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What can psychiatric genetics offer suicidology?
P McGuffin1, A Marusic, A Farmer
1MRC SGDP Research Center, Institute of Psychiatry, London, UK. p.mcguffin@iop.kcl.ac.uk
Crisis
|December 1, 2001
Summary
Genetic factors significantly contribute to familial depression and suicidal behavior. Studies indicate a heritability of approximately 43% for completed suicide, suggesting complex genetic influences.
Area of Science:
- Psychiatry
- Behavioral Genetics
- Epidemiology
Background:
- Depression and suicidal behavior exhibit familial clustering.
- First-degree relatives of suicide victims have an elevated risk.
- Identical twins of suicide victims show a significantly higher relative risk.
Purpose of the Study:
- To investigate the genetic heritability of completed suicide.
- To explore the relationship between genes predisposing to suicide and affective disorder.
- To understand the complex genetic inheritance patterns of suicidal behavior.
Main Methods:
- Application of a structural equation model to published data on suicide.
- Review of familial aggregation studies and twin studies.
- Analysis of preliminary candidate gene association studies, including serotonergic pathways.
Main Results:
- Heritability estimates for completed suicide suggest a genetic contribution of approximately 43%.
- Suicidal behavior appears to involve complex inheritance with multiple genes.
- The overlap between genes for suicide and depression is likely incomplete.
Conclusions:
- Genetic factors play a substantial role in suicidal behavior.
- Future research should focus on complex genetic models and large-scale association studies.
- Identifying specific genes requires advanced methods like linkage disequilibrium studies.