The expanding field of mitochondrial-derived peptides has introduced a set of small, regulatory molecules that challenge traditional views of intracellular communication. Among these, Humanin occupies a particularly intriguing position. Originally identified within the mitochondrial genome, this short peptide has attracted attention due to its proposed involvement in cellular stress responses, protein homeostasis, and signaling pathways that intersect with aging-related processes. Unlike conventional peptides encoded within nuclear DNA, Humanin emerges from a mitochondrial open reading frame, placing it at a unique interface between metabolic regulation and genomic signaling.
Humanin is composed of 24 amino acids in its canonical form, although slightly altered variants have been described depending on translational context. Its origin from mitochondrial DNA suggests that it may function as part of a retrograde signaling system, where mitochondria communicate functional states back to the nucleus and cytosol. This positioning has led to the hypothesis that Humanin might serve as
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