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The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent years,...
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Related Experiment Video

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Monitoring Cell-autonomous Circadian Clock Rhythms of Gene Expression Using Luciferase Bioluminescence Reporters
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Circadian rhythms: basic neurobiology and clinical applications

R Y Moore1

  • 1Department of Psychiatry, University of Pittsburgh, Pennsylvania 15621, USA.

Annual Review of Medicine
|January 1, 1997
PubMed
Summary

Mammals possess a circadian timing system that regulates daily rhythms. This system, involving the retinohypothalamic tract and suprachiasmatic nuclei, influences sleep, hormones, and performance, with melatonin showing therapeutic potential for timing disorders.

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Area of Science:

  • Chronobiology
  • Neuroscience
  • Physiology

Background:

  • Circadian rhythms are fundamental biological processes for environmental adaptation in mammals.
  • These rhythms are orchestrated by a complex circadian timing system.

Purpose of the Study:

  • To elucidate the components and functions of the mammalian circadian timing system.
  • To identify the primary pathways involved in circadian rhythm regulation.
  • To explore the implications of circadian timing disorders and potential therapeutic interventions.

Main Methods:

  • The study reviews the anatomical and functional organization of the circadian timing system.
  • It details the retinohypothalamic tract as the main input pathway.
  • It describes the suprachiasmatic nuclei as central circadian pacemakers and their output pathways.

Main Results:

  • The circadian timing system comprises input pathways, pacemakers (suprachiasmatic nuclei), and output pathways.
  • The retinohypothalamic tract relays environmental light information to the suprachiasmatic nuclei.
  • Suprachiasmatic nuclei outputs temporally organize sleep-wake cycles, physiological functions, and psychomotor performance.

Conclusions:

  • Disruptions in circadian timing primarily impact input and pacemaker functions.
  • Melatonin, a pineal hormone, is a potential therapeutic agent for certain circadian timing disorders.