(6) Although SNPs in 3′-UTR regions that are targeted by miR-34b or miR-34c were selected solely on the basis of genetic coverage criteria, prediction of the functional significance of the ADHD risk variants in MET, NOTCH2 and HMGA2 genes supports their impact on miRNA target site recognition but none of them involved miR-34. Here, HMGA2 is linked to attention deficit-hyperactivity disorder.