To avoid confusion with the nonlysosomal genes GBA2 and GBA3, the GBA gene is also referred to as GBA1. In most populations, 4%‐12% of PD patients carry a heterozygous GBA1 variant and in Ashkenazi Jewish PD patients this is approximately 20%.2, 3 The risk of PD in GBA1 variant carriers is increased by an estimated overall 2‐ to 7‐fold (odds ratios [ORs]).2, 3, 4, 5 Rare homozygous or compound heterozygous GBA1 variants can cause the autosomal‐recessive lysosomal storage disorder Gaucher's disease (GD). This evidence concerns the gene GBA1 and Parkinson disease.