Human Gut Evolution: Insights from Stem Cell Models and Single-Cell Genomics.

The gastrointestinal (GI) tract evolved in response to dietary changes and pathogen exposures that varied throughout history. As a major interface between the host and environment, the GI epithelia have evolved specialized barrier and immune functions while optimizing nutrient processing and absorption. Recent technological breakthroughs in modeling human biology in vitro and comparative single-cell genomics are providing novel insights into the genetic, cellular, and ontogenic basis of human evolution. In this review, we provide a broad overview of human-specific gut changes and how GI organoids and single-cell technologies can offer a mechanistic understanding of the specific features of human GI tract physiology.