SNCA and Parkinson disease: We tested the panel's diagnostic utility on patients with 1) known pathogenic variants in LRRK2, PRKN, SNCA, and RAB32 (n = 6); 2) idiopathic PD negative for known genetic causes (n = 3); 3) known repeat expansions in the genes ATXN1, ATXN2, ATXN3, C9orf72, DAB1, FGF14, HTT, RFC1, TAF1, and ZFHX3 (n = 12).