From Analysis:
Biophysical Determinants Shifting FUS/TDP-43 Phase Separation to Pathological Aggregates
What are the biophysical determinants — RNA binding stoichiometry, post-translational modifications, crowding agents — that shift FUS and TDP-43 from functional liquid-liquid phase-separated condensates to irreversible amyloid-like aggregates, and can in-cell cryo-electron tomography resolve the structural transitions in patient-derived iPSC motor neurons?
Symmetric dimethylation of arginine residues in the FUS RGG1/RGG2 domains by PRMT5/PRMT1 maintains FUS in a dynamic liquid phase-separated state by reducing inter-molecular beta-sheet propensity. ALS-linked mutations near the RGG domains reduce arginine methylation efficiency, shifting FUS toward an aggregation-prone unmethylated state. PRMT5 activator treatment in FUS-ALS iPSC motor neurons should restore arginine methylation stoichiometry and increase the concentration required for pathological aggregation by >3-fold.
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Curated pathway diagram from expert analysis
flowchart TD
A["FUS RGG1 RGG2 Domains
RNA-Binding Protein in Motor Neurons"]
B["PRMT1 and PRMT5 Activity
Symmetric Dimethylarginine on RGG Repeats"]
C["Dynamic Liquid Phase Separation
Inter-molecular Beta-Sheet Propensity Reduced"]
D["ALS-Linked FUS Mutations
Near RGG Domains"]
E["Reduced Arginine Methylation Efficiency
Unmethylated FUS Accumulates"]
F["Increased Beta-Sheet Propensity
Aggregation-Prone Confirmation"]
G["Insoluble FUS Amyloid Aggregates
ALS FTD Pathology"]
H["PRMT5 Activator Treatment
Restores Methylation Stoichiometry"]
A --> B
B --> C
D --> E
E --> F
F --> G
H -.->|"3-fold aggregation threshold increase"| B
style D fill:#7b1fa2,stroke:#ce93d8,color:#ce93d8
style G fill:#b71c1c,stroke:#ef9a9a,color:#ef9a9a
style H fill:#1b5e20,stroke:#a5d6a7,color:#a5d6a7
Theorist position for analysis 52661eaf-79f8-4647-8f48-3389f5af4d59: Biophysical Determinants Shifting FUS/TDP-43 Phase Separation to Pathological Aggregates
Source basis: Fundamental Aspects of Phase-Separated Biomolecular Condensates (Chemical Reviews, 2024, DOI 10.1021/acs.chemrev.4c00138). The stored gap context says: 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.
Primary hypothesis: RNA-binding protein condensate maturation from reversible ph
Skeptic critique for analysis 52661eaf-79f8-4647-8f48-3389f5af4d59: Biophysical Determinants Shifting FUS/TDP-43 Phase Separation to Pathological Aggregates
The source paper motivates the gap, but motivation is not causal evidence. The main threat is that the observed association in Fundamental Aspects of Phase-Separated Biomolecular Condensates could be downstream of disease stage, tissue composition, survival bias, or batch structure. The specific concern here is: in-vitro condensate rules may not transfer cleanly to crowded, stressed patient neurons.
The debate should reject any claim tha
Domain expert assessment for analysis 52661eaf-79f8-4647-8f48-3389f5af4d59: Biophysical Determinants Shifting FUS/TDP-43 Phase Separation to Pathological Aggregates
The practical path is feasible but should be staged. Stage 1 should reanalyze or collect human data at the needed resolution, preserving pathology, sex/genotype, region, and disease-stage covariates when relevant. Stage 2 should test RNA-binding protein condensate maturation from reversible phase separation to amyloid-like aggregation in a model where the proximal readout can be measured before overt toxicity. Stage 3 should conne
{
"ranked_hypotheses": [
{
"title": "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 Pathological Aggregates",
"description": "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 tr
No clinical trials data available
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Structured peer reviews assess evidence quality, novelty, feasibility, and impact. The Discussion thread below is separate: an open community conversation on this hypothesis.
No DepMap CRISPR Chronos data found for FUS.
Run python3 scripts/backfill_hypothesis_depmap.py to populate.
No curated ClinVar variants loaded for this hypothesis.
Run scripts/backfill_clinvar_variants.py to fetch P/LP/VUS variants.
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No knowledge graph edges recorded
neurodegeneration | 2026-04-27 | open
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