ID: h-5c9b3fe9
Hypothesis
Polycomb-to-Trithorax Switch at Synaptic Plasticity Genes
Polycomb-to-Trithorax Switch at Synaptic Plasticity Genes.
EvidencePending (0%)📖 5 cit🗣 1 debates✓ 5 support✗ 2 oppose
⚠ Thin Description Senate Quality Gates →
🧪 Overview
Polycomb-to-Trithorax Switch at Synaptic Plasticity Genes
🧬 Mechanism
🧬 Curated Mechanism Pathway
Curated pathway from expert analysis
flowchart TD
A["PRC2 Polycomb Repressive Complex<br/>EZH2 H3K27me3 CBX Proteins"]
B["H3K27me3 Deposition<br/>Synaptic Plasticity Gene Repression"]
C["Activity-Dependent Epigenetic Switch<br/>KMT2D Trithorax Complex Recruitment"]
D["H3K4me3 Activation Mark<br/>Gene Derepression at Synaptic Loci"]
E["BDNF and ARC Expression<br/>Synaptic Plasticity Restoration"]
F["Cognitive Resilience<br/>Long-Term Potentiation Maintenance"]
G["PRC2 Overactivation<br/>Excessive H3K27me3 Blocks Plasticity Genes"]
A --> B
B --> C
C --> D
D --> E
E --> F
G -.->|"blocks"| C
style A fill:#1a237e,stroke:#4fc3f7,color:#4fc3f7
style G fill:#b71c1c,stroke:#ef9a9a,color:#ef9a9a
style F fill:#1b5e20,stroke:#81c784,color:#81c784⚖️ Evidence
⚖️ Evidence Matrix5 supports2 contradicts
Supports
Transcriptional dynamics orchestrating the development and integration of neurons born in the adult hippocampus.
Supports
c-Fos and neuronal plasticity: the aftermath of Kaczmarek's theory.
Supports
Widespread promoter methylation of synaptic plasticity genes in long-term potentiation in the adult brain in vivo.
Contradicts
Histone bivalency is central to CNS development, but developmental chromatin logic does not directly prove a late-life neurodegenerative plasticity-gene switch failure.
Contradicts
Epigenetic switches in neurodevelopment are pleiotropic and context-dependent, which weakens a narrow Polycomb-to-Trithorax causal model for neurodegeneration.
📖 Linked Papers
No linked papers recorded for this hypothesis yet.
🏥 Translation
🧬 3D Protein Structure — POLYCOMB-TO-TRITHORAX
No curated PDB or AlphaFold mapping for POLYCOMB-TO-TRITHORAX 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 Polycomb-to-Trithorax Switch at.
Run python3 scripts/backfill_hypothesis_depmap.py to populate.
💰 Estimated Development
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Timeline
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📊 Market Indicators
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Volatility
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Events (7d)
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🔮 Predictions
🔎 Predictions vs Observations2 predictions · 0 with recorded observations
| Prediction | Predicted | Observed | Status | Conf |
|---|---|---|---|---|
| IF we administer the EZH2 inhibitor GSK126 (50 mg/kg, i.p., daily for 21 days) to 5xFAD transgenic mice (an Alzheimer's disease model), THEN we will observe enhanced histone H3K4me3 at synaptic plasti | Increased H3K4me3/H3K27me3 ratio at plasticity gene promoters, elevated Arc and Egr1 protein levels in hippocampus, and ≥20% improvement in spatial memory acqui | — no observation — | pending | 0.45 |
| IF we perform chromatin immunoprecipitation sequencing (ChIP-seq) for H3K27me3 and H3K4me3 at synaptic plasticity gene promoters in hippocampal tissue from aged mice (18 months) compared to young adul | Decreased H3K27me3 (Polycomb mark) and increased H3K4me3 (Trithorax mark) at synaptic plasticity gene promoters with corresponding increased mRNA expression of | — no observation — | pending | 0.55 |
🔮 Falsifiable Predictions (2)
pendingconf 55%
IF we perform chromatin immunoprecipitation sequencing (ChIP-seq) for H3K27me3 and H3K4me3 at synaptic plasticity gene promoters in hippocampal tissue from aged mice (18 months) compared to young adults (3 months), THEN we will observe a significant decrease in H3K27me3 and a reciprocal increase in
Predicted outcome: Decreased H3K27me3 (Polycomb mark) and increased H3K4me3 (Trithorax mark) at synaptic plasticity gene promoters with corresponding increased mRNA expr
Falsification: H3K27me3 levels remain unchanged or increase at plasticity gene promoters; H3K4me3 shows no change or inverse pattern; gene expression does not correlate with chromatin changes
pendingconf 45%
IF we administer the EZH2 inhibitor GSK126 (50 mg/kg, i.p., daily for 21 days) to 5xFAD transgenic mice (an Alzheimer's disease model), THEN we will observe enhanced histone H3K4me3 at synaptic plasticity genes and improved performance on Morris water maze (reduced latency to platform by ≥20%) withi
Predicted outcome: Increased H3K4me3/H3K27me3 ratio at plasticity gene promoters, elevated Arc and Egr1 protein levels in hippocampus, and ≥20% improvement in spatial me
Falsification: No change in histone marks at plasticity genes; spatial memory performance unchanged or worsened; no detectable increase in synaptic protein expression
▸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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