LRRK2 and Parkinson disease: The c.6055G>A transition in the leucine-rich repeat kinase 2 (LRRK2) gene results in the G2019S substitution in the LRRK2 protein, which is associated with familial, autosomal dominant forms of Parkinson’s Disease (PD) and represents a risk factor for idiopathic PD [1,2].