title: The serotonin 5-HT1B receptor gene and attention deficit hyperactivity disorder.
abstract: Recent research has suggested that serotonin, in addition to dopamine, may be involved in the development of attention deficit hyperactivity disorder (ADHD). Serotonin regulates dopaminergic neurotransmission in some areas of the brain via several 5-HT receptors including 5-HT1B. Animal studies have suggested the involvement of the 5-HT1B receptors in locomotor behaviour. For these reasons, we hypothesized that the 5-HT1B receptor gene may be a good candidate for genetic studies of ADHD. We tested for linkage disequilibrium between the 5-HT1B G861C polymorphism and ADHD in 115 families using the transmission disequilibrium test (TDT). We found evidence for a trend towards excess transmission of the 861G allele (chi(2) = 2.91, P = 0.09) that when further analysed for parental allele transmissions exhibited significantly greater paternal transmission of the G allele (chi(2) = 4.80, P = 0.03) to the affected child. Although preliminary, results from this study provide additional evidence that serotonin genes may be important risk factors for the development of ADHD.
authors.affiliation: Neurogentics Section, Centre for Addiction and Mental Health, Clarke Division, and Department of Psychiatry, University of Toronto, Canada.
authors.forename: J F
authors.initials: JF
authors.lastname: Quist
authors.forename: C L
authors.initials: CL
authors.lastname: Barr
authors.forename: R
authors.initials: R
authors.lastname: Schachar
authors.forename: W
authors.initials: W
authors.lastname: Roberts
authors.forename: M
authors.initials: M
authors.lastname: Malone
authors.forename: R
authors.initials: R
authors.lastname: Tannock
authors.forename: V S
authors.initials: VS
authors.lastname: Basile
authors.forename: J
authors.initials: J
authors.lastname: Beitchman
authors.forename: J L
authors.initials: JL
authors.lastname: Kennedy
mesh_terms: D000293:Adolescent; D001289:Attention Deficit Disorder with Hyperactivity / Q000453:epidemiology / Q000235:genetics*; D002648:Child; D020022:Genetic Predisposition to Disease / Q000453:epidemiology; D006801:Humans; D015810:Linkage Disequilibrium; D009043:Motor Activity; D044302:Receptor, Serotonin, 5-HT1B; D011985:Receptors, Serotonin / Q000235:genetics*; D012307:Risk Factors
chemical_list: C470302:HTR1B protein, human; D044302:Receptor, Serotonin, 5-HT1B; D011985:Receptors, Serotonin