Enhancement of Astrocytic Ketone Body Production via HMGCS2 Overexpression
🧪 Overview
This hypothesis proposes that enhancing endogenous ketone body synthesis within astrocytes through targeted overexpression of 3-hydroxy-3-methylglutaryl-CoA synthase 2 (HMGCS2) will restore neuronal metabolic function in conditions of glucose hypometabolism. Unlike the typical hepatic ketogenesis pathway, astrocytic HMGCS2 upregulation would enable local β-hydroxybutyrate production within the brain parenchyma, creating a proximal fuel source for neighboring neurons. The mechanism involves astrocyte-specific viral vector delivery of HMGCS2, leading to increased acetyl-CoA conversion to ketone bodies within astrocytic mitochondria. These locally produced ketones would then be transported to neurons via existing monocarboxylate transporters, bypassing potential blood-brain barrier limitations and systemic ketosis requirements. This approach targets the rate-limiting step of ketogenesis directly within the CNS microenvironment, potentially providing more efficient and sustained neuronal fuel delivery compared to peripheral ketone supplementation or transport enhancement alone.
...🧬 Mechanism
Curated pathway from expert analysis
flowchart TD
A["SLC16A1 MCT1<br/>Upregulation"]
B["Ketone Body<br/>Neuronal Import"]
C["Neuronal Energy<br/>Metabolism Restoration"]
D["Mitochondrial<br/>Function Support"]
E["Neuroprotective<br/>Energy State"]
A --> B
B --> C
C --> D
D --> E
style A fill:#1b5e20,stroke:#a5d6a7,color:#a5d6a7
style E fill:#1b5e20,stroke:#a5d6a7,color:#a5d6a7⚖️ Evidence
No linked papers recorded for this hypothesis yet.
🏥 Translation
🧬 3D Protein Structure — HMGCS2
No curated PDB or AlphaFold mapping for HMGCS2 yet. Search RCSB →
🧠 GTEx v10 Brain ExpressionJSON
Median TPM across 13 brain regions for HMGCS2 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 HMGCS2.
Run python3 scripts/backfill_hypothesis_depmap.py to populate.
🏆 Tournament
🏆 Arenas / Elo
📊 Market Indicators
💾 Resource Usage
🔮 Predictions
| Prediction | Predicted | Observed | Status | Conf |
|---|---|---|---|---|
| IF we overexpress astrocytic HMGCS2 via AAV9-GFAP-HMGCS2 in 3xTg-AD mice at 8 months of age, THEN hippocampal 18F-FDG PET signal will increase by >15% within 8 weeks, AND cortical NAD+/NADH ratio will | Hippocampal glucose metabolic rate elevated by >15% and neuronal energy markers (ATP, NAD+/NADH) increased by >20% | — no observation — | pending | 0.58 |
| IF we selectively overexpress HMGCS2 in astrocytes of aged APP/PS1 mice using AAV5-GFAP-HMGCS2 (vs. AAV5-GFAP-mCherry control), THEN cortical β-hydroxybutyrate concentrations will increase by >50% wit | Cortical β-hydroxybutyrate elevation (>50%) and significant cognitive improvement (>30% in platform localization latency) | — no observation — | pending | 0.65 |
▸Metadatasource: v1_phase_c_backfill · origin_type: gap_debate
| source | v1_phase_c_backfill |
| origin_type | gap_debate |
| _schema_version | 1 |