Targeted BRCA1/BRCA2 Sequencing in a Bangladeshi Clinically Referred Cohort Identifies Candidate BRCA1 Loss-of-Function Variants and a Multi-Exon Deletion-Like CNV Signal

Targeted NGS sequencing of BRCA1/BRCA2 in a clinically referred Bangladeshi cohort — identification of candidate BRCA1 truncating variants and multi-exon deletion-like signal

In a targeted BRCA1/BRCA2 pilot on 23 clinically referred Bangladeshi samples, 6 candidate heterozygous BRCA1 truncating variants (5 frameshifts + 1 stop gain) were identified, located in the central to C-terminal portion of BRCA1. A candidate multi-exon deletion-like signal (BRCA1 exons 15-20) was also detected. Sequencing depth was excellent (>280× for all amplicons). These preliminary results constitute the first targeted BRCA1/BRCA2 dataset in a Bangladeshi population.

Synthesis written by Geno'X. For the full original abstract, please refer to the source publication.

BRCA data are lacking for South Asian populations, creating major obstacles for variant interpretation and genetic counseling. This Bangladeshi pilot, very preliminary (n=23), is important as proof of concept and a first signal to identify potential founder variants. Sanger confirmation and cohort expansion will be critical. Authors rightly emphasize these results should not be used clinically without confirmation.

Clinical impact: 2/3 · Evidence strength: 1/3 · Novelty: 2/2 · Sample size: 0/1 · Journal quality: 0/1 · Preprint: -1 → Total: 4/10