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CASE REPORTS
JOURNAL ARTICLE
RESEARCH SUPPORT, N.I.H., EXTRAMURAL
RESEARCH SUPPORT, NON-U.S. GOV'T
The R900S mutation in CACNA1S associated with hypokalemic periodic paralysis.
Neuromuscular Disorders : NMD 2015 December
Primary hypokalemic periodic paralysis is an autosomal dominant skeletal muscle channelopathy. In the present study, we investigated the genotype and phenotype of a Chinese hypokalemic periodic paralysis family. We used whole-exome next-generation sequencing to identify a mutation in the calcium channel, voltage-dependent, L type, alpha subunit gene (CACNA1S), R900S, which is a rare mutation associated with hypokalemic periodic paralysis. We first present a clinical description of hypokalemic periodic paralysis patients harboring CACNA1SR900S mutations: they were non-responsive to acetazolamide, but combined treatment with triamterene and potassium supplements decreased the frequency of muscle weakness attacks. All male carriers of the R900S mutation experienced such attacks, but all three female carriers were asymptomatic. This study provides further evidence for the phenotypic variation and pharmacogenomics of hypokalemic periodic paralysis.
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