🧪
hypothesis

K48/K63 ubiquitin chain balance separates causal from compensatory states in: How do ALS-linked UBQLN2 mutations affect its ubiquitylation-dependent stability and

Hypothesis

K48/K63 ubiquitin chain balance separates causal from compensatory states in: How do ALS-linked UBQLN2 mutations affect its ubiquitylation-dependent stability and

A longitudinal biomarker panel centered on K48/K63 ubiquitin chain balance can distinguish harmful mechanisms from protective adaptation.
🧬 K48/K63 ubiquitin chain balance🩺 neurodegeneration🎯 Composite 33%💱 $0.56▼1.7%active
EvidencePending (0%)📖 6 cit🗣 2 debates✓ 6 support✗ 1 oppose
✓ All Quality Gates Passed
🏆 ChallengeValidate K48/K63 ubiquitin chain balance as therapeutic target in ALS$500 →
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arXiv PreprintNeurIPSNature MethodsPLOS ONE
📖 Export BibTeXinteract with this hypothesis
Composite33%

🧪 Overview

A longitudinal biomarker panel centered on K48/K63 ubiquitin chain balance can distinguish harmful mechanisms from protective adaptation. The decisive experiment is to measure K48/K63 ubiquitin chain balance before and after phase-separation modifiers in stratified models.

🧬 Mechanism

🧬 Curated Mechanism Pathway

Curated pathway from expert analysis

flowchart TD
    A["K48/K63 ubiquitin chain balance<br/>Hypothesis Target"]
    B["Pathway Dysregulation<br/>Cited Mechanism"]
    C["Cellular Response<br/>Stress or Clearance Change"]
    D["Neural Circuit Effect<br/>Synapse/Glia Vulnerability"]
    E["ALS<br/>Disease-Relevant Outcome"]
    A --> B
    B --> C
    C --> D
    D --> E
    style A fill:#1a237e,stroke:#4fc3f7,color:#4fc3f7
    style B fill:#b71c1c,stroke:#ef9a9a,color:#ef9a9a
    style E fill:#b71c1c,stroke:#ef9a9a,color:#ef9a9a

⚖️ Evidence

⚖️ Evidence Matrix5 supports1 contradicts
Supports
Stress granule homeostasis is modulated by TRIM21-mediated ubiquitination of G3BP1 and autophagy-dependent elimination of stress granules.
Autophagy2023PMID:36692217medium
Supports
Ripks and Neuroinflammation.
Mol Neurobiol2024PMID:38349514medium
Supports
Rsp5/NEDD4 and ESCRT regulate TDP-43 toxicity and turnover via an endolysosomal clearance mechanism.
J Cell Biol2026PMID:41498748medium
Supports
Listerin promotes cGAS protein degradation through the ESCRT pathway to negatively regulate cGAS-mediated immune response.
Proc Natl Acad Sci U S A2023PMID:38109536medium
Supports
Loss of C9orf72 perturbs the Ran-GTPase gradient and nucleocytoplasmic transport, generating compositionally diverse Importin β-1 granules.
Cell Rep2023PMID:36821445medium
Contradicts
causal direction requires longitudinal perturbation
skeptic_round
📖 Linked Papers (15)Export BibTeX ↗
Rsp5/NEDD4 and ESCRT regulate TDP-43 toxicity and turnover via an endolysosomal clearance mechanism.
The Journal of cell biology (2026) · PubMed:41498748 ↗
14 figures
Figure 1.
Figure 1.
A dot-blot genetic screen in yeast identifies genes regulating TDP-43 steady-state levels. (A) Schematic representation of the dot-blot genetic screen. (B) E...
Figure 2.
Figure 2.
TDP-43 clearance and aggregation depend on ESCRT function. (A) Indicated strains were transformed with TDP-43-mRuby2 plasmid (pRB194) and grown to mid-logarith...
Stress granule homeostasis is modulated by TRIM21-mediated ubiquitination of G3BP1 and autophagy-dependent elimination of stress granules.
Autophagy (2023) · PubMed:36692217 ↗
1 figure
Figures
Figures
Figures available at source paper (no open-access XML found).
Rsp5/NEDD4 and ESCRT regulate TDP-43 toxicity and turnover via an endolysosomal clearance mechanism.
The Journal of cell biology (2026) · PubMed:41498748 ↗
No figures
Ripks and Neuroinflammation.
Molecular neurobiology (2024) · PubMed:38349514 ↗
No figures
Ripks and Neuroinflammation.
Molecular neurobiology (2024) · PubMed:38349514 ↗
No figures
Upregulation of NF-κB by USP24 aggravates ferroptosis in diabetic cardiomyopathy.
Free Radic Biol Med (2024) · PubMed:38056575 ↗
No figures
Listerin promotes cGAS protein degradation through the ESCRT pathway to negatively regulate cGAS-mediated immune response.
Proceedings of the National Academy of Sciences of the United States of America (2023) · PubMed:38109536 ↗
No figures
Listerin promotes cGAS protein degradation through the ESCRT pathway to negatively regulate cGAS-mediated immune response.
Proceedings of the National Academy of Sciences of the United States of America (2023) · PubMed:38109536 ↗
No figures
Lipocalin 2 regulates mitochondrial phospholipidome remodeling, dynamics, and function in brown adipose tissue in male mice.
Nat Commun (2023) · PubMed:37872178 ↗
No figures
Loss of C9orf72 perturbs the Ran-GTPase gradient and nucleocytoplasmic transport, generating compositionally diverse Importin β-1 granules.
Cell reports (2023) · PubMed:36821445 ↗
No figures
Loss of C9orf72 perturbs the Ran-GTPase gradient and nucleocytoplasmic transport, generating compositionally diverse Importin β-1 granules.
Cell reports (2023) · PubMed:36821445 ↗
No figures
Stress granule homeostasis is modulated by TRIM21-mediated ubiquitination of G3BP1 and autophagy-dependent elimination of stress granules.
Autophagy (2023) · PubMed:36692217 ↗
No figures

