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Bipolar disorder and schizophrenia: convergent molecular data
1Department of Psychiatry, Center for Neurobiology and Behavior, University of Pennsylvania, PA, USA. wadeb@mail.med.upenn.edu
Neuromolecular Medicine
|March 6, 2004
Summary
Bipolar disorder (BPD) and schizophrenia (SZ) share genetic factors, suggesting common susceptibility genes. Research identifies five genomic regions potentially linked to both conditions, necessitating a reevaluation of current diagnostic categories.
Area of Science:
- Psychiatry
- Genetics
- Molecular Biology
Background:
- Bipolar disorder (BPD) and schizophrenia (SZ) are distinct psychiatric diagnoses in current nosology.
- However, emerging evidence suggests potential shared genetic underpinnings between BPD and SZ.
- Understanding these shared factors could refine diagnostic classifications.
Purpose of the Study:
- To review evidence for shared genetic susceptibility between bipolar disorder and schizophrenia.
- To identify specific genomic regions implicated in the etiology of both disorders.
- To propose revisions to current nosology based on genetic findings.
Main Methods:
- Systematic review of epidemiologic characteristics.
- Analysis of family studies investigating familial aggregation.
- Examination of confirmed linkage studies for BPD and/or SZ.
Main Results:
- Evidence from epidemiology, family studies, and linkage analyses supports shared genetic factors.
- Five specific genomic regions are highlighted as potential sites of shared genetic susceptibility.
- These findings challenge the strict separation of BPD and SZ in current diagnostic systems.
Conclusions:
- Shared genetic etiologies between bipolar disorder and schizophrenia are supported by multiple lines of evidence.
- Identification of specific susceptibility genes within the five identified genomic regions is crucial.
- Future research should focus on gene discovery to inform necessary changes in psychiatric nosology.