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Duplication 8q22.1-q24.1 associated with bipolar disorder and speech delay
J F Macayran1, S G Brodie, P N Rao
1Department of Pediatrics, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095-7088, USA.
Bipolar Disorders
|May 16, 2006
Summary
A child diagnosed with bipolar disorder had an unbalanced translocation on chromosome 8. This genetic finding supports previous research linking chromosome 8q to bipolar disorder risk.
Area of Science:
- Genetics
- Psychiatry
- Developmental Biology
Background:
- Bipolar disorder is a complex psychiatric condition with a significant genetic component.
- Genome-wide linkage scans have suggested a potential susceptibility locus for bipolar disorder on chromosome 8q.
Observation:
- A 7-year-old boy presented with symptoms including attention deficits, impulsivity, pressured speech, sleep disturbance, aggression, and hypersexuality, leading to a diagnosis of bipolar disorder.
- The child exhibited borderline intellectual and adaptive functioning and mild dysmorphic features.
- Genetic analysis revealed an unbalanced chromosomal translocation resulting in a duplication of distal 8q, originating from a maternal 15p;8q insertion.
Findings:
- The identified unbalanced translocation involves chromosome 8 long arm (8q).
- This specific chromosomal abnormality, a duplication of distal 8q, is a novel finding in a pediatric case of bipolar disorder.
Implications:
- This case provides empirical support for the hypothesis that genes on chromosome 8q play a role in the etiology of bipolar disorder.
- The findings may encourage further investigation into specific genes within the 8q region for their contribution to bipolar disorder pathogenesis.
- Understanding the genetic underpinnings of bipolar disorder can inform diagnostic and therapeutic strategies.
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