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0Researchers investigated the cellular and molecular mechanisms behind dietary adaptation in Tanganyikan cichlid fishes using comprehensive single-cell transcriptomic data. By analyzing 24 distinct species, the study revealed that rapid trophic specialization primarily targets anterior enterocytes, which are absorptive cells located in the front of the intestine. These evolutionary changes involve both the relative abundance of specific cell types and unique gene expression profiles that have shifted to accommodate different food sources. The findings indicate that these digestive adaptations are driven by fast-evolving genes that face fewer evolutionary constraints than those in other tissues. This work demonstrates that ecological diversification occurs across multiple biological layers, from gross physical traits like jaw shape to microscopic cellular compositions. Ultimately, the study highlights how flexible intestinal landscapes provided the necessary substrate for one of the most diverse vertebrate radiations on Earth.
References:
Fages A, Luxey M, Ronco F, et al. Adaptive cellular evolution in the intestine of hyperdiverse cichlid fishes[J]. Nature, 2026: 1-8.
