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Related Experiment Videos

Reversible gene inactivation in the mouse.

Moisés Mallo1, Benoît Kanzler, Sabine Ohnemus

  • 1Department of Developmental Biology, Max-Planck Institute of Immunobiology, Freiburg, Germany. mallo@igc.gulbenkian.pt

Genomics
|April 5, 2003
PubMed
Summary

Researchers developed a reversible gene inactivation method for Hoxa2 in mice using tetracycline-controlled elements. This technique allows for precise spatial and temporal control, overcoming limitations of irreversible gene knockout models.

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Area of Science:

  • Developmental Biology
  • Genetics
  • Molecular Biology

Background:

  • Gene-inactivation techniques are crucial in mouse models for biomedical research.
  • Current methods offer ubiquitous, tissue-specific, and temporal control but are irreversible.
  • Irreversibility limits the study of essential genes and dynamic biological processes.

Purpose of the Study:

  • To develop a method for complete and reversible gene inactivation in mice.
  • To achieve spatial and temporal control over gene inactivation using the tetracycline-resistance operon.
  • To investigate the role of Hoxa2 through reversible inactivation.

Main Methods:

  • Generated a Hoxa2 allele containing tetracycline operator (tetO) sequences.
  • Utilized a tetracycline-controlled transcriptional activator/repressor system (tTS) for gene regulation.

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  • Administered doxycycline to pregnant females to control gene inactivation reversibility.

    • Main Results:

    • Achieved complete and reversible inactivation of the Hoxa2 gene in mice.
    • Demonstrated specific regulation of the tetO-modified Hoxa2 allele by tTS.
    • Confirmed that the inactivation was reversible upon doxycycline administration without affecting neighboring genes.

    Conclusions:

    • Developed a novel, reversible gene inactivation system in mice.
    • This tetracycline-inducible system allows for precise spatial and temporal control of gene function.
    • The method overcomes the limitations of irreversible gene knockouts, enabling new research avenues.