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Probing the Roles of Physical Forces in Early Chick Embryonic Morphogenesis
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A potential role for differential contractility in early brain development and evolution.

Benjamen A Filas1, Alina Oltean, David C Beebe

  • 1Department of Biomedical Engineering, Washington University, One Brookings Drive, Campus Box 1097, Saint Louis, MO 63130-4899, USA.

Biomechanics and Modeling in Mechanobiology
|April 3, 2012
PubMed
Summary

Changes in embryonic brain tissue contractility can explain species-specific brain shapes. This study reveals how cytoskeletal contraction patterns influence early brain development and morphology across different species.

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Area of Science:

  • Evolutionary developmental biology (evo-devo)
  • Comparative neuroanatomy
  • Morphogenesis

Background:

  • Species-specific brain structure differences are a key area in evolutionary biology.
  • Understanding embryonic development is crucial for explaining these morphological variations.
  • Evolutionary developmental biology suggests gene expression changes drive morphological differences, but cellular mechanisms are less explored.

Purpose of the Study:

  • To investigate the role of spatiotemporal tissue contractility in generating early embryonic brain morphology differences.
  • To explore the morphomechanical mechanisms underlying neural phenotypic variation between species.

Main Methods:

  • Experimentally enhanced cytoskeletal contraction in embryonic chick brains using calyculin A.
  • Analyzed changes in neuroepithelium protein distribution and brain cross-section shapes.
  • Utilized finite element modeling to simulate the effects of localized tissue contraction on brain tube geometry.
  • Developed a model to explore the influence of initial brain tube geometry on contractility.

Main Results:

  • Enhanced contractility in chick embryos altered brain cross-sections from round to triangular, diamond, and slit shapes.
  • These induced shapes mimicked morphologies observed in zebrafish and Xenopus brains.
  • F-actin concentrated at vertices of hyper-contracted regions, driving shape changes.
  • Models indicated that initial brain tube geometry influences the necessity of localized contraction for lumen formation.

Conclusions:

  • Spatiotemporal patterns of tissue contractility are sufficient to explain early embryonic brain morphology differences between species.
  • Cytoskeletal contraction plays a significant, previously underestimated role in generating interspecies brain morphology variations at early developmental stages.
  • This research provides insights into the morphomechanical basis of neural phenotypic diversity.