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Novel p53 mutants selected in BRCA-associated tumours which dissociate transformation suppression from other wild-type p53 functions

Abstract

Inheritance of germ-line mutant alleles of BRCA1 and BRCA2 confers a markedly increased risk of breast cancer and we have previously reported a higher incidence of p53 mutations in these tumours than in grade matched sporadic tumours. We have now characterized these p53 mutants. The results of these studies identify a novel class of p53 mutants previously undescribed in human cancer yet with multiple occurrences in BRCA-associated tumours which retain a profile of p53-dependent activities in terms of transactivation, growth suppression and apoptosis induction which is close or equal to wild-type. However, these mutants fail to suppress transformation and exhibit gain of function transforming activity in rat embryo fibroblasts. These mutants therefore fall into a novel category of p53 mutants which dissociate transformation suppression from other wild-type functions. The rarity of these mutants in human cancer and their multiple occurrence in BRCA-associated breast tumours suggests that these novel p53 mutants are selected during malignant progression in the unique genetic background of BRCA1- and BRCA2-associated tumours.

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Acknowledgements

We thank K Vousden for pCB6+173L, R Weinberg for pEJ6.6, B Vogelstein for Waf1 luciferase and PIG3 luciferase, J Reid for Bax luciferase, L Buckbinder for IGF BP3 Box A luciferase, Moshe Oren for MDM2 luciferase and Xin Lu for the anti-p21Waf1 antibody. T Crook is a Leopold Muller Fellow. J Waller is funded by US Army grant number DAMD17-94-4066, L Brooks is supported by the Medical Research Council, P Osin by the Gilbert Fellowship and G Parker by the Wellcome Trust. Various parts of the work were supported by the Cancer Research Campaign and Breakthrough Breast Cancer.

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Smith, P., Crossland, S., Parker, G. et al. Novel p53 mutants selected in BRCA-associated tumours which dissociate transformation suppression from other wild-type p53 functions. Oncogene 18, 2451–2459 (1999). https://doi.org/10.1038/sj.onc.1202565

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