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Risk reversals in predictive testing for Huntington disease
1Department of Medical Genetics, University of British Columbia, Vancouver, Canada.
American Journal of Human Genetics
|October 23, 1997
Summary
Predictive testing for Huntington disease (HD) using DNA markers had accuracy limits. Direct HD mutation tests revealed significant risk discrepancies in individuals previously tested, highlighting the need for improved genetic testing strategies.
Area of Science:
- Genetics
- Molecular Biology
- Neurology
Background:
- Early predictive testing for Huntington disease (HD) relied on DNA markers linked to the mutation.
- Accuracy was limited by factors such as genetic recombination, family pedigree complexity, and sample availability.
Observation:
- Direct genetic testing for the HD mutation was compared against previous linkage-based results for six individuals.
- Significant disparities were observed between the two testing methodologies.
Findings:
- Three individuals showed a shift from decreased to increased risk of inheriting the HD mutation.
- Conversely, three individuals experienced a decrease in their calculated risk.
Implications:
- Understanding the causes of these risk reversals is crucial for managing patient expectations and psychological impact.
- This knowledge aids in developing strategies to prevent and manage risk assessment changes in predictive genetic testing programs.