Abstract
There is now evidence to suggest that BRCA1 and BRCA2 are involved in the response of cells to DNA damage and cell cycle checkpoint control. This report examines the death pathways of human cells with various BRCA1 and BRCA2 genotypes after exposure to gamma-rays. A lack of functional BRCA1 and BRCA2 led to defective repair of DNA double-strand breaks in irradiated cells. This impairment resulted in a relaxation of cell cycle checkpoints, production of micronuclei, and a loss of proliferative capacity. Heterozygous BRCA1 and BRCA2 mutations also led to enhanced radiosensitivity, with an impaired proliferative capacity after irradiation. The existence of a phenotype related to radiosensitivity in BRCA1+/− and BRCA2+/− cells raises the question of the response of heterozygous women to radiation.
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Acknowledgements
We thank Arlette Vervisch (Cytometry laboratory – CNRS) for her excellent technical assistance in cell cycle analysis. Dr Agnès Hardouin is gratefully acknowledged for communicating the status of BRCA1 in the IGROV1 cell line prior to publication. This work was supported by a Contrat Libre (No. 9023) from ARC. N Foray was supported by post-doctoral fellowships from the Ligue Nationale Contre le Cancer and from Electricité de France (Département de Radioprotection).
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Foray, N., Randrianarison, V., Marot, D. et al. Gamma-rays-induced death of human cells carrying mutations of BRCA1 or BRCA2. Oncogene 18, 7334–7342 (1999). https://doi.org/10.1038/sj.onc.1203165
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DOI: https://doi.org/10.1038/sj.onc.1203165
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