Alternative titles and symbols : Williams distal myopathy;
Description : Williams distal myopathy is an autosomal dominant slowly progressive muscular disorder
characterized by distal muscle weakness and atrophy affecting the upper and lower
limbs. Onset occurs around the third to fourth decades of life, and patients remain
ambulatory even after long disease duration. Muscle biopsy shows nonspecific changes
with no evidence of rods, necrosis, or inflammation (summary by Duff et al., 2011).
Mutation in the FLNC gene can also cause myofibrillar myopathy-5 (MFM5; 609524), which
shows a different pattern of muscle involvement and different histologic changes.;
Inheritance : Autosomal dominant;
Molecular basis : Caused by mutation in the filamin C gene (FLNC, 102565.0003);
Laboratory abnormalities : Normal or mildly increased serum creatine kinase;