Activating mutations in the leucine-rich repeat kinase 2 (LRRK2) cause inherited Parkinson’s disease and lead to the phosphorylation of a subset of Rab GTPases (Alessi and Sammler, 2018; Pfeffer, 2022), in particular, Rab8A, Rab10, and Rab29 within a conserved residue of the Switch II effector-binding motif. This evidence concerns the gene RAB6A and Parkinson disease.