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Structure-based classification of tauopathies.

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|September 30, 2021
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The study reveals distinct tau filament structures in neurodegenerative diseases like PSP and AGD, proposing a new classification system for tauopathies based on these unique protein folds.

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Area of Science:

  • Neuroscience
  • Biochemistry
  • Structural Biology

Background:

  • Tauopathies are neurodegenerative diseases characterized by the aggregation of tau protein into filaments.
  • Distinct tau filament structures have been previously identified in Alzheimer's disease, Pick's disease, CTE, and CBD.

Purpose of the Study:

  • To elucidate the structural diversity of tau filaments in various tauopathies.
  • To establish a hierarchical classification of tauopathies based on tau filament structures.

Main Methods:

  • Cryo-electron microscopy was employed to determine the high-resolution structures of tau filaments from diverse tauopathy cases.
  • Comparative structural analysis was performed to identify similarities and differences in tau filament folds.

Main Results:

  • A novel three-layered tau filament fold was identified in progressive supranuclear palsy (PSP).
  • Globular glial tauopathy shares similar tau filament structures with PSP.
  • Argyrophilic grain disease (AGD) exhibits a distinct four-layered fold, similar to corticobasal degeneration, and is also found in aging-related tau astrogliopathy.
  • MAPT gene mutations associated with AGD suggest a link between tau overproduction and the AGD fold.
  • Familial British and Danish dementias share tau filament structures with Alzheimer's disease and primary age-related tauopathy.

Conclusions:

  • The structural classification of tau filaments provides a new framework for understanding tauopathies.
  • This classification complements existing diagnostic and neuropathological methods.
  • The study identified intermediate filament structures in a PSP case, suggesting a potential new tauopathy entity.