Exacerbation of Charcot-Marie-tooth disease in pregnancy.
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A European collaboration on Charcot-Marie-Tooth type 1 (CMT1) disease and hereditary neuropathy with liability to pressure palsies (HNPP) was established to estimate the duplication and deletion frequency, respectively, on chromosome 17p11.2 and to make an inventory of mutations in the myelin genes, peripheral myelin protein 22 (PMP22), myelin protein zero (MPZ) and connexin 32 (Cx32) located on chromosomes 17p11.2, 1q21-q23 and Xq13.1, respectively. In 70.7% of 819 unrelated CMT1 patients, the 17p11.2 duplication was present. In 84.0% of 156 unrelated HNPP patients, the 17p11.2 deletion was present. In the nonduplicated CMT1 patients, several different mutations were identified in the myelin genes PMP22, MPZ and Cx32.
Mutation of the myelin protein zero (MPZ) gene is associated with a small number of Charcot-Marie-Tooth (CMT) patients. We present a patient with Lys 130 Arg substitution in the extracellular domain who showed tomacula formation in biopsied sural nerve. CMT patients with mutations Ly 96 Glu, Lys 130 Arg and Ile 135 Leu showed tomaculous neuropathy. Present and previously reported investigations suggest that the pathological phenotypes of peripheral nerve are probably related to the mutations of the MPZ gene.
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We have recently demonstrated tight linkage of the Duffy blood group marker to the alpha-spectrin gene in an extended pedigree with Charcot-Marie-Tooth neuropathy. To determine a more precise location of the Duffy blood group locus on the chromosome 1 map we have tested several more chromosome 1 genes for linkage with this marker. We found suggestive linkage with the antithrombin III and apolipoprotein A2 genes and conclusive linkage with the gene coding for beta-nerve growth factor.
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