TACR1 and attention deficit-hyperactivity disorder: DNA sequencing in cases of BD and ADHD who had inherited TACR1-susceptibility haplotypes identified 19 SNPs in the promoter region, 50 UTR, exons, intron/exon junctions, and 30 UTR of TACR1 that could increase vulnerability to BD, ADS, ADHD, and BP comorbid with ADS.