Researchers have assembled an atlas of more than 1,000 high-confidence microproteins — small proteins of 100–150 amino acids largely missing from standard reference proteomes — in the aged human brain. One microprotein encoded by the MKKS gene is depleted in Alzheimer's disease and governs energy production in microglia, linking a previously invisible layer of the proteome to immune metabolism in the aging brain.
Key Points
- Over 1,000 microproteins cataloged in aged human brain tissue
- MKKS-encoded microprotein reduced in Alzheimer's disease brains
- Microprotein regulates mitochondrial energy production within microglia
Longevity Analysis
Standard proteomic references have excluded an entire class of small coding sequences, meaning a portion of the molecular signaling that governs brain aging has been unreadable. Placing a microprotein at the intersection of microglial energy production and neurodegeneration ties the brain's resident immune cells to metabolic capacity — a relationship already implicated in how efficiently the brain clears debris and repairs itself. Expanding the catalog of measurable proteins sharpens the biomarkers available for detecting neurodegenerative decline before symptoms consolidate.
Original published by Nature Aging.