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Classification and description of frontotemporal dementias
D Neary1, J S Snowden, D M Mann
1Department of Neurology, Manchester Royal Infirmary, Manchester M13 9WL, UK. tross@central.cmht.nwest.nhs.uk
Annals of the New York Academy of Sciences
|February 24, 2001
Summary
Frontotemporal lobar degeneration (FTLD) presents diverse clinical and pathological features, challenging its classification. Research indicates FTLD is not a single entity and may not solely be a tauopathy.
Area of Science:
- Neurology
- Neuroscience
- Pathology
Background:
- Frontotemporal lobar degeneration (FTLD) encompasses distinct clinical syndromes with non-Alzheimer pathology.
- The nosological status of FTLD is debated due to diverse clinical and histopathological findings.
Purpose of the Study:
- To describe major FTLD clinical syndromes: frontotemporal dementia, progressive aphasia, and semantic dementia.
- To discuss their underlying pathologies and molecular status.
- To evaluate the classification of FTLD as a tauopathy.
Main Methods:
- Review of clinical syndromes associated with focal frontal and temporal lobe degeneration.
- Analysis of histopathological changes across FTLD subtypes.
- Examination of tau pathology and tau gene mutations in autopsy-confirmed FTLD cases.
Main Results:
- Common histopathological changes link frontotemporal dementia, progressive aphasia, and semantic dementia.
- Only 36% of FTLD cases showed tau pathology; 10% had tau gene mutations.
- FTLD exhibits significant heterogeneity in its pathological basis.
Conclusions:
- FTLD is not a unitary etiological disorder.
- Classifying FTLD solely as a tauopathy may be misleading.
- Further research is needed to understand the diverse molecular underpinnings of FTLD.