The identified genes were GNAO1, SCN8A, CACNA1A, SCN1A, WWOX, CDKL5, SCN2A, KCNQ2, STXBP1, and KCNA2. The spectrum of movement disorders include involuntary movements, dystonia, ataxia, chorea, myoclonus, tremors, spasms, and central motor disorders. This evidence concerns the gene KCNA2 and cerebellar ataxia.