GBA1 and Parkinson disease: A meta-analysis published in 2009 showed that those carrying the mild N370S variant (recently referred to as c.1226A > G; p.N409S, yet, since the older nomenclature is more widely used, the new one will not be implemented herein) had a three-fold risk of developing PD, while carriers of other GBA1 variants had a significantly higher (10–15-fold) risk compared to the non-carrier population [6,7].