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Mechanisms in the relation between GABRA2 and adolescent externalizing problems.

Frances L Wang1, Laurie Chassin2, Christian Geiser3

  • 1Department of Psychology, Arizona State University, 950 S. McAllister Ave, P.O. Box 871104, Tempe, AZ, 85287-1104, USA. franceswang3@gmail.com.

European Child & Adolescent Psychiatry
|March 26, 2015
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Summary
This summary is machine-generated.

The GABRA2 gene influences adolescent externalizing behaviors like conduct problems and alcohol use, with impulsivity playing a key mediating role. Sensation seeking also contributes to alcohol problems, suggesting multiple genetic pathways to risk.

Keywords:
Alcohol problemsConduct problemsGABRA2Hyperactive–inattentive symptomsImpulsivitySensation seeking

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Area of Science:

  • Neurogenetics
  • Adolescent Psychology
  • Behavioral Genetics

Background:

  • Externalizing problems such as conduct and alcohol problems, along with hyperactive-inattentive symptoms, frequently co-occur in adolescents and have a heritable component.
  • The gamma-aminobutyric acid A receptor, alpha2 gene (GABRA2) has been linked to a wide range of externalizing behaviors and traits related to disinhibition.

Purpose of the Study:

  • To investigate whether impulsivity and sensation seeking mediate the association between GABRA2 and adolescent hyperactive-inattentive symptoms, conduct problems, and alcohol problems.
  • To explore the genetic underpinnings of disinhibition and its role in adolescent behavioral issues.

Main Methods:

  • Longitudinal assessment of 292 adolescents across two waves (ages 11–17 and 12–18).
  • Analysis of the GABRA2 single nucleotide polymorphism (SNP) rs279858, which tags GABRA2 haplotypes.
  • Multi-informant reports on adolescent impulsivity and sensation seeking; adolescent self-reports on hyperactive-inattentive symptoms, conduct problems, and alcohol problems.

Main Results:

  • Impulsivity significantly mediated the relationship between GABRA2 and alcohol problems, hyperactive-inattentive symptoms, and conduct problems.
  • Sensation seeking mediated the effect of GABRA2 on alcohol problems, with AA/AG genotypes indicating risk.
  • GABRA2 directly predicted adolescent alcohol problems, with the GG genotype conferring risk.

Conclusions:

  • Multiple genetic pathways involving GABRA2 may contribute to the development of externalizing problems in adolescence.
  • Impulsivity and sensation seeking are crucial mediators in the genetic influence of GABRA2 on adolescent behavioral outcomes.
  • Findings highlight the complex interplay between genetics and environmental factors in adolescent psychopathology.