KCNN2 and Parkinsonism: Furthermore, we identified rare variants in parkinsonism and dystonia genes, including novel VPS13D homozygous variants in four cases, and heterozygous variants in PD8EB, KCNN2, CSF1R, THAP1, TOR1A, ANO3, GCH1, VPS16, KCDT17, KMT2B, and ATP1A3 genes.