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Related Experiment Video

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Analysis of Cell Differentiation, Morphogenesis, and Patterning During Chicken Embryogenesis Using the Soaked-Bead Assay
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Shared and differential features of Robo3 expression pattern in amniotes.

François Friocourt1, Peter Kozulin2, Morgane Belle1

  • 1Sorbonne Université, INSERM, CNRS, Institut de la Vision, Paris, France.

The Journal of Comparative Neurology
|January 31, 2019
PubMed
Summary

Robo3 receptor expression in commissural neurons is conserved across diverse amniotes, guiding axon midline crossing. Subtle modifications in Robo3 patterns may explain species-specific sensory-motor and cognitive evolution.

Keywords:
RRID:AB_1078266RRID:AB_2107107RRID:AB_2107124RRID:AB_2181865RRID:AB_2307443RRID:AB_2313773RRID:AB_2315065RRID:AB_2340880RRID:AB_2340885RRID:AB_2492288RRID:AB_262133RRID:AB_2651135RRID:AB_2732861RRID:AB_881306RRID:SCR_007370Robo3amniotescommissuresdevelopmentevolutionhabenulainferior olivepontine nucleus

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Evolutionary Biology

Background:

  • Commissural neurons project axons across the nervous system midline.
  • In mammals, the Robo3 receptor is essential for midline crossing of these axons.
  • Robo3's role and distribution in non-mammalian vertebrates remain largely uncharacterized.

Purpose of the Study:

  • To investigate the expression pattern of the Robo3 receptor in embryonic amniotes.
  • To compare Robo3 distribution across diverse vertebrate species, including reptiles, birds, and mammals.
  • To understand the evolutionary conservation and diversification of Robo3 function in nervous system development.

Main Methods:

  • Whole-mount immunostaining of embryonic tissues.
  • Advanced tissue clearing techniques.
  • Light-sheet fluorescent microscopy for high-resolution imaging.

Main Results:

  • Conserved Robo3 expression patterns were identified in the midbrain, hindbrain, and spinal cord commissural circuits across various amniotes.
  • Subtle variations in Robo3 expression were observed, potentially correlating with species-specific neural circuit evolution.
  • Significant differences in precerebellar nuclei development were noted among the studied amniote groups.

Conclusions:

  • Robo3 plays a conserved role in guiding commissural axon navigation across the midline in amniotes.
  • Evolutionary modifications in Robo3 expression likely contributed to the divergence of sensory-motor and cognitive abilities.
  • Comparative analysis reveals key differences in vertebrate brain development, particularly in precerebellar nuclei.