title: Germline BRCA1 mutation analysis in Indian breast/ovarian cancer families.
abstract: Most of the predisposition to hereditary breast and ovarian cancer has been attributed to inherited defects in two tumor suppressor genes BRCA1 and BRCA2. To explore the contribution of BRCA1 mutations to hereditary breast cancer among Indian women, we examined the coding sequence of the BRCA1 gene in 14 breast cancer patients with a positive family history of breast and/or ovarian cancer. Mutation analysis was carried out using conformation sensitive gel electrophoresis (CSGE) followed by sequencing. Three mutations (21%) in the BRCA1 gene were identified. Two of them are novel mutations of which one is a missense mutation in exon 7 near the RING finger domain, while the other is a one base pair deletion in exon 11 which results in protein truncation. The third mutation, 185 delAG, has been previously described in Ashkenazi Jewish families. To our knowledge this is the first report of a study of germline BRCA1 mutation analysis in familial breast cancer in India. Our data from 14 different families suggests a lower prevalence but definite involvement of germline mutations in the BRCA1 gene among Indian women with breast cancer and a family history of breast cancer.
authors.affiliation: Division of Cancer Research, Indian Institute of Science, Bangalore, India 560 012.
authors.forename: B Vinod
authors.initials: BV
authors.lastname: Kumar
authors.forename: Smita
authors.initials: S
authors.lastname: Lakhotia
authors.forename: Ravindran
authors.initials: R
authors.lastname: Ankathil
authors.forename: Jayaprakash
authors.initials: J
authors.lastname: Madhavan
authors.forename: P G
authors.initials: PG
authors.lastname: Jayaprakash
authors.forename: M Krishnan
authors.initials: MK
authors.lastname: Nair
authors.forename: Kumaravel
authors.initials: K
authors.lastname: Somasundaram
mesh_terms: D001943:Breast Neoplasms / Q000453:epidemiology / Q000235:genetics*; D004252:DNA Mutational Analysis; D004273:DNA, Neoplasm / Q000235:genetics; D005091:Exons / Q000235:genetics; D005260:Female; D018703:Founder Effect; D019398:Genes, BRCA1; D020022:Genetic Predisposition to Disease; D018095:Germ-Line Mutation; D006801:Humans; D007194:India / Q000453:epidemiology; D007585:Jews / Q000235:genetics; D020125:Mutation, Missense; D009386:Neoplastic Syndromes, Hereditary / Q000453:epidemiology / Q000235:genetics*; D010051:Ovarian Neoplasms / Q000453:epidemiology / Q000235:genetics*; D017354:Point Mutation; D015995:Prevalence; D017384:Sequence Deletion
chemical_list: D004273:DNA, Neoplasm