A new muscle glycogen storage disease associated with glycogenin-1 deficiency.
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Malfatti E, Nilsson J, Hedberg-Oldfors C, Hernandez-Lain A, Michel F, Dominguez-Gonzalez C, Viennet G, Akman HO, Kornblum C, Van den Bergh P, Romero NB, Engel AG, DiMauro S, Oldfors A
A new muscle glycogen storage disease associated with glycogenin-1 deficiency.
Ann Neurol. 2014 Dec;76(6):891-8. doi: 10.1002/ana.24284. Epub 2014 Oct 31.
- PubMed ID
- 25272951 [ View in PubMed]
- 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.