Mutational analysis of the breast cancer susceptibility gene BRIP1 /BACH1/FANCJ in high-risk non-BRCA1/BRCA2 breast cancer families.

Journal of Human Genetics
Frédéric GuénardFrancine Durocher

Abstract

The BRIP1 gene encodes a helicase interacting with BRCA1, which contributes to BRCA1-associated DNA repair function. Germ-line BRIP1 mutations affecting the helicase domain activity have been identified in early onset breast cancer patients. In addition, BRIP1 was recently identified as deficient in Fanconi anemia (FA) complementation group J. Given the growing evidence now linking BRCA1, BRCA2, and the FA pathway, as well as the involvement of FA proteins (BRCA2/FANCD1 and PALB2/FANCN) in breast cancer susceptibility, we sought to evaluate the contribution of FANCJ gene alterations regarding breast cancer susceptibility among our cohort of 96 breast cancer individuals from high-risk non-BRCA1/2 French Canadian families. No deleterious mutation, exon deletion, or retention of intronic portions could be identified. However, extensive analysis of the promoter and whole exonic and flanking intronic regions of FANCJ led to the identification of 42 variants, including 22 novel variants not previously reported, four of which were located in the promoter region. Transcription factors analysis revealed a potential involvement of FANCJ promoter variants in regulation of FANCJ expression, and reporter gene assays were performed. The alle...Continue Reading

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