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Circadian Rhythms and Gene Regulation02:19

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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...
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The circadian—or biological—clock is an intrinsic, timekeeping, molecular mechanism that allows plants to coordinate physiological activities over 24-hour cycles called circadian rhythms. Photoperiodism is a collective term for the biological responses of plants to variations in the relative lengths of dark and light periods. The period of light-exposure is called the photoperiod.
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Related Experiment Video

Updated: Mar 17, 2026

Parallel Measurement of Circadian Clock Gene Expression and Hormone Secretion in Human Primary Cell Cultures
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Environmental 24-hr Cycles Are Essential for Health.

Eliane A Lucassen1, Claudia P Coomans1, Maaike van Putten2

  • 1Laboratory for Neurophysiology, Department of Molecular Cell Biology, Leiden University Medical Center, 2333 ZC Leiden, the Netherlands.

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This summary is machine-generated.

Disrupting circadian rhythms with artificial light harms health, reducing muscle and bone function. Fortunately, these negative effects are reversible once normal light-dark cycles resume.

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Area of Science:

  • Chronobiology
  • Physiology
  • Molecular Biology

Background:

  • Circadian rhythms are fundamental biological processes essential for organismal health.
  • Modern society's pervasive artificial lighting disrupts natural light-dark cycles, potentially leading to adverse health outcomes.
  • The suprachiasmatic nucleus (SCN) acts as the central circadian pacemaker in mammals.

Purpose of the Study:

  • To investigate the health consequences of disrupting circadian rhythmicity.
  • To determine the impact of long-term exposure to continuous light (LL) on physiological parameters in mice.
  • To assess the reversibility of LL-induced health effects.

Main Methods:

  • Mice were exposed to continuous light (LL) for 24 weeks.
  • Neuronal activity in the suprachiasmatic nucleus (SCN) was recorded.
  • Skeletal muscle function (grip strength, hanging duration) and bone health were assessed.
  • Pro-inflammatory markers were measured.
  • Recovery was studied after returning mice to a standard light-dark cycle.

Main Results:

  • Twenty-four weeks of LL significantly reduced SCN rhythmicity by 70%.
  • LL exposure impaired skeletal muscle function and caused trabecular bone deterioration.
  • A transient pro-inflammatory state was observed during LL exposure.
  • Upon return to a light-dark cycle, SCN rhythmicity and all measured health parameters rapidly recovered.

Conclusions:

  • Disruption of circadian rhythms, even for extended periods, induces reversible detrimental effects on multiple physiological systems.
  • The study highlights the critical role of natural light-dark cycles in maintaining organismal health.
  • These findings underscore the potential health risks associated with artificial light at night and circadian disruption.