Carcinogenesis Advance Access originally published online on February 25, 2006
Carcinogenesis 2006 27(8):1655-1660; doi:10.1093/carcin/bgi374
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Interaction of Werner and Bloom syndrome genes with p53 in familial breast cancer
1 Division of Molecular Genetic Epidemiology, German Cancer Research Center (DKFZ) Im Neuenheimer Feld 580, 69120, Heidelberg, Germany
2 Department of Biosciences at Novum, Karolinska Institute Huddinge, Sweden
3 Institute of Human Genetics, University of Heidelberg Heidelberg, Germany
4 Division of Molecular Gynaeco-Oncology, Department of Gynaecology and Obstetrics, Center of Molecular Medicine Cologne (CMMC), University Hospital of Cologne Germany
5 Department of Gynaecology and obstetrics, Klinikum rechts der Isar at the Technical University Munich, Germany
6 Division of Oncology, Department of Gynaecology and Obstetrics, University Hospital Schleswig-Holstein Kiel, Germany
7 Institute of Human Genetics, University of Regensburg Regensburg, Germany
8 Division of Molecular Genetics, Department of Gynaecology and Obstetrics, Clinical Center University of Düsseldorf Düsseldorf, Germany
9 Helmholtz-university Group Molecular Epidemiology, German Cancer Research Center (DKFZ) Heidelberg, Germany
*To whom correspondence should be addressed. Tel: +49 6221 421811; Email: m.wirtenberger{at}dkfz.de
Mutations of the human RecQ helicase genes WRN and BLM lead to rare autosomal recessive disorders, Werner and Bloom syndromes, which are associated with premature ageing and cancer predisposition. We tested the hypothesis whether three polymorphic, non-conservative amino acid exchanges in WRN and BLM act as low-penetrance familial breast cancer risk factors. Moreover, we examined the putative impact of p53 MspI 1798G>A, which is completely linked to p53PIN3, a 16 bp insertion/duplication that has been associated with reduced p53 expression, on familial breast cancer risk. Genotyping analyses, performed on 816 BRCA1/2 mutation-negative German familial breast cancer patients and 1012 German controls, revealed a significant association of the WRN Cys1367Arg polymorphism with familial breast cancer (OR = 1.28, 95% CI 1.06–1.54) and high-risk familial breast cancer (OR = 1.32, 95% CI 1.06–1.65). The analysis of p53 MspI 1798G>A, which is completely linked to p53PIN3, showed a significantly increased familial breast cancer risk for carriers of the 16 bp insertion/duplication, following a recessive mode (OR = 2.15, 95% CI = 1.12–4.11). WRN Cys1367Arg, located in the C-terminus, the binding site of p53, is predicted to be damaging. The joint effect of WRN Cys1367Arg and p53 MspI resulted in an increased breast cancer risk compared to the single polymorphisms (OR = 3.39, 95% CI 1.19–9.71). In conclusion, our study indicates the importance of inherited variants in the WRN and p53 genes for familial breast cancer susceptibility.
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