Mutations in the leucine-rich repeat kinase 2 (LRRK2) gene have been linked to inherited Parkinson's disease (Paisan-Ruiz et al., 2004; Zimprich et al., 2004; Gilks et al., 2005; Khan et al., 2005; Nalls et al., 2014). This evidence concerns the gene LRRK2 and Parkinson disease.