TFEB-Mediated Retromer Biogenesis to Restore Endosomal-Lysosomal Trafficking in Aged Synapses
🧪 Overview
This hypothesis proposes that TFEB activation can restore synaptic function in aging by simultaneously upregulating both lysosomal biogenesis and retromer complex components, creating a coordinated enhancement of the endosomal-lysosomal trafficking network. While TFEB is well-established as a master regulator of lysosomal genes, emerging evidence suggests it also controls expression of retromer components including VPS35, VPS26, and VPS29. In aged synapses, both lysosomal capacity and retromer-mediated protein sorting are compromised, leading to accumulation of misfolded proteins, defective autophagy, and synaptic dysfunction. By pharmacologically or genetically activating TFEB, we can trigger transcriptional upregulation of the entire endosomal-lysosomal machinery as a unified system. This approach leverages TFEB's broad transcriptional control to coordinate multiple trafficking processes rather than targeting individual components in isolation.
...🧬 Mechanism
Curated pathway from expert analysis
flowchart TD
A["mTORC1 Hyperactivation<br/>Nutrient/Growth Signals"]
B["TFEB Phosphorylation<br/>Ser211 by mTORC1"]
C["14-3-3 Sequestration<br/>Cytoplasmic Retention"]
D["Lysosomal Biogenesis<br/>Blocked"]
E["Autophagic Flux<br/>Impaired"]
F["Tau/Amyloid Aggregate<br/>Accumulation"]
G["TFEB Activation<br/>Rapamycin or MCOLN1"]
H["Nuclear TFEB<br/>CLEAR Gene Expression"]
G --> H
H -.->|"rescues"| D
A --> B
B --> C
C --> D
D --> E
E --> F
style A fill:#b71c1c,stroke:#ef9a9a,color:#ef9a9a
style F fill:#b71c1c,stroke:#ef9a9a,color:#ef9a9a
style G fill:#1a237e,stroke:#4fc3f7,color:#4fc3f7
style H fill:#1b5e20,stroke:#81c784,color:#81c784⚖️ Evidence
No linked papers recorded for this hypothesis yet.
🏥 Translation
🧬 3D Protein Structure — TFEB
No curated PDB or AlphaFold mapping for TFEB yet. Search RCSB →
🧠 GTEx v10 Brain ExpressionJSON
Median TPM across 13 brain regions for TFEB 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 TFEB.
Run python3 scripts/backfill_hypothesis_depmap.py to populate.
🏆 Tournament
🏆 Arenas / Elo
📊 Market Indicators
💾 Resource Usage
🔮 Predictions
| Prediction | Predicted | Observed | Status | Conf |
|---|---|---|---|---|
| IF aged hippocampal neurons (DIV60+) are treated with a TFEB activator (e.g., trehalose 100mM or V-ajmaline 10μM for 48-72 hours) THEN both retromer complex proteins (VPS35, VPS26, VPS29) and lysosoma | Coordinated ≥50% protein upregulation of VPS35/VPS26/VPS29 AND LAMP1/cathepsin D measured by quantitative western blot, with matching mRNA increases by qRT-PCR | — no observation — | pending | 0.65 |
| IF aged cortical neurons (DIV60+) undergo TFEB activation (genetic overexpression via AAV-hTFEB or pharmacologic with Bromo9 20μM for 7 days) THEN surface AMPA receptor GluA1 subunit localization will | ≥40% increase in surface GluA1 (biotinylation assay) and ≥30% increase in mEPSC frequency (without change in amplitude) measured by whole-cell patch clamp | — no observation — | pending | 0.55 |
▸Metadatasource: v1_phase_c_backfill · origin_type: gap_debate
| source | v1_phase_c_backfill |
| origin_type | gap_debate |
| _schema_version | 1 |