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Related Experiment Videos

Proceed with care: direct predictive testing for Huntington disease

C M Benjamin1, S Adam, S Wiggins

  • 1Department of Medical Genetics, University of British Columbia, Vancouver, Canada.

American Journal of Human Genetics
|October 1, 1994
PubMed
Summary

Direct genetic testing for Huntington disease (HD) offers high accuracy for predicting the condition. This advancement requires careful genetic counseling to address unique challenges in predictive testing for this adult-onset neurodegenerative disorder.

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Area of Science:

  • Genetics
  • Neurology
  • Medical Diagnostics

Background:

  • Huntington disease (HD) is an adult-onset neurodegenerative disorder.
  • Predictive testing for HD has evolved with gene cloning and direct CAG repeat analysis.
  • Previous testing methods relied on linked markers, posing limitations.

Purpose of the Study:

  • To describe protocols for direct predictive testing for Huntington disease (HD).
  • To outline approaches for adult and prenatal HD genetic testing.
  • To address the unique genetic counseling issues associated with direct HD testing.

Main Methods:

  • Direct analysis of CAG repeat expansion in the Huntington disease (HD) gene.
  • Utilizing experience from the Canadian Collaborative Study on Predictive Testing (CCSPT).

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  • Developing community-based approaches to improve access to predictive testing.

    • Main Results:

    • Over 416 direct CAG repeat analyses for HD predictive testing were performed.
    • 86% of direct predictive tests were requested by individuals not previously tested with linked markers.
    • Recommendations include assessing DNA from an affected relative to enhance predictive accuracy.

    Conclusions:

    • Direct CAG repeat analysis provides highly accurate predictive testing for Huntington disease (HD).
    • Specialized genetic counseling is essential to manage the implications of direct predictive testing.
    • Community-based strategies improve access to HD genetic testing, overcoming geographical barriers.