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Lookup NU author(s): Dr Katherine Johnson,
Dr Ana Topf,
Professor Volker Straub
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© 2017 Elsevier B.V. Defects of O-linked glycosylation of alpha-dystroglycan cause a wide spectrum of muscular dystrophies ranging from severe congenital muscular dystrophy associated with abnormal brain and eye development to mild limb girdle muscular dystrophy. We report a female patient who developed isolated pelvic girdle muscle weakness and wasting, which became symptomatic at age 42. Exome sequencing uncovered a homozygous c.131T > G (p.Leu44Pro) substitution in DPM3, encoding dolichol-P-mannose (DPM) synthase subunit 3, leading to a 50% reduction of enzymatic activity. Decreased availability of DPM as an essential donor substrate for protein O-mannosyltransferase (POMT) 1 and 2 explains defective skeletal muscle alpha-dystroglycan O-glycosylation. Our findings show that DPM3 mutations may lead to an isolated and mild limb girdle muscular dystrophy phenotype without cardiomyopathy.
Author(s): Van den Bergh PYK, Sznajer Y, Van Parys V, van Tol W, Wevers RA, Lefeber DJ, Xu L, Lek M, MacArthur DG, Johnson K, Phillips L, Topf A, Straub V
Publication type: Article
Publication status: Published
Journal: Neuromuscular Disorders
Online publication date: 17/07/2017
Acceptance date: 12/07/2017
ISSN (print): 0960-8966
ISSN (electronic): 1873-2364
Publisher: Elsevier Ltd
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