🏥 Translation

🧬 3D Protein Structure — K48

No curated PDB or AlphaFold mapping for K48 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.

🔍 Search ClinVar for K48 →

No DepMap CRISPR Chronos data found for K48.

Run python3 scripts/backfill_hypothesis_depmap.py to populate.

🏆 Tournament

🏆 Arenas / Elo

No arena matches recorded yet. Browse Arenas →

📊 Market Indicators

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💾 Resource Usage

No resource usage or linked notebooks recorded for this hypothesis yet.

🔮 Predictions

🔎 Predictions vs Observations2 predictions · 0 with recorded observations
PredictionPredictedObservedStatusConf
IF chain balance is actionable, THEN correcting K48/K63 balance will reduce persistent G3BP1-positive stress granules by >=35% within 48 hours after oxidative stress.Chain-balance intervention lowers persistent G3BP1 stress-granule fraction >=35% versus mutant untreated cells.— no observation —pending0.56
IF K48/K63 ubiquitin chain balance separates causal from compensatory UBQLN2 states, THEN ALS-linked mutants will shift the K63:K48 chain ratio by >=30% before stress-granule persistence appears.K63:K48 ubiquitin chain ratio changes >=30% at a timepoint preceding stress-granule persistence in mutant motor neurons.— no observation —pending0.61
🔮 Falsifiable Predictions (2)
pendingconf 61%
IF K48/K63 ubiquitin chain balance separates causal from compensatory UBQLN2 states, THEN ALS-linked mutants will shift the K63:K48 chain ratio by >=30% before stress-granule persistence appears.
Predicted outcome: K63:K48 ubiquitin chain ratio changes >=30% at a timepoint preceding stress-granule persistence in mutant motor neurons.
Falsification: Chain ratio changes <10% or changes only after persistent stress granules are already established.
pendingconf 56%
IF chain balance is actionable, THEN correcting K48/K63 balance will reduce persistent G3BP1-positive stress granules by >=35% within 48 hours after oxidative stress.
Predicted outcome: Chain-balance intervention lowers persistent G3BP1 stress-granule fraction >=35% versus mutant untreated cells.
Falsification: Persistent stress granules fall <10% despite validated chain-ratio correction.
View on SciDEX ↗