Abstract
Completion of genome duplication is challenged by structural and topological barriers that impede progression of replication forks. Although this can seriously undermine genome integrity, the fate of DNA with unresolved replication intermediates is not known. Here, we show that mild replication stress increases the frequency of chromosomal lesions that are transmitted to daughter cells. Throughout G1, these lesions are sequestered in nuclear compartments marked by p53-binding protein 1 (53BP1) and other chromatin-associated genome caretakers. We show that the number of such 53BP1 nuclear bodies increases after genetic ablation of BLM, a DNA helicase associated with dissolution of entangled DNA. Conversely, 53BP1 nuclear bodies are partially suppressed by knocking down SMC2, a condensin subunit required for mechanical stability of mitotic chromosomes. Finally, we provide evidence that 53BP1 nuclear bodies shield chromosomal fragile sites sequestered in these compartments against erosion. Together, these data indicate that restoration of DNA or chromatin integrity at loci prone to replication problems requires mitotic transmission to the next cell generations.
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Acknowledgements
We thank J. Ellenberg and R. Pepperkok for help with the siRNA screen and for commenting on the manuscript. We also thank J. Chen, D. Durocher and R. Freire for reagents. This work was supported by grants from the Danish Cancer Society, Danish National Research Foundation, European Commission (projects GENICA, and Biomedreg), the Lunbeck Foundation, Danish Council for Independent Research—Medical Sciences, and the John and Birthe Meyer Foundation.
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C.L. and J.L. conceived the study. C.L. carried out or supervised all imaging experiments; V.S. carried out the ChIP analyses and TdT labelling; C.L., B.N. and C.D. carried out and mined the siRNA screen; S.B-J. analysed 53BP1 nuclear dynamics; R.S.P. analysed 53BP1 focus formation in synchronized cells; M.G. analysed the siRNA specificity by western blotting; and K.L.C. and I.D.H. contributed to the BLM analysis and UFB detection. All authors participated in data analyses. I.D.H., J.B. and J.L. wrote the manuscript.
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Lukas, C., Savic, V., Bekker-Jensen, S. et al. 53BP1 nuclear bodies form around DNA lesions generated by mitotic transmission of chromosomes under replication stress. Nat Cell Biol 13, 243–253 (2011). https://doi.org/10.1038/ncb2201
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DOI: https://doi.org/10.1038/ncb2201
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