Highly Sensitive Detection Method of Retinoblastoma Genetic Predisposition and Biomarkers

Retinoblastoma is a malignant tumor of the infant retina. Nearly half of patients are predisposed to retinoblastoma by a germline RB1 pathogenic variant. Nonhereditary retinoblastoma is mainly caused by inactivation of both RB1 alleles at a somatic level. Several polymorphisms have been reported as...

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Bibliographic Details
Published in:The Journal of molecular diagnostics : JMD 2021-12, Vol.23 (12), p.1714-1721
Main Authors: Le Gall, Jessica, Dehainault, Catherine, Benoist, Camille, Matet, Alexandre, Lumbroso-Le Rouic, Livia, Aerts, Isabelle, Jiménez, Irene, Schleiermacher, Gudrun, Houdayer, Claude, Radvanyi, François, Frouin, Eleonore, Renault, Victor, Doz, François, Stoppa-Lyonnet, Dominique, Gauthier-Villars, Marion, Cassoux, Nathalie, Golmard, Lisa
Format: Article
Language:English
Subjects:
Aqueous Humor - physiology
Biomarkers, Tumor - blood
Biomarkers, Tumor - genetics
Child
Child, Preschool
Female
Genetic Predisposition to Disease
High-Throughput Nucleotide Sequencing
Humans
Infant
Loss of Heterozygosity
Male
Polymorphism, Single Nucleotide
Retinal Neoplasms - genetics
Retinoblastoma - genetics
Retinoblastoma Binding Proteins - genetics
Ubiquitin-Protein Ligases - genetics
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Summary:Retinoblastoma is a malignant tumor of the infant retina. Nearly half of patients are predisposed to retinoblastoma by a germline RB1 pathogenic variant. Nonhereditary retinoblastoma is mainly caused by inactivation of both RB1 alleles at a somatic level. Several polymorphisms have been reported as biomarkers of retinoblastoma risk, aggressiveness, or invasion. The most informative genetic testing is obtained from tumor DNA. Historically, access to tumor DNA has been warranted by the frequent indication of enucleation, which has decreased because of advances in conservative approaches. Recent studies showed that tumor cell-free DNA can be analyzed in aqueous humor from retinoblastoma patients. This report describes a next-generation sequencing method relying on unique molecular identifiers for a highly sensitive detection of retinoblastoma genetic predisposition and biomarkers in a single analysis. It is the first use of unique molecular identifiers for retinoblastoma genetics. This gene panel enables the detection of RB1 point variants, large genome rearrangements, and loss of heterozygosity. It is adapted for genomic DNA extracted from blood or tumor DNA extracted from tumor fragment, aqueous humor, or plasma. The access to tumor cell-free DNA improves the diagnosis of genetic predisposition in case of conservative ocular therapy and provides access to biomarkers guiding the treatment strategy. The analysis of a gene panel is cost-effective and can be easily implemented in diagnostic laboratories.
ISSN:1525-1578
1943-7811
DOI:10.1016/j.jmoldx.2021.08.014