The loss of dopaminergic neurones and the accumulation of Lewy bodies (LB), cytoplasmic inclusions consisting of α -synuclein in the brain, leads to PD, the fastest growing neurological disorder in the world (Volpicelli-Daley et al., 2014; Poewe et al., 2017; Raza et al., 2019). The gene discussed is SNCA; the disease is Parkinson disease.