Abstract:
OBJECTIVE:To characterize a kindred with a distinctive autosomal dominant neuromuscular disorder. BACKGROUND:The authors studied a large Italian family affected by a progressive neuromyopathy. Ten individuals over three generations were affected. The disease was characterized by onset from the late teens to early 50s with distal leg weakness and atrophy, development of generalized muscle weakness with distal-to-proximal progression sparing facial and ocular muscles, dysphonia and dysphagia, pes cavus and areflexia, variable clinical expression ranging from subclinical myopathy to severely disabling weakness, and mixed neurogenic and myopathic abnormalities on electromyography. METHODS:Morphologic, immunocytochemical, and ultrastructural studies were performed in muscle biopsies from three affected patients. A genomewide linkage analysis through the genotyping of 292 microsatellite markers spanning the 22 autosomes was undertaken to map the disorder segregating in this family. RESULTS:All muscle biopsies showed variation of fiber size, panesterase-positive angular fibers, mild to severe fibrosis, and numerous "rimmed vacuoles." Electron microscopy failed to demonstrate the nuclear or cytoplasmic filamentous inclusions specific of inclusion-body myopathies and, accordingly, immunohistochemistry did not show any positivity with SMI-31 antibodies detecting hyperphosphorylated tau. Preliminary analysis of 292 microsatellite markers provided evidence for linkage to chromosome 19p13. CONCLUSIONS:This distinctive autosomal dominant disorder is characterized by a vacuolar neuromyopathy. Localization to chromosome 19p13 will allow the genetic relationship between this disease and inherited myopathies with rimmed vacuoles, in particular autosomal dominant inclusion-body myopathies, to be defined.
journal_name
Neurologyjournal_title
Neurologyauthors
Servidei S,Capon F,Spinazzola A,Mirabella M,Semprini S,de Rosa G,Gennarelli M,Sangiuolo F,Ricci E,Mohrenweiser HW,Dallapiccola B,Tonali P,Novelli Gdoi
10.1212/wnl.53.4.830subject
Has Abstractpub_date
1999-09-11 00:00:00pages
830-7issue
4eissn
0028-3878issn
1526-632Xjournal_volume
53pub_type
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