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Developmental hourglass: Verification by numerical evolution and elucidation by dynamical-systems theory.

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Evolutionary simulations reveal the emergence of developmental hourglasses, a key biological law. This finding explains why these patterns appear in certain species, linking development and evolution.

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Area of Science:

  • Evolutionary developmental biology
  • Systems biology
  • Genetics

Background:

  • Understanding the general laws governing evolution and development is a core biological challenge.
  • Developmental hourglasses are proposed as potential universal laws, but their necessity is not well-established.

Purpose of the Study:

  • To investigate the emergence and establishment of developmental hourglasses using evolutionary simulations.
  • To explore the relationship between gene networks, morphogenesis, and the evolution of cell types.

Main Methods:

  • Evolutionary simulations of gene networks controlling morphogenesis in multicellular organisms.
  • Selection pressure applied to increase the number of cell types.
  • Analysis of gene expression patterns and spatial correlations between species evolved from a common ancestor.

Main Results:

  • A developmental hourglass pattern was observed, characterized by a correlation peak in intermediate developmental stages.
  • Increased fraction of pleiotropic genes and decreased individual variance were noted, aligning with experimental data.
  • Developmental noise reduction occurred until the hourglass bottleneck, followed by diversification controlled by conserved gene expression dynamics.

Conclusions:

  • The study confirms the emergence of developmental hourglasses through evolutionary simulations.
  • The findings suggest that developmental hourglasses are established via conserved gene expression dynamics and noise reduction mechanisms.
  • This provides a potential explanation for the prevalence of developmental hourglasses within specific phylogenetic groups.