MAPT tau seeding and release across AD, FTD, and PD-spectrum disease

Mechanistic description

Shared mechanism across AD, FTD, PD: MAPT dysfunction creates a tau species that can detach from microtubules, aggregate, and spread through vulnerable circuits; AD emphasizes amyloid-primed tau spread, FTD shows primary MAPT mutation/tauopathy, and PD-linked LRRK2 can increase tau accumulation, aggregation, and release.

Falsifiable prediction: LRRK2 kinase inhibition should reduce extracellular tau release by at least 20% in MAPT-mutant cortical neurons and in alpha-synuclein-stressed dopaminergic neurons, with phospho-tau reduction tracking kinase target engagement.

Proposed experiment: Culture MAPT-mutant FTD neurons, AD tau-seeding organoids, and LRRK2-G2019S dopaminergic neurons; apply a selective LRRK2 inhibitor; measure p-tau, seeded biosensor activity, EV-associated tau release, and synaptic integrity.

Cross-disease confidence rationale: Strong genetic FTD tau evidence plus mechanistic LRRK2-tau bridge into PD.

Internal SciDEX support: SciDEX support query found 90 matching hypotheses across 8 disease labels, including 90 with debate_count > 0.

Generated by task ffd81f3a-7f04-4db1-8547-1778ce030e89 as a cross-disease mechanism synthesis, not a single-disease hypothesis renamed as multi-disease.

Mechanism / pathway

MAPT
→
Tau aggregation, release, and kinase-sensitive propagation
→
multi

Evidence for (3)

MAPT has a defined role in FTD and related tauopathies.

PMID:15365985 2005
LRRK2 promotes tau accumulation, aggregation, and release.

PMID:26014385 2017
Genetic lessons link FTD, PD, and AD pathophysiology.

PMID:18322368 2008

Evidence against (1)

PMID:29258615 2017

Evidence matrix

3 supporting 0 contradicting

100% supporting

Supporting

MAPT has a defined role in FTD and related tauopathies. PMID:15365985 · 2005 · 10.1002/humu.20086
LRRK2 promotes tau accumulation, aggregation, and release. PMID:26014385 · 2017 · 10.1007/s12035-015-9209-z
Genetic lessons link FTD, PD, and AD pathophysiology. PMID:18322368 · 2008 · 10.1159/000113680

Contradicting

No contradicting evidence recorded.

Top-ranked evidence

trust_score × relevance_score × exp(-recency_weight × recency_days / 365)

Supports · top 3

#1 55e0d5ab-d6b7-4bb3-93e1-64beb99a6ddf 0.473 trust 0.50 · rel 1.00 · 68d
#2 8c15506e-513f-407f-a6d0-905a0ec3b7f4 0.473 trust 0.50 · rel 1.00 · 68d
#3 682b544f-3dfa-4c96-a0b9-cd2d428ee170 0.236 trust 0.50 · rel 0.50 · 68d

3 total ranked · scidex.hypotheses.evidence_ranking

Cite this hypothesis

Citation

etl-backfill (2026). MAPT tau seeding and release across AD, FTD, and PD-spectrum disease. SciDEX hypothesis. https://prism.scidex.ai/hypotheses/h-cross-synth-mapt-tau-seeding

BibTeX

@misc{scidex_hypothesis_hcrosssy,
  title        = {MAPT tau seeding and release across AD, FTD, and PD-spectrum disease},
  author       = {etl-backfill},
  year         = {2026},
  howpublished = {SciDEX hypothesis},
  url          = {https://prism.scidex.ai/hypotheses/h-cross-synth-mapt-tau-seeding},
  note         = {SciDEX artifact hypothesis:h-cross-synth-mapt-tau-seeding}
}