Classification of PTEN germline non-truncating variants: a new approach to interpretation
MARGOT, Henri
Service de génétique médicale
Centre Hospitalier Universitaire de Bordeaux [CHU Bordeaux]
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Service de génétique médicale
Centre Hospitalier Universitaire de Bordeaux [CHU Bordeaux]
MARGOT, Henri
Service de génétique médicale
Centre Hospitalier Universitaire de Bordeaux [CHU Bordeaux]
Service de génétique médicale
Centre Hospitalier Universitaire de Bordeaux [CHU Bordeaux]
LONGY, Michel
Institut Bergonié [Bordeaux]
Département de pathologie
Plateforme de génétique moléculaire des cancers d'Aquitaine
Actions for OnCogenesis understanding and Target Identification in ONcology [ACTION]
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Institut Bergonié [Bordeaux]
Département de pathologie
Plateforme de génétique moléculaire des cancers d'Aquitaine
Actions for OnCogenesis understanding and Target Identification in ONcology [ACTION]
Langue
EN
Article de revue
Ce document a été publié dans
Journal of Medical Genetics. 2024-10-02, vol. 61, n° 12, p. 1071-1079
Résumé en anglais
PTEN hamartoma tumour syndrome (PHTS) encompasses distinct syndromes, including Cowden syndrome resulting from pathogenic variants. Missense variants account for 30% of PHTS cases, but their classification remains ...Lire la suite >
PTEN hamartoma tumour syndrome (PHTS) encompasses distinct syndromes, including Cowden syndrome resulting from pathogenic variants. Missense variants account for 30% of PHTS cases, but their classification remains challenging. To address these difficulties, guidelines were published by the Clinical Genome Resource PTEN Variant Curation Expert Panel. Between 2010 and 2020, the Bergonie Institute reference laboratory identified 76 different non-truncating variants in 166 patients, 17 of which have not previously been reported. Variants were initially classified following the current guidelines. Subsequently, a new classification method was developed based on four main criteria: functional exploration, phenotypic features and familial segregation, in silico modelling, and allelic frequency. This new method of classification is more discriminative and reclassifies 25 variants, including 8 variants of unknown significance. This report proposes a revision of the current variant classification criteria which at present rely on functional tests evaluating only the phosphatase activity of PTEN and apply a particularly stringent clinical PHTS score.The classification of non-truncating variants of is facilitated by taking into consideration protein stability for variants with intact phosphatase activity, clinical and segregation criteria adapted to the phenotypic variability of PHTS and by specifying the allelic frequency of variants in the general population. This novel method of classification remains to be validated in a prospective cohort.< Réduire
Mots clés en anglais
Genetic Predisposition to Disease
Genetics
Medical
Mutation
Missense
Unités de recherche