Emergence of cellular nematic order is a conserved feature of gastrulation in animal embryos

Xin Li (), Robert J. Huebner (), Margot L. K. Williams, Jessica Sawyer, Mark Peifer, John B. Wallingford and D. Thirumalai
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Xin Li: University of Texas at Austin
Robert J. Huebner: University of Texas at Austin
Margot L. K. Williams: Baylor College of Medicine
Jessica Sawyer: Duke University
Mark Peifer: University of North Carolina at Chapel Hill
John B. Wallingford: University of Texas at Austin
D. Thirumalai: University of Texas at Austin

Nature Communications, 2025, vol. 16, issue 1, 1-18

Abstract: Abstract Cells undergo dramatic morphological changes during embryogenesis, yet how these changes affect the formation of ordered tissues remains elusive. Here, we show that a phase transition leading to the formation of a nematic liquid crystal state during gastrulation in the development of embryos of fish, frogs, and fruit flies occurs by a common mechanism despite substantial differences between these evolutionarily distant animals. Importantly, nematic order forms early before any discernible changes in the shapes of cells. All three species exhibit similar propagation of the nematic phase, reminiscent of nucleation and growth mechanisms. The spatial correlations in the nematic phase in the notochord region are long-ranged and follow a similar power-law decay ( $$y \sim {x}^{-\alpha }\,$$ y ~ x − α ) with α less than unity, indicating a common underlying physical mechanism. To explain the common physical mechanism, we created a theoretical model that not only explains the experimental observations but also predicts that the nematic phase should be disrupted upon loss of planar cell polarity (frog), cell adhesion (frog), and notochord boundary formation (zebrafish). Gene knockdown or mutational studies confirm the theoretical predictions. The combination of experiments and theory provides a unified framework for understanding the potentially universal features of metazoan embryogenesis, in the process shedding light on the advent of ordered structures during animal development.

Date: 2025
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DOI: 10.1038/s41467-025-61045-0

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