MOTS-c: The Mitochondrial-Derived Peptide Research Guide
A peptide coded by your mitochondria, not your nucleus. What MOTS-c is, how it acts on metabolism, and what the exercise studies found.
| Full name | Mitochondrial open reading frame of the 12S rRNA type-c |
|---|---|
| Length | 16 amino acids |
| Sequence | MRWQEMGYIFYPRKLR |
| Encoded by | Mitochondrial DNA (12S rRNA gene region) |
| Discovered | 2015 (Lee et al., Cell Metabolism) |
| Main pathway | Folate cycle, AICAR, AMPK activation |
| Hero product | MOTS-c |
Almost every protein in your body is coded by DNA in the cell nucleus. Mitochondria, the cell’s power plants, keep a tiny genome of their own, and for a long time it was thought to code for just 13 proteins. Then researchers found short hidden genes inside it. MOTS-c is one of them: a 16-amino-acid peptide that appears to act as a signal from mitochondria to the rest of the body.
This guide covers how MOTS-c was discovered, how it works, and what the metabolism and exercise research reports.
Origin story: a gene hiding in mitochondrial DNA
MOTS-c was described in 2015 by Changhan Lee, Pinchas Cohen and colleagues. They found a short open reading frame inside the mitochondrial 12S rRNA gene that coded a 16-amino-acid peptide. In mice, the peptide acted mainly on skeletal muscle and improved how the body handled glucose (Lee et al., 2015). MOTS-c joined humanin as one of the first known mitochondrial-derived peptides.
How MOTS-c works
Folate cycle and AMPK
In the discovery work, MOTS-c inhibited the folate cycle, which led to a build-up of AICAR, a natural molecule that activates AMPK. AMPK is the cell’s energy sensor. When it’s switched on, cells take up more glucose and burn more fat (Lee et al., 2015).
A signal to the nucleus
Under metabolic stress, MOTS-c moves from the cytoplasm into the nucleus, where it influences the expression of genes involved in stress responses and antioxidant defense (Kim et al., 2018). That makes it an unusual case of mitochondria directly influencing nuclear genes.
Key studies
| Study | Model | Finding |
|---|---|---|
| Lee et al., 2015 | Mice on a high-fat diet | MOTS-c prevented diet-induced obesity and insulin resistance |
| Kim et al., 2018 | Human cells under stress | MOTS-c moved to the nucleus and regulated stress-response genes |
| Reynolds et al., 2021 | Humans and aged mice | Exercise raised MOTS-c levels in human muscle and plasma. Treating older mice improved physical performance |
The exercise link is one of the most interesting findings. Reynolds et al. reported that MOTS-c levels in human skeletal muscle rose sharply during exercise and that MOTS-c treatment improved physical capacity in mice of several ages, which is why researchers describe it as a possible exercise mimetic.
MOTS-c vs GLP-class compounds
MOTS-c and incretin compounds like semaglutide both show up in metabolic research, but they work in completely different ways:
| MOTS-c | GLP-class (e.g. Hero SM, TZ, RT) | |
|---|---|---|
| Target | Intracellular (folate cycle, AMPK) | Cell-surface GPCRs |
| Main tissue | Skeletal muscle | Pancreas, gut, brain, liver |
| Appetite effect | Not a main feature | Central to mechanism |
| Human trial data | Very limited | Extensive |
Weak spots: what we don’t know
- Human data are early. Most evidence comes from mice and cells. A MOTS-c analog entered early clinical testing, but large trials haven’t been published.
- Short half-life. The native peptide is cleared quickly, which complicates study design.
- Measurement. Assays for circulating MOTS-c vary, which makes studies hard to compare.
Handling MOTS-c in the lab
Hero MOTS-c ships lyophilized in 10 mg vials. Reconstitute with bacteriostatic water following our reconstitution guide. For example, 10 mg in 2 mL gives 5 mg/mL. Use the peptide calculator for syringe units and keep the solution refrigerated.
MOTS-c FAQ
What does MOTS-c stand for?
Mitochondrial open reading frame of the 12S rRNA type-c.
Is MOTS-c a hormone?
It’s often called a “mitokine” or mitochondrial hormone, because it’s released into circulation and acts on distant tissues, especially muscle.
What is Hero MOTS-c?
Hero Peptides’ research-grade MOTS-c, supplied as a lyophilized powder for laboratory research use only.
References
- Lee C, et al. The mitochondrial-derived peptide MOTS-c promotes metabolic homeostasis and reduces obesity and insulin resistance. Cell Metab. 2015;21(3):443-454.
- Kim KH, et al. The mitochondrial-encoded peptide MOTS-c translocates to the nucleus to regulate nuclear gene expression in response to metabolic stress. Cell Metab. 2018;28(3):516-524.
- Reynolds JC, et al. MOTS-c is an exercise-induced mitochondrial-encoded regulator of age-dependent physical decline and muscle homeostasis. Nat Commun. 2021;12(1):470.
For laboratory research use only. Not for human or veterinary use. This article summarizes published research and is not medical advice.