GBA1 patients showed more severe symptoms and a higher burden of motor and non-motor complications compared to negative patients (dyskinesias OR 3, sleep disturbances OR 2.8, cognitive deficits OR 3.6; p < 0.05), with greater autonomic dysfunction (COMPASS-31 score 34.1 vs 20.2, p 0.03). Here, GBA1 is linked to drug-induced dyskinesia.