Genetic and environmental contributions to age of onset of alcohol dependence symptoms in male twins.
- Authors
- Liu, I-Chao; Blacker, Deborah L; Xu, Ronghui; Fitzmaurice, Garrett; Tsuang, Ming T; Lyons, Michael J
- Year
- 2004
- Journal
- Addiction (Abingdon, England)
- PMID
- 15500593
- DOI
- 10.1111/j.1360-0443.2004.00877.x
AIMS: To investigate genetic and environmental influences on the development of specific alcohol dependence symptoms. DESIGN AND PARTICIPANTS: A classical twin study of 3372 male-male twin pairs in the Vietnam Era Twin (VET) Registry based on telephone interviews about alcohol use. MEASUREMENTS: The nine diagnostic symptoms according to the Diagnostic and Statistical Manual of Mental Disorder, version III (revised) (DSM-III-R) definition of alcohol dependence. Symptoms were grouped into those based on impaired control, biological effects and social consequences (Beresford's classification) or early versus late symptoms (Nelson's classification). Survival models with random effects were used to examine the age of onset of each symptom. FINDINGS: Approximately 38% of the variation in age of onset of each symptom group based on Beresford's classification is due to additive genetic factors. The age of onset of late symptoms from Nelson's classification appears to be most affected by genetic factors. Estimates of genetic effects for impaired control symptoms are greatly decreased when twins with comorbid psychiatric disorders are excluded. CONCLUSIONS: Our results support the heritability of age of onset of DSM-III-R-defined symptoms for alcohol dependence. However, no symptom group in Beresford's classification could be identified as more heritable than other symptom groups. A strong association between genetic vulnerability and co-occurring diseases for symptoms indicative of impaired control could be found. In addition, our findings show that the late symptom group could be a good candidate for subsequent genetic research.
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