Overview
- The study, published September 14, 2026, used 480 postmortem human frontal cortex samples to build a microprotein atlas that reports 1,067 previously uncharacterized microproteins.
- Researchers combined deep mass spectrometry, existing transcriptomes and an AI tool called ShortStop to detect small open reading frame–encoded peptides that standard protein catalogs miss.
- Hundreds of the newly found microproteins show different expression in Alzheimer’s disease samples, with affected cells tending to express more microproteins overall.
- A 63–amino‑acid microprotein at the MKKS locus appeared to be the dominant product at that site, was downregulated in Alzheimer’s samples, and its knockout in microglia impaired mitochondrial respiration.
- The team released the atlas and a downloadable database as a community resource but cautioned that spectral detection shows these peptides exist while further experiments are needed to prove which microproteins are bioactive rather than passive markers of transcriptional change.