The prevalence of any GBA1 variant was higher than that seen in other studies, probably due to the fact that we included non-coding variants such as c.762 18T>A, which has been reported as a potential risk factor for PD, though its importance is not clear.28 The most common variants were c.762 18T>A, E326K and T369M, which accounted for almost two-thirds of all variants. Here, GBA1 is linked to Parkinson disease.