Marginal downregulation of GRM7 expression was also observed in the ADHD probands having rs3792452 ‘CC’ (P < 0.0001) and rs3749380 ‘CC’ and ‘CT’ (P = 0.03 and P = 0.01) genotypes (Fig. 5E,F). The gene discussed is GRM7; the disease is attention deficit-hyperactivity disorder.