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Mol Carcinog. 2019 Jan;58(1):156-160. doi: 10.1002/mc.22910. Epub 2018 Sep 22.

Unraveling the molecular effect of a rare missense mutation in BRIP1 associated with inherited breast cancer.

Author information

1
Cancer Genetics Group, Institute of Genetics and Molecular Biology (UVa-CSIC), Valladolid, Spain.
2
Unit of Genetic Counseling in Cancer, Complejo Hospitalario de Burgos, Burgos, Spain.
3
Unit of Genetic Counseling in Cancer, Hospital Universitario Rio Hortega, Valladolid, Spain.

Abstract

BRIP1 is a component of the Fanconi Anemia/BRCA pathway responsible for DNA reparation via helicase activity. Some heterozygous variants in BRIP1 could contribute to Hereditary Breast Cancer through a defective DNA repair. The clinical utility of BRIP1 mutations in a familial cancer context is compromised by the conflicting interpretation of "variants of uncertain significance" (VUS). Defining the clinical significance of variants identified in genetic tests is a major challenge; therefore, studies that evaluate the biological effect of these variants are definitely necessary. To contribute to this purpose, we have characterized the variant c.550G>T of BRIP1, a missense mutation with little evidence about its pathogenicity. Since Human Splicing FinderTM predicts the creation of a new exonic splicing enhancer site we decided to perform cDNA analysis revealing that the c.550G>T mutation located in exon 6 led to an aberrant transcript causing exon 5 skipping. Our results demonstrate that the c.550G>T BRIP1 variant disrupts normal splicing, causing exon 5 skipping. Considering that the exon 5 encodes the helicase domain of BRIP1, it is expected an alteration of the function. This finding enhances the interpretation of this VUS, suggesting a potential pathogenic effect.

KEYWORDS:

BRIP1; aberrant splicing; germline mutations; hereditary breast and ovarian cancer

PMID:
30230034
DOI:
10.1002/mc.22910
[Indexed for MEDLINE]

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