The discovery that mutations in some genes that code for proteins, such as SNCA, PRKN, PINK1, UCHL1, LRRK2, ATP13A2, GBA, VPS35, DJ-1/PARK7, PLA2G6, SYNJ1, DNAJC6, and FBXO7, associated with a familial form of Parkinson’s disease has been an important input in the basic research of this disease by revealing the association of specified proteins to the disease [49,50,51]. This evidence concerns the gene LRRK2 and Parkinson disease.