This is the weakest mechanistic proposal. It attempts to connect extracellular apoE particle quality to intracellular ER sterol sensing through receptor-routing bias, but the debate identified no direct supporting source for the critical receptor-trafficking step.
Curated pathway from expert analysis
flowchart TD
A["APOE4 Poorly Lipidated<br/>Particles"]
B["LDLR/LRP1 Route<br/>Internalization Pathway"]
C["Neuronal APOE4<br/>Uptake Increased"]
D["Lipid Raft Signaling<br/>Amyloid Nucleation"]
E["Synaptic Failure<br/>Phosphoinositide Dysregulation"]
F["LRP1 as APOE4<br/>Therapeutic Target"]
A --> B
B --> C
C --> D
D --> E
E --> F
style A fill:#b71c1c,stroke:#ef9a9a,color:#ef9a9a
style F fill:#1b5e20,stroke:#a5d6a7,color:#a5d6a7No linked papers recorded for this hypothesis yet.
Median TPM across 13 brain regions for LRP1 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 LRP1.
Run python3 scripts/backfill_hypothesis_depmap.py to populate.
| Prediction | Predicted | Observed | Status | Conf |
|---|---|---|---|---|
| IF LRP1-mediated endocytosis of poorly lipidated APOE4 particles is genetically blocked (CRISPR knockout or dominant-negative LRP1 construct) in APOE4-targeted replacement neurons or glia, THEN endoly | Reduced endolysosomal accumulation of apoE and normalized ER cholesterol sensing metrics | — no observation — | pending | 0.35 |
| IF poorly lipidated APOE4 particles from AD patient CSF are reconstituted with physiological lipids (cholesterol + phospholipids at 1:1 molar ratio) and applied to APOE4/4 astrocytes, THEN lipidated p | Shifts in receptor preference (LDLR > LRP1) and reduced endolysosomal trapping of reconstituted particles | — no observation — | pending | 0.25 |