ID: h-652a706ec8
Hypothesis

Restoration of V-ATPase function reverses lysosomal acidification defect in AD neurons

Restoration of V-ATPase function reverses lysosomal acidification defect in AD neurons starts from the claim that modulating ATP6V1A, ATP6V0C within the disease context of neuroscience can redirect a disease-relevant process.
🧬 ATP6V1A, ATP6V0C🩺 neuroscience🎯 Composite 63%💱 $0.57▼10.2%proposed
EvidencePending (0%)📖 0 cit🗣 1 debates 3 support 2 oppose
✓ All Quality Gates Passed
Mechanistic 0.68 (15%) Evidence 0.68 (15%) Novelty 0.60 (12%) Feasibility 0.75 (12%) Impact 0.65 (12%) Druggability 0.72 (10%) Safety 0.62 (8%) Competition 0.65 (6%) Data Avail. 0.72 (5%) Reproducible 0.70 (5%) KG Connect 0.50 (8%) 0.630 composite

🧪 Overview

Mechanistic Overview


Restoration of V-ATPase function reverses lysosomal acidification defect in AD neurons starts from the claim that modulating ATP6V1A, ATP6V0C within the disease context of neuroscience can redirect a disease-relevant process. The original description reads: "## Mechanistic Overview Restoration of V-ATPase function reverses lysosomal acidification defect in AD neurons starts from the claim that modulating ATP6V1A, ATP6V0C within the disease context of neuroscience can redirect a disease-relevant process. The original description reads: "## Mechanistic Overview Restoration of V-ATPase function reverses lysosomal acidification defect in AD neurons starts from the claim that V-ATPase acidification is impaired by Aβ42-induced oxidation of the V0 sector, leading to alkalized lysosomes, decreased cathepsin activity, and substrate accumulation. This hypothesis offers the highest near-term clinical potential due to well-characterized pharmacologic targets and available assay systems for lysosomal pH measurement. Direct targeting of a fundamental acidification mechanism avoids the compensatory complexities of upstream regulators.

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🧬 Mechanism

🧬 Curated Mechanism Pathway

Curated pathway from expert analysis

flowchart TD
    A["Neuron-Specific V-ATPase Subunits<br/>ATP6V0 and ATP6V1 Composition"]
    B["Slow Lysosomal Acidification<br/>Proton Pump Kinetics Reduced"]
    C["ARL8B-SYX17 Trafficking Bottleneck<br/>Fusion-Competent Organelle Mismatch"]
    D["Late Autophagy Stall<br/>Cargo Clearance Delayed"]
    E["Proteostasis Stress<br/>Damaged Cargo Persistence"]
    F["Neuronal Vulnerability<br/>Apparent Autophagy Resistance"]
    A --> B
    B --> C
    C --> D
    D --> E
    E --> F
    style A fill:#1a237e,stroke:#4fc3f7,color:#4fc3f7
    style D fill:#b71c1c,stroke:#ef9a9a,color:#ef9a9a
    style F fill:#b71c1c,stroke:#ef9a9a,color:#ef9a9a

⚖️ Evidence

⚖️ Evidence Matrix3 supports2 contradicts
Supports
Lysosomes in AD fibroblasts and iPSC-derived neurons show elevated pH (~6.0 vs. 5.0)
Supports
V-ATPase inhibition with bafilomycin mimics Aβ-induced lysosomal dysfunction
Supports
Aβ42 directly binds to and inhibits V-ATPase in lipid bilayer studies
Contradicts
V-ATPase inhibitors (bafilomycin, concanamycin) are too toxic for systemic use; activators are poorly characterized
Contradicts
Aβ-induced V0 sector oxidation may be irreversible, limiting restoration potential
📖 Linked Papers

No linked papers recorded for this hypothesis yet.

🏥 Translation

🧬 3D Protein Structure — ATP6V1A

No curated PDB or AlphaFold mapping for ATP6V1A yet. Search RCSB →

🧠 GTEx v10 Brain ExpressionJSON

Median TPM across 13 brain regions for ATP6V1A, ATP6V0C from GTEx v10.

