Journal
MOLECULAR CELL
Volume 71, Issue 4, Pages 581-+Publisher
CELL PRESS
DOI: 10.1016/j.molcel.2018.06.031
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Funding
- NIH [GM116864, CA207727]
- CONACyT/Fundacion Mexico en Harvard [404476]
- Harvard Graduate Merit Fellowship
- NIH (P50 grant) [GM107618]
- Jane Coffin Childs Memorial Fund for Medical Research
- NATIONAL CANCER INSTITUTE [R00CA207727, K99CA207727] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE OF GENERAL MEDICAL SCIENCES [R01GM116864, P50GM107618] Funding Source: NIH RePORTER
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Biological signals need to be robust and filter small fluctuations yet maintain sensitivity to signals across a wide range of magnitudes. Here, we studied how fluctuations in DNA damage signaling relate to maintenance of long-term cell-cycle arrest. Using live-cell imaging, we quantified division profiles of individual human cells in the course of 1 week after irradiation. We found a subset of cells that initially establish cell-cycle arrest and then sporadically escape and divide. Using fluorescent reporters and mathematical modeling, we determined that fluctuations in the oscillatory pattern of the tumor suppressor p53 trigger a sharp switch between p21 and CDK2, leading to escape from arrest. Transient perturbation of p53 stability mimicked the noise in individual cells and was sufficient to trigger escape from arrest. Our results show that the self-reinforcing circuitry that mediates cell-cycle transitions can translate small fluctuations in p53 signaling into large phenotypic changes.
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