Characterizing intragenic duplication breakpoints in a triple-negative breast cancer case using long-read sequencing.

Front Oncol

Laboratoire de Biologie des Tumeurs Solides, Département de Pathologie et Oncobiologie, Centre Hospitalier Universitaire (CHU) Montpellier, Université de Montpellier, Montpellier, France.

Published: February 2024


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Article Abstract

Introduction: Accurate identification and characterization of Large Genomic Rearrangements (LGR), especially duplications, are crucial for precise diagnosis and risk assessment. In this report, we characterized an intragenic duplication breakpoint of to determine its pathogenicity significance.

Methods: A 52-year-old female with triple-negative breast cancer was diagnosed with a novel LGR. An efficient and accurate methodology was applied, combining long-read sequencing and transcript analysis for the rapid characterization of the duplication.

Results: Duplication of exons 5 and 6 of was validated by transcript analysis. Long-read sequencing enabled the localization of breakpoints within elements, providing insights into the mechanism of duplication via non-allelic homologous recombination.

Conclusion: Using our combined methodology, we reclassified the duplication as a pathogenic variant. This reclassification suggests a possible causative link between this specific genetic alteration and the aggressive phenotype of the patient.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10938850PMC
http://dx.doi.org/10.3389/fonc.2024.1355715DOI Listing

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