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Related Experiment Video

Updated: Dec 28, 2025

In Vitro Aggregation Assays Using Hyperphosphorylated Tau Protein
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Bacterial DNA promotes Tau aggregation.

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  • 1Human Microbiology Institute, New York, NY, 10013, USA. g.tetz@hmi-us.com.

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Microbial DNA, particularly from bacteria found in the brain, may promote tau protein misfolding and aggregation, contributing to Alzheimer's disease (AD) pathogenesis. This suggests a potential link between microbial DNA and neurodegenerative diseases like AD.

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Area of Science:

  • Neuroscience
  • Microbiology
  • Genetics

Background:

  • Alzheimer's disease (AD) and tauopathies are characterized by tau protein misfolding and aggregation in the brain.
  • Misfolded tau aggregates are neurotoxic, leading to synaptic loss and neuronal damage.
  • The mechanisms initiating tau misfolding and aggregation remain largely unknown.

Purpose of the Study:

  • To investigate the effect of DNA from prokaryotic and eukaryotic cells on tau misfolding and aggregation.
  • To explore the potential role of microbial DNA in Alzheimer's disease pathogenesis.

Main Methods:

  • Extraction of DNA from diverse prokaryotic and eukaryotic cells.
  • Evaluation of the impact of extracted DNA on tau protein misfolding and aggregation in vitro.
  • Comparison of tau aggregation induced by bacterial DNA versus eukaryotic DNA.

Main Results:

  • Bacterial DNA, from both gram-positive and gram-negative species, induced more pronounced tau misfolding than eukaryotic DNA.
  • DNA from specific bacterial species previously found in AD patients' samples (brain, CSF, oral cavity) showed a higher effect in promoting tau aggregation.
  • This suggests microbial DNA may be a significant factor in tau pathology progression.

Conclusions:

  • Microbial DNA may play a previously unrecognized role in the propagation of tau protein misfolding and Alzheimer's disease.
  • Compromised blood-brain and intestinal barriers could allow microbial DNA entry into the central nervous system (CNS).
  • These findings open new avenues for therapeutic interventions targeting microbial DNA in AD treatment.