Researchers have discovered that Drosophila intestinal stem cells utilize an internal epigenetic counter to regulate the balance of different daughter cell types. By tracking cell lineages, the study reveals that these stem cells precisely execute eight divisions to produce enterocytes before switching to create enteroendocrine cells on the ninth division. This counting mechanism is driven by the antagonistic balance of Trithorax and Polycomb group proteins, which manage active and repressive histone marks that shift with each mitosis. While tissue injury can speed up the rate of these divisions, it does not disrupt the fundamental mathematical logic of the count. Ultimately, this histone-based timer ensures developmental accuracy and consistent tissue proportions, offering potential insights into regenerative medicine and cellular disorders.
References:
Tong D, Li A, Jiang Q, et al. Intestinal stem cells count self-renewal divisions to switch multipotency[J]. Nature, 2026: 1-10.
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