To date, as many as 20 genes have been linked with PD, eight genes out of which are thought to be concerned with an inheritance mode of autosomal-recessive type, out of which Parkin, DJ-1, and tensin homolog-induced putative kinase 1 (PINK1) are associated with the typical early-onset PD [27]. The gene discussed is PINK1; the disease is Parkinson disease.