GCH1 and Dystonia: The majority (n=43) were carriers of heterozygous variants in genes linked to dominantly inherited dystonia genes (ATP1A3, GCH1, SGCE, KMT2B, THAP1, TOR1A, and VPS16), while only one carrier of a homozygous PLA2G6 variant and one of compound-heterozygous PTS variants (Supplementary Figure 3) were identified.