ID: hyp-SDA-2026-04-09-gap-debate-20260409-2
Hypothesis
Vesicle Size-Selective Nanobody Penetration
Nanobodies designed with size-selective membrane penetration mechanisms could preferentially enter enlarged tau-containing vesicles while having reduced penetration into normal-sized cellular vesicles.
molecular biology
EvidencePending (0%)📖 5 cit🗣 1 debates✓ 5 support✗ 1 oppose
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🧪 Overview
Nanobodies designed with size-selective membrane penetration mechanisms could preferentially enter enlarged tau-containing vesicles while having reduced penetration into normal-sized cellular vesicles.
🧬 Mechanism
🔗 Mechanism from KG for MAPT
Auto-built from this analysis's top knowledge-graph edges.
graph TD
phosphatidylserine_exposu["phosphatidylserine exposure"] -->|associated with| APOPTOSIS["APOPTOSIS"]
pH_sensitive_membrane_fus["pH-sensitive_membrane_fusion_domain"] -->|activates| acidic_microenvironment["acidic_microenvironment"]
phosphatidylserine_bindin["phosphatidylserine-binding_domain"] -->|binds| phosphatidylserine["phosphatidylserine"]
curvature_sensitive_cell_["curvature-sensitive_cell_penetrating_peptide"] -->|penetrates| curved_membranes["curved_membranes"]
ATP_depleted_environment["ATP-depleted_environment"] -->|enables| membrane_penetration["membrane_penetration"]
tau_protein["tau_protein"] -->|interacts with| phosphatidylserine_1["phosphatidylserine"]
tau_protein_2["tau_protein"] -->|induces| membrane_curvature["membrane_curvature"]
tau_aggregation["tau_aggregation"] -->|causes| pH_acidification["pH_acidification"]
tau_aggregation_3["tau_aggregation"] -->|disrupts| cholesterol_depletion["cholesterol_depletion"]
tau_conformational_change["tau_conformational_change"] -->|triggers| membrane_disruption["membrane_disruption"]
tau_aggregation_4["tau_aggregation"] -->|causes| ATP_depletion["ATP_depletion"]
tau_aggregation_5["tau_aggregation"] -->|disrupts| membrane_asymmetry["membrane_asymmetry"]
style phosphatidylserine_exposu fill:#4fc3f7,stroke:#333,color:#000
style APOPTOSIS fill:#ce93d8,stroke:#333,color:#000
style pH_sensitive_membrane_fus fill:#4fc3f7,stroke:#333,color:#000
style acidic_microenvironment fill:#4fc3f7,stroke:#333,color:#000
style phosphatidylserine_bindin fill:#4fc3f7,stroke:#333,color:#000
style phosphatidylserine fill:#4fc3f7,stroke:#333,color:#000
style curvature_sensitive_cell_ fill:#4fc3f7,stroke:#333,color:#000
style curved_membranes fill:#4fc3f7,stroke:#333,color:#000
style ATP_depleted_environment fill:#4fc3f7,stroke:#333,color:#000
style membrane_penetration fill:#4fc3f7,stroke:#333,color:#000
style tau_protein fill:#4fc3f7,stroke:#333,color:#000
style phosphatidylserine_1 fill:#4fc3f7,stroke:#333,color:#000
style tau_protein_2 fill:#4fc3f7,stroke:#333,color:#000
style membrane_curvature fill:#4fc3f7,stroke:#333,color:#000
style tau_aggregation fill:#4fc3f7,stroke:#333,color:#000
style pH_acidification fill:#4fc3f7,stroke:#333,color:#000
style tau_aggregation_3 fill:#4fc3f7,stroke:#333,color:#000
style cholesterol_depletion fill:#4fc3f7,stroke:#333,color:#000
style tau_conformational_change fill:#4fc3f7,stroke:#333,color:#000
style membrane_disruption fill:#4fc3f7,stroke:#333,color:#000
style tau_aggregation_4 fill:#4fc3f7,stroke:#333,color:#000
style ATP_depletion fill:#4fc3f7,stroke:#333,color:#000
style tau_aggregation_5 fill:#4fc3f7,stroke:#333,color:#000
style membrane_asymmetry fill:#4fc3f7,stroke:#333,color:#000⚖️ Evidence
⚖️ Evidence Matrix5 supports0 contradicts
Supports
MAPT mutations, tauopathy, and mechanisms of neurodegeneration.
