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The genetics of alcohol dependence
Danielle M Dick1, Laura J Bierut
1Department of Psychiatry, Box 8134, 660 South Euclid Avenue, St. Louis, MO 63130, USA.
Current Psychiatry Reports
|March 17, 2006
Summary
Genetic factors significantly contribute to alcohol dependence, with heritability estimates between 50-60%. Research is identifying specific genes related to alcohol metabolism and neurotransmitter systems, advancing our understanding of genetic predisposition.
Area of Science:
- Neuroscience
- Genetics
- Psychiatry
Background:
- Alcohol dependence is a prevalent and complex disorder with substantial societal and interpersonal costs.
- Genetic factors play a significant role in alcohol dependence, with heritability estimates ranging from 50% to 60%.
Purpose of the Study:
- To review associated susceptibility genes involved in the predisposition toward alcohol dependence.
- To highlight recent progress in identifying specific genes contributing to alcohol dependence.
Main Methods:
- Review of existing family, twin, and adoption studies demonstrating genetic heritability.
- Identification and categorization of genes associated with alcohol metabolism and neurotransmitter systems (GABAergic, opioid, dopaminergic, cholinergic, serotonergic).
Main Results:
- Genes involved in alcohol metabolism are linked to alcohol dependence risk.
- Genes modulating neurotransmitter systems, including GABAergic, opioid, dopaminergic, cholinergic, and serotonergic pathways, are associated with susceptibility.
- Significant genetic heritability (50-60%) underscores the role of inherited factors.
Conclusions:
- Continued research into specific susceptibility genes is crucial for understanding alcohol dependence.
- Future research should focus on characterizing gene-environment interactions and their impact on comorbid disorders and developmental risk trajectories.