According to a new study directed by psychology graduate student Helle Larsen of Radboud University Nijmegen in the Netherlands, the relationship between drinking alcohol and drinking in groups may be genetically linked. In other words, those who inherit a specific gene which affects the brain’s “reward system” are more likely to drink greater amounts of alcohol in the company of their party-loving peers.
As reported in an online article in Psychological Science, the study suggests that “Adults carrying at least one copy of a long version of the dopamine D4 receptor gene, dubbed DRD4, imbibed substantially more alcohol around a heavy-drinking peer than did others who lacked that gene variant.”
Larsen’s study is the first to offer evidence that a gene influences human alcohol use in social situations. “Carriers of the long gene may be more attuned to, and influenced by, another person’s heavy drinking than noncarriers are,” Larsen says.
An article in Science News, which sheds light on how the study was conducted, reported that: “Scientists have yet to decipher the precise brain effects of DRD4’s long form. Larsen hypothesizes that in the presence of heavy drinkers, the gene variant may increase dopamine activity in brain areas that amplify alcohol’s appeal as a rewarding social activity.”
Other attempts to substantiate findings of gene-environment interaction have yielded mixed resulsts, so Larsen agrees that other researchers will need to confirm these findings.
