Abstract
Single-cell circadian oscillators exchange extracellular information to sustain coherent circadian rhythms at the tissue level. The circadian clock and the cell cycle couple within cells but the mechanisms underlying this interplay are poorly understood. We show that the loss of extracellular circadian synchronization disrupts circadian and cell cycle coordination within individual cells, impeding collective tissue growth. We use the theory of coupled oscillators combined with live population, and single-cell recordings and precise experimental perturbations. Coherent circadian rhythms yield oscillatory growth patterns, which unveil a global timing regulator of tissue dynamics. Knocking out core circadian elements abolishes the observed effects, highlighting the central role of circadian clock regulation. Our results underscore the role of tissue-level circadian disruption in regulating proliferation, thereby linking disrupted circadian clocks with oncogenic processes. These findings illuminate the intricate interplay between circadian rhythms, cellular signalling and tissue physiology and enhance our understanding of tissue homeostasis and growth regulation in the context of both health and disease.
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Data availability
All the data generated and used for this investigation are available via Figshare at https://doi.org/10.6084/m9.figshare.28375358.v1 (ref. 66).
Code availability
The code used in this study can be found at https://github.com/Granada-Lab/Circadian-clock-cell-cycle and https://github.com/Granada-Lab/Automatic-single-cell-tracking-of-fading-objects. We used Python v.3.8.8. and the following packages: Seaborn (v.0.11.2), Matplotlib (v.3.6.3), NumPy (v.1.23.3), pandas (v.1.4.4), SciPy (v.1.9.1), Skimage (v.0.20.0) and pyBOAT (v.0.9.1).
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Acknowledgements
We would like to extend our gratitude to H.-Y. Liou for his invaluable assistance in the establishment of the automatic tracking pipeline with ilastik. We thank the AMBIO imaging facility of the Charité Berlin for support in the acquisition of real-time fluorescence data. This work was financially supported by the German Federal Ministry for Education and Research through the e:Med Juniorverbund DeepLTNBC TP 3 - 01ZX1917C programme. M.S.N. and M.H.J. acknowledge support from the Independent Research Fund Denmark (Grant No. 9040-00116B) and the Novo Nordisk Foundation (Grant No. NNF20OC0064978). M.S.H. acknowledges support from the Lundbeck Foundation. C.E. is thankful for the support of the Berlin School of Integrative Oncology.
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N.G. and A.E.G. were responsible for conceptualization and investigation. N.G., M.S.N. and A.E.G. were responsible for developing the methodology. The experiments were run by N.G., M.K., C.E., M.M. and A.F. The results were visualized by N.G. and A.E.G. A.E.G., M.H.J. and M.S.H. acquired funding. The project was administered and supervised by A.E.G. N.G. and M.S.N. wrote the original draft of the manuscript. N.G., M.S.N., C.E. and A.E.G. reviewed and edited the manuscript. Intellectual support was provided by U.K., A.K., M.H.J., M.S.H. and H.H.
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Gutu, N., Nordentoft, M.S., Kuhn, M. et al. Circadian coupling orchestrates cell growth. Nat. Phys. 21, 768–777 (2025). https://doi.org/10.1038/s41567-025-02838-4
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DOI: https://doi.org/10.1038/s41567-025-02838-4
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