MOTS-c

MOTS-c is unusual — it's encoded inside mitochondrial DNA, not the nucleus. Scientists discovered it relatively recently, hidden inside a stretch of mitochondrial RNA. It's part of a small family of "mitochondrial-derived peptides," and research has built up around it as a tool for studying metabolism and how mitochondria talk to the rest of the cell.

How it's been studied: Research from the Cohen and Lee labs has examined how MOTS-c switches on AMPK (a master metabolic enzyme), how it influences glucose uptake in muscle-cell lines, and how it acts as a signal from mitochondria back to the cell nucleus.

Where you'll see it in research:

• AMPK-activation assays in muscle-cell cultures (C2C12 myotubes)
• Cell-culture studies of insulin sensitivity and glucose uptake
• Animal-model research on metabolic regulation and exercise mimetics
• Studies of mitochondrial-derived peptide biology more broadly

Handling notes: Standard peptide handling. The peptide is amphipathic (it has both water-loving and oil-loving regions) so make sure it fully dissolves on reconstitution.