Researchers discovered that asymmetric cell division in mouse intestinal stem cells (ISCs) generates a small subset — about 9% of ISCs — enriched for chronologically old mitochondria (ISCmito-O). These cells produce elevated α-ketoglutarate (αKG), which drives TET-mediated epigenetic reprogramming to promote Paneth cell (PC) formation, the critical niche cells that support ISC survival. ISCmito-O can regenerate organoids independently of niche support, a key advantage tied to their superior ability to recreate PCs. Supplementing aged mice with αKG accelerated PC turnover and improved recovery from chemotherapy-induced gut damage. The findings reveal that organelle age heterogeneity is a previously unrecognized axis of stem cell regulation with therapeutic implications.
