Human Molecular Genetics, Vol 5, 1051-1054, Copyright © 1996 by Oxford University Press
A Bolino, V Brancolini, F Bono, A Bruni, A Gambardella, G Romeo, A Quattrone and M Devoto
Hereditary motor and sensory neuropathy (HMSN) with focally folded myelin
sheaths, or Charcot-Marie-Tooth type 4B (CMT4B), is a distinct clinical
entity belonging to the heterogeneous group of autosomal recessive
demyelinating neuropathies. We first described a large pedigree with CMT4B,
which showed a high consanguinity level and an autosomal recessive pattern
of inheritance. Through conventional linkage analysis, we excluded linkage
of the locus segregating in this pedigree to any of the known genes
responsible for other HMSNs. Using homozygosity mapping and haplotype
sharing analysis, we were able to localize the disease gene in a 4 cM
interval on chromosome 11q23, between the D11S1332 and D11S917 loci. On the
basis of the clinical characteristics of the disease, we propose that this
locus corresponds to the CMT4B gene.
ARTICLES
Localization of a gene responsible for autosomal recessive demyelinating neuropathy with focally folded myelin sheaths to chromosome 11q23 by homozygosity mapping and haplotype sharing
Laboratorio di Genetica Molecolare, Istituto Gaslini, Genova, Italy.
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