[The mutation V781I in SCN4A gene exists in Chinese patients with normokalemic periodic paralysis].

OBJECTIVE

In this report are reviewed two unrelated patients with typical normokalemic periodic paralysis (normoKPP) features and the results of screening the SCN4A gene for the disease-related mutation.

METHODS

Two sporadic cases with normoKPP were screened for previously known mutations in SCN4A gene (T704M, A1156T, M1360V, I1495F, M1592V) that lead to hyperKPP; denaturing high performance liquid chromatography (DHPLC) was used. Then the rest exons of SCN4A gene were screened by DHPLC, and sequence analysis was performed on those with DHPLC chromatogram variation when compared with unaffected control.

RESULTS

Two cases and one patient's father were detected with V781I, which was proved to be a singular missense mutation in SCN4A gene.

CONCLUSION

The mutation V781I exists in Chinese patients with normoKPP and may be responsible for normoKPP.