Abstract
Deleterious mutations in several genes that are involved in repair of damage to DNA have been associated with an increased risk of breast cancer. Recent studies have shown sequence variants in two such genes, RAD50 and NBS1, which can be predisposed to breast cancer. The aim of this study is to elucidate the contribution of RAD50 and NBS1 germline mutations to the etiology of non-BRCA1/2 hereditary breast cancer in China. We conducted a mutational analysis of RAD50 and NBS1 in genomic DNA from 384 Chinese women with early-onset breast cancer and/or affected relatives. All the coding exons and adjacent intronic splice junction rejoins of RAD50 and NBS1 were screened using PCR-DHPLC and DNA sequencing analysis. Among all cases, no obviously deleterious mutations were observed in RAD50; one synonymous change c.102G>A at codon 34 and one single nucleotide polymorphism IVS9 + 19C>T were identified in NBS1. Furthermore, there was no remarkable difference in the allele frequency of NBS1 c.553G>C (E185Q) between cases (172/384) and controls (182/420). Our results exclude the possible role of RAD50 and NBS1 in familial breast cancer predisposition in Chinese women, and there is no evidence for the recommendation of RAD50 and NBS1 for genetic testing in China.
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Single nucleotide polymorphisms [http://www.ncbi.nlm.nih.gov/SNP/]
Acknowledgments
We thank all the family members for their willingness to cooperate with our study. This research was supported in part by the grants from the National Basic Research Program of China (2006CB910501), National Natural Science Foundation of China (30371580, 30572109); Shanghai Science and Technology Committee (03J14019, 06DJ14004, 06DZ19504).
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The authors declare that they have no conflict of interest.
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Min He, Gen-Hong Di and A-Yong Cao contributed equally for this study.
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He, M., Di, GH., Cao, AY. et al. RAD50 and NBS1 are not likely to be susceptibility genes in Chinese non-BRCA1/2 hereditary breast cancer. Breast Cancer Res Treat 133, 111–116 (2012). https://doi.org/10.1007/s10549-011-1700-2
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DOI: https://doi.org/10.1007/s10549-011-1700-2