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Probing the Roles of Physical Forces in Early Chick Embryonic Morphogenesis
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Dynamical patterning modules: physico-genetic determinants of morphological development and evolution.

Stuart A Newman1, Ramray Bhat

  • 1Department of Cell Biology and Anatomy, New York Medical College, Valhalla, NY 10595, USA. newman@nymc.edu

Physical Biology
|April 12, 2008
PubMed
Summary
This summary is machine-generated.

This study introduces dynamical patterning modules (DPMs), which link developmental genes to physical processes. DPMs explain how diverse animal body plans emerged through physical mechanisms, predating genetic changes.

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Area of Science:

  • Developmental Biology
  • Evolutionary Biology
  • Biophysics

Background:

  • Multicellular organism forms arise from cell state changes and rearrangements.
  • The 'developmental-genetic toolkit' mediates morphogenesis, but its link to physical processes is understudied.

Purpose of the Study:

  • Introduce 'dynamical patterning modules' (DPMs) as a framework linking genetic toolkit products to physical processes in morphogenesis.
  • Propose that DPMs explain the generation of metazoan body plans and organ forms.

Main Methods:

  • Conceptual framework development based on existing knowledge of gene products and physical systems.
  • Analysis of how toolkit gene products mobilize physical processes like cohesion, viscoelasticity, and diffusion.
  • Modeling DPMs as a 'pattern language' for generating diverse biological forms.

Main Results:

  • DPMs, composed of toolkit gene products, mobilize physical processes in cell aggregates.
  • DPMs act as a 'pattern language' capable of generating all metazoan body plans and organ forms.
  • Physical processes, driven by DPMs, allowed exploration of morphospace without immediate genotypic change.

Conclusions:

  • Ancient gene products acquired novel morphogenetic functions in multicellular contexts via DPMs.
  • Phenotypic diversity in early animal evolution may have preceded genetic changes, challenging Neo-Darwinian principles.
  • DPMs offer a unified explanation for developmental patterns and the molecular homology-analogy paradox.