NALCN and Familial paroxysmal ataxia: In contrast to the aforementioned types of episodic ataxia the following genes are associated with episodic ataxia, but not OMIM listed as distinct groups: ATP1A3 (55), PRRT2 (56), SLC2A1 (57), TBC1D24 (58), KCNA2 (59), CEP290 (60), FGF14 (61), and NALCN (62).