Nor is there a large set of causal genes, except for three genes (CACNA1A, ATP1A2 and SCN1A) (De Fusco et al. 2003; Dichgans et al. 2005; Ophoff et al. 1996) that have been identified for FHM, that can guide gene identification efforts in the common forms of migraine. The gene discussed is ATP1A2; the disease is migraine disorder.