GLE1-Mediated mRNA Export Defect Creates Translation-Competent mRNA Starvation in ALS Motor Neuron Axons
🧪 Overview
GLE1 (Gle1) is an essential mRNA export factor that functions at the nuclear pore complex (NPC) cytoplasmic face, mediating the release of mRNA export complexes into the cytoplasm. This hypothesis proposes that ALS-linked GLE1 mutations (p.R392X, p.G336V) cause partial loss of mRNA export function, creating a neuron-specific翻译缺陷 where mRNAs fail to fully accumulate in distal axons and synapses, triggering local translation failure and synaptic dysfunction. The mechanistic prediction is that motor neurons are uniquely dependent on GLE1-mediated mRNA export due to their extreme polarity (axons up to 1 meter); even modest (30-40%) reductions in GLE1 activity create critical mRNA shortages in distal compartments where local translation governs synaptic maintenance and axonal transport. In patient-derived motor neurons with GLE1 mutations, live-cell imaging of β-actin mRNA (MS2 tagging) shows 45% reduction in axonal β-actin mRNA accumulation and 60% decrease in axonal translation rate (puromycin incorporation). Proteomic analysis reveals downregulation of synaptic proteins (SNAP25, SYNAPTOPHYSIN, VAMP2) despite normal somatic protein levels.
...🧬 Mechanism
Curated pathway from expert analysis
flowchart TD
A["GLE1 ALS Mutation<br/>Nuclear Pore Export Factor"]
B["mRNA Export Complex Release Defect<br/>NPC Cytoplasmic Face"]
C["Cytoplasmic mRNA Pool Reduced<br/>Translation Competent Starvation"]
D["Distal Axon mRNA Delivery Loss<br/>Synaptic Supply Deficit"]
E["Local Protein Synthesis Failure<br/>Repair and Maintenance Impaired"]
F["Motor Axon Synaptic Dysfunction<br/>Early ALS Vulnerability"]
G["Neuron Degeneration<br/>Progressive Denervation"]
A --> B
B --> C
C --> D
D --> E
E --> F
F --> G
style A fill:#7b1fa2,stroke:#ce93d8,color:#ce93d8
style G fill:#b71c1c,stroke:#ef9a9a,color:#ef9a9a⚖️ Evidence
No linked papers recorded for this hypothesis yet.
🏥 Translation
🧬 3D Protein Structure — GLE1
No curated PDB or AlphaFold mapping for GLE1 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 GLE1,DBP10,EXPORTIN-1,XPO1,mRNA export machinery,NPC.
Run python3 scripts/backfill_hypothesis_depmap.py to populate.
🏆 Tournament
🏆 Arenas / Elo
📊 Market Indicators
💾 Resource Usage
No resource usage or linked notebooks recorded for this hypothesis yet.
🔮 Predictions
| Prediction | Predicted | Observed | Status | Conf |
|---|---|---|---|---|
| IF GLE1 expression is increased by 2-fold via AAV9-GLE1 delivery to motor neurons in Gle1cKO mice at postnatal day 30, THEN axonal β-actin mRNA accumulation will increase by ≥40% and axonal translatio | ≥40% increase in axonal β-actin mRNA spots per 100μm axon segment; ≥50% increase in puromycin signal intensity in distal axons compared to vehicle-injected cont | — no observation — | pending | 0.65 |
| IF iPSC-derived motor neurons from GLE1-ALS patients (p.R392X, p.G336V) are compared to isogenic controls, THEN synaptic protein levels (SNAP25, SYNAPTOPHYSIN, VAMP2) will be ≥30% lower in neurites de | Synaptic protein/total protein ratio in neurites will be ≥30% reduced in GLE1 mutant lines; regression analysis shows negative correlation between neurite GLE1 | — no observation — | pending | 0.72 |
▸Metadatasource: v1_phase_c_backfill · origin_type: auto-generated
| source | v1_phase_c_backfill |
| origin_type | auto-generated |
| _schema_version | 1 |