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Basic Science and Pathogenesis.

Andreas Huhmer1, Zhengjian Zhang1, Vivek Budamagunta1

  • 1Nautilus Biotechnology, San Carlos, CA, USA.

Alzheimer'S & Dementia : the Journal of the Alzheimer'S Association
|December 23, 2025
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Summary
This summary is machine-generated.

Researchers used a novel single-molecule assay to analyze Tau proteoforms in Alzheimer's disease (AD) brain samples. The study revealed distinct differences in Tau phosphorylation patterns, offering potential for new AD diagnostic biomarkers.

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Area of Science:

  • Neuroscience
  • Proteomics
  • Biochemistry

Background:

  • The microtubule-associated protein Tau (MAPT) is linked to neurodegenerative diseases like Alzheimer's Disease (AD).
  • Tau exhibits extensive proteoform diversity due to splicing and post-translational modifications (PTMs).
  • The role of specific Tau proteoforms in disease progression remains largely unknown.

Purpose of the Study:

  • To investigate the Tau proteoform landscape in human brain samples using a novel single-molecule assay.
  • To quantify the diversity and abundance of Tau proteoforms and identify differences between Alzheimer's patients and controls.

Main Methods:

  • Utilized the Nautilus proteome analysis platform for single-molecule assay of Tau proteoforms.
  • Employed iterative probing with splice-variant and PTM-specific antibodies on immobilized protein molecules.
  • Quantified proteoform abundance using advanced data processing to correct for binding errors.

Main Results:

  • Analyzed brain samples from five Alzheimer's patients and two controls.
  • Revealed a complex Tau proteoform landscape with distinct phosphorylation patterns in Alzheimer's samples.
  • Observed prevalent hyperphosphorylation in Alzheimer's patients, differentiating proteoforms with minimal versus extensive modifications.

Conclusions:

  • The single-molecule platform effectively quantifies Tau proteoform heterogeneity in human brain tissue.
  • Findings enhance understanding of Tau's role in Alzheimer's Disease.
  • Tau proteoform heterogeneity shows potential for developing sensitive diagnostic biomarkers for AD.