Disentangling tau and brain atrophy cluster heterogeneity across the Alzheimer's disease continuum

for the Alzheimer’s Disease Neuroimaging Initiative

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Introduction: Neuroimaging heterogeneity in dementia has been examined using single modalities. We evaluated the associations of magnetic resonance imaging (MRI) atrophy and flortaucipir positron emission tomography (PET) clusters across the Alzheimer's disease (AD) spectrum. Methods: We included 496 Alzheimer's Disease Neuroimaging Initiative participants with brain MRI, flortaucipir PET scan, and amyloid beta biomarker measures obtained. We applied a novel robust collaborative clustering (RCC) approach on the MRI and flortaucipir PET scans. We derived indices for AD-like (SPARE-AD index) and brain age (SPARE-BA) atrophy. Results: We identified four tau (I–IV) and three atrophy clusters. Tau clusters were associated with the apolipoprotein E genotype. Atrophy clusters were associated with white matter hyperintensity volumes. Only the hippocampal sparing atrophy cluster showed a specific association with brain aging imaging index. Tau clusters presented stronger clinical associations than atrophy clusters. Tau and atrophy clusters were partially associated. Conclusions: Each neuroimaging modality captured different aspects of brain aging, genetics, vascular changes, and neurodegeneration leading to individual multimodal phenotyping.

Original languageEnglish (US)
Article numbere12305
JournalAlzheimer's and Dementia: Translational Research and Clinical Interventions
Volume8
Issue number1
DOIs
StatePublished - 2022

Keywords

  • Alzheimer's disease
  • amyloid beta
  • heterogeneity
  • mangetic resonance imaging
  • positron emission tomography
  • prognosis
  • tau

ASJC Scopus subject areas

  • Clinical Neurology
  • Psychiatry and Mental health

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