Muscle fiber-type distribution, fiber-type-specific damage, and the Pompe disease phenotype

L. E. van den Berg, M.R. Drost, G. Schaart, J. de Laat, P.A. van Doorn, A.T. van der Ploeg, A.J. Reuser

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6 Citations (Scopus)

Abstract

Pompe disease is a lysosomal storage disorder caused by acid alpha-glucosidase deficiency and characterized by progressive muscle weakness. Enzyme replacement therapy (ERT) has ameliorated patients' perspectives, but reversal of skeletal muscle pathology remains a challenge. We studied pretreatment biopsies of 22 patients with different phenotypes to investigate to what extent fiber-type distribution and fiber-type-specific damage contribute to clinical diversity. Pompe patients have the same fiber-type distribution as healthy persons, but among nonclassic patients with the same GAA mutation (c.-32-13T>G), those with early onset of symptoms tend to have more type 2 muscle fibers than those with late-onset disease. Further, it seemed that the older, more severely affected classic infantile patients and the wheelchair-bound and ventilated nonclassic patients had a greater proportion of type 2x muscle fibers. However, as in other diseases, this may be caused by physical inactivity of those patients.
Original languageEnglish
Pages (from-to)787-794
JournalJournal of Inherited Metabolic Disease
Volume36
Issue number5
DOIs
Publication statusPublished - 1 Jan 2013

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