Abstract
We report here a systematic analysis of the effects of different p53 mutations on both spontaneous and radiation-stimulated homologous recombination in mouse L cells. In order to monitor different recombination pathways, we used both direct and inverted repeat recombination substrates. In each line bearing one of these substrates, we expressed p53 proteins mutated at positions: 175, 248 or 273. p53 mutations leading to an increased spontaneous recombination rate also stimulate radiation-induced recombination. The effect on recombination may be partially related to the conformation of the p53 protein. Moreover, p53 mutations act on recombination between direct repeats as well as between inverted repeats indicating that strand invasion mechanisms are stimulated. Although all of the p53 mutations affect the p53 transactivation activity measured on the WAF1 and MDM2 gene promoters, no correlation between the transactivation activity and the extent of homologous recombination can be drawn. Finally, some p53 mutations do not affect the G1 arrest after radiation but stimulate radiation-induced recombination. These results show that the role of p53 on transactivation and G1 cell cycle checkpoint is separable from its involvement in homologous recombination. A direct participation of p53 in the recombination mechanism itself is discussed.
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Acknowledgements
Thanks are due to Drs E May, M Liskay and C Ory for their generous gift of materials. We are grateful to Dr N Green for providing us with the computer application for the fluctuation analysis. We thank Drs P May, C Ory, C White and the members of our laboratory for helpful and stimulating discussions. Yannick Saintigny was supported by an EDF/INSTN fellowship. This work was supported by ARC (1366), ANRS and Electricité de France.
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Saintigny, Y., Rouillard, D., Chaput, B. et al. Mutant p53 proteins stimulate spontaneous and radiation-induced intrachromosomal homologous recombination independently of the alteration of the transactivation activity and of the G1 checkpoint. Oncogene 18, 3553–3563 (1999). https://doi.org/10.1038/sj.onc.1202941
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DOI: https://doi.org/10.1038/sj.onc.1202941
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