A founder BRCA1 exonic duplication involving breakpoint in T2T reference genome-specific region results in constitutional fusion transcript.

ABSTRACT: Pathogenicity assessment of genetic variants is the cornerstone of genetic counselling. Copy gains of exons are challenging, as pathogenicity depends on the localization of the additional exons. Eight patients form six families carried copy gains of BRCA1 exons 8-20. For appropriate characterization, long-read sequencing aligned on three distinct reference genome assemblies, optical genomic mapping, short-read and long-read RNA sequencing were performed. All patients shared the same pathogenic structural variant, involving a large segment located downstream in the genome. One breakpoint occurred in a region incorrectly annotated in GRCh37/hg19 and GRCh38/hg38. Alignment to the T2T-CHM13/hs1 assembly was therefore necessary for accurate characterization. This rearrangement caused various BR

SUBMITTER: Schwartz M 

PROVIDER: S-EPMC12314049 | biostudies-literature | 2025 Jul

REPOSITORIES: biostudies-literature