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A locus for bipolar affective disorder on chromosome 4p
D H Blackwood1, L He, S W Morris
1Edinburgh University, Department of Psychiatry, Royal Edinburgh Hospital, UK.
Nature Genetics
|April 1, 1996
Summary
Genetic factors contribute to bipolar disorder. This study identified a potential linkage on chromosome 4p in twelve bipolar families, suggesting a specific genetic region associated with the illness.
Area of Science:
- Psychiatry
- Genetics
- Molecular Biology
Background:
- Bipolar affective disorder and unipolar disorder (major depressive disorder) are common, severe mood disorders with significant genetic components.
- Previous genetic linkage studies for bipolar disorder have yielded inconsistent results across various chromosomes.
- Understanding the genetic underpinnings is crucial for diagnosing and treating these prevalent conditions.
Purpose of the Study:
- To investigate the genetic basis of bipolar disorder through linkage analysis in affected families.
- To identify specific chromosomal regions associated with bipolar disorder susceptibility.
Main Methods:
- A genome-wide search was conducted in twelve bipolar families using 193 genetic markers.
- Linkage analysis, including two-point and three-point analyses, was performed.
- Statistical methods were used to assess linkage and heterogeneity.
Main Results:
- A significant linkage signal was detected on chromosome 4p in one family, with marker D4S394 yielding a lod score of 4.1.
- Further analysis in eleven additional families combined with the first family provided evidence of linkage with heterogeneity (maximum lod score of 4.1).
Conclusions:
- The findings suggest a potential susceptibility locus for bipolar disorder on chromosome 4p.
- Further research is warranted to confirm and refine the location of this gene(s) and elucidate its role in bipolar disorder.