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Cognitive and motor functioning in gene carriers for Huntington's disease: a baseline study
Marie-Noëlle W Witjes-Ané1, Maria Vegter-van der Vlis, Jeroen P P van Vugt
1Leiden University Medical Center, Department of Neurology, Leiden, The Netherlands. m.n.w.witjes-ane@lumc.nl
The Journal of Neuropsychiatry and Clinical Neurosciences
|January 31, 2003
Summary
Early Huntington's disease gene carriers show subtle cognitive and motor declines. These findings in pre-symptomatic individuals highlight the need for longitudinal studies to track disease progression.
Area of Science:
- Neuroscience
- Genetics
- Neurology
Background:
- Huntington's disease (HD) is an inherited neurodegenerative disorder.
- Early detection of functional changes is crucial for understanding HD progression.
- Identifying pre-symptomatic changes can inform therapeutic strategies.
Purpose of the Study:
- To investigate the earliest cognitive and motor functioning changes in individuals carrying the Huntington's disease gene (HD gene carriers).
- To compare cognitive and motor performance between HD gene carriers and non-gene carriers before clinical diagnosis.
Main Methods:
- Cross-sectional comparison of 46 HD gene carriers with 88 non-gene carriers.
- Assessment using the Benton Visual Retention Test for cognitive function.
- Evaluation of motor functioning through single reaction time measures, with adjustments for existing motor signs.
Main Results:
- HD gene carriers performed significantly worse on the Benton Visual Retention Test compared to non-gene carriers.
- This cognitive difference was primarily driven by a subset of participants already experiencing impairment.
- Minor differences in motor timing were observed after accounting for motor signs.
Conclusions:
- Subtle cognitive deficits, particularly in visual retention, may be detectable in pre-symptomatic Huntington's disease.
- Motor function changes are less pronounced or masked in early stages.
- Longitudinal research is essential to clarify the trajectory of functional decline and address inconsistencies in current findings.