Charcot-Marie-Tooth (CMT) disease is the most frequent inherited peripheral motor and sensory neuropathy characterised by chronic distal weakness with progressive muscular atrophy and sensory loss of the distal extremities. The dominant form of the disease is genetically heterogeneous but only one locus has been identified on chromosome 8q13-q21.1 for autosomal recessive CMT. By homozygosity mapping in a large Algerian kindred, we have assigned a second locus for autosomal recessive CMT to chromosome 5q23-33. Linkage analysis demonstrated that the same locus is involved in a second Algerian family with a demyelinating CMT. Haplotype reconstruction and determination of the minimal region of homozygosity restricts the candidate region to a 4 cM interval.
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