MOTS-c is a 16-amino acid peptide that is notably encoded by the mitochondrial genome rather than nuclear DNA, specifically originating from the 12S ribosomal RNA gene. This places it in a specialized class of signaling molecules known as mitochondrial-derived peptides (MDPs). These peptides act as retrograde signaling conduits, communicating metabolic stress and energy status from the mitochondria to the nucleus to regulate cellular homeostasis.

Current laboratory applications heavily focus on its role in metabolic regulation and its often-described “exercise-mimetic” properties. In-vitro and animal models utilize MOTS-c to observe its direct interaction with skeletal muscle tissue, where it actively promotes fatty acid oxidation and enhances glucose uptake. Researchers primarily study its mechanism of upregulating the AMPK (AMP-activated protein kinase) pathway to investigate its broader effects on insulin sensitivity, age-related metabolic decline, and cellular resistance to metabolic stress.