Impulsiveness mediates the association between GABRA2 SNPs and lifetime alcohol problems

S. Villafuerte, V. Strumba, S. F. Stoltenberg, R. A. Zucker, M. Burmeister

Research output: Contribution to journalArticlepeer-review

32 Scopus citations


Genetic variants in GABRA2 have previously been shown to be associated with alcohol measures, electroencephalography (EEG) β waves and impulsiveness-related traits. Impulsiveness is a behavioral risk factor for alcohol and other substance abuse. Here, we tested association between 11 variants in GABRA2 with NEO-impulsiveness and problem drinking. Our sample of 295 unrelated adult subjects was from a community of families with at least one male with DSM-IV alcohol use diagnosis, and from a socioeconomically comparable control group. Ten GABRA2 SNPs (single-nucleotide polymorphisms) were associated with the NEO-impulsiveness (P<0.03). The alleles associated with higher impulsiveness correspond to the minor alleles identified in previous alcohol dependence studies. All ten SNPs are in linkage disequilibrium (LD) with each other and represent one effect on impulsiveness. Four SNPs and the corresponding haplotype from intron 3 to intron 4 were also associated with Lifetime Alcohol Problems Score (LAPS, P<0.03) (not corrected for multiple testing). Impulsiveness partially mediates (22.6% average) this relation between GABRA2 and LAPS. Our results suggest that GABRA2 variation in the region between introns 3 and 4 is associated with impulsiveness and this effect partially influences the development of alcohol problems, but a direct effect of GABRA2 on problem drinking remains. A potential functional SNP rs279827, located next to a splice site, is located in the most significant region for both impulsiveness and LAPS. The high degree of LD among nine of these SNPs and the conditional analyses we have performed suggest that all variants represent one signal.

Original languageEnglish (US)
Pages (from-to)525-531
Number of pages7
JournalGenes, Brain and Behavior
Issue number5
StatePublished - Jul 2013
Externally publishedYes


  • Alcohol problems
  • GABRA2
  • Impulsiveness
  • Mediation
  • Single-nucleotide polymorphisms

ASJC Scopus subject areas

  • Genetics
  • Neurology
  • Behavioral Neuroscience


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