NAD+-Dependent Upregulation of MCT1 Expression to Restore Neuronal Ketone Metabolism
🧪 Overview
This hypothesis proposes that NAD+ precursor supplementation can restore neuronal ketone body utilization by activating SIRT1-mediated upregulation of MCT1 (monocarboxylate transporter 1). In neurodegenerative conditions, chronic PARP1 activation depletes cellular NAD+ pools, leading to reduced SIRT1 activity and subsequent downregulation of MCT1 expression. This creates a metabolic catastrophe where neurons lose their ability to efficiently transport and utilize ketone bodies as an alternative energy source when glucose metabolism is compromised. By supplementing with NAD+ precursors (such as nicotinamide riboside or NMN), cellular NAD+ levels are restored, reactivating SIRT1 deacetylase activity. SIRT1 then deacetylates key transcription factors and histone proteins at the SLC16A1 promoter region, enhancing MCT1 gene expression. The resulting increase in MCT1 protein levels on neuronal membranes restores efficient ketone body uptake, providing neurons with a critical alternative fuel source that can bypass defective glycolytic pathways.
...🧬 Mechanism
Curated pathway from expert analysis
flowchart TD
A["DNA Single-Strand Breaks<br/>Oxidative Stress in AD"]
B["PARP1 Hyperactivation<br/>PAR Polymer Synthesis"]
C["NAD+ Depletion<br/>40-60% Loss in AD"]
D["SIRT1 Inactivation<br/>Deacetylase Impaired"]
E["PGC1alpha Inactivation<br/>Mitochondrial Biogenesis Loss"]
F["Energy Failure<br/>Neuronal Death"]
G["PARP1 Inhibitor<br/>Olaparib/Veliparib"]
A --> B
B --> C
C --> D
D --> E
E --> F
G -.->|"blocks"| B
style A fill:#b71c1c,stroke:#ef9a9a,color:#ef9a9a
style F fill:#b71c1c,stroke:#ef9a9a,color:#ef9a9a
style G fill:#1a237e,stroke:#4fc3f7,color:#4fc3f7⚖️ Evidence
No linked papers recorded for this hypothesis yet.
🏥 Translation
🧬 3D Protein Structure — SLC16A1
No curated PDB or AlphaFold mapping for SLC16A1 yet. Search RCSB →
🧠 GTEx v10 Brain ExpressionJSON
Median TPM across 13 brain regions for SLC16A1 (MCT1) 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 SLC16A1 (MCT1).
Run python3 scripts/backfill_hypothesis_depmap.py to populate.
🏆 Tournament
🏆 Arenas / Elo
📊 Market Indicators
💾 Resource Usage
▸Metadatasource: v1_phase_c_backfill · origin_type: gap_debate
| source | v1_phase_c_backfill |
| origin_type | gap_debate |
| _schema_version | 1 |