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Updated: Oct 23, 2025

Dissection and Lateral Mounting of Zebrafish Embryos: Analysis of Spinal Cord Development
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Evolution of lbx spinal cord expression and function.

José Luis Juárez-Morales1, Frida Weierud2, Samantha J England1

  • 1Department of Biology, Syracuse University, Syracuse, New York, USA.

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|August 19, 2021
PubMed
Summary

Ladybird homeobox (Lbx) genes are vital for nervous system development. Zebrafish lbx1a and lbx1b play distinct roles in spinal interneuron development, with lbx1a

Keywords:
dI4dI5dI6sharksmall-spotted catshark

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Area of Science:

  • Developmental Biology
  • Neuroscience
  • Genetics

Background:

  • Ladybird homeobox (Lbx) transcription factors are essential for muscle and nervous system development across diverse animal species.
  • Amniotes possess two Lbx genes, with Lbx1 being the sole member expressed in the spinal cord.
  • Teleosts exhibit three lbx genes, prompting an investigation into their specific roles and evolutionary origins.

Purpose of the Study:

  • To investigate the expression patterns and functional roles of zebrafish lbx1a, lbx1b, and lbx2 in spinal cord development.
  • To determine the evolutionary conservation and divergence of Lbx gene functions, particularly in spinal interneuron specification.
  • To elucidate the sequential roles of lbx1a and lbx1b in the development of specific spinal interneuron subtypes.

Main Methods:

  • Comparative gene expression analysis of lbx genes across different species (zebrafish, Scyliorhinus canicula, Xenopus tropicalis, mouse).
  • Zebrafish mutant generation (lbx1a, lbx1b, and lbx1a;lbx1b double mutants) to assess functional consequences.
  • Quantification of excitatory and inhibitory spinal interneuron populations in wild-type and mutant zebrafish.

Main Results:

  • Zebrafish lbx1a, lbx1b, and lbx2 are expressed in distinct spinal cell types, with lbx1a showing conserved expression in dI4-dI6 interneurons.
  • Zebrafish lbx1a function in spinal interneuron development is conserved with mouse Lbx1, regulating inhibitory and excitatory interneuron numbers.
  • lbx1b mutants exhibit reduced inhibitory interneurons, and lbx1a;lbx1b double mutants show phenotypes similar to lbx1a single mutants, suggesting sequential roles.

Conclusions:

  • Zebrafish lbx1a expression in spinal interneurons is likely an ancestral trait, while lbx1b's spinal progenitor cell expression is a derived function.
  • lbx2 spinal expression appears to be specific to the ray-finned lineage.
  • Lbx1b and Lbx1a may act sequentially in the specification of dI4 and dI6 spinal interneurons, with Lbx1a being crucial for suppressing excitatory fates.