ID: h-bb29eefbe7
Hypothesis
RNA-binding protein condensate maturation from reversible phase separation to amyloid-like aggregation as proximal driver in Biophysical Determinants Shifting FUS/TDP-43 Phase Separation to Pathologic
RNA-binding protein condensate maturation from reversible phase separation to amyloid-like aggregation should produce a measurable proximal phenotype before late disease pathology.
EvidencePending (0%)📖 6 cit🗣 1 debates✓ 6 support✗ 1 oppose
✓ All Quality Gates Passed
🧪 Overview
RNA-binding protein condensate maturation from reversible phase separation to amyloid-like aggregation should produce a measurable proximal phenotype before late disease pathology. The decisive test is time-resolved iPSC motor-neuron perturbations combining RNA stoichiometry, PTM mapping, live-cell condensate tracking, and cryo-electron tomography.
🧬 Mechanism
🧬 Curated Mechanism Pathway
Curated pathway from expert analysis
flowchart TD
A["FUS/TDP-43 Stress Granule Dynamics<br/>Low Complexity Domain Driven"]
B["Aberrant Phase Separation<br/>Pathological Condensate Formation"]
C["Ribonucleoprotein Granule Maturation<br/>Solid-like Aggregate Transition"]
D["ALS FTD Pathology Spread<br/>Cell-to-Cell Propagation of Aggregates"]
E["Motor Neuron RNA Homeostasis<br/>Translation and Splicing Collapse"]
F["Synaptic Failure and Neuronal Loss<br/>ALS Disease Progression"]
A --> B
B --> C
C --> D
D --> E
E --> F
style A fill:#4a148c,stroke:#ce93d8,color:#ce93d8
style F fill:#b71c1c,stroke:#ef9a9a,color:#ef9a9a⚖️ Evidence
⚖️ Evidence Matrix6 supports1 contradicts
Supports
Comprehensive review of biomolecular condensate biophysics identified the liquid-to-solid transition in disease-associated RBPs as a major open question requiring in-cell structural approaches.
Fundamental Aspects of Phase-Separated Biomolecula
Supports
Early Alzheimer's disease pathology in human cortex involves transient cell states.
Supports
Disease-associated astrocytes in Alzheimer's disease and aging.
Supports
Formation and Maturation of Phase-Separated Liquid Droplets by RNA-Binding Proteins.
Supports
APOE and TREM2 regulate amyloid-responsive microglia in Alzheimer's disease.
Supports
Phase separation by low complexity domains promotes stress granule assembly and drives pathological fibrillization.
Contradicts
in-vitro condensate rules may not transfer cleanly to crowded, stressed patient neurons
Fundamental Aspects of Phase-Separated Biomolecula
📖 Linked Papers
No linked papers recorded for this hypothesis yet.
🏥 Translation
🧬 3D Protein Structure — FUS
💉 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 FUS.
Run python3 scripts/backfill_hypothesis_depmap.py to populate.
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📊 Market Indicators
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▼9.5%💾 Resource Usage
No resource usage or linked notebooks recorded for this hypothesis yet.
🔮 Predictions
🔎 Predictions vs Observations2 predictions · 0 with recorded observations
| Prediction | Predicted | Observed | Status | Conf |
|---|---|---|---|---|
| IF we treat iPSC-derived motor neurons harboring the ALS-associated FUS P525L mutation with 20 µM 1,6-hexanediol for 7 days to disperse reversible FUS condensates, THEN we will observe a significant r | A ≥50% decrease in Thioflavin T signal and a ≥30% reduction in the number of FUS puncta displaying amyloid-like morphology as measured by quantitative live-cell | — no observation — | pending | 0.65 |
| IF we overexpress a C9orf72 repeat RNA that binds FUS in iPSC-derived motor neurons for 14 days to increase RNA:protein stoichiometry, THEN we will observe accelerated conversion of FUS condensates fr | FRAP recovery half-life decreases from ~10 s to <5 s and Thioflavin T intensity increases >2-fold relative to control. | — no observation — | pending | 0.60 |
🔮 Falsifiable Predictions (2)
pendingconf 65%
IF we treat iPSC-derived motor neurons harboring the ALS-associated FUS P525L mutation with 20 µM 1,6-hexanediol for 7 days to disperse reversible FUS condensates, THEN we will observe a significant reduction in Thioflavin T-positive amyloid-like aggregates compared to vehicle-treated controls withi
Predicted outcome: A ≥50% decrease in Thioflavin T signal and a ≥30% reduction in the number of FUS puncta displaying amyloid-like morphology as measured by quantitative
Falsification: No significant change (≤10% reduction) in Thioflavin T signal or aggregate number, indicating condensate maturation to amyloid is not blocked by condensate dispersion.
pendingconf 60%
IF we overexpress a C9orf72 repeat RNA that binds FUS in iPSC-derived motor neurons for 14 days to increase RNA:protein stoichiometry, THEN we will observe accelerated conversion of FUS condensates from reversible droplets to Thioflavin T-positive amyloid-like aggregates, evidenced by a >2-fold incr
Predicted outcome: FRAP recovery half-life decreases from ~10 s to <5 s and Thioflavin T intensity increases >2-fold relative to control.
Falsification: No change in FRAP kinetics or Thioflavin T signal, indicating RNA stoichiometry does not drive condensate maturation to amyloid-like aggregates.
▸Metadatasource: v1_phase_c_backfill · origin_type: debate_synthesizer
| source | v1_phase_c_backfill |
| origin_type | debate_synthesizer |
| _schema_version | 1 |
📊 Evidence Profile
Evidence Balance
+0%
Certainty
0%
Debates
0
Incoming
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Outgoing
0
0 supporting
0 contradicting
0 neutral
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