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Dutch hereditary cerebral amyloid angiopathy: structural lesions and apolipoprotein E genotype
M Bornebroek1, J Haan, S G Van Duinen
1Department of Neurology, Leiden University Hospital, the Netherlands.
Insights
The apolipoprotein E genotype does not influence amyloid-related brain damage in hereditary cerebral hemorrhage with amyloidosis-Dutch type. This finding is crucial for understanding disease progression and potential therapeutic targets.
Area of Science:
- Neurology
- Genetics
- Pathology
Background:
- Hereditary cerebral hemorrhage with amyloidosis-Dutch type (HCHWA-D) results from a mutation in the beta-amyloid precursor protein gene.
- The condition presents with strokes and dementia, pathologically marked by cerebral plaques and amyloid angiopathy.
Purpose of the Study:
- To examine the relationship between radiological and pathological brain lesions and apolipoprotein E (APOE) genotype in HCHWA-D patients.
- To determine if APOE genotype affects the severity or type of amyloid-related lesions.
Main Methods:
- Magnetic resonance imaging (MRI) was used to assess white matter hyperintensities and focal lesions in 25 HCHWA-D patients.
- Histopathological analysis of brain tissue from 8 patients examined cerebrovascular amyloid angiopathy and plaques.
- APOE genotyping was performed for all participants.
Main Results:
- No association was found between white matter hyperintensity scores or focal lesions on MRI and the APOE epsilon4 allele.
- The number and type of cerebral plaques did not correlate with the APOE genotype.
- All patients exhibited severe amyloid angiopathy across all investigated cortical areas.
Conclusions:
- The APOE genotype does not appear to modulate the development or severity of amyloid-related structural lesions in HCHWA-D.
- These findings suggest that other genetic or environmental factors may play a more significant role in lesion development in this disease.
Abstract:
Hereditary cerebral hemorrhage with amyloidosis-Dutch type is caused by a mutation at codon 693 of the beta amyloid precursor protein gene. The disease is clinically characterized by strokes and dementia. In addition to cerebral plaques, cerebral amyloid angiopathy is the pathological hallmark. We investigated the correlation between radiological (white matter hyperintensities and focal lesions on magnetic resonance images) and pathological lesions (cerebrovascular amyloid angiopathy and plaques) and the apolipoprotein E genotype in patients with the disease. Twenty-five patients were studied using magnetic resonance imaging, and brain tissue from 8 patients was studied histopathologically. Neither the white matter hyperintensity scores nor the number of focal lesions on magnetic resonance images were associated with the presence of an epsilon4 allele. Nor was a correlation found between the number and type of plaques and the apolipoprotein E genotype. All patients had severe amyloid angiopathy in all cortical areas investigated. This study showed that the apolipoprotein E genotype does not modulate amyloid-related structural lesions in hereditary cerebral hemorrhage with amyloidosis of the Dutch type.