Somatic loss of an EXT2 gene mutation during malignant progression in a patient with hereditary multiple osteochondromas

Cancer Genetics
Nicolò MussoDaniele Filippo Condorelli

Abstract

Multiple osteochondromas (MO) is an autosomal-dominant skeletal disorder caused by mutations in the exostosin-1 (EXT1) or exostosin-2 (EXT2) genes. In this study, we report the analysis of the mutational status of the EXT2 gene in tumor samples derived from a patient affected by hereditary MO, documenting the somatic loss of the germline mutation in a giant chondrosarcoma and in a rapidly growing osteochondroma. The sequencing of all exons and exon-intron junctions of the EXT1 and EXT2 genes from blood DNA of the proband did not reveal any mutation in the EXT1 gene but did demonstrate the presence of the transition point mutation c.67C > T in the EXT2 gene, determining the introduction of a stop codon in the coding sequence (p.Arg23*). A mutational analysis of other members of the family and the presence of osteochondromas in the metaphysis of long bones confirmed the diagnosis of hereditary multiple osteochondromas. Direct sequencing from DNA extracted from different sites of two tumor samples (a small rapidly growing osteochondroma and a giant peripheral secondary chondrosarcoma, each located at different chondrocostal junctions) revealed the loss of the germline EXT2 mutation. Analysis of microsatellite polymorphic markers i...Continue Reading

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Citations

Oct 26, 2016·Genes, Chromosomes & Cancer·Abdelkader HeddarIsabelle Tournier
Apr 4, 2019·Journal of Inherited Metabolic Disease·Jenny Serra-VinardellDaniel Grinberg
Dec 15, 2017·Calcified Tissue International·Hannah K BrownDominique Heymann
Jul 3, 2021·Diagnostics·Nicolò MussoCristoforo Pomara

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