Parkinson disease (PD) is due to the progressive degeneration of dopaminergic neurons in the midbrain, and the affected neurons contain inclusions called Lewy bodies (LBs) and Lewy neurites (LNs) that are filled with aggregates and amyloid fibers of the presynaptic protein alpha-synuclein (α-syn) [1]. The gene discussed is SNCA; the disease is Parkinson disease.