Am J Hum Genet. 2000 Jul;67(1):207-12. Epub 2000 May 25.

The exon 13 duplication in the BRCA1 gene is a founder mutation present in geographically diverse populations. The BRCA1 Exon 13 Duplication Screening Group.

[No authors listed]

Abstract

Recently, a 6-kb duplication of exon 13, which creates a frameshift in the coding sequence of the BRCA1 gene, has been described in three unrelated U.S. families of European ancestry and in one Portuguese family. Here, our goal was to estimate the frequency and geographic diversity of carriers of this duplication. To do this, a collaborative screening study was set up that involved 39 institutions from 19 countries and included 3,580 unrelated individuals with a family history of the disease and 934 early-onset breast and/or ovarian cancer cases. A total of 11 additional families carrying this mutation were identified in Australia (1), Belgium (1), Canada (1), Great Britain (6), and the United States (2). Haplotyping showed that they are likely to derive from a common ancestor, possibly of northern British origin. Our results demonstrate that it is strongly advisable, for laboratories carrying out screening either in English-speaking countries or in countries with historical links with Britain, to include within their BRCA1 screening protocols the polymerase chain reaction-based assay described in this report.

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The exon 13 duplication in the BRCA1 gene is a founder mutation present in geographically diverse populations. The BRCA1 Exon 13 Duplication Screening Group.

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