian clocks.
  • To elucidate how individual clocks are synchronized to form a coherent physiological and behavioral response.

Main Methods:

  • Genetic approaches
  • Biochemical analyses
  • Genomic studies

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Main Results:

  • Significant advances have been made in identifying key components of the mammalian circadian clock.
  • The molecular and cellular basis of circadian clock mechanisms is increasingly understood.
  • The orchestration of multiple tissue-specific clocks by the master pacemaker has been investigated.

Conclusions:

  • Mammalian circadian timing systems are complex, involving numerous interacting components.
  • Understanding these systems is crucial for comprehending physiological and behavioral adaptations to environmental cycles.
  • Continued research using genetic, biochemical, and genomic methods promises further insights into circadian clock function.