Mutation analysis of the gene encoding the PALB2-binding protein MRG15 in BRCA1/2-negative breast cancer families
Thomas Rio Frio1, Maria Haanpää, Carly Pouchet
1Program in Cancer Genetics, Department of Human Genetics and Department of Oncology, McGill University, Montreal, Quebec, Canada.
Abstract:
MRG15 is a recently identified member of the BRCA multiprotein complex, essential for the maintenance of the genome integrity and DNA repair. The functional relationship between PALB2 and MRG15 makes MRG15 a strong candidate breast cancer susceptibility gene. We screened affected probands from 232 BRCA1/2-negative breast cancer families for mutations in MRG15. We identified seven previously unreported variants but in silico analyses revealed that none of these variants appears to modify the function of MRG15. Thus, it seems unlikely that any constitutional changes in MRG15 confer an increased risk for breast cancer.
Insights
Mutations in the MRG15 gene, a BRCA partner involved in DNA repair, were investigated in breast cancer families. No functional mutations were found, suggesting MRG15 is unlikely to be a breast cancer susceptibility gene.
Area of Science:
- Genetics
- Oncology
- Molecular Biology
Background:
- MRG15 is a component of the BRCA complex, crucial for genome integrity and DNA repair.
- Its functional link with PALB2 suggests MRG15 could be a breast cancer susceptibility gene.
Purpose of the Study:
- To investigate mutations in the MRG15 gene in BRCA1/2-negative breast cancer families.
- To determine if MRG15 mutations confer an increased risk for breast cancer.
Main Methods:
- Screening of MRG15 in affected individuals from 232 BRCA1/2-negative breast cancer families.
- In silico analysis of identified variants to assess functional impact.
Main Results:
- Seven novel variants in MRG15 were identified.
- In silico analysis indicated no functional modification by these variants.
Conclusions:
- Constitutional changes in MRG15 are unlikely to increase breast cancer risk.
- MRG15 is not a significant breast cancer susceptibility gene in the studied population.
