Other causative mutations in several other genes, for example, PARK2 (E3 ubiquitin protein ligase), PINK1 (PTEN-induced kinase 1), PARK7 (DJ1, deglycase), LRRK2 (leucine-rich repeat kinase), VPS35 (Vacuolar protein sorting ortholog 35, CHCHD2 (Coiled-Coil-Helix-Coiled-Coil-Helix Domain Containing 2) have been linked to familial forms of PD [16]. Here, PINK1 is linked to Parkinson disease.