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Published on: February 27, 2018
Issues related to DNA testing for Huntington's disease in symptomatic patients
1Ohio State University College of Medicine, Columbus, USA.
Seminars in Neurology
|January 1, 1997
Summary
The DNA test for Huntington's disease simplifies diagnosis but raises significant clinical and ethical questions. Further guidelines are needed for genetic counseling and determining when presymptomatic testing is appropriate.
Area of Science:
- Neurogenetics
- Medical Ethics
- Genetic Counseling
Background:
- Huntington's disease is an incurable neurodegenerative disorder.
- DNA testing offers a method for diagnosing Huntington's disease.
- The implications of genetic testing extend beyond clinical diagnosis.
Observation:
- A review of 80 patients undergoing DNA testing for Huntington's disease revealed ongoing clinical and ethical challenges.
- 54 out of 80 patients received a positive test result.
- Seven case examples highlight the complexity of issues arising from testing.
Findings:
- Key unresolved issues include the scope and provider of genetic counseling.
- The indications for presymptomatic testing for this incurable condition remain debated.
- Access to detailed genetic information, such as repeat length influencing age of onset, is a point of discussion.
- Patient privacy regarding test results versus the rights of insurers and relatives is a significant concern.
Implications:
- Clinical practice requires updated guidelines for genetic counseling and testing protocols for Huntington's disease.
- Ethical frameworks must address patient autonomy, informed consent, and data privacy in genetic testing.
- Further research is needed to establish best practices for managing the psychosocial impact of genetic testing for Huntington's disease.
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01:21Huntington Disease l: Introduction
Huntington disease or HD is a progressive, fatal neurodegenerative disorder inherited in an autosomal dominant pattern.PathophysiologyIt is caused by expansion of the CAG trinucleotide repeat in the HTT gene on chromosome 4 (4p16.3), producing an abnormal huntingtin protein with an expanded polyglutamine tract. This misfolded protein disrupts cellular function, leading to neuronal death. Normal alleles have ≤26 repeats, 27–35 are intermediate (risk of expansion), 36–39 show reduced penetrance,...