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Related Experiment Videos

Large-scale enhancer detection in the zebrafish genome.

Staale Ellingsen1, Mary A Laplante, Melanie König

  • 1Sars International Centre for Marine Molecular Biology at the University of Bergen, Thormoehlensgate 55, 5008 Bergen, Norway.

Development (Cambridge, England)
|July 29, 2005
PubMed
Summary

Transgenic fish revealed distinct embryonic expression patterns by mapping retroviral insertion sites near developmental genes. This study identifies novel gene associations with ultra-conserved non-coding elements in vertebrates.

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Area of Science:

  • Developmental Biology
  • Genetics
  • Molecular Biology

Background:

  • Murine retroviral vectors are tools for generating transgenic organisms.
  • Enhancer detection cassettes facilitate the study of gene regulation.
  • Zebrafish serve as a model organism for studying embryonic development.

Purpose of the Study:

  • To generate transgenic zebrafish lines using enhancer detection.
  • To map retroviral insertion sites and identify associated genes.
  • To investigate the relationship between retroviral insertions and developmental genes.

Main Methods:

  • Generation of 95 transgenic zebrafish lines via retroviral vector insertion.
  • Mapping of 65 proviral insertion sites to the zebrafish genome.

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  • Analysis of proximity between insertion sites and known developmental genes.

    • Main Results:

    • Distinct reporter gene expression patterns observed during zebrafish embryonic development.
    • Many insertions mapped near transcription factor gene families (Pax, Hox, Sox, Pou, Otx, Emx, zinc-finger, bHLH).
    • Identified insertions near genes associated with ultra-conserved non-coding elements.

    Conclusions:

    • Retroviral insertion mapping is effective for identifying regulatory elements controlling gene expression.
    • Proximity analysis revealed potential regulatory interactions between proviruses and nearby developmental genes.
    • This work contributes to understanding gene regulation and vertebrate genome evolution.