Dejerine-Sottas disease with sensorineural hearing loss, nystagmus, and peripheral facial nerve weakness: de novo dominant point mutation of the PMP22 gene.
A 32 year old woman with Dejerine-Sottas disease and negative family history is reported. Clinical onset of her condition was with congenital weakness of her distal four extremities, accompanied by peripheral facial nerve weakness, deafness, and nystagmus. She has used a wheelchair all her life. Sural nerve biopsy showed proliferation of Schwann cells, extensive endoneural fibrosis, axon loss, and demyelination. MNCVs showed marked slowing. MRI of the brain was normal. Molecular genetic studies indicated a de novo dominant missense point mutation of exon 3 of the peripheral myelin protein 22 gene at nucleotide 264 causing replacement of serine with leucine.
Ionasescu
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VV
Department of Pediatrics, University of Iowa Hospitals and Clinics, Iowa City 52242, USA.
Searby
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C
Greenberg
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SA
D000328:Adult; D005154:Facial Nerve / Q000503:physiopathology; D005260:Female; D005799:Genes, Dominant / Q000235:genetics; D006319:Hearing Loss, Sensorineural / Q000235:genetics; D015417:Hereditary Sensory and Motor Neuropathy / Q000235:genetics* / Q000503:physiopathology; D006801:Humans; D009185:Myelin Proteins / Q000235:genetics*; D009759:Nystagmus, Pathologic / Q000235:genetics; D010523:Peripheral Nervous System Diseases / Q000235:genetics / Q000503:physiopathology; D017354:Point Mutation / Q000235:genetics*
D009185:Myelin Proteins; C073687:PMP22 protein, human