Hypokalemic periodic paralysis (HPP) is a rare disease characterized by reversible attacks of muscle weakness accompanied by episodic hypokalemia. The most common causes of HPP are familial periodic paralysis (FPP), thyrotoxic periodic paralysis (TPP) and sporadic periodic paralysis (SPP), respectively. Recent molecular work has revealed that the majority of FPP and SPP is due to mutations in a skleletal muscle voltage-dependent calcium-channel: dihydropyridin receptor. We report a 13-yr- old boy with HPP. Genetic examination identified a mutation of nucleotide 1239 R (arginine) to H (histidine) in exon 30 of the calcium-channel gene, CACNA1S. This boy is the first case of HPP in whom CACNA1S mutation is reported from Turkey
Keywords: Hypokalemic periodic paralysis, voltage dependent calcium channel mutation, dyhidropyridine receptor, Turkey