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Updated: Oct 21, 2025

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A topological look into the evolution of developmental programs.

Somya Mani1, Tsvi Tlusty2

  • 1Center for Soft and Living Matter, Institute for Basic Science, Ulsan, Republic of Korea.

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|September 4, 2021
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Summary
This summary is machine-generated.

Evolution of multicellular organisms involves complex developmental programs. Cell type lineage maps reveal that developmental trajectories are rarely tree-like, often forming directed acyclic graphs, and correlate with organism regeneration ability.

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Area of Science:

  • Evolutionary developmental biology
  • Systems biology
  • Computational biology

Background:

  • Understanding the evolution of multicellular organism complexity requires insights into developmental program evolution.
  • Describing the intricate spatiotemporal processes of development is challenging.
  • Cell type lineage maps offer an overview of developmental trajectories.

Purpose of the Study:

  • To propose that cell type lineage map geometry reveals modes of developmental program evolution.
  • To investigate the topological features of developmental programs and their relationship to organismal complexity and function.

Main Methods:

  • Development of a parsimonious generative model for developmental programs.
  • Surveying the universe of possible developmental programs.
  • Analysis of the topological features of generated lineage maps.

Main Results:

  • Lineage maps of complex multicellular organisms are typically directed acyclic graphs, not trees.
  • Multiple developmental routes can converge on the same cell type.
  • Lineage map topologies correlate with an organism's regenerative capacity.

Conclusions:

  • Developmental program evolution is reflected in cell type lineage map geometry.
  • Directed acyclic graph structures are common in complex organism development.
  • Lineage map topology is linked to organismal function, specifically regeneration.