Deep proteogenomic profiling of human frontal cortex identified 1,067 previously unannotated microproteins, a subset of which shows altered expression in Alzheimer's disease independently of the canonical genes they are encoded within. One microprotein derived from the MKKS locus proved necessary for normal mitochondrial respiration in microglia, linking an overlooked layer of the proteome to immune cell energy metabolism in the aging brain.
Key Points
- 1,067 unannotated microproteins detected in human frontal cortex tissue
- Subset shifts in Alzheimer's independently of their canonical parent genes
- MKKS-derived microprotein required for normal microglial mitochondrial respiration
Longevity Analysis
Brain resilience depends on microglia maintaining sufficient energy output to clear debris and regulate inflammation, and this work locates a previously invisible layer of regulation over that capacity. Because these microproteins change independently of their parent genes, standard transcriptomic readouts would miss them entirely — a reminder that the signals used to interpret neurodegenerative risk are only as good as the molecular resolution behind them. For anyone tracking cognitive trajectory, the practical implication remains upstream: protecting mitochondrial function and limiting the inflammatory load that immune cells in the brain must absorb.
Original published by Nature Aging, by Brendan Miller.