Several (Fig. S11) relate to ion channels (e.g., KCNIP1, KCNK10, CACNA1E, and CACNB4) or are involved in cell adhesion (e.g., NCAM2, NRXN1, CNTNAP2, and CDH22), both previously implicated in ADHD or other psychiatric traits54–58. Here, CDH22 is linked to attention deficit-hyperactivity disorder.