Cerebellar Hemisphere111 Frontal Cortex BA997.8 Cerebellum80.4 Anterior cingulate cortex BA2459.1 Hypothalamus58.4 Cortex54.4 Nucleus accumbens basal ganglia41.2 Amygdala33.1 Hippocampus31.6 Caudate basal ganglia28.6 Substantia nigra27.9 Spinal cord cervical c-127.1 Putamen basal ganglia22.4median TPM (GTEx v10)

💉 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.

🔍 Search ClinVar for ATP6V1A, ATP6V0C →

No DepMap CRISPR Chronos data found for ATP6V1A, ATP6V0C.

Run python3 scripts/backfill_hypothesis_depmap.py to populate.

💰 Estimated Development
Cost
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🏆 Tournament

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📊 Market Indicators

7d Trend
Stable
7d Momentum
▼ 1.1%
Volatility
Low
0.0029
Events (7d)
4
Price History
▼10.2%

💾 Resource Usage

LLM Tokens
26,136
$0.0784
Total Cost
$0.0784

🔮 Predictions

🔎 Predictions vs Observations2 predictions · 0 with recorded observations
PredictionPredictedObservedStatusConf
IF V-ATPase function is restored in Aβ42-treated neurons (per prediction 1), THEN cathepsin D activity will increase by ≥40% above AD-vehicle baseline within 96 hours, rescuing autophagosomal substratCathepsin D activity ≥140% of AD-vehicle control; LC3-II/LC3-I ratio normalized to ≤0.5; p62 levels decreased by ≥30%— no observation —pending0.68
IF ATP6V1A or ATP6V0C is overexpressed (or treated with V-ATPase activator) in Aβ42-exposed human iPSC-derived neurons for 48-72 hours, THEN lysosomal pH will decrease to ≤6.5 (control range) as measuLysosomal pH normalization from ~7.2 (AD phenotype) to ≤6.5 in ≥80% of treated neurons— no observation —pending0.72
🔮 Falsifiable Predictions (2)
pendingconf 72%
IF ATP6V1A or ATP6V0C is overexpressed (or treated with V-ATPase activator) in Aβ42-exposed human iPSC-derived neurons for 48-72 hours, THEN lysosomal pH will decrease to ≤6.5 (control range) as measured by Lysosensor ratiometric imaging.
Predicted outcome: Lysosomal pH normalization from ~7.2 (AD phenotype) to ≤6.5 in ≥80% of treated neurons
Falsification: Lysosomal pH remains ≥6.8 after intervention (i.e., no significant acidification rescue), indicating V-ATPase modulation does not reverse Aβ42-induced alkalinization
pendingconf 68%
IF V-ATPase function is restored in Aβ42-treated neurons (per prediction 1), THEN cathepsin D activity will increase by ≥40% above AD-vehicle baseline within 96 hours, rescuing autophagosomal substrate degradation.
Predicted outcome: Cathepsin D activity ≥140% of AD-vehicle control; LC3-II/LC3-I ratio normalized to ≤0.5; p62 levels decreased by ≥30%
Falsification: Cathepsin D activity remains <120% of AD-vehicle baseline (<1.2-fold change) and p62 levels show no significant reduction, indicating restored acidification does not translate to functional proteostas

📖 References (3)

  1. Long non-coding RNA HOTTIP promotes hypoxia-induced epithelial-mesenchymal transition of malignant glioma by regulating the miR-101/ZEB1 axis.
    ["Zhang et al.. Biomedicine & pharmacotherapy = Biomedecine & pharmacotherapie (2017)
  2. A de novo peptide hexamer with a mutable channel.
    ["Zaccai et al.. Nature chemical biology (2011)
  3. Preventive Role of Vitamin D Supplementation for Acute Phase Reaction after Bisphosphonate Infusion in Paget's Disease.
    ["Merlotti et al.. The Journal of clinical endocrinology and metabolism (2020)
Metadatasource: v1_phase_c_backfill · origin_type: debate_synthesizer
sourcev1_phase_c_backfill
origin_typedebate_synthesizer
_schema_version1
📊 Evidence Profile
Evidence Balance
+0%
Certainty
0%
Debates
0
Incoming
0
Outgoing
0
0 supporting 0 contradicting 0 neutral
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