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Comparative Study
, 83 (3), 276-9

Glycogen Storage Disease Type Ia in Argentina: Two Novel glucose-6-phosphatase Mutations Affecting Protein Stability

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Comparative Study

Glycogen Storage Disease Type Ia in Argentina: Two Novel glucose-6-phosphatase Mutations Affecting Protein Stability

Celia J Angaroni et al. Mol Genet Metab.

Abstract

Glycogen storage disease type Ia (GSD-Ia) is caused by deleterious mutations in the glucose-6-phosphatase gene (G6PC). A molecular study of this gene was carried out in 11 Argentinean patients from 8 unrelated families. Four missense (p.Gln54Pro, p.Arg83Cys, p.Thr16Arg, and p.Tyr209Cys) and one deletion (c.79delC) mutations have been identified. Two novel mutations, p.Thr16Arg (c.47C>G) located within the amino-terminal domain and p.Tyr209Cys (c.626A>G) situated in the sixth transmembrane helix, were uncovered in this study. Site-directed mutagenesis and transient expression assays demonstrated that both p.Thr16Arg and p.Tyr209Cys mutations abolished enzymatic activity as well as reduced G6Pase stability.

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