The 6q14 locus, which was repeatedly shown to contain alleles increasing susceptibility to ADHD [27], schizophrenia [28], and bipolar disorder [29], was also shown to contain loss of function allele of KCNQ3 in affected family members with Benign Familial Neonatal Convulsions [30]. This evidence concerns the gene KCNQ3 and attention deficit-hyperactivity disorder.