Human sodium channel gating defects caused by missense mutations in S6 segments associated with myotonia: S804F and V1293I.

Abstract excerpt

1. Missense mutations in the alpha-subunit of the human skeletal muscle sodium channel (hSkM1) have been detected in some heritable forms of myotonia. By recording Na+ currents from cells transfected with cDNA encoding either wild-type or mutant hSkM1, we characterized the functional consequences of two myotonia-associated mutations that lie at the cytoplasmic end of the sixth transmembrane segment in domain II...

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