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Motor changes in presymptomatic Huntington disease gene carriers
E Siemers1, T Foroud, D J Bill
1Department of Neurology, Indiana University School of Medicine, Indianapolis, USA.
Archives of Neurology
|June 1, 1996
Summary
Presymptomatic individuals with the Huntington disease (HD) allele show subtle changes in motor function and reaction time. These early motor deficits may indicate subclinical progression before overt symptoms appear.
Area of Science:
- Neuroscience
- Genetics
- Movement Disorders
Background:
- Huntington disease (HD) is an inherited neurodegenerative disorder.
- Early detection of subclinical changes is crucial for understanding disease progression.
Purpose of the Study:
- To investigate motor function and reaction time in presymptomatic individuals carrying the HD allele.
- To identify early biomarkers of HD.
Main Methods:
- A case-control, double-blind study involving 383 at-risk individuals.
- Genotyping for the HD allele using polymerase chain reaction (PCR).
- Performance on 8 computer-driven physiological tests measuring movement speed and reaction time.
Main Results:
- Presymptomatic gene carriers (GCs) exhibited differences in movement time and auditory reaction time compared to non-carriers.
- The number of CAG trinucleotide repeats correlated with performance on specific motor tasks.
- Subtle subclinical motor function changes were detected in presymptomatic GCs.
Conclusions:
- Inheriting the HD allele is associated with early, subtle motor function alterations.
- These findings suggest potential for early diagnostic markers in Huntington disease.