{"ranked_hypotheses": [{"title": "CSF ApoE- and clusterin-rich lipoprotein particles stabilize disease-relevant alpha-synuclein fibril polymorphs", "description": "Specific lipoprotein particles bind fibril surfaces and preserve polymorph architecture and seeding fidelity outside the cellular environment.", "target_gene": "APOE", "dimension_scores": {"evidence_strength": 0.57, "novelty": 0.68, "feasibility": 0.73, "therapeutic_potential": 0.56, "mechanistic_plausibility": 0.72, "druggability": 0.42, "safety_profile": 0.52, "competitive_landscape": 0.64, "data_availability": 0.63, "reproducibility": 0.59}, "composite_score": 0.606, "evidence_for": [{"claim": "Purifiable CSF lipoprotein fractions create a clear structural and seeding test path.", "pmid": ""}], "evidence_against": [{"claim": "Effects could collapse to generic crowding unless purified fractions show specificity.", "pmid": ""}]}, {"title": "Ganglioside-rich extracellular vesicles preserve alpha-synuclein fibril conformation in CSF", "description": "Membrane-derived cofactors in extracellular vesicles maintain polymorph fidelity and templating competence.", "target_gene": "SNCB", "dimension_scores": {"evidence_strength": 0.54, "novelty": 0.7, "feasibility": 0.67, "therapeutic_potential": 0.58, "mechanistic_plausibility": 0.69, "druggability": 0.4, "safety_profile": 0.51, "competitive_landscape": 0.61, "data_availability": 0.58, "reproducibility": 0.54}, "composite_score": 0.582, "evidence_for": [{"claim": "EV fractionation and lipid perturbation directly test membrane-cofactor dependence.", "pmid": ""}], "evidence_against": [{"claim": "Mixed vesicle preparations can blur specificity and overstate the mechanism.", "pmid": ""}]}, {"title": "Sulfated glycans and metal-binding CSF proteins brace alpha-synuclein fibril polymorphs", "description": "Electrostatic bridging by glycans and low-abundance proteins preserves disease-relevant fibril architecture.", "target_gene": "SNCA", "dimension_scores": {"evidence_strength": 0.42, "novelty": 0.62, "feasibility": 0.59, "therapeutic_potential": 0.45, "mechanistic_plausibility": 0.52, "druggability": 0.34, "safety_profile": 0.49, "competitive_landscape": 0.55, "data_availability": 0.47, "reproducibility": 0.44}, "composite_score": 0.489, "evidence_for": [{"claim": "Binding proteomics plus depletion-rescue could reveal a low-abundance structural cofactor class.", "pmid": ""}], "evidence_against": [{"claim": "The mechanism remains too diffuse without isolation of a named molecular species.", "pmid": ""}]}], "knowledge_edges": [{"source_id": "APOE", "source_type": "gene", "target_id": "SNCA_fibril_polymorph", "target_type": "structure", "relation": "stabilizes"}, {"source_id": "SNCA", "source_type": "gene", "target_id": "extracellular_vesicle_membrane", "target_type": "structure", "relation": "interacts_with"}], "synthesis_summary": "The debate converged on CSF cofactors with concrete biochemical identity rather than generic bulk CSF effects. Lipoprotein particles and extracellular vesicles ranked highest because they can be purified, perturbed, and tested directly for effects on fibril polymorph stability and seeding fidelity.\n\nThe next experiments should be causal fractionation and add-back studies, not another descriptive omics screen. Once a stabilizing cofactor is isolated, the same factor can inform both mechanism and biomarker stratification for synucleinopathy subtypes."}