Here, by analysing rare coding variants in exome-sequencing data from 8,895 individuals with ADHD and 53,780 control individuals, we identify three genes (MAP1A, ANO8 and ANK2; P < 3.07 × 10−6; odds ratios 5.55–15.13) that are implicated in ADHD. The gene discussed is MAP1A; the disease is attention deficit-hyperactivity disorder.