This hypothesis proposes that microglial TREM2 activation serves as a master regulator that coordinates both synaptic pruning and oligodendrocyte precursor cell (OPC) maturation to restore structural connectome integrity. TREM2-activated microglia would function as central orchestrators, using their synaptic pruning machinery to identify damaged or dysfunctional neural circuits while simultaneously releasing specific trophic factors and cytokines that promote OPC differentiation into mature oligodendrocytes at sites of identified damage. The mechanism involves TREM2 signaling cascades that enhance microglial phagocytic capacity for clearing synaptic debris and myelin fragments, while triggering the release of pro-myelination factors such as IGF-1, PDGF-AA, and specific extracellular matrix proteins. This dual-function approach leverages the spatial precision of microglial synaptic surveillance to target OPC activation specifically where structural connectivity has been compromised.
...Curated pathway from expert analysis
flowchart TD
A["Amyloid-beta Plaques<br/>Phospholipid Ligands"]
B["TREM2 Receptor<br/>Ligand Binding"]
C["TYROBP/DAP12<br/>ITAM Phosphorylation"]
D["SYK Kinase<br/>Activation"]
E["PLCG2<br/>IP3 + DAG Generation"]
F["Ca2+ Release<br/>Cytoskeletal Remodeling"]
G["Microglial Phagocytosis<br/>Plaque Compaction"]
A --> B
B --> C
C --> D
D --> E
E --> F
F --> G
style A fill:#b71c1c,stroke:#ef9a9a,color:#ef9a9a
style G fill:#1b5e20,stroke:#81c784,color:#81c784No linked papers recorded for this hypothesis yet.
Median TPM across 13 brain regions for TREM2 from GTEx v10.
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.
| Prediction | Predicted | Observed | Status | Conf |
|---|---|---|---|---|
| IF TREM2 is selectively activated in microglia via AAV-mediated overexpression or agonist treatment in the cuprizone-induced demyelination model (C57BL/6J mice, 8-12 weeks old), THEN there will be a m | ≥30% increase in mature oligodendrocytes and g-ratio normalization to ≥0.75 in TREM2-activated mice compared to vehicle controls | — no observation — | pending | 0.65 |
| IF TREM2 is genetically deleted specifically in microglia (Cx3cr1-Cre; TREM2-flox mice) in the same cuprizone demyelination model, THEN white matter microstructure will remain disrupted with sustained | Microglial TREM2 knockout will result in ≥0.15 unit lower FA values in the corpus callosum and ≥25% worse Rotarod performance compared to TREM2-flox littermate | — no observation — | pending | 0.60 |