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Primary progressive aphasia (PPA) shows distinct amygdala atrophy patterns based on tau type. Three-repeat (3R) tauopathy causes greater left amygdala atrophy than four-repeat (4R) tauopathy in PPA patients.

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Area of Science:

  • Neuroscience
  • Neuropathology
  • Radiology

Background:

  • Primary progressive aphasia (PPA) is a dementia characterized by language decline.
  • PPA can stem from frontotemporal lobar degeneration with tau pathology (FTLD-tau), specifically 3R tau or 4R tau.
  • Limbic region atrophy, particularly in the amygdala, may contribute to clinical differences in 3R and 4R FTLD-tau.

Purpose of the Study:

  • To investigate the distribution of atrophy across amygdala subregions in PPA patients with 3R and 4R FTLD-tau.
  • To compare amygdala subregion volumes between different tauopathies and controls.

Main Methods:

  • Structural MRI scans from 18 PPA patients (9 with 3R FTLD-tau, 9 with 4R FTLD-tau) and 35 age-matched controls were analyzed.
  • Amygdala subregions were parcellated using FreeSurfer software.
  • Mixed linear regressions were employed to compare amygdala subregion volumes, adjusting for disease duration.

Main Results:

  • PPA patients with 3R tau exhibited significantly smaller left amygdala volumes compared to controls.
  • PPA patients with 4R tau showed reduced volumes in specific left amygdala subregions (paralaminar and corticoamygdaloid transition area).
  • Compared to 4R tauopathy, 3R tauopathy demonstrated greater atrophy in the whole left amygdala and specific nuclei (lateral, cortical).

Conclusions:

  • The study highlights leftward asymmetry in PPA-related disease.
  • Distinct amygdala subregion atrophy patterns differentiate 3R and 4R FTLD-tau.
  • These findings support the link between amygdalar circuit disruption and divergent neuropsychiatric symptoms in FTLD-tauopathies.