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

    Linkage of atypical myotonia congenita to a sodium channel locus.

    Ptacek LJ, Tawil R, Griggs RC, Storvick D, Leppert M.

    Department 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.

    PMID: 1310531 [PubMed - indexed for MEDLINE]

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