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- W2026470436 abstract "41 breast cancer or breast-ovarian cancer families, including 12 families with at least one affected first-degree male relative, were screened for mutations in the BRCA2 gene. Mutations had not been found in the BRCA1 gene of these families. Chemical cleavage of mismatch was used to identify nucleotide changes within large PCR products (average size 1.2 kb) that carried strand-specific fluorescent end-labels. 15 amplicons were sufficient to scan 18 exons, including the large exon 11. The remaining 9 small exons were examined by Denaturing Gradient Gel Electrophoresis. The high sensitivity of this approach was documented by the detection, in these 41 patients, of all 9 exonic single nucleotide polymorphisms reported with heterozygosity >0.1. Truncating BRCA2 mutations were found in 7 of the 41 families. 3 of them were in the group of 12 families comprising cases of male breast cancer. Since the methods used here have no bias for particular types of mutations, these data confirm the high proportion of frameshifts among mutations in BRCA2. However, relevant single nucleotide substitutions were also found: one resulting in a stop codon and another one, present in a male patient, was the previously reported change Asp2723His, that affects a highly conserved region of the BRCA2 protein. This study indicates a BRCA2 contribution of 10% (95% CI 2.5-17.5) to our original cohort of 59 breast-ovarian cancer families, whereas the contribution of BRCA1 had been estimated at 46% (95% CI 33-59)." @default.
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- W2026470436 date "2001-01-01" @default.
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- W2026470436 title "Screening of male breast cancer and of breast-ovarian cancer families for BRCA2 mutations using large bifluorescent amplicons" @default.
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- W2026470436 doi "https://doi.org/10.1054/bjoc.2000.1627" @default.
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