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Double Heterozygosity of Brca2 and Stk11 in Familial Breast Cancer Detected by Exome Sequencing



Ataeikachouei M1 ; Nadaf J2 ; Akbari MT1 ; Atri M3 ; Majewski J4 ; Riazalhosseini Y4 ; Garshasbi M1
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Source: Iranian Journal of Public Health Published:2015

Abstract

Background: Germ-line mutations of BRCA1 and BRCA2 genes are responsible for approximately 25-30% of domi-nantly inherited familial breast cancers; still a big part of genetic component is unknown. The aim of this study was to investigate genetic causes of familial breast cancer in a pedigree with recessive pattern of inheritance. Methods: We applied exome sequencing as a useful approach in heterogeneous diseases gene identification in present study for familial breast cancer. Sanger sequencing was applied for validation and segregation analysis of mutations. Results: Here, we describe a family with three affected sisters of early-onset invasive ductal carcinoma due to hetero-zygous frame shift mutation rs80359352 in BRCA2 gene as the first report in Iranian patients in association with a novel missense SNP of STK11 (p.S422G). These mutations are inherited from their normal father. Conclusion: Despite apparent recessive pattern of inheritance a dominant gene (here BRCA2) can be involved in pathogenesis of hereditary breast cancer which can be explained by incomplete penetrance of BRCA2 mutations. © 2015, Iranian Journal of Public Health. All rights reserved.
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