Novel missense mutation in the early growth response 2 gene associated with Dejerine-Sottas syndrome phenotype.

Abstract:

BACKGROUND:Mutations in the early growth response 2 (EGR2) gene have recently been found in patients with congenital hypomyelinating neuropathy and Charcot-Marie-Tooth type 1 (CMT1) disease. OBJECTIVE:To determine the frequency of EGR2 mutations in patients with a diagnosis of CMT1, Dejerine-Sottas syndrome (DSS), or unspecified peripheral neuropathies. METHODS:Fifty patients and 70 normal control subjects were screened. RESULTS:A de novo missense mutation (Arg359Trp) in the alpha-helix of the first zinc-finger domain of the EGR2 transcription factor was identified in a patient diagnosed with a clinical phenotype consistent with DSS. This patient had a motor median nerve conduction velocity of 8 m/s. A sural nerve biopsy showed a severe loss of myelinated and unmyelinated fibers, evidence for demyelination, numerous classic onion bulbs, and focally folded myelin sheaths. DSS is a severe, childhood-onset demyelinating peripheral neuropathy initially thought to be inherited as an autosomal recessive trait. However, several dominant heterozygous mutations in the peripheral myelin protein 22 (PMP22) gene and dominant mutations in the peripheral myelin protein zero (MPZ) gene, both in the heterozygous and homozygous state, have been reported in patients with DSS. CONCLUSIONS:Hereditary peripheral neuropathies represent a spectrum of disorders due to underlying defects in myelin structure or formation.

journal_name

Neurology

journal_title

Neurology

authors

Timmerman V,De Jonghe P,Ceuterick C,De Vriendt E,Löfgren A,Nelis E,Warner LE,Lupski JR,Martin JJ,Van Broeckhoven C

doi

10.1212/wnl.52.9.1827

subject

Has Abstract

pub_date

1999-06-10 00:00:00

pages

1827-32

issue

9

eissn

0028-3878

issn

1526-632X

journal_volume

52

pub_type

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