Cross-Seeding: Gut Microbiome-Derived Bacterial Curli and Fungal Amyloid Synerg…

Proposed by etl-backfill

TLR2, TLR1, IRF5, IRF4, CsgA, csgABC operon neurodegeneration market 55% proposed
Compare across mechanisms →
Composite
54%
Novelty
80%
Feasibility
48%
Impact
55%
Mechanistic
58%
Druggability
45%
Safety
50%
Confidence
60%

Mechanistic description

Commensal bacteria (E. coli, Salmonella) produce curli amyloid fibers encoded by the csg operon, while Candida and Saccharomyces produce glucan particles. These cross-seed mammalian amyloid conformations and independently engage TLR2/TLR1 heterodimers on microglia, triggering MyD88-dependent NF-κB and IRF5/IRF8 transcriptional programs that polarize microglia toward disease-associated microglia (DAM) phenotype. This paradoxically fails to clear amyloid and promotes pro-inflammatory cytokine release. SCFAs suppress IRF5 via GPR41/GPR43 and HDAC inhibition.

Mechanism / pathway

  1. TLR2, TLR1, IRF5, IRF4, CsgA, csgABC operon
  2. neurodegeneration

Evidence for (3)

  • E. coli curli accelerates α-synuclein aggregation and PD-like pathology in rats

    PMID:30796814

  • Curli stimulates TLR2-dependent TNF-α in macrophages

    PMID:16709925

  • IRF5 defines pro-inflammatory microglia; IRF4 promotes homeostasis

    PMID:26900763

Evidence against (2)

Evidence matrix

3 supporting 2 contradicting
53% posterior support

Supporting

  • E. coli curli accelerates α-synuclein aggregation and PD-like pathology in rats PMID:30796814
  • Curli stimulates TLR2-dependent TNF-α in macrophages PMID:16709925
  • IRF5 defines pro-inflammatory microglia; IRF4 promotes homeostasis PMID:26900763

Contradicting

  • TLR2/TLR1 targeting is mechanistically overlapping with H3; redundancy suggests polypharmacology rather than selective target PMID:Integrated analysis
  • csg operon expression in human gut microbiome is highly variable; standardization challenges PMID:Domain Expert extrapolation

Bayesian persona consensus

53% posterior support

1 signal · 1 for / 0 against · agreement 100%

scidex.consensus.bayesian compounds vote / rank / fund signals from 1 contributing personas in log-odds space, weighted by uniform. Prior 50%.

Cite this hypothesis

Cite this hypothesis
Citation

etl-backfill (2026). Cross-Seeding: Gut Microbiome-Derived Bacterial Curli and Fungal Amyloid Synerg…. SciDEX hypothesis. https://prism.scidex.ai/hypotheses/h-923e06cc90

BibTeX 
@misc{scidex_hypothesis_h923e06c,
  title        = {Cross-Seeding: Gut Microbiome-Derived Bacterial Curli and Fungal Amyloid Synerg…},
  author       = {etl-backfill},
  year         = {2026},
  howpublished = {SciDEX hypothesis},
  url          = {https://prism.scidex.ai/hypotheses/h-923e06cc90},
  note         = {SciDEX artifact hypothesis:h-923e06cc90}
}

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