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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Skeletal muscle dihydropyridine-sensitive calcium channel (CACNA1S) gene mutations in chinese patients with hypokalemic periodic paralysis.

BACKGROUND: Thyrotoxic periodic paralysis (TPP), familial periodic paralysis (FPP), and sporadic periodic paralysis (SPP) are common causes of hypokalemic periodic paralysis and have similar clinical presentations, thus possibly sharing the identical mutations. METHODS: We analyzed the role of the three known CACNA1S gene mutations (R528H, R1239H, and R1239G) in Chinese patients, including two FPP families, 36 TPP patients, 12 SPP patients, and their relatives. Fifty unrelated healthy subjects were also studied. Genomic DNA was prepared from the peripheral blood of all patients, their family members, and healthy subjects. Mutations of the CACNA1S gene were screened using polymerase chain reaction-based restriction analysis. RESULTS: Two FPP families had the R528H point mutation, but with incomplete penetrance occurring more commonly in men than in women. Only one SPP patient had a de novo mutation (R528H). None of the TPP patients had mutations in the three hot spots. CONCLUSION: Patients with FPP have R528H mutations in the CACNA1S gene. Only a few patients with SPP may share similar mutations with FPP. TPP patients do not carry any of the three known gene mutations.[1]


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