Novel GNE mutations in two phenotypically distinct HIBM2 patients.
Homozygous mutations in the UDP-N-acetylglucosamine 2-epimerase/N-acetylmannosamine kinase (GNE) gene cause hereditary inclusion body myopathy type 2 (HIBM2). We describe two unrelated American patients with novel GNE mutations. While one patient followed a typical disease course for HIBM2 with an onset at age 25 and rimmed vacuole pathology on muscle biopsy, the second patient had several features atypical for HIBM2. This patient's onset was at age 55, included distal weakness, quadriceps sparing and respiratory insufficiency. His muscle biopsy showed prominent necrosis without rimmed vacuoles. This study expands the phenotype and illustrates the clinical spectrum of HIBM2 identified in a U.S. based neuromuscular clinic.
Department of Neurology and Hope Center for Neurological Disorders, Washington University School of Medicine, 660 S. Euclid Avenue, Saint Louis, MO 63110, USA. weihlc@neuro.wustl.edu
Conrad C
CC
Weihl
Sara E
SE
Miller
Craig M
CM
Zaidman
Alan
A
Pestronk
Robert H
RH
Baloh
Mohammed
M
Al-Lozi
D000368:Aged; D001706:Biopsy; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009097:Multienzyme Complexes / Q000235:genetics*; D018908:Muscle Weakness / Q000473:pathology; D018482:Muscle, Skeletal / Q000473:pathology; D020125:Mutation, Missense / Q000235:genetics*; D018979:Myositis, Inclusion Body / Q000151:congenital / Q000175:diagnosis / Q000235:genetics / Q000473:pathology; D010641:Phenotype; D012131:Respiratory Insufficiency / Q000473:pathology
D009097:Multienzyme Complexes; C482901:UDP-N-acetylglucosamine 2-epimerase - N-acetylmannosamine kinase