title: Novel somatic mutations in the BRCA1 gene in sporadic breast tumors.
abstract: Germline mutations in two major susceptibility genes BRCA1 and BRCA2 contribute to the majority of inherited breast and ovarian cancers. Besides the germline mutation, tumor progression depends on the loss of a wild-type allele. Allelic losses in the BRCA1 and BRCA2 loci have also been detected in a high proportion of sporadic breast tumors, suggesting the role of these genes in the development of non-inherited breast cancer. Forty unselected breast tumors were analyzed for the loss of heterozygosity (LOH) at BRCA1 and BRCA2 regions and tumors with allelic deletions were screened for the presence of acquired genetic alterations in respective genes. 21.1% of 38 informative tumor samples carried LOH at the BRCA1 locus whereas 33.3% of 39 informative samples showed LOH at the BRCA2 locus. Pathogenic truncating mutations in the BRCA1 gene were found in two tumor samples with allelic losses, whereas no mutations were identified in the BRCA2 gene. Mutations were not detected in non-tumor samples from the same individuals, which indicated that the BRCA1 allele was inactivated by somatic mutations in tumor tissue. The c.1116G>A (1235G>A) nonsense mutation (p.W372X) belongs to the genetic abnormalities detected infrequently in hereditary tumors; the c.3862delG (3981delG) frameshift mutation (p.E1288fsX1306) is a novel gene alteration. The occurrence of inactivating somatic mutations in sporadic breast tumors suggested the role of the BRCA1 gene in tumorigenesis in at least a minor group of patients with non-familial breast cancer.
authors.affiliation: Department of Biochemistry and Experimental Oncology, Charles University in Prague, Prague, Czech Republic. mjana@lf1.cuni.cz <mjana@lf1.cuni.cz>
authors.forename: Marketa
authors.initials: M
authors.lastname: Janatova
authors.forename: Michal
authors.initials: M
authors.lastname: Zikan
authors.forename: Pavel
authors.initials: P
authors.lastname: Dundr
authors.forename: Bohuslav
authors.initials: B
authors.lastname: Matous
authors.forename: Petr
authors.initials: P
authors.lastname: Pohlreich
mesh_terms: D000328:Adult; D000368:Aged; D019313:BRCA1 Protein / Q000502:physiology; D001943:Breast Neoplasms / Q000235:genetics*; D018270:Carcinoma, Ductal, Breast / Q000235:genetics; D002471:Cell Transformation, Neoplastic / Q000235:genetics; D018389:Codon, Nonsense; D004252:DNA Mutational Analysis; D004273:DNA, Neoplasm / Q000235:genetics; D005260:Female; D016368:Frameshift Mutation; D019398:Genes, BRCA1; D024522:Genes, BRCA2; D006801:Humans; D019656:Loss of Heterozygosity; D018895:Microsatellite Repeats; D008875:Middle Aged; D017422:Sequence Analysis, DNA
chemical_list: D019313:BRCA1 Protein; D018389:Codon, Nonsense; D004273:DNA, Neoplasm