[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.


CONCLUSIONS
The mutation V781I exists in Chinese patients with normoKPP and may be responsible for normoKPP.
Guo
Xiu-hai
XH
The Department of Neurology, the General Hospital of PLA, Beijing, 100853 P. R. China.
Wu
Wei-ping
WP
Zhang
Yan-hua
YH
Jia
Jian-ping
JP
Zhu
Ke
K
D000328:Adult; D000595:Amino Acid Sequence; D001483:Base Sequence; D002648:Child; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D004247:DNA / Q000032:analysis / Q000235:genetics; D005091:Exons; D005260:Female; D006801:Humans; D008297:Male; D008969:Molecular Sequence Data; D020125:Mutation, Missense; D062553:NAV1.4 Voltage-Gated Sodium Channel; D010245:Paralyses, Familial Periodic / Q000235:genetics*; D017354:Point Mutation; D017422:Sequence Analysis, DNA; D015222:Sodium Channels / Q000235:genetics*
D062553:NAV1.4 Voltage-Gated Sodium Channel; C106251:SCN4A protein, human; D015222:Sodium Channels; D004247:DNA