Genetic sequence variations and ADPRT haplotype analysis in French Canadian families with high risk of breast cancer
- PMID:17943227
- DOI: 10.1007/s10038-007-0203-9
Genetic sequence variations and ADPRT haplotype analysis in French Canadian families with high risk of breast cancer
Abstract
The poly(ADP-ribose) polymerase (PARP/ADPRT) protein family catalyzes the synthesis of cellular poly(ADP-ribose) following DNA damage and is involved in genomic integrity by regulating cellular responses to DNA damage and apoptosis. Moreover, ADPRT inhibition contributes to a protective effect against cancer development. These findings render ADPRT an attractive candidate susceptibility gene for breast cancer, and thus the goal of this study was to evaluate the possible involvement of ADPRT sequence variations in breast cancer susceptibility. The complete sequence of the 23 exons and flanking intronic sequences of the ADPRT gene was analyzed in 54 affected individuals from distinct high-risk non-BRCA1/2 French Canadian families. No deleterious truncating mutation was identified in the coding region. However, 34 sequence variations were identified, among which seven are coding variants and seven are novel changes. All coding variants and intronic changes located in the vicinity of the coding variants identified in the case series were also analyzed in a cohort of 73 unrelated healthy French Canadian individuals. Interestingly, one missense variant (Pro377Ser) was observed in three different breast cancer cases but was not present among unaffected individuals. We have conducted here an exhaustive detailed mutation and haplotype tagging analysis of the ADPRT gene with regard to breast cancer, providing useful data for other large-scale association studies. Additional studies in other cohorts and other populations are however needed to further evaluate the implication of the Pro377Ser missense variant with regard to breast cancer susceptibility.
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