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Two founder BRCA2 mutations predispose to breast cancer in young women
Mar Infante1, Mercedes Durán, Adriana Lasa
1Genética del Cáncer, Instituto de Biología y Genética Molecular (UVa-CSIC), Sanz y Forés s/n, 47003, Valladolid, Spain.
Abstract:
The mutation spectrum of BRCA1 and BRCA2 presents a wide range of unique mutations in breast/ovarian cancer patients but recurrent mutations with founder effects have also been described. BRCA2 5344delAATA and 9538delAA are recurrent mutations in Castilla-León (Spain) representing 10.6% of BRCA2 positive families. By genotyping eleven chromosome 13 markers (4.3 Mb) we demonstrate that each mutation shows core haplotypes of 1.66 and 0.87 Mb, respectively, supporting a common ancestor in Castilla-León. Furthermore, both mutations are associated with earlier onset of breast cancer (5344delAATA: 37.4 years, P = 0.033; 9538delAA: 39.4 years, P = 0.008). The identification of founder effects improves the genetic screening strategy to be followed and facilitates the clinical management of asymptomatic carriers.
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