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Three and Four-Dimensional Visualization and Analysis Approaches to Study Vertebrate Axial Elongation and Segmentation
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Multiple morphogens and rapid elongation promote segmental patterning during development.

Yuchi Qiu1, Lianna Fung2,3, Thomas F Schilling2,3

  • 1Department of Mathematics, University of California, Irvine, California, United States of America.

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|June 23, 2021
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Summary
This summary is machine-generated.

Zebrafish hindbrain segmentation relies on fibroblast growth factor (FGF) and retinoic acid (RA) signaling, alongside tissue dynamics, to form sharp, accurately sized rhombomeres. This study models how these factors synergize for precise segment development.

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Area of Science:

  • Developmental Biology
  • Computational Biology
  • Genetics

Background:

  • Vertebrate hindbrain segmentation into rhombomeres is crucial for development.
  • Rhombomere boundaries sharpen over time, influenced by gene regulation and cell sorting.
  • Mechanisms for simultaneous rhombomere formation and size accuracy remain unclear.

Purpose of the Study:

  • To investigate the mechanisms controlling zebrafish hindbrain rhombomere formation and boundary sharpening.
  • To model the synergistic roles of morphogens and tissue dynamics in segment development.

Main Methods:

  • Developed a stochastic multiscale cell-based model.
  • Incorporated dynamic morphogenetic changes (convergent-extension).
  • Integrated multiple morphogens (FGF, RA) and gene regulatory networks.

Main Results:

  • FGF and RA signaling specify and maintain accurately sized rhombomere boundaries.
  • Rapid NP narrowing enhances boundary sharpness and segment size.
  • Tissue dynamics and morphogens act synergistically to regulate segment formation.

Conclusions:

  • Simultaneous formation and accurate sizing of multiple rhombomeres are achieved through combined morphogen and tissue dynamics.
  • The model provides insights into the complex interplay regulating hindbrain segmentation.