Alcoholism: recent advances in epidemiology, biochemistry and genetics.

Countries traditionally consuming beer and wine have high alcohol consumption as compared to East Asia, where the fact of low alcoholism prevalence can be attributed to a defect in metabolic degradation of ethanol. Dependence on alcohol is multifactorial and is related to a complex interplay of metabolic, genetic, social and environmental factors. Repetitive alcohol ingestion and its resulting dependence is associated with false euphoria triggered by an inhibition of glutamate receptors and other brain neurotransmitters, namely dopamine and serotonine. Genetic polymorphisms of genes encoding the alcohol metabolism enzymes and neurotransmitter signaling molecules in dopamine, gamma aminobutyric acid, opioid and serotonin systems, are involved in individual variations for susceptibility to alcohol dependence. Prominent progress has been achieved toward identification of genes related to alcoholism. Six genes were described on chromosomes 4, 7, 8, 11, 15 and 20, which are known to have influence on neuronal signal transfer and generation of dopamine receptors. It is suggested that such genes carry the risk for alcoholism. In the last years, the role of (GABA) receptors in the development of alcoholism is studied in detail. In future it may be possible to separate the genetic, enzymatic and environmental factors that are responsible for increased vulnerability of some individuals to alcohol abuse (Fig. 2, Tab. 1, Ref. 19). Full Text (Free, PDF) www.bmj.sk.