title: Adrenergic alpha2A receptor gene and response to methylphenidate in attention-deficit/hyperactivity disorder-predominantly inattentive type.
abstract: An association between ADRA2A -1291 C > G polymorphism and response to methylphenidate in inattentive symptoms was previously suggested in children with ADHD. No investigation specifically assessed this association in ADHD-inattentive type (ADHD-I). In this naturalistic pharmacogenetic study, 59 subjects with ADHD-I from a non-referred sample were treated with short-acting methylphenidate and genotyped for ADRA2A -1291 C > G polymorphism. The primary outcome measure was the inattentive subscale of the SNAP-IV applied by a child psychiatrist blinded to genotype at baseline and first month of treatment. Children and adolescents with the G allele showed significantly lower inattentive scores with MPH treatment at the first month of treatment than subjects without the G allele (n = 59; F = 6.14; p = 0.016). We extended to ADHD-I previous findings suggesting the influence of the G allele at the ADRA2A -1291 C > G polymorphism on the improvement of inattentive symptoms with methylphenidate in children with all ADHD subtypes.
authors.affiliation: ADHD Outpatient Clinic, Child and Adolescent Psychiatric Division, Hospital de Clínicas de Porto Alegre, Federal University of Rio Grande do Sul, Rio Grande do Sul, Brazil.
authors.forename: T L
authors.initials: TL
authors.lastname: da Silva
authors.forename: T G
authors.initials: TG
authors.lastname: Pianca
authors.forename: T
authors.initials: T
authors.lastname: Roman
authors.forename: M H
authors.initials: MH
authors.lastname: Hutz
authors.forename: S V
authors.initials: SV
authors.lastname: Faraone
authors.forename: M
authors.initials: M
authors.lastname: Schmitz
authors.forename: L A
authors.initials: LA
authors.lastname: Rohde
mesh_terms: D000293:Adolescent; D000483:Alleles; D000704:Analysis of Variance; D001289:Attention Deficit Disorder with Hyperactivity / Q000145:classification / Q000188:drug therapy* / Q000235:genetics*; D000697:Central Nervous System Stimulants / Q000627:therapeutic use*; D002648:Child; D005260:Female; D005787:Gene Frequency; D006801:Humans; D008297:Male; D008774:Methylphenidate / Q000627:therapeutic use*; D010597:Pharmacogenetics; D020641:Polymorphism, Single Nucleotide / Q000235:genetics; D018341:Receptors, Adrenergic, alpha-2 / Q000235:genetics*
chemical_list: D000697:Central Nervous System Stimulants; D018341:Receptors, Adrenergic, alpha-2; D008774:Methylphenidate