Cited by 4,379Circadian rhythm and melatoninSleep and Wakefulness ResearchAdvanced Frequency and Time Standards

Coordination of circadian timing in mammals

Reppert, Steven M., Weaver, David R.·2002·Nature

Abstract

Time in the biological sense is measured by cycles that range from milliseconds to years. Circadian rhythms, which measure time on a scale of 24 h, are generated by one of the most ubiquitous and well-studied timing systems. At the core of this timing mechanism is an intricate molecular mechanism that ticks away in many different tissues throughout the body. However, these independent rhythms are tamed by a master clock in the brain, which coordinates tissue-specific rhythms according to light input it receives from the outside world.

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Crossref · 10.1038/nature00965

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  • The 24-h rhythm of cortisol is driven by the central circadian pacemaker located in the suprachiasmatic nucleus, which entrains peripheral clocks throughout the body.

    “The 24-h rhythm of cortisol expressed in humans is driven by the central circadian pacemaker located in the suprachiasmatic nucleus [56, 57], which entrains all other peripheral clocks throughout the body to coordinate bodily processes with the environment [58, 59].”

    From Sleep, testosterone and cortisol balance, and ageing men (2022) · cites this paper as [58]

  • The central circadian clock in the SCN synchronizes peripheral clocks in liver, gut, pancreas, and adipose tissue via neural and hormonal pathways.

    “In normal physiology, the central circadian clock, located in the hypothalamic suprachiasmatic nuclei (SCN), synchronizes the timing of peripheral clocks in the liver, gut, pancreas, and adipose tissue via multiple neural and hormonal pathways (1).”
  • Circadian rhythms are near-24-hour oscillations found in essentially every physiological process in the human brain and body.

    “Circadian rhythms are near-24-hour oscillations found in essentially every physiological process in the human brain and body1.”
  • Molecular rhythms in individual cells are generated by a transcriptional-translational feedback loop involving CLOCK, NPAS2 and BMAL1, which regulate expression of genes including PER and CRY, and these translated products inhibit their own transcription.

    “In individual cells, molecular rhythms are generated by a transcriptional–translational feedback loop involving core transcriptional activators — circadian locomotor output cycles kaput (CLOCK), the closely related neuronal PAS domain protein 2 (NPAS2) and brain and muscle ARNT-like protein 1 (BMAL1) — that regulate the expression of many genes, including those encoding period (PER) and cryptochr”
  • The circadian rhythm of the HPA axis is orchestrated by the suprachiasmatic nucleus.

    “The circadian rhythm of the HPA axis is orchestrated by the suprachiasmatic nucleus (SCN) of the hypothalamus (9) and the oscillating release of GCs is believed to optimize stress responses.”

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Authors
Reppert, S. M., & Weaver, D. R.
Affiliations
University of Massachusetts Chan Medical School (US)
Corresponding author
Reppert, Steven M.
Venue
Nature
Published
2002-08
Volume
418
Issue
6901
Pages
935-941
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W2003302378
Cited by
4,379
References
83
Citations by year
2026: 139 · 2025: 152 · 2024: 162 · 2023: 193 · 2022: 198 · 2021: 182 · 2020: 197 · 2019: 162 · 2018: 172 · 2017: 210 · 2016: 196 · 2015: 204 · 2014: 216 · 2013: 212 · 2012: 218
FWCI
14.96
Type
journal article
Language
en
Open access
closed
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
  • eScholarship@UMassChan (submittedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
Funders
National Institutes of Health
Topics
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Sleep and Wakefulness Research
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Advanced Frequency and Time Standards
Keywords
circadian rhythm, circadian clock, circadian pacemaker, suprachiasmatic nucleus, light input, molecular clock mechanisms, biological timing, mammals
MeSH terms
Animals, Circadian Rhythm, Gene Expression Regulation, Light, Mammals, Models, Biological, Phosphorylation, Suprachiasmatic Nucleus, Visual Pathways, Photoreceptor Cells, Vertebrate, Active Transport, Cell Nucleus, Feedback, Physiological

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