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Association studies of bipolar disorder
N Craddock1, S Davé, J Greening
1Division of Neuroscience, University of Birmingham, Birmingham, UK. n.craddock@bham.ac.uk
Bipolar Disorders
|February 15, 2002
Summary
Association studies are crucial for understanding bipolar disorder genetics. While promising, candidate gene approaches face challenges, and no definitive genetic findings have emerged yet.
Area of Science:
- Genetics
- Psychiatry
- Complex Trait Analysis
Background:
- Association studies in outbred populations are vital for investigating complex traits like bipolar disorder.
- This method offers advantages over linkage studies, including robustness to genetic heterogeneity and detection of smaller effect sizes.
Purpose of the Study:
- To critically review the current literature on association studies for bipolar disorder.
- To examine the methodological issues and limitations inherent in genetic dissection of bipolar disorder.
Main Methods:
- Review of existing literature on association studies for bipolar disorder.
- Focus on candidate gene approaches, including variation affecting protein structure or expression (VAPSE).
- Analysis of case-control designs and common polymorphisms in neurotransmitter system genes.
Main Results:
- No definitive genetic findings for bipolar disorder have been established through association studies to date.
- Preliminary findings have implicated polymorphisms in genes such as catechol-o-methyl transferase (COMT), monoamine oxidase A (MAOA), and the serotonin transporter (hSERT; 5-HTT).
Conclusions:
- Association studies are a valuable tool for bipolar disorder research, but methodological challenges remain.
- Future directions may involve refined candidate selection and potentially larger sample sizes for definitive results.