TREM2-Mediated Spatial Redistribution of Complement Regulators Controls Synaptic Vulnerability
🧪 Overview
TREM2 signaling controls the spatial distribution of complement regulators CD55 and CD46 on synaptic membranes, determining which synapses are vulnerable to complement-mediated pruning. Under normal conditions, TREM2 activation promotes the expression and clustering of CD55/CD46 at perisomatic inhibitory synapses through DAM pathway signaling, while maintaining low regulator density at distal excitatory synapses. This creates a protective gradient where inhibitory circuits are preserved while allowing physiological pruning of excitatory connections. In TREM2 haploinsufficiency states, this spatial control breaks down—CD55/CD46 redistribution becomes dysregulated, leading to inappropriate complement activation at previously protected inhibitory synapses. The mechanism involves TREM2-dependent regulation of PSD-95 and gephyrin scaffolding proteins, which control CD55/CD46 membrane anchoring. When TREM2 signaling is compromised, PSD-95-mediated competitive inhibition of complement regulators extends aberrantly to inhibitory synapses, while the normal gephyrin-facilitated clustering of CD55/CD46 is lost.
...🧬 Mechanism
Curated pathway from expert analysis
flowchart TD
A["CD55 DAF, CD46 MCP<br/>Hypothesis Target"]
B["Complement<br/>Cited Mechanism"]
C["Cellular Response<br/>Stress or Clearance Change"]
D["Neural Circuit Effect<br/>Synapse/Glia Vulnerability"]
E["Neurodegeneration<br/>Disease-Relevant Outcome"]
A --> B
B --> C
C --> D
D --> E
style A fill:#1a237e,stroke:#4fc3f7,color:#4fc3f7
style B fill:#b71c1c,stroke:#ef9a9a,color:#ef9a9a
style E fill:#b71c1c,stroke:#ef9a9a,color:#ef9a9a⚖️ Evidence
No linked papers recorded for this hypothesis yet.
🏥 Translation
🧬 3D Protein Structure — TREM2
🧠 GTEx v10 Brain ExpressionJSON
Median TPM across 13 brain regions for TREM2 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 TREM2.
Run python3 scripts/backfill_hypothesis_depmap.py to populate.
🏆 Tournament
🏆 Arenas / Elo
📊 Market Indicators
💾 Resource Usage
▸Metadatasource: v1_phase_c_backfill · origin_type: debate_synthesizer
| source | v1_phase_c_backfill |
| origin_type | debate_synthesizer |
| _schema_version | 1 |