Low-micromolar systemic SCFA exposure is unlikely to directly drive substantia nigra alpha-synuclein clearance, but colon and enteric nervous system compartments experience much higher local exposure and may show reduced pS129-alpha-syn, lower seeding pressure, and delayed gut-to-brain propagation. This is the strongest translationally credible hypothesis because it matches exposure reality and explains why dietary or microbiome interventions could matter without requiring pharmacologic brain concentrations.
Curated pathway from expert analysis
flowchart TD
A["SNCA Alpha-Synuclein<br/>Presynaptic Protein"]
B["SNCA Misfolding<br/>Environmental Stress"]
C["SNCA Oligomers<br/>Toxic Protofibrils"]
D["Mitochondrial Pore<br/>Membrane Disruption"]
E["Lewy Body Formation<br/>Cytoplasmic Inclusions"]
F["Dopaminergic Neuron<br/>Dysfunction/Death"]
G["Nigrostriatal Degeneration<br/>Motor Symptoms"]
H["SNCA A53T/A30P/E46K<br/>Familial PD Mutations"]
A --> B
B --> C
C --> D
C --> E
D --> F
E --> F
F --> G
H -.->|"accelerates"| B
style A fill:#1a237e,stroke:#4fc3f7,color:#4fc3f7
style C fill:#b71c1c,stroke:#ef9a9a,color:#ef9a9a
style G fill:#b71c1c,stroke:#ef9a9a,color:#ef9a9a
style H fill:#7b1fa2,stroke:#ce93d8,color:#ce93d8No linked papers recorded for this hypothesis yet.
Median TPM across 13 brain regions for SNCA from GTEx v10.
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 SNCA.
Run python3 scripts/backfill_hypothesis_depmap.py to populate.
| Prediction | Predicted | Observed | Status | Conf |
|---|---|---|---|---|
| IF SNCA transgenic mice receive equivalent-dose SCFA supplementation via oral gavage versus intracerebroventricular (ICV) minipump infusion for 8 weeks, THEN oral but not ICV-administered SCFA will re | Oral SCFA group: colon pS129-alpha-syn reduced by ≥40% (vs. vehicle); ICV SCFA group: colon pS129-alpha-syn reduced by ≤15% (vs. vehicle), with no significant d | — no observation — | pending | 0.55 |
| IF germ-free mice colonized with human gut microbiota receive oral SCFA supplementation (sodium propionate, butyrate, and acetate at 10-40 mM in drinking water for 8 weeks), THEN colonic pS129-alpha-s | Colonic pS129-alpha-syn reduced by ≥30% at week 4-6; substantia nigra pS129-alpha-syn reduced by ≤10% at week 6 | — no observation — | pending | 0.65 |