2014 · ANNALS OF NEUROLOGY

A New Muscle Glycogen Storage Disease Associated with Glycogenin-1 Deficiency

Malfatti, Edoardo, Nilsson, Johanna, Hedberg-Oldfors, Carola, Hernandez-Lain, Aurelio, Michel, Fabrice, Dominguez-Gonzalez, Cristina, Viennet, Gabriel, Akman, H. Orhan, Kornblum, Cornelia, Van den Bergh, Peter, Romero, Norma B., Engel, Andrew G., DiMauro, Salvatore, Oldfors, Anders

Journal: ANNALS OF NEUROLOGY
Année: 2014
Volume: 76
Numéro: 6
Pages: 891-898
Mois: DEC
DOI: 10.1002/ana.24284

Abstract

We describe a slowly progressive myopathy in 7 unrelated adult patients with storage of polyglucosan in muscle fibers. Genetic investigation revealed homozygous or compound heterozygous deleterious variants in the glycogenin-1 gene (GYG1). Most patients showed depletion of glycogenin-1 in skeletal muscle, whereas 1 showed presence of glycogenin-1 lacking the C-terminal that normally binds glycogen synthase. Our results indicate that either depletion of glycogenin-1 or impaired interaction with glycogen synthase underlies this new form of glycogen storage disease that differs from a previously reported patient with GYG1 mutations who showed profound glycogen depletion in skeletal muscle and accumulation of glycogenin-1. Ann Neurol 2014;76:891-898

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