A new muscle glycogen storage disease associated with glycogenin-1 deficiency

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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Edoardo Malfatti, Johanna Nilsson, Carola Hedberg-Oldfors, Aurelio Hernandez-Lain, Fabrice Michel, et al.. A new muscle glycogen storage disease associated with glycogenin-1 deficiency. Annals of Neurology, Wiley, 2014, 76 (6), pp.891 - 898. ⟨10.1002/ana.24284⟩. ⟨hal-01699463⟩

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