Supports
Tau-targeting antisense oligonucleotide MAPT(Rx) in mild Alzheimer's disease: a phase 1b, randomized, placebo-controlled trial.
Supports
Interactions between Microtubule-Associated Protein Tau (MAPT) and Small Molecules.
Supports
ELAVL4, splicing, and glutamatergic dysfunction precede neuron loss in MAPT mutation cerebral organoids.
Supports
The six brain-specific TAU isoforms and their role in Alzheimer's disease and related neurodegenerative dementia syndromes.
📖 Linked Papers
No linked papers recorded for this hypothesis yet.
🏥 Translation
🧬 3D Protein Structure — MAPT
💉 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 MAPT.
Run python3 scripts/backfill_hypothesis_depmap.py to populate.
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🔮 Predictions
🔎 Predictions vs Observations2 predictions · 0 with recorded observations
| Prediction | Predicted | Observed | Status | Conf |
|---|---|---|---|---|
| IF SH-SY5Y neuroblastoma cells engineered to overexpress mutant MAPT (P301L) are treated with size-selective anti-tau nanobodies for 4-6 hours, THEN the nanobodies will accumulate significantly higher | Enlarged tau-vesicles will show >60% higher nanobody fluorescence intensity compared to normal-sized vesicles, with colocalization coefficient >0.75 | — no observation — | pending | 0.55 |
| IF primary cortical neurons from PS19 tauopathy mice (expressing P301L MAPT) are treated with size-selective anti-MAPT nanobodies versus non-selective nanobodies for 24 hours, THEN size-selective nano | Size-selective nanobodies will achieve ≥2.5-fold higher enrichment in enlarged tau endosomes (≥600nm) compared to non-selective nanobodies, with <30% increase i | — no observation — | pending | 0.50 |
🔮 Falsifiable Predictions (2)
pendingconf 55%
IF SH-SY5Y neuroblastoma cells engineered to overexpress mutant MAPT (P301L) are treated with size-selective anti-tau nanobodies for 4-6 hours, THEN the nanobodies will accumulate significantly higher in enlarged tau-positive vesicles (>500nm diameter) compared to normal-sized vesicles (<300nm) with
Predicted outcome: Enlarged tau-vesicles will show >60% higher nanobody fluorescence intensity compared to normal-sized vesicles, with colocalization coefficient >0.75
Falsification: No significant difference in nanobody fluorescence between enlarged and normal-sized vesicles (difference <20%), or preferential accumulation in normal-sized vesicles
pendingconf 50%
IF primary cortical neurons from PS19 tauopathy mice (expressing P301L MAPT) are treated with size-selective anti-MAPT nanobodies versus non-selective nanobodies for 24 hours, THEN size-selective nanobodies will show preferential targeting to enlarged tau-containing endosomes while maintaining reduc
Predicted outcome: Size-selective nanobodies will achieve ≥2.5-fold higher enrichment in enlarged tau endosomes (≥600nm) compared to non-selective nanobodies, with <30%
Falsification: Size-selective nanobodies show no greater than 1.5-fold enrichment in enlarged tau endosomes compared to non-selective nanobodies, or demonstrate >50% increased penetration into normal-sized endosomes
▸Metadatasource: v1_phase_c_backfill · origin_type: debate_synthesis
| source | v1_phase_c_backfill |
| origin_type | debate_synthesis |
| _schema_version | 1 |
📊 Evidence Profile
Evidence Balance
+0%
Certainty
0%
Debates
0
Incoming
0
Outgoing
0
0 supporting
0 contradicting
0 neutral
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