DRD2 and attention deficit-hyperactivity disorder: With this additional data, we show that common genetic variants harbored in the LPHN3, NCAM1, TTC12, ANKK1, DRD2, and CDH13 genes, known to predispose to ADHD and to disruptive behavior symptoms present in ODD, CD, and SUD, are overrepresented in a network of genes ontologically linked to neurodevelopment.