ID: h-ba57f3d3ed
Hypothesis
LYTL and JIP4-dependent lysosomal remodeling may show mutant-selective amplification even when bulk phospho-Rab changes are modest
A more mechanistic but less translationally mature possibility is that G2019S does not strongly alter total phospho-Rab abundance during swelling, yet still enhances downstream lysosomal tubulation and sorting outputs.
EvidencePending (0%)📖 6 cit🗣 1 debates✓ 6 support✗ 2 oppose
✓ All Quality Gates Passed
🧪 Overview
A more mechanistic but less translationally mature possibility is that G2019S does not strongly alter total phospho-Rab abundance during swelling, yet still enhances downstream lysosomal tubulation and sorting outputs. This survives as a secondary phenotype worth measuring, especially if normalized to total phospho-Rab signal, but the debate did not support it as the primary disease thesis.
🧬 Mechanism
🧬 Curated Mechanism Pathway
Curated pathway from expert analysis
flowchart TD
A["LRRK2 G2019S Mutation<br/>Hyperactive Kinase"]
B["Rab8a/Rab10/Rab12<br/>Hyperphosphorylation"]
C["Endolysosomal Trafficking<br/>Disruption"]
D["Lysosomal Enlargement<br/>Impaired Acidification"]
E["Autophagic Flux<br/>Impairment"]
F["Alpha-Synuclein<br/>Aggregate Accumulation"]
G["Dopaminergic Neuron<br/>Vulnerability"]
A --> B
B --> C
C --> D
D --> E
E --> F
F --> G
style A fill:#b71c1c,stroke:#ef9a9a,color:#ef9a9a
style G fill:#b71c1c,stroke:#ef9a9a,color:#ef9a9a⚖️ Evidence
⚖️ Evidence Matrix6 supports2 contradicts
Supports
LRRK2 drives JIP4 recruitment, lysosomal tubulation, and vesicle sorting downstream of Rab phosphorylation.
Supports
Forced membrane localization of LRRK2 is sufficient to induce RAB10, RAB12, and JIP4 signaling, and pathogenic mutants can show additive effects.
Supports
LRRK2 and Parkinson's disease: from genetics to targeted therapy.
Supports
LRRK2 in Parkinson's disease: upstream regulation and therapeutic targeting.
Supports
Lysosomal positioning regulates Rab10 phosphorylation at LRRK2(+) lysosomes.
Contradicts
Most LYTL evidence comes from overexpression or acute lysosomal injury paradigms rather than endogenous mutant-specific volume sensing.
Contradicts
More tubules may reflect injury, cargo burden, or microtubule effects rather than selective amplification downstream of volume sensing.
📖 Linked Papers
No linked papers recorded for this hypothesis yet.
🏥 Translation
🧬 3D Protein Structure — JIP4
No curated PDB or AlphaFold mapping for JIP4 yet. Search RCSB →
💉 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 JIP4,LRRK2,RAB10,RAB35.
Run python3 scripts/backfill_hypothesis_depmap.py to populate.
💰 Estimated Development
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🔮 Predictions
🔎 Predictions vs Observations2 predictions · 0 with recorded observations
| Prediction | Predicted | Observed | Status | Conf |
|---|---|---|---|---|
| IF human iPSC-derived dopaminergic neurons carrying the G2019S LRRK2 mutation are subjected to lysosomal swelling stress (nigericin treatment), THEN lysosomal tubulation events will be significantly a | G2019S mutant neurons show ≥40% increase in lysosomal tubulation events per cell when normalized to bulk p-Rab10 signal versus isogenic wild-type controls after | — no observation — | pending | 0.55 |
| IF JIP4 expression is knocked down by siRNA in G2019S mutant neurons, THEN the previously observed mutant-selective amplification of lysosomal tubulation will be abolished, with tubulation levels retu | JIP4 knockdown eliminates the G2019S-specific increase in lysosomal tubulation, reducing normalized tubulation events to levels statistically indistinguishable | — no observation — | pending | 0.50 |
🔮 Falsifiable Predictions (2)
pendingconf 55%
IF human iPSC-derived dopaminergic neurons carrying the G2019S LRRK2 mutation are subjected to lysosomal swelling stress (nigericin treatment), THEN lysosomal tubulation events will be significantly amplified (≥40% increase) in mutant cells compared to isogenic controls when normalized to total phos
Predicted outcome: G2019S mutant neurons show ≥40% increase in lysosomal tubulation events per cell when normalized to bulk p-Rab10 signal versus isogenic wild-type cont
Falsification: No significant difference (p>0.05) in normalized lysosomal tubulation frequency between G2019S and wild-type neurons, or tubulation actually decreases in mutant cells
pendingconf 50%
IF JIP4 expression is knocked down by siRNA in G2019S mutant neurons, THEN the previously observed mutant-selective amplification of lysosomal tubulation will be abolished, with tubulation levels returning to wild-type baseline, within 72 hours of transfection.
Predicted outcome: JIP4 knockdown eliminates the G2019S-specific increase in lysosomal tubulation, reducing normalized tubulation events to levels statistically indistin
Falsification: JIP4 knockdown does not abolish the mutant-selective tubulation amplification, or G2019S neurons retain ≥40% higher tubulation versus wild-type after JIP4 siRNA treatment
▸Metadatasource: v1_phase_c_backfill · origin_type: debate_synthesizer
| source | v1_phase_c_backfill |
| origin_type | debate_synthesizer |
| _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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