ID: hyp-sda-2026-04-01-001-7
Hypothesis
FCER1G-Mediated Alternative Immune Signaling
FCER1G activation to create TREM2-bypass immune signaling through alternative receptor pathways.
EvidencePending (0%)📖 5 cit🗣 1 debates✓ 5 support✗ 1 oppose
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🧪 Overview
FCER1G activation to create TREM2-bypass immune signaling through alternative receptor pathways
🧬 Mechanism
🧬 Curated Mechanism Pathway
Curated pathway from expert analysis
flowchart TD
A["TREM2 Loss-of-Function<br/>R47H Variant or Shedding"]
B["Microglial Phagocytic Deficit<br/>Amyloid Debris Accumulation"]
C["FCER1G FcRgamma Expression<br/>Alternative Innate Immune Receptor"]
D["FCER1G Activation<br/>IgG-Opsonized Substrate Binding"]
E["ITAM Signaling via FcRgamma<br/>SYK LYN Kinase Activation"]
F["Bypass of TREM2-TYROBP<br/>Alternative DAP10/DAP12 Axis"]
G["Phagocytosis Restored<br/>TREM2-Independent Clearance"]
H["Amyloid Plaque Burden Reduced<br/>Microglial Function Preserved"]
A --> B
B -.->|"impaired clearance"| H
C --> D
D --> E
E --> F
F --> G
G --> H
style F fill:#1a237e,stroke:#4fc3f7,color:#4fc3f7
style H fill:#1b5e20,stroke:#a5d6a7,color:#a5d6a7⚖️ Evidence
⚖️ Evidence Matrix5 supports0 contradicts
Supports
TREM2 macrophage promotes cardiac repair in myocardial infarction by reprogramming metabolism via SLC25A53.
Supports
TREM2 Regulates Microglial Cholesterol Metabolism upon Chronic Phagocytic Challenge.
Supports
TREM2 Modulation Remodels the Tumor Myeloid Landscape Enhancing Anti-PD-1 Immunotherapy.
Supports
TREM2 Maintains Microglial Metabolic Fitness in Alzheimer's Disease.
📖 Linked Papers
No linked papers recorded for this hypothesis yet.
🏥 Translation
🧬 3D Protein Structure — ['FCER1G']
No curated PDB or AlphaFold mapping for ['FCER1G'] yet. Search RCSB →
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 ['FCER1G'].
Run python3 scripts/backfill_hypothesis_depmap.py to populate.
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🔮 Predictions
🔎 Predictions vs Observations2 predictions · 0 with recorded observations
| Prediction | Predicted | Observed | Status | Conf |
|---|---|---|---|---|
| IF TREM2 is pharmacologically inhibited (anti-TREM2 blocking antibody) AND FCER1G is simultaneously overexpressed via plasmid transfection in microglia-like cells, THEN phagocytic activity and inflamm | TREM2 blockade alone will reduce phagocytosis by ~40-60% and alter cytokine profiles, but co-overexpression of FCER1G will rescue these functional deficits, res | — no observation — | pending | 0.68 |
| IF FCER1G is genetically silenced (siRNA) in human macrophage cell lines, THEN phospho-SYK and phospho-SLP-65 signaling pathway activation will decrease by >50% compared to control cells within 48 hou | FCER1G knockdown will significantly reduce downstream ITAM pathway activation markers (phospho-SYK, phospho-BLAT, phospho-ERK1/2) while baseline NF-κB activity | — no observation — | pending | 0.72 |
🔮 Falsifiable Predictions (2)
pendingconf 72%
IF FCER1G is genetically silenced (siRNA) in human macrophage cell lines, THEN phospho-SYK and phospho-SLP-65 signaling pathway activation will decrease by >50% compared to control cells within 48 hours using RAW 264.7 murine macrophages and human THP-1 monocyte-derived macrophages.
Predicted outcome: FCER1G knockdown will significantly reduce downstream ITAM pathway activation markers (phospho-SYK, phospho-BLAT, phospho-ERK1/2) while baseline NF-κB
Falsification: If FCER1G knockdown produces no significant change (<20% variation) in SYK/SLP-65 phosphorylation levels, the hypothesis that FCER1G mediates alternative immune signaling through ITAM-dependent pathwa
pendingconf 68%
IF TREM2 is pharmacologically inhibited (anti-TREM2 blocking antibody) AND FCER1G is simultaneously overexpressed via plasmid transfection in microglia-like cells, THEN phagocytic activity and inflammatory cytokine production (IL-6, TNF-α) will remain at baseline levels within 72 hours using BV-2 mi
Predicted outcome: TREM2 blockade alone will reduce phagocytosis by ~40-60% and alter cytokine profiles, but co-overexpression of FCER1G will rescue these functional def
Falsification: If TREM2 inhibition causes >60% reduction in phagocytic activity AND FCER1G overexpression fails to rescue this defect (remains <50% of baseline), the hypothesis that FCER1G creates TREM2-bypass alter
▸Metadatasource: v1_phase_c_backfill · origin_type: debate_synthesis
| source | v1_phase_c_backfill |
| origin_type | debate_synthesis |
| _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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