Spheroid body myopathy (SBM) is a rare autosomal dominant neuromuscular disorder characterized by slowly progressing proximal muscle weakness and dysarthric nasal speech. The unique feature noted pathologically was the spheroid bodies found within the type I muscle fibers. SBM is caused by mutations in TTID/ MYOT. Myotilin induces actin filament bundling and stabilizes the assembled bundles.
Category
Nervous system disease; Musculoskeletal disease
Brite
Human diseases in ICD-11 classification [BR:br08403]
08 Diseases of the nervous system
Diseases of neuromuscular junction or muscle
Primary disorders of muscles
8C72 Congenital myopathies
H01291 Spheroid body myopathy
