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The monoamine oxidase B gene exhibits significant association to ADHDLi, Jun; Wang, Yufeng; Hu, Songnian; Zhou, Rulun; Yu, Xiaomin; Wang, Bing; Guan, Lili; Yang, Li; Zhang, Feng; Faraone, Stephen V. (Wiley, 2008)Attention deficit hyperactivity disorder (ADHD) is a common neuropsychiatric condition with strong genetic basis. Recent work in China indicated that ADHD may be linked to Xp1–2 in the Han Chinese population. The gene encoding monoamine oxidase B (MAOB), the main enzyme degrading dopamine in the human brain, is located in this region. The current study sequenced the exons and the 50 and 30 flanking regions of theMAOBgene and found four common variants including 2276C>T and 2327C>T in exon 15, rs1799836 in intron 13 and rs1040399 in 30-UTR. We assessed the association of these variants with ADHD in 548 trios collected from 468 males and 80 females probands. TDT analysis showed that alleles of each polymorphism were preferentially transmitted to probands (rs1799836, P¼3.28E-15; rs1040399, P¼1.87E-6; 2276T>C or 2327T>C, P¼2.20E-6) and haplotype-based TDT analyses also found distorted transmission. In conclusion, this study provides the strongest evidence for the involvement of MAOB gene in the etiology of ADHD to date, at least in Han Chinese population.