The clinical value of optical genome mapping in the rapid characterization of RB1 duplication and 15q23q24.2 triplication, for more appropriate prenatal genetic counselling - UNICANCER Access content directly
Journal Articles Molecular Genetics and Genomic Medicine Year : 2024

The clinical value of optical genome mapping in the rapid characterization of RB1 duplication and 15q23q24.2 triplication, for more appropriate prenatal genetic counselling

Abstract

Molecular Genetics & Genomic Medicine published by Wiley Periodicals LLC.Background: Despite recent advances in prenatal genetic diagnosis, medical geneticists still face considerable difficulty in interpreting the clinical outcome of copy-number-variant duplications and defining the mechanisms underlying the formation of certain chromosomal rearrangements. Optical genome mapping (OGM) is an emerging cytogenomic tool with proved ability to identify the full spectrum of cytogenetic aberrations. Methods: Here, we report on the use of OGM in a prenatal diagnosis setting. Detailed breakpoint mapping was used to determine the relative orientations of triplicated and duplicated segments in two unrelated foetuses harbouring chromosomal aberrations: a de novo 15q23q24.2 triplication and a paternally inherited 13q14.2 duplication that overlapped partially with the RB1 gene. Results: OGM enabled us to suggest a plausible mechanism for the triplication and confirmed that the RB1 duplication was direct oriented and in tandem. This enabled us to predict the pathogenic consequences, refine the prognosis and adapt the follow-up and familial screening appropriately. Conclusion: Along with an increase in diagnostic rates, OGM can rapidly highlight genotypeu2013phenotype correlations, improve genetic counselling and significantly influence prenatal management.
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hal-04615294 , version 1 (19-06-2024)

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Malek Bouassida, Denise Molina-Gomes, Fairouz Koraichi, Bérénice Hervé, Morgane Lhuilier, et al.. The clinical value of optical genome mapping in the rapid characterization of RB1 duplication and 15q23q24.2 triplication, for more appropriate prenatal genetic counselling. Molecular Genetics and Genomic Medicine, 2024, 12 (4), ⟨10.1002/mgg3.2437⟩. ⟨hal-04615294⟩
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