A high incidence of BRCA1 mutations in 20 breast-ovarian cancer families

Olga Serova, Marco Montagna, Delphine Torchard, Steven A. Narod, Patricia Tonin, Bakary Sylla, Henry T. Lynch, Jean Feunteun, Gilbert M. Lenoir

Research output: Contribution to journalArticle

Abstract

We have analyzed 20 breast-ovarian cancer families, the majority of which show positive evidence of linkage to chromosome 17q12, for germ-line mutations in the BRCA1 gene. BRCA1 mutations cosegregating with breast and ovarian cancer susceptibility were identified in 16 families, including 1 family with a case of male breast cancer. Nine of these mutations have not been reported previously. The majority of mutations were found to generate a premature stop codon leading to the formation of a truncated BRCA1 protein of 2%-88% of the expected normal length. Two mutations altered the RING finger domain. Sequencing of genomic DNA led to the identification of a mutation in the coding region of BRCA1 in 12 families, and cDNA analysis revealed an abnormal or missing BRCA1 transcript in 4 of the 8 remaining families. A total of eight mutations were associated with a reduced quantity of BRCA1 transcript. We were unable to detect BRCA1 mutations in 4 of the 20 families, but only 1 of these was clearly linked to BRCA1. It is expected that the majority of clear examples of the breast-ovarian cancer syndrome will be associated with germ-line mutations in the coding region of BRCA1.

Original languageEnglish
Pages (from-to)42-51
Number of pages10
JournalAmerican Journal of Human Genetics
Volume58
Issue number1
Publication statusPublished - 1996

ASJC Scopus subject areas

  • Genetics

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    Serova, O., Montagna, M., Torchard, D., Narod, S. A., Tonin, P., Sylla, B., Lynch, H. T., Feunteun, J., & Lenoir, G. M. (1996). A high incidence of BRCA1 mutations in 20 breast-ovarian cancer families. American Journal of Human Genetics, 58(1), 42-51.