A Polymorphism in GABRA2 Is Associated With the Medial Frontal Response to Alcohol Cues in an fMRI Study

• Published in: Alcoholism, clinical and experimental research Vol. 34; no. 12; pp. 2169 - 2178
• Main Authors: Kareken, David A., Liang, Tiebing, Wetherill, Leah, Dzemidzic, Mario, Bragulat, Veronique, Cox, Cari, Talavage, Thomas, O'Connor, Sean J., Foroud, Tatiana
• Format: Journal Article
• Language: English
• Published: Oxford, UK Blackwell Publishing Ltd 01.12.2010; Wiley
• Subjects: Addiction; Adult; Alcoholic Intoxication - genetics; Alcoholic Intoxication - physiopathology; Alcoholism - genetics; Alcoholism - physiopathology; Alcoholism and acute alcohol poisoning; Alleles; Behavior, Addictive - genetics; Behavior, Addictive - physiopathology; Biological and medical sciences; Brain Mapping - methods; Cues; Drug addictions; Ethanol - pharmacology; Female; Genetics; Genotype; Humans; Magnetic Resonance Imaging; Male; Medical sciences; Neuroimaging; Odorants; Olfaction; Polymorphism, Single Nucleotide; Prefrontal Cortex - drug effects; Prefrontal Cortex - physiology; Receptors, GABA-A - genetics; Reward; Risk; Toxicology; Neuroimaging; Genetic variability; Ethanol; Central nervous system; Genotype; Risk; Nuclear magnetic resonance imaging; Encephalon; Alcoholic beverage; Addiction; Risk factor; Olfaction; Frontal; Genetics; Medical imagery; Drug of abuse; Reward; Functional imaging; Polymorphism
• ISSN: 0145-6008; 1530-0277; 1530-0277
• DOI: 10.1111/j.1530-0277.2010.01293.x

Background:  Significant evidence has accumulated to suggest an association between single‐nucleotide polymorphisms (SNPs) in the GABRA2 gene and alcoholism. However, research has yet to show an association between these polymorphisms and the human brain’s reward system function. In this study, we stratified subjects who had participated in an fMRI study of alcohol cue responses according to their genotype at a SNP in GABRA2 (rs279871) shown to be associated with alcohol dependence (Edenberg et al., 2004). Methods:  Genotyping showed 13 subjects to be homozygous for the high‐risk allele (AA), and 23 subjects to be heterozygous (AG). In fMRI, subjects were exposed to the aromas of their preferred alcoholic drink odors (AO), as well as to appetitive control odors (ApCO) under both alcohol intoxication and placebo control conditions. Results:  Homozygous AA subjects had a larger [AO > ApCO] response than did AG subjects in medial frontal cortical areas thought to code reward value. However, AG subjects had a larger [AO > ApCO] effect in the ventral tegmental area. Alcohol intoxication did not alter these group differences. Conclusions:  These are the first data to suggest that GABRA2 genotype could affect the brain’s responses to cues associated with alcohol.