ArticleMolecular genetics & genomic medicine2020
From a variant of unknown significance to pathogenic: Reclassification of a large novel duplication in BRCA2 by high-throughput sequencing.
Article in Molecular genetics & genomic medicine, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
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5 citing papers in PubMed.
- Clinical utility of periodic reinterpretation of CNVs of uncertain significance: an 8-year retrospective study.Genome medicine · 2023Article
- A NovelHuman mutation · 2023Article
- Genomic Breakpoints' Characterization of a LargeDiagnostics (Basel, Switzerland) · 2022Article
- Germline Structural Variations in Cancer Predisposition Genes.Frontiers in genetics · 2021Review
- From a variant of unknown significance to pathogenic: Reclassification of a large novel duplication in BRCA2 by high-throughput sequencing.Molecular genetics & genomic medicine · 2020Article
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10 authors.
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Abstract
backgroundGermline mutations in BRCA1/2 significantly contribute to hereditary breast and/or ovarian cancer. Here, we report a novel BRCA2 duplication of exons 22-24 in a female patient with bilateral breast cancer at age 35 and 44. The duplicated region was initially detected by gene panel sequencing and multiplex ligation-dependent probe amplification. However, the location and orientation of the duplicated region was unknown. Therefore, it was initially classified as a variant of unknown significance.
methodsThe spatial directional characterization of the BRCA2 duplication was achieved by targeted enrichment of the whole-genomic BRCA2 locus including exons and introns, and subsequent high-throughput sequencing. Subsequently, bioinformatics tools and a breakpoint-spanning PCR were used for identification of location and orientation of the duplication.
resultsThe duplicated region was arranged in tandem and direct orientation (Chr13(GRCh37):g.32951579_32960394dup; NM_000059.3 c.8754 + 651_9256+6112dup p.(Ala3088Phefs*3)). It is predicted to result in a frameshift and a premature stop codon likely triggering nonsense-mediated mRNA decay. Consequently, it is regarded as pathogenic.
conclusionThis case study demonstrates that a comprehensive characterization of a structural variant by breakpoint assessment is crucial for its correct classification. Therefore, sequencing strategies including non-coding regions might be necessary to identify cancer predispositions in affected families.
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