Activity-Dependent CD55/CD46 Trafficking and Synaptic Surface Localization
🧪 Overview
The activity-dependent trafficking of complement regulators CD55 and CD46 to synaptic surfaces represents a dynamic regulatory mechanism controlling complement-mediated synaptic pruning through vesicular transport and membrane insertion. Rather than static differential expression, CD55 and CD46 undergo rapid, activity-dependent translocation from intracellular vesicular pools to synaptic membranes via SNARE-mediated exocytosis. High-frequency synaptic activity triggers calcium influx through NMDA receptors and voltage-gated calcium channels, activating CaMKII-dependent phosphorylation of synaptotagmin-1 and synaptotagmin-7, which serve as calcium sensors for CD55/CD46-containing vesicles. These specialized complement regulator vesicles, distinct from classical synaptic vesicles, are stored in perisynaptic endosomal compartments and contain both CD55 and CD46 pre-clustered with adaptor proteins including AP-2 and clathrin. Upon calcium-triggered fusion, these vesicles rapidly insert complement regulators into the postsynaptic membrane through interaction with SNARE proteins VAMP2/3 on vesicles and syntaxin-1/SNAP-25 complexes at target membranes.
...🧬 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 — CD55
No curated PDB or AlphaFold mapping for CD55 yet. Search RCSB →
💉 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 CD55 (DAF), CD46 (MCP).
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 |