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Generating amphioxus Hedgehog knockout mutants and phenotype analysis.

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Researchers created a genetically modified amphioxus model by altering the Hedgehog gene. This modification resulted in developmental abnormalities and a loss of left-right asymmetry in homozygous mutants, highlighting the gene

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Area of Science:

  • Evolutionary Developmental Biology
  • Genetics
  • Animal Models

Background:

  • Amphioxus serves as a crucial model organism for evolutionary and developmental studies due to its phylogenetic position.
  • The Hedgehog (Hh) signaling pathway plays a fundamental role in embryonic development across diverse animal species.

Purpose of the Study:

  • To generate a genetically modified amphioxus strain with targeted mutations in the Hedgehog (Hh) gene locus.
  • To investigate the developmental consequences of Hh gene disruption in amphioxus embryos.
  • To assess the role of Hh signaling in establishing embryonic left-right asymmetry.

Main Methods:

  • Utilized the TALEN (Transcription Activator-Like Effector Nucleases) gene-editing system to introduce mutations into the Hh gene of amphioxus.
  • Generated and screened F(0) and F(1) generations for mutations in the Hh coding region and gametic transmission.
  • Phenotypically analyzed F(2) embryos derived from heterozygous Hh mutant crosses to identify developmental defects.

Main Results:

  • Achieved a 34% mutation rate in the Hh coding region of F(0) amphioxus following TALEN injection, with mutations confirmed in gametes.
  • Homozygous Hh mutant F(2) embryos exhibited severe developmental abnormalities, including ventral head and tail curvature, agenesis of mesoblastic tissue, and lack of mouth formation.
  • Homozygous Hh mutants displayed a loss of normal left-right asymmetry, presenting with ventrally located gill slits, indicating a conserved function of Hh signaling in axis determination.

Conclusions:

  • Successfully generated a genetically modified amphioxus line with targeted Hh gene mutations using TALEN technology.
  • Disruption of the Hh gene leads to significant embryonic developmental defects and lethality in amphioxus.
  • Hedgehog signaling is essential for establishing left-right embryonic axis patterning in amphioxus, consistent with its conserved role in other vertebrates.