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Related Experiment Videos

Effective targeted gene 'knockdown' in zebrafish.

A Nasevicius1, S C Ekker

  • 1Arnold and Mabel Beckman Center for Transposon Research at the University of Minnesota, Department of Genetics, Cell Biology and Development, Minneapolis, Minnesota, USA.

Nature Genetics
|October 4, 2000
PubMed
Summary

Antisense morpholinos are effective tools for rapidly inhibiting gene function in zebrafish, enabling the study of gene roles and human diseases. This technique allows for precise gene knockdown across all cells, advancing reverse-genetic studies in vertebrates.

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Area of Science:

  • Developmental Biology
  • Genetics
  • Molecular Biology

Background:

  • The completion of the zebrafish genome sequence necessitates efficient methods for functional gene assignment.
  • Targeted gene knockdown technologies are crucial for understanding gene function in vertebrate models.
  • Existing RNA interference methods show limitations in broad cellular response in some model organisms.

Purpose of the Study:

  • To establish antisense morpholino oligonucleotides as an effective and specific translational inhibitor technology in zebrafish.
  • To demonstrate the utility of morpholinos for creating phenocopies of known mutations and modeling human diseases.
  • To validate morpholino efficacy across all zebrafish cells and developmental stages for reverse-genetic studies.

Main Methods:

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  • Administration of antisense, morpholino-modified oligonucleotides (morpholinos) to zebrafish embryos.
  • Generation of gene function 'knockdown' phenotypes mimicking specific mutations (no tail, chordin, etc.).
  • Inhibition of ubiquitous green fluorescent protein (GFP) transgene expression to assess morpholino distribution and efficacy.
  • Targeting specific genes (uroporphyrinogen decarboxylase, sonic hedgehog, tiggy-winkle hedgehog) to model human diseases.

    • Main Results:

    • Morpholinos effectively inhibited gene translation, producing phenocopies of known zebrafish mutations.
    • Unlike RNA interference, morpholinos demonstrated broad efficacy, inhibiting gene expression in all zebrafish cells.
    • Morpholino-induced phenotypes accurately modeled human diseases, including hepatoerythropoietic porphyria and holoprosencephaly.

    Conclusions:

    • Antisense morpholinos provide a rapid, specific, and broadly applicable gene knockdown tool for zebrafish research.
    • This technology facilitates in vivo reverse-genetic studies of conserved vertebrate developmental processes.
    • Morpholino-based models offer powerful systems for investigating the genetic basis of human diseases in a vertebrate context.