ID: h-fa83846f7d
Hypothesis
Microglia and complement sustain post-Aβ neurodegeneration after tau missorting is established
Aβ initiates tau missorting, but persistent degeneration is then maintained by activated microglia through C1q/C3-CR3-mediated pruning and inflammatory remodeling.
EvidencePending (0%)📖 8 cit🗣 1 debates✓ 8 support✗ 2 oppose
✓ All Quality Gates Passed
🧪 Overview
Aβ initiates tau missorting, but persistent degeneration is then maintained by activated microglia through C1q/C3-CR3-mediated pruning and inflammatory remodeling. This model best explains continued synapse loss after amyloid reduction, though it may maintain degeneration more clearly than tau polarity failure itself.
🧬 Mechanism
🧬 Curated Mechanism Pathway
Curated pathway from expert analysis
flowchart TD
A["C1Q Deficiency<br/>Impaired Clearance of Apoptotic Cells"]
B["C1QC Assembly<br/>Heterocomplex Formation"]
C["Synaptic Pruning Dysregulation<br/>Unpruned Connections"]
D["Microglial Overactivation<br/>Complement Deposition"]
E["C3b/C4b Deposition<br/>Neuronal Surface"]
F["Synaptic Loss<br/>Excessive Pruning in AD"]
G["Long-Term Potentiation<br/>Memory Formation Impaired"]
H["Cognitive Decline<br/>AD-Related Dementia"]
A --> B
B --> C
B --> D
C --> F
D --> E
E --> F
F --> G
G --> H
style A fill:#7b1fa2,stroke:#ce93d8,color:#ce93d8
style H fill:#b71c1c,stroke:#ef9a9a,color:#ef9a9a⚖️ Evidence
⚖️ Evidence Matrix8 supports2 contradicts
Supports
Microglia-mediated synapse loss is strongly implicated in AD, supporting a persistent post-amyloid pruning mechanism.
Supports
Microglia drive APOE-dependent neurodegeneration in tauopathy, showing that glial states can sustain injury downstream of primary triggers.
Supports
Tau-oligomer-associated synapse elimination by microglia and astrocytes has been observed in AD tissue.
Supports
Neurotoxic microglia promote TDP-43 proteinopathy in progranulin deficiency.
Supports
Progranulin Deficiency Promotes Circuit-Specific Synaptic Pruning by Microglia via Complement Activation.
Supports
GLP-1 Receptor Agonist NLY01 Reduces Retinal Inflammation and Neuron Death Secondary to Ocular Hypertension.
Supports
C1qB and clusterin mRNA increase in association with neurodegeneration in sporadic amyotrophic lateral sclerosis.
Supports
Differential Effects of C1qa Ablation on Glaucomatous Damage in Two Sexes in DBA/2NNia Mice.
Contradicts
Evidence supports ongoing synapse loss more than direct maintenance of dendritic tau missorting after Aβ removal.
Contradicts
Complement blockade may reduce downstream pruning without normalizing tau polarity, limiting fit to the core persistence question.
📖 Linked Papers
No linked papers recorded for this hypothesis yet.
🏥 Translation
🧬 3D Protein Structure — C1QA
🧠 GTEx v10 Brain ExpressionJSON
Median TPM across 13 brain regions for C1QA,C1QB,C1QC,C3,ITGAM,TREM2,TYROBP from GTEx v10.
💉 Clinical Trials
No clinical trials data linked to this hypothesis yet.
No curated ClinVar variants loaded for this hypothesis.
Run scripts/backfill_clinvar_variants.py to fetch P/LP/VUS variants.
No DepMap CRISPR Chronos data found for C1QA,C1QB,C1QC,C3,ITGAM,TREM2,TYROBP.
Run python3 scripts/backfill_hypothesis_depmap.py to populate.
💰 Estimated Development
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🔮 Predictions
🔎 Predictions vs Observations2 predictions · 0 with recorded observations
| Prediction | Predicted | Observed | Status | Conf |
|---|---|---|---|---|
| IF C1q/C3-CR3-mediated microglial pruning sustains synapse loss after tau missorting is established, THEN pharmacologically blocking CR3 (ITGAM) with a selective antagonist 3 months after Aβ42 oligome | Hippocampal CA1 synapse density will increase by ≥25% (measured by PSD95+VGluT1 colocalization via confocal microscopy) in CR3-blocked mice relative to vehicle- | — no observation — | pending | 0.65 |
| IF microglia activation is the obligate maintenance mechanism for post-Aβ neurodegeneration independent of tau polarity failure, THEN conditional knockout of TREM2/TYROBP specifically after tau missor | CSF neurofilament light chain (NfL) levels will stabilize (change <5%/month) in P301S;TREM2-cKO mice after tamoxifen-induced knockout, while P301S;TREM2-WT mice | — no observation — | pending | 0.58 |
🔮 Falsifiable Predictions (2)
pendingconf 65%
IF C1q/C3-CR3-mediated microglial pruning sustains synapse loss after tau missorting is established, THEN pharmacologically blocking CR3 (ITGAM) with a selective antagonist 3 months after Aβ42 oligomer injection in 5xFAD mice will significantly reduce hippocampal synapse loss compared to vehicle con
Predicted outcome: Hippocampal CA1 synapse density will increase by ≥25% (measured by PSD95+VGluT1 colocalization via confocal microscopy) in CR3-blocked mice relative t
Falsification: No statistically significant difference in synapse density between CR3-blocked and vehicle groups (p>0.05, Mann-Whitney U test), indicating that blocking complement-mediated pruning does not halt post
pendingconf 58%
IF microglia activation is the obligate maintenance mechanism for post-Aβ neurodegeneration independent of tau polarity failure, THEN conditional knockout of TREM2/TYROBP specifically after tau missorting onset (via tamoxifen-inducible CreERT2 system) will arrest neurodegeneration progression in P30
Predicted outcome: CSF neurofilament light chain (NfL) levels will stabilize (change <5%/month) in P301S;TREM2-cKO mice after tamoxifen-induced knockout, while P301S;TRE
Falsification: Equivalent rates of NfL increase in both TREM2-cKO and TREM2-WT groups (overlapping 95% CIs), indicating that removing microglial TREM2 signaling does not interrupt neurodegeneration progression despi
▸Metadatasource: v1_phase_c_backfill · origin_type: debate_synthesizer
| source | v1_phase_c_backfill |
| origin_type | debate_synthesizer |
| _schema_version | 1 |
📊 Evidence Profile
Evidence Balance
+0%
Certainty
0%
Debates
0
Incoming
0
Outgoing
0
0 supporting
0 contradicting
0 neutral
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