In addition to BFIS, <i>PRRT2</i> mutations are also associated with paroxysmal kinesigenic dyskinesia (PKD) and infantile convulsions and paroxysmal choreoathetosis (ICCA), indicating a complex genotype-phenotype heterogeneity in <i>PRRT2</i> mutations. This evidence concerns the gene PRRT2 and episodic kinesigenic dyskinesia 1.