Data on the specific contribution of VPS35 variants in F-PD and S-PD can be obtained from case-control studies which consider F-PD or S-PD as distinct populations (Ando et al., 2012; Deng et al., 2012; Guella et al., 2012; Guo et al., 2012; Kumar et al., 2012; Lesage et al., 2012; Sheerin et al., 2012; Zhang et al., 2012; Chen et al., 2013; Sudhaman et al., 2013; Blanckenberg et al., 2014; Gagliardi et al., 2014). Here, VPS35 is linked to Parkinson disease.