Mitochondrial biogenesis
Production of new mitochondria and their oxidative machinery. mTORC1 drives it via a YY1-PGC-1alpha transcriptional program, linking growth signaling to energy production.
Building more power plants. Building new mitochondria - a cell's power plants. mTORC1 drives this process through a genetic program, linking growth signals directly to how much energy-making machinery a cell has.
Mediated partly through 4E-BP-dependent translation of TFAM and complex components; effect sizes vary strongly with cell type.
TL;DR. Mitochondrial biogenesis appears in 3 curated studies in Oliver's mTOR Atlas: 2 in animal models; 1 at the molecular level (cells, biochemistry, structure). No study in people is recorded for it in the Atlas yet. It has 2 interactions in the curated pathway model.
In the pathway model
| Interaction | Mechanism | Evidence | Studies |
|---|---|---|---|
| 4E-BP1 context-dependent Mitochondrial biogenesis mechanism: functional-consequence · this link in full · on the map table | The 4E-BP branch helps set how many mitochondrial proteins get built. In mammalian cells it holds them back; in fruit flies on a restricted diet it boosts them, so the direction depends on the organism and the diet. In mammalian cells (MOR2013) 4E-BPs repress translation of nucleus-encoded mitochondrial mRNAs, so mTORC1 raises mitochondrial output by inhibiting them; this arm is less rapamycin-sensitive than the S6K arm. In flies on dietary restriction (ZID2009) upregulated 4E-BP instead enhances translation of mitochondrial respiratory mRNAs. The sign depends on organism and nutrient state, so it is drawn as conditional. In mammalian cells (MOR2013) 4E-BPs repress translation of nucleus-encoded mitochondrial mRNAs, so mTORC1 raises mitochondrial output by inhibiting them; this arm is less rapamycin-sensitive than the S6K arm. In flies on dietary restriction (ZID2009) upregulated 4E-BP instead enhances translation of mitochondrial respiratory mRNAs. The sign depends on organism and nutrient state, so it is drawn as conditional. Holds under: Scope: mammalian cells, MOR2013. The sign holds where 4E-BP represses translation of nuclear-encoded mitochondrial mRNAs (TFAM, mitochondrial ribosomal proteins), which is why this branch survives rapamycin better than the S6K arm. It does NOT hold universally across species and nutrient states: in Drosophila under dietary restriction, ZID2009 reports that 4E-BP ENHANCES mitochondrial activity, and that this is how it extends lifespan. Treat the mammalian-cell direction as scoped, not general. not tested in people · emerging, few independent studies | M | MOR2013 conflicting: ZID2009 |
| mTORC1 activates Mitochondrial biogenesis mechanism: signal-relay · this link in full · on the map table | mTORC1 boosts the cell's mitochondria – its power plants – two ways at once: through a gene-activating complex, and by freeing up 4E-BP. mTORC1 raises mitochondrial output two ways: through a YY1-PGC-1alpha transcription complex, and by relieving 4E-BP so mitochondrial proteins get translated. mTORC1 raises mitochondrial output two ways: through a YY1-PGC-1alpha transcription complex, and by relieving 4E-BP so mitochondrial proteins get translated. Holds under: Shown in cultured cells and skeletal muscle (CUN2007) and mammalian cell lines (MOR2013). One organismal result points the other way: adipose-specific Raptor deletion raised mitochondrial respiration (POL2008), see MTORC1-OXPHOS. plausible in people, not shown directly · emerging, few independent studies | A | CUN2007, MOR2013, BEN2008 |
Evidence at a glance
| Evidence | What it means | Studies |
|---|---|---|
| A | Animal model | 2 |
| M | Molecular — cells, biochemistry, structure | 1 |
No direct human evidence in the Atlas for this entity yet — everything below rests on animal or molecular work.
Studies
| Year | Evidence | Study |
|---|---|---|
| 2026 | A | Nutrient/TOR signaling controls adipose mitochondrial transcription factor A (TFAM) to regulate organismal growth in Drosophila SRI2026 In Drosophila larvae, nutrient/TOR signaling in the fat body (a key nutrient-sensing tissue) post-transcriptionally suppresses the mitochondrial transcription factor TFAM, and this TOR→TFAM axis in fat-body tissue controls whole-body developmental growth — a mechanistic link between nutrient sensing and interorgan growth control via mitochondrial bioenergetics. |
| 2008 | A | Skeletal muscle-specific ablation of raptor, but not of rictor, causes metabolic changes and results in muscle dystrophy BEN2008 In mice, muscle-specific raptor loss (not rictor) causes dystrophy, showing mTORC1 is essential for muscle homeostasis. |
| 2007 | M | mTOR controls mitochondrial oxidative function through a YY1-PGC-1alpha transcriptional complex CUN2007 Showed mTOR isn't just about building proteins - it also runs the cell's POWER plants. mTORC1 drives mitochondrial gene expression and oxygen consumption through a YY1-PGC-1alpha transcriptional program; block mTOR with rapamycin and mitochondrial output falls. Explains part of why mTOR inhibition reshapes metabolism. |
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