title: Association between tryptophan hydroxylase gene polymorphisms and attention deficit hyperactivity disorder in Chinese Han population.
abstract: Attention deficit hyperactivity disorder (ADHD) is a severe behavioral disorder in children known to have a substantial genetic component. Prior studies have implicated serotonin genes in the etiology of ADHD but have not examined tryptophan hydroxylase (TPH), which is a rate-limiting enzyme in serotonin biosynthesis. The current study examined the relationship between the A218C and A-6526G polymorphisms of the TPH gene and ADHD. Three hundred sixty-two unrelated ADHD probands and their biological parents were recruited to participate in this study. No biased transmission of any allele of the two polymorphisms was observed using TDT analysis. However, haplotype analyses found that the rare 218A/-6526G haplotype was significantly not transmitted to probands with ADHD (chi(2) = 4.4995, P = 0.034), regardless of subtype. Although this finding for ADHD in the Chinese Han population.
authors.affiliation: Institute of Mental Health, Peking University (Peking University Sixth Hospital) Beijing, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Li
authors.forename: Yufeng
authors.initials: Y
authors.lastname: Wang
authors.forename: Rulun
authors.initials: R
authors.lastname: Zhou
authors.forename: Haobo
authors.initials: H
authors.lastname: Zhang
authors.forename: Li
authors.initials: L
authors.lastname: Yang
authors.forename: Bing
authors.initials: B
authors.lastname: Wang
authors.forename: Stephen V
authors.initials: SV
authors.lastname: Faraone
mesh_terms: D000293:Adolescent; D000483:Alleles; D001289:Attention Deficit Disorder with Hyperactivity / Q000175:diagnosis / Q000201:enzymology / Q000235:genetics*; D002648:Child; D002681:China; D005260:Female; D005787:Gene Frequency; D005838:Genotype; D006239:Haplotypes; D006801:Humans; D015810:Linkage Disequilibrium; D008297:Male; D020641:Polymorphism, Single Nucleotide; D014365:Tryptophan Hydroxylase / Q000235:genetics*
chemical_list: D014365:Tryptophan Hydroxylase