EXOME SEQUENCING COUPLED WITH IN SILICO FUNCTIONAL ANALYSIS IN CONSANGUINEOUS PAKISTANI FAMILIES INHERITING BREAST CANCER DETERMINED THE FOUNDER EFFECT OF THE MUTATION C.1961DUPA (P.TYR655VALFS18*) IN THE BRCA1 GENE
Main Article Content
Keywords
Breast Cancer, Pakistani, Mutation, Dominant, BRCA1, Exon
Abstract
Mutations in several genes are now known to cause susceptibility to breast cancer. In Pakistan, very little is known about the genetic spectrum of Breast cancer. So, the main aim of the current genetic study was to investigate the four unrelated Saraiki origin consanguineous Pakistani families segregating breast cancer. Methodology for genetic analysis includes Whole Exome Sequencing (WES) and Sanger sequencing; however, in silico functional analysis was done using I-TASSER (for 3D structure modeling and Cluspro tool (for Protein-Protein interaction). Analysis of exome data identified previously reported frameshift heterozygous duplication mutation c.1961dupA (p.Tyr655Valfs18*) in the 10th exon of the BRCA1 gene inherited in the autosomal dominant pattern in all the families. No symptoms were found in the male individuals of the families. In silico functional analysis also revealed the mutation's adverse effect on protein structure and interaction. We hypothesized on the evolutionary importance of this mutation and suggest that it has a substantial founder impact in the Saraiki-derived Jhakar tribe of Pakistan. Based on these findings, we propose creating a molecular diagnostic tool for premarital and prenatal screening of breast cancer-risk families.
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