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Related Experiment Videos

Shapes in the shadow: evolutionary dynamics of morphogenesis.

P Hogeweg1

  • 1Theoretical Biology and Bioinformatics Group, Utrecht University, The Netherlands. ph@binf.bio.uu.nl

Artificial Life
|August 16, 2000
PubMed
Summary

This study reveals that complex biological forms (morphogenesis) evolve as a byproduct of increasing cell diversity. These intricate structures emerge unexpectedly, often as mutations from optimal solutions.

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Evolving mechanisms of morphogenesis: on the interplay between differential adhesion and cell differentiation.

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Area of Science:

  • Evolutionary biology
  • Developmental biology
  • Systems biology

Background:

  • Morphogenesis, the development of biological form, is crucial for organism complexity.
  • Understanding the evolutionary origins of morphogenesis is a key challenge.
  • Existing models often focus on direct selection for form, not indirect effects.

Purpose of the Study:

  • To investigate the evolutionary dynamics of morphogenesis as a side-effect of other evolutionary pressures.
  • To explore how complex morphologies arise from the interplay of basic biological processes.
  • To analyze the characteristics of evolutionary side-effects in biological systems.

Main Methods:

  • Simulated evolutionary dynamics incorporating differential cell adhesion, gene regulation, and intercellular signaling.
  • Analysis of genotype-phenotype mapping, focusing on nonlinear relationships.
  • Examination of evolutionary trajectories, including neutral paths and punctuated equilibria.

Main Results:

  • Morphogenesis emerged as a byproduct of maximizing cell type number, not direct selection for form.
  • Complex morphologies predominantly arose in the 'shadow' of neutral paths, as mutants from fittest individuals.
  • Evolutionary characteristics included unique morphologies, repeated emergence of similar forms, and mosaic-like morphological change with linear genotypic divergence.

Conclusions:

  • Morphogenesis can evolve as an emergent property and evolutionary side-effect.
  • Neutral evolution and nonlinear genotype-phenotype maps are critical for generating complex biological forms.
  • The study highlights the potential for complex structures to arise indirectly through evolutionary processes.

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