Genetic association of a GABA(A) receptor γ2 subunit variant with severity of acute physiological dependence on alcohol

Kari Buck, Heather M. Hood

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

The ultimate goal of quantitative trait locus (QTL) mapping is to identify the genes affecting complex traits. Using animal models, we recently identified QTLs on mouse Chromosomes (Chrs) 1, 4, and 11 affecting genetic predisposition to acute alcohol withdrawal. Among mice derived from the C57BL/6J (B6) and DBA/2J (D2) inbred strains, the locus identified on Chr 11 (~20 cM) accounted for 12% of the genetic variability in withdrawal liability. Candidate genes in proximity to this QTL encode the γ2, α1, and α6 subunits of GABA(A) receptors. The present studies identify a polymorphism between the B6 and D2 strains in the γ2 subunit gene, Gabrg2, and expand genotypic analysis to their BXD recombinant inbred strains. This polymorphism predicts a difference in amino acid sequence (Ala-11 vs. Thr- 11) within the extracellular amino-terminal region of the γ2 subunit. Analysis using BXD strain means for acute alcohol withdrawal severity suggests that the γ2 subunit polymorphism is genetically correlated with alcohol withdrawal severity. This is the first report that QTL mapping for an alcohol-related trait has successfully led to the identification of a polymorphic candidate gene product that is genetically associated with the trait.

Original languageEnglish (US)
Pages (from-to)975-978
Number of pages4
JournalMammalian Genome
Volume9
Issue number12
DOIs
StatePublished - 1998

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GABA-A Receptors
Alcoholism
Quantitative Trait Loci
Alcohols
Genes
Chromosomes, Human, Pair 11
Chromosomes, Human, Pair 4
Chromosomes, Human, Pair 1
Genetic Predisposition to Disease
Inbred C57BL Mouse
Amino Acid Sequence
Animal Models

ASJC Scopus subject areas

  • Genetics

Cite this

Genetic association of a GABA(A) receptor γ2 subunit variant with severity of acute physiological dependence on alcohol. / Buck, Kari; Hood, Heather M.

In: Mammalian Genome, Vol. 9, No. 12, 1998, p. 975-978.

Research output: Contribution to journalArticle

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