ID: h-04780f23
Hypothesis
Neuronal Hypersensitivity to Feedback Inhibition by p62/Sequestosome-1 Accumulation
Upon autophagy induction, neurons uniquely accumulate p62/SQSTM1 due to inefficient recognition of polyubiquitinated aggregates, creating an mTORC1-activating domain (MAZ)-mediated feedback loop that terminates the autophagic response pr.
EvidencePending (0%)📖 0 cit🗣 1 debates✓ 5 support✗ 1 oppose
✓ All Quality Gates Passed
🧪 Overview
Upon autophagy induction, neurons uniquely accumulate p62/SQSTM1 due to inefficient recognition of polyubiquitinated aggregates, creating an mTORC1-activating domain (MAZ)-mediated feedback loop that terminates the autophagic response prematurely. This hypothesis was substantially weakened by SKEPTIC critique due to mechanistic non-uniqueness and lack of demonstrated neuronal specificity in the p62 accumulation response compared to other cell types.
🧬 Mechanism
🧬 Curated Mechanism Pathway
Curated pathway from expert analysis
graph TD
A["Autophagy induction in neurons"] --> B["p62/SQSTM1 accumulation due to inefficient polyubiquitin tagging"]
B --> C["MAZ domain-mediated premature mTORC1 reactivation"]
C --> D["Early autophagic response termination"]
D --> E["Incomplete aggregate and damaged organelle clearance"]
E --> F["Neuronal proteostatic stress and dysfunction"]⚖️ Evidence
⚖️ Evidence Matrix5 supports1 contradicts
Supports
Morphine-induced RACK1-dependent autophagy in immortalized neuronal cell lines.
Supports
β-Arrestin2 oligomers impair the clearance of pathological tau and increase tau aggregates.
Supports
The role of mitophagy in the regulation of mitochondrial energetic status in neurons.
Supports
PSEN2 (presenilin 2) mutants linked to familial Alzheimer disease impair autophagy by altering Ca(2+) homeostasis.
Contradicts
Hypothesis lacks demonstrated neuronal specificity in p62 accumulation mechanism
📖 Linked Papers
No linked papers recorded for this hypothesis yet.
🏥 Translation
🧬 3D Protein Structure — SQSTM1
No curated PDB or AlphaFold mapping for SQSTM1 yet. Search RCSB →
🧠 GTEx v10 Brain ExpressionJSON
Median TPM across 13 brain regions for SQSTM1 (p62), mTORC1, TRAF6 from 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.
No DepMap CRISPR Chronos data found for SQSTM1 (p62), mTORC1, TRAF6.
Run python3 scripts/backfill_hypothesis_depmap.py to populate.
🏆 Tournament
🏆 Arenas / Elo
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🔮 Predictions
🔎 Predictions vs Observations2 predictions · 0 with recorded observations
| Prediction | Predicted | Observed | Status | Conf |
|---|---|---|---|---|
| IF VPS34 activator (SAX1 analog, 10μM) is administered to p62-accumulating neurons to bypass the MAZ-mediated mTORC1 feedback loop, THEN autophagic flux (measured by LC3-II turnover + mCherry-GFP-LC3 | >50% increase in autophagic flux and >30% reduction in ubiquitin-positive aggregates after 24h VPS34 activation | — no observation — | pending | 0.30 |
| IF primary cortical neurons and age-matched astrocytes are treated with identical autophagy inducers (rapamycin 100nM for 6h), THEN neurons will exhibit significantly greater p62/SQSTM1 accumulation ( | p62 protein levels will increase >2-fold in neurons but <1.2-fold in astrocytes at 6h post-induction | — no observation — | pending | 0.35 |
🔮 Falsifiable Predictions (2)
pendingconf 35%
IF primary cortical neurons and age-matched astrocytes are treated with identical autophagy inducers (rapamycin 100nM for 6h), THEN neurons will exhibit significantly greater p62/SQSTM1 accumulation (>2-fold increase by immunoblot) compared to astrocytes, demonstrating unique neuronal hypersensitivi
Predicted outcome: p62 protein levels will increase >2-fold in neurons but <1.2-fold in astrocytes at 6h post-induction
Falsification: Equivalent or lesser p62 accumulation in neurons compared to astrocytes would disprove neuronal specificity of the accumulation mechanism
pendingconf 30%
IF VPS34 activator (SAX1 analog, 10μM) is administered to p62-accumulating neurons to bypass the MAZ-mediated mTORC1 feedback loop, THEN autophagic flux (measured by LC3-II turnover + mCherry-GFP-LC3 clearance) will increase >50% and ubiquitinated aggregate clearance will improve within 24h, compare
Predicted outcome: >50% increase in autophagic flux and >30% reduction in ubiquitin-positive aggregates after 24h VPS34 activation
Falsification: No significant improvement in autophagic flux or aggregate clearance following mTORC1 feedback interruption would disprove the proposed feedback mechanism
▸Metadatasource: v1_phase_c_backfill · origin_type: gap_debate
| source | v1_phase_c_backfill |
| origin_type | gap_debate |
| _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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