AI Insight
Researchers have discovered that adult intestinal stem cells in Drosophila (fruit flies) use an epigenetic counting mechanism to track their own cell divisions and determine which type of daughter cell to produce. These stem cells consistently switch their fate every ninth division, alternating from producing enterocytes (absorptive cells) to producing enteroendocrine mother cells (which generate hormone-secreting cells). This division-counting system represents a novel mechanism for regulating stem cell multipotency and maintaining proper cellular diversity in the intestinal lining.
Why it matters
This finding reveals a fundamental principle of how stem cells maintain tissue diversity through precise division tracking rather than random fate determination. Understanding this counting mechanism could inform strategies for controlling stem cell behavior in regenerative medicine and provide insights into how disruptions in this process might contribute to intestinal diseases or aging.
Understand the Science
Nature, Published online: 29 July 2026; doi:10.1038/s41586-026-10814-y
In Drosophila, cell fate switching in adult intestinal stem cells is determined through an epigenetic mechanism in which these cells count divisions, switching from producing enterocytes to producing an enteroendocrine mother cell every ninth division.
Source: Intestinal stem cells count self-renewal divisions to switch multipotency