GBA1 and Gaucher disease: A UK-based study (the Tracking Parkinson’s study) evaluated 1893 recently diagnosed PD patients (≤3.5 years) and identified known Gaucher disease-causing GBA1 pathogenic variants in 2.5% of the patients (n = 48), nonsynonymous variants previously associated with PD in 6.2% of the patients (n = 117), and variants of unknown significance in 1.5% of the patients (n = 28).