Variants in genes such as SNCA (synuclein alpha, encoding α-Syn), GBA (glucosylceramidase beta, encoding GBA protein), LRRK2 (leucine-rich repeat kinase 2, encoding LRRK2 protein), and MAPT (microtubule associated protein, encoding Tau) have been found to increase the risk of PD (Bras and Singleton 2009). Here, LRRK2 is linked to Parkinson disease.