VPS35 and Parkinson disease: The PD-linked pathogenic LRRK2 variant R1441G, which lies outside of LRRK2’s kinase domain, and the VPS35 D620N variant have been shown in previous studies and confirmed here to increase LRRK2 activity (Liu et al., 2018; Mir et al., 2018; Purlyte et al., 2018).