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Neurology. 1992 Feb;42(2):431-3.

Linkage of atypical myotonia congenita to a sodium channel locus.

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  • 1Department of Neurology, University of Utah School of Medicine, Salt Lake City 84132.


We performed linkage analysis in a pedigree segregating an allele for autosomal dominant, painful myotonia that is potassium sensitive and responsive to acetazolamide. This allele was tightly linked to a skeletal-muscle, sodium channel locus which is now a candidate for the site of the mutational defect in acetazolamide-responsive myotonia congenita. Since this sodium channel locus is completely linked to the disease allele in all hyperkalemic periodic paralysis and paramyotonia congenita pedigrees studied, the molecular alteration causing acetazolamide-responsive myotonia congenita is likely an allelic defect in this human, skeletal-muscle, sodium channel gene.

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