Evidence map›Paper›PMID 29219034›Full record

ArticleJournal of biological rhythms2018

Measuring Relative Coupling Strength in Circadian Systems.

Christoph Schmal, Erik D Herzog, Hanspeter Herzel

Abstract read
In one paragraph

Article in Journal of biological rhythms, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 30 papers.

0numbers the graph read from it
0cells of the map it votes in
30citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

30 citing papers in PubMed.

  1. Review
  2. Reconsidering mammalian circadian organization.Neurobiology of sleep and circadian rhythms · 2026
    Article
  3. Review
  4. Article
  5. Article
  6. Liver as a nexus of daily metabolic cross talk.International review of cell and molecular biology · 2025
    Review
  7. Article
  8. The seasons within: a theoretical perspective on photoperiodic entrainment and encoding.Journal of comparative physiology. A, Neuroethology, sensory, neural, and behavioral physiology · 2024
    Review
  9. Timed receptor tyrosine kinase signaling couples the central and a peripheral circadian clock inProceedings of the National Academy of Sciences of the United States of America · 2024
    Article
  10. Article
  11. Article
  12. The circadian clock of the bacteriumScience advances · 2023
    Article
  13. Article
  14. Article
  15. Article
  16. Article
  17. The Effects of Light and the Circadian System on Rhythmic Brain Function.International journal of molecular sciences · 2022
    Review
  18. Mathematical Modeling in Circadian Rhythmicity.Methods in molecular biology (Clifton, N.J.) · 2022
    Article
  19. Review
  20. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

3 authors.

Christoph SchmalInstitute for Theoretical Biology, Charité-Universitätsmedizin, Berlin, Germany.
Erik D HerzogDepartment of Biology, Washington University in St. Louis, St. Louis, MO, USA.
Hanspeter HerzelInstitute for Theoretical Biology, Humboldt Universität zu Berlin, Berlin, Germany.

Funding

CRCNS: The balance between robustness and sensitivity in circadian synchronyR01NS095367 · NINDS · WASHINGTON UNIVERSITY · PI HERZOG, ERIK · 2015 to 2017
$566k
NINDS NIH HHS R01 NS095367
6 · The paper itself

Abstract

Modern imaging techniques allow the monitoring of circadian rhythms of single cells. Coupling between these single cellular circadian oscillators can generate coherent periodic signals on the tissue level that subsequently orchestrate physiological outputs. The strength of coupling in such systems of oscillators is often unclear. In particular, effects on coupling strength by varying cell densities, by knockouts, and by inhibitor applications are debated. In this study, we suggest to quantify the relative coupling strength via analyzing period, phase, and amplitude distributions in ensembles of individual circadian oscillators. Simulations of different oscillator networks show that period and phase distributions become narrower with increasing coupling strength. Moreover, amplitudes can increase due to resonance effects. Variances of periods and phases decay monotonically with coupling strength, and can serve therefore as measures of relative coupling strength. Our theoretical predictions are confirmed by studying recently published experimental data from PERIOD2 expression in slices of the suprachiasmatic nucleus during and after the application of tetrodotoxin (TTX). On analyzing the corresponding period, phase, and amplitude distributions, we can show that treatment with TTX can be associated with a reduced coupling strength in the system of coupled oscillators. Analysis of an oscillator network derived directly from the data confirms our conclusions. We suggest that our approach is also applicable to quantify coupling in fibroblast cultures and hepatocyte networks, and for social synchronization of circadian rhythmicity in rodents, flies, and bees.

Indexed as

AnimalsBiological ClocksCircadian RhythmPeriod Circadian ProteinsSuprachiasmatic NucleusTetrodotoxinPeriod Circadian ProteinsTetrodotoxincircadian clockcouplingoscillatorsuprachiasmatic nucleussynchronization

Identifiers

PMID29219034
PMCPMC6344889

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.