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Related Experiment Videos

Lifelong genetic minipumps.

Kathleen M I Caron1, Leighton R James, Gene Lee

  • 1Department of Cell and Molecular Physiology, University of North Carolina-CH,

Physiological Genomics
|December 9, 2004
PubMed
Summary

Researchers developed a genetic minipump system for lifelong reagent delivery in animals. This novel approach enables precise control over protein secretion, offering a powerful tool for physiological studies.

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Area of Science:

  • Physiology
  • Genetics
  • Molecular Biology

Background:

  • Osmotic minipumps are widely used for controlled reagent delivery in physiological research.
  • Current minipumps have limited duration and require surgical implantation.
  • A need exists for a long-term, genetically controlled method of reagent administration.

Purpose of the Study:

  • To develop a genetic equivalent of an osmotic minipump for lifelong, controlled protein secretion.
  • To create a tool for studying the physiological effects of sustained protein levels.
  • To demonstrate the feasibility of this system using renin secretion in mice.

Main Methods:

  • Combined genetic clamping, single-copy chosen-site integration, and untranslated region (UTR) modification.
  • Generated a renin transgene driven by an albumin promoter.

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  • Inserted the transgene as a single copy into the liver-specific ApoA1/ApoC3 locus.

    • Main Results:

    • Successfully created mice with "genetic minipumps" secreting renin ectopically from the liver.
    • Achieved investigator-controlled renin levels ranging from physiological to eightfold wild type.
    • Observed graded cardiovascular and kidney disease corresponding to renin levels.

    Conclusions:

    • The developed genetic minipump system provides lifelong, controlled protein secretion.
    • This technology allows for precise manipulation of physiological parameters in vivo.
    • The system is adaptable for controlling plasma levels of various secreted proteins.