Although CNVs have been shown to play a role in PD pathogenicity,8 they are generally rare and observed in a small proportion of affected individuals at any given gene locus.9 Notable CNVs in the context of PD commonly include exonic deletions and duplications in PRKN and PINK1 as well as whole gene duplications and triplications of SNCA. The gene discussed is SNCA; the disease is Parkinson disease.