Affecting 1%–2% of adults aged over 65 years, PD is the second most common neurodegenerative disease.1 Neuropathological hall-marks of PD include the presence of intracellular inclusions containing aggregates of fibrillated α-synuclein, known as Lewy bodies, and the degeneration of dopaminergic neurons in the substantia nigra pars compacta. This evidence concerns the gene SNCA and Parkinson disease.