Mutations in the PRRT2 gene were mainly associated with paroxysmal kinesigenic dyskinesia with a number of associated phenotypes (Table 1) including: (i) episodic ataxia; (ii) benign epilepsy; (iii) PED; and (iv) migraine and familial hemiplegic migraine. Here, PRRT2 is linked to familial hemiplegic migraine.