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Related Experiment Videos

Conditional transgene expression in endothelial cells.

R Sarao1, D J Dumont

  • 1Amgen Institute, University of Toronto, Ontario, Canada.

Transgenic Research
|May 26, 1999
PubMed
Summary
This summary is machine-generated.

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Researchers developed a novel tetracycline-controlled system for precise, reversible gene expression specifically in mouse endothelial cells. This tool enables studying gene function during development and in response to stimuli.

Area of Science:

  • Molecular Biology
  • Developmental Biology
  • Genetics

Background:

  • Controlling transgene expression in vivo is crucial for understanding gene function during development and in response to stimuli.
  • Existing methods may lack specificity or precise temporal control.
  • Endothelial cells play vital roles in development and disease.

Purpose of the Study:

  • To characterize and evaluate a tetracycline-responsive, endothelial-specific binary system for controlled gene expression in mice.
  • To establish a tool for investigating gene product roles in the endothelium during development.
  • To enable the study of potentially toxic gene products or rescue of embryonic mutations affecting endothelial cells.

Main Methods:

  • Engineering of transgenic mouse lines expressing a tetracycline-controlled transactivator (tTA) under endothelial-specific promoters (Tek, Tie) as driver lines.

Related Experiment Videos

  • Generation of a responder line containing multiple copies of the tTA DNA binding element (tetOS) upstream of a nuclear-targeted beta-galactosidase reporter gene.
  • Mating of driver and responder lines, followed by administration and withdrawal of doxycycline to assess gene expression control.

    • Main Results:

    • No reporter gene expression was observed in homozygous reporter mice.
    • Upon mating driver and responder lines, beta-galactosidase expression was detected specifically within the endothelium.
    • Reporter transgene expression was rapidly and reversibly repressed by doxycycline administration and withdrawal.

    Conclusions:

    • The developed tetracycline-responsive, endothelial-specific binary system provides tight and reversible control over transgene expression in vivo.
    • This system is a valuable tool for studying endothelial cell biology, development, and the roles of specific gene products.
    • It offers potential applications for delivering toxic gene products or rescuing mutations affecting the endothelial lineage or growth factor production.