Haplotype and cancer risk analysis of two common mutations, BRCA1 4184del4 and BRCA2 2157delG, in high risk northwest England breast/ovarian families

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Abstract
Full gene screening for mutations in the northwest of England has identified two recurrent mutations.4BRCA1 4182delAATC (4184del TCAA or 4184del4) is a frameshift mutation that results in a stop at codon 1364, causing a truncated protein product. This mutation has been reported 75 times in the Breast Cancer Information Core (BIC) website (www.nhgri.nih.gov/Intramural_research/Lab_transfer/Bic/).5 In one study, it was identified in breast cancer cases in Britain, France, and the United States.6 The mutation was associated with three different haplotypes, indicating that it is a recurrent rather than a founder mutation. BRCA2 2157delG is also a frameshift mutation resulting in a stop at codon 659, causing a truncated protein product. It was reported in a British study in 1997,7 and has also been listed 17 times on the BIC website.

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