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Frontotemporal dementia-like phenotypes associated with presenilin-1 mutations
Mario F Mendez1, Aaron McMurtray
1Neurobehavior Unit, VA Greater Los Angeles Healthcare, CA 90073, USA. mmendez@ucla.edu
American Journal of Alzheimer'S Disease and Other Dementias
|September 5, 2006
Summary
Presenilin-1 (PS-1) mutations, a common cause of familial Alzheimer's disease (AD), can present with frontotemporal dementia (FTD)-like symptoms. These mutations create a spectrum of AD and FTD features, influenced by gene function and tau pathology.
Area of Science:
- Neuroscience
- Genetics
Background:
- Familial Alzheimer's disease (AD) is frequently caused by mutations in the presenilin-1 (PS-1) gene.
- Frontotemporal dementia (FTD) is a distinct neurodegenerative disorder characterized by behavioral and executive dysfunction.
Observation:
- Frontal behavioral changes can be the initial clinical manifestation of PS-1 mutations.
- A specific PS-1 (M233L) mutation presented with FTD-like features, alongside a review of relevant literature.
- Some PS-1 mutations are associated with Pick's bodies, a neuropathological hallmark of FTD, and can occur without amyloid plaques.
Findings:
- PS-1 mutations can lead to phenotypes that overlap between AD and FTD, both clinically and neuropathologically.
- The specific clinical presentation (AD vs. FTD) may depend on the degree of PS-1 gene loss-of-function.
- Tau pathophysiology plays a role in the manifestation of AD or FTD in PS-1 mutation carriers.
Implications:
- Understanding the PS-1 mutation spectrum is crucial for accurate diagnosis and management of familial dementia.
- This research highlights the complex interplay between genetic mutations, neuropathology, and clinical presentation in neurodegenerative diseases.
- Further research into PS-1 gene function and tau interactions may reveal new therapeutic targets for AD and FTD.
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