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VLDL receptor polymorphism, cognitive impairment, and dementia
N Helbecque1, C Berr, D Cottel
1INSERM U508, Institut Pasteur de Lille, France.
Neurology
|May 9, 2001
Summary
The VLDLR-5-repeat allele is linked to an increased risk of dementia, especially when vascular risk factors are present. This suggests a genetic component in dementia development influenced by vascular health.
Area of Science:
- Neuroscience
- Genetics
- Epidemiology
Background:
- Vascular risk factors are increasingly linked to cognitive impairment.
- The apolipoprotein E (APOE) receptor pathway, including the very low-density lipoprotein receptor (VLDLR), is a potential mechanism.
- Previous research suggests a connection between cognitive decline and APOE.
Purpose of the Study:
- To investigate the association between a specific genetic variation in the VLDLR gene and cognitive function.
- To determine if the VLDLR gene's triplet repeat polymorphism impacts dementia risk.
Main Methods:
- Two independent studies were conducted: a population-based study (221 dementia cases, 249 controls) and a clinical study (124 dementia cases, 179 controls).
- The impact of a polymorphic triplet repeat in the VLDLR gene on cognitive function was assessed.
Main Results:
- The VLDLR-5-repeat allele was associated with a significantly increased risk of dementia in the population study (OR, 1.9).
- This finding was independently confirmed in the clinical study (OR, 8.1).
- The association was more pronounced in individuals with mixed or vascular dementia compared to Alzheimer's disease patients.
Conclusions:
- The VLDLR-5-repeat allele may represent a genetic susceptibility factor for dementia.
- This genetic factor appears particularly relevant in individuals with co-existing vascular risk factors.
- The findings highlight the role of vascular risk factors in the pathogenesis of dementia.