Thereafter, several reports of patients with NPDs carrying CNVs in PRKN were published,13, 14, 15 and case–control association studies attempted to clarify the role of heterozygous CNVs in PRKN in NPDs, including attention‐deficit/hyperactivity disorder (ADHD)16, 17 and ASD.18, 19. Here, PRKN is linked to attention deficit-hyperactivity disorder.