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Peter R Millar1, Stephanie Doering2, Babatunde Adeyemo3

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This summary is machine-generated.

Researchers identified three distinct Alzheimer's disease tau PET subtypes, revealing unique patterns in amyloid-beta deposition and brain connectivity. These findings offer new insights into Alzheimer's disease progression and subtypes.

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Area of Science:

  • Neuroimaging
  • Alzheimer's Disease Research
  • Biomarker Discovery

Background:

  • Distinct Alzheimer's disease (AD) phenotypes exhibit varying tau accumulation patterns detectable by PET imaging.
  • Tau spread may be influenced by neuronal network connectivity (estimated via resting-state functional connectivity MRI - RSFC) and amyloid-beta (Aβ) deposition.

Purpose of the Study:

  • To replicate previously identified tau PET subtypes in a new cohort.
  • To investigate subtype-specific differences in RSFC and Aβ PET patterns.

Main Methods:

  • Utilized the Subtype and Stage Inference (SuStaIn) model on 820 tau PET scans (18F-flortaucipir).
  • Analyzed RSFC correlations using seeds in the primary visual cortex (V1) and precuneus/posterior cingulate cortex (PCC).
  • Harmonized Aβ PET SUVRs (11C-Pittsburgh-compound-B or 18F-florbetapir) to Centiloid.

Main Results:

  • Identified three tau PET subtypes: limbic predominant (N=157), posterior predominant (N=27), and medial temporal lobe (MTL)-sparing (N=52).
  • MTL-sparing subtype showed younger age, greater impairment, and higher Aβ PET levels.
  • Posterior predominant subtype displayed distinct RSFC patterns and lower Aβ PET in anterior regions compared to limbic predominant.

Conclusions:

  • Successfully replicated three distinct spatiotemporal tau PET subtypes in an independent AD cohort.
  • Observed novel subtype-specific differences in Aβ PET spatial patterns and RSFC.
  • These findings suggest unique tau spreading mechanisms within different AD subtypes.