Genetics of Alcoholism

Purpose of ReviewWe review the search for genetic variants that affect the risk for alcohol dependence and alcohol consumption.Recent FindingsVariations in genes affecting alcohol metabolism (ADH1B, ALDH2) are protective against both alcohol dependence and excessive consumption, but different variants are found in different populations. There are different patterns of risk variants for alcohol dependence vs. consumption. Variants for alcohol dependence, but not consumption, are associated with risk for other psychiatric illnesses.SummaryADH1B and ALDH2 strongly affect both consumption and dependence. Variations in many other genes affect both consumption and dependenceor one or the other of these traitsbut individual effect sizes are small. Evidence for other specific genes that affect dependence is not yet strong. Most current knowledge derives from studies of European-ancestry populations, and large studies of carefully phenotyped subjects from different populations are needed to understand the genetic contributions to alcohol consumption and alcohol use disorders.