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Autosomal dominant dementia with widespread neurofibrillary tangles
L A Reed1, T J Grabowski, M L Schmidt
1Department of Pathology, University of Iowa Hospitals and Clinics, Iowa City 52242, USA.
Annals of Neurology
|October 24, 1997
Summary
This study identifies a rare, early-onset dementia in a Midwestern family with autosomal dominant inheritance. Neuropathology revealed abundant tau-rich neurofibrillary tangles but no amyloid plaques, suggesting a distinct disease entity.
Area of Science:
- Neurology
- Genetics
- Pathology
Background:
- Familial dementias with atypical features are rare.
- Neurofibrillary lesions are seldom the sole neuropathologic hallmark.
Purpose of the Study:
- To characterize a novel familial dementia syndrome.
- To investigate the genetic and neuropathologic basis of this disorder.
Main Methods:
- Pedigree analysis across four generations.
- Clinical assessment of affected individuals.
- Post-mortem neuropathologic examination including immunohistochemistry and electron microscopy.
Main Results:
- A pedigree of 15 individuals with early-onset autosomal dominant dementia and long disease duration was identified.
- Neuropathology showed abundant intraneuronal neurofibrillary tangles (NFTs) primarily in subcortical regions, with absent amyloid plaques.
- NFTs contained paired helical filaments and recognized various tau epitopes.
Conclusions:
- The described familial dementia presents a unique clinical and neuropathologic profile.
- The absence of amyloid plaques and specific tau pathology suggests this may represent a distinct neurodegenerative disease entity.
- Further research is warranted to elucidate the genetic underpinnings and precise classification of this disorder.