Observations have shown that the development of hereditary Parkinson’s disease may be due to a mutation in the genes of one of the five proteins responsible for the functioning of mitochondria—α-synuclein, parkin, DJ-1, PTEN-induced kinase 1 (PINK1), and leucine-rich repeat kinase 2 (LRRK2). This evidence concerns the gene PINK1 and Parkinson disease.