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A NOS-III haplotype that includes functional polymorphisms is associated with bipolar disorder
Andreas Reif1, Alexander Strobel, Christian P Jacob
1Clinical and Molecular Psychobiology, Department of Psychiatry and Psychotherapy, University of Würzburg, Würzburg, Germany. a.reif@gmx.net
The International Journal of Neuropsychopharmacology
|June 22, 2005
Summary
The nitric oxide synthase-III (NOS-III) gene may be linked to bipolar disorder risk. This study found a NOS-III gene haplotype associated with bipolar disorder, suggesting a potential genetic contribution to the condition.
Area of Science:
- Neuroscience
- Genetics
- Psychiatry
Background:
- Nitric oxide (NO) is a messenger molecule involved in central nervous system (CNS) functions like learning and memory.
- Neuronal NO synthase (NOS-I) and endothelial NO synthase (NOS-III) generate NO in the human brain.
- Previous research linked NOS-III to neurogenesis and learned helplessness.
Purpose of the Study:
- To investigate the potential role of NOS-III in affective disorders.
- To examine the association between a NOS-III gene haplotype and bipolar disorder and major depression.
Main Methods:
- A specific NOS-III gene haplotype, comprising three functional polymorphisms, was analyzed.
- The study compared the frequency of this haplotype in patients with bipolar disorder and major depression against healthy controls.
Main Results:
- A significant global association was found between the NOS-III haplotype and bipolar disorder (p(global) = 0.021).
- The association was specific to bipolar disorder, with no significant link found for unipolar depression.
- A strong association was observed for the specific t-a-g haplotype (p(t-a-g) < 0.001).
Conclusions:
- The NOS-III genotype may represent a modest genetic risk factor for developing bipolar disorder.
- Further research using within-family designs and diverse ethnic samples is recommended to validate these findings.