Evidence map›Paper›PMID 28007935›Full record

ArticleMolecular systems biology2016

Frequency doubling in the cyanobacterial circadian clock.

Bruno Mc Martins, Arijit K Das, Liliana Antunes, James Cw Locke

Open access · goldAbstract read
In one paragraph

Article in Molecular systems biology, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 18 papers.

0numbers the graph read from it
0cells of the map it votes in
18citing papers in PubMed
2.3field-weighted citation impact, top 12% of its field
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

18 citing papers in PubMed, 35 citations in OpenAlex.

  1. Review
  2. Article
  3. Mutations in the circadian cycle drive adaptive plasticity in cyanobacteria.Proceedings of the National Academy of Sciences of the United States of America · 2025
    Article
  4. Article
  5. Article
  6. Article
  7. Article
  8. Article
  9. Review
  10. Review
  11. Article
  12. Article
  13. Cell size control driven by the circadian clock and environment in cyanobacteria.Proceedings of the National Academy of Sciences of the United States of America · 2018
    Article
  14. Article
  15. Article
  16. Article
  17. Article
  18. 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

4 authors at 1 institution in 1 country.

Bruno Mc MartinsSainsbury Laboratory, University of Cambridge, Cambridge, UK.
Arijit K DasSainsbury Laboratory, University of Cambridge, Cambridge, UK.
Liliana AntunesSainsbury Laboratory, University of Cambridge, Cambridge, UK.
James Cw LockeSainsbury Laboratory, University of Cambridge, Cambridge, UK james.locke@slcu.cam.ac.uk.ORCID http://orcid.org/0000-0003-0670-1943
University of Cambridge · GB

Funding

Biotechnology and Biological Sciences Research Council BB/L014130/1
6 · The paper itself

Abstract

Organisms use circadian clocks to generate 24-h rhythms in gene expression. However, the clock can interact with other pathways to generate shorter period oscillations. It remains unclear how these different frequencies are generated. Here, we examine this problem by studying the coupling of the clock to the alternative sigma factor sigC in the cyanobacterium Synechococcus elongatus Using single-cell microscopy, we find that psbAI, a key photosynthesis gene regulated by both sigC and the clock, is activated with two peaks of gene expression every circadian cycle under constant low light. This two-peak oscillation is dependent on sigC, without which psbAI rhythms revert to one oscillatory peak per day. We also observe two circadian peaks of elongation rate, which are dependent on sigC, suggesting a role for the frequency doubling in modulating growth. We propose that the two-peak rhythm in psbAI expression is generated by an incoherent feedforward loop between the clock, sigC and psbAI Modelling and experiments suggest that this could be a general network motif to allow frequency doubling of outputs.

Indexed as

Circadian ClocksBacterial ProteinsGene Expression Regulation, BacterialModels, BiologicalMolecular ImagingPhotosynthesisPhotosystem II Protein ComplexSigma FactorSingle-Cell AnalysisSynechococcusTime-Lapse ImagingBacterial ProteinsPhotosystem II Protein ComplexSigma Factorcircadian clockcyanobacteriamathematical modellingnetwork motifssingle‐cell time‐lapse microscopy

Identifiers

PMID28007935
PMCPMC5199125
OpenAlexW2562432607

What OpenQuestion holds

Textmetadata
LicenceCC BY
Read underepoch 390

Registered trials

None linked

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.