Abstract
Checkpoints arrest biological processes, allowing time for error correction. The phenomenon of checkpoint override during cellular self-replication is biologically critical, but it currently lacks a quantitative, functional or system-level understanding. To uncover fundamental laws governing error correction systems, we derived a general theory of optimal checkpoint strategies, balancing the trade-off between risk and self-replication speed. Mathematically, the problem maps onto the optimization of an absorbing boundary for a random walk. We applied the theory to the DNA damage checkpoint in budding yeast, an intensively researched model checkpoint. Using novel reporters for double-strand DNA breaks (DSBs), we first quantified the probability distribution of DSB repair in time including rare events; second, we determined the survival probability after override. With these inputs, the optimal theory remarkably accurately predicted override times as a function of DSB numbers, which we precisely measured for the first time. Thus, a first-principles calculation revealed undiscovered patterns underlying highly noisy override processes. Our multi-DSB measurements revise well-known past results and show that override is more general than previously thought.
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The data that support the findings of this study are available from the corresponding author upon reasonable request.
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Acknowledgements
S.J.R. thanks F. R. Cross, J. E. Haber, F. Zhou and A. Pellicioli for fruitful discussions, as well as E. Alani for the reagents. We thank E. Tenaglia for technical advice and help with strain construction. We thank P. Ehsani for technical advice and reagents. This work was supported by funding from École polytechnique fédérale de Lausanne (EPFL) (S.J.R.) and SNSF Division III project grant 310030_204938 (S.J.R.).
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A.S. performed the FACS and microscopy measurements and was helped with the latter by V.G. and M.L. A.S., R.D. and S.J.R. made the constructs and strains. A.S. analysed the data and was helped by R.D. and S.J.R. A.S. performed the numerical calculations. S.J.R. wrote the manuscript. S.J.R. devised the theory and analytical calculations. All the authors contributed to reviewing and editing the article.
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Sadeghi, A., Dervey, R., Gligorovski, V. et al. The optimal strategy balancing risk and speed predicts DNA damage checkpoint override times. Nat. Phys. 18, 832–839 (2022). https://doi.org/10.1038/s41567-022-01601-3
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DOI: https://doi.org/10.1038/s41567-022-01601-3
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