Recombinase-based conditional and reversible gene regulation via XTR alleles

Area of Science:

• Synthetic biology
• Gene regulation
• Mammalian genetics

Background:

• Precise control of gene function in vivo is crucial for understanding biological processes.
• Existing tools for gene manipulation often lack the ability to both inactivate and restore gene function conditionally.

Purpose of the Study:

• To develop and characterize a novel synthetic gene switch for conditional gene regulation in the mouse germline.
• To enable precise control over gene inactivation, expression reporting, and inducible gene restoration.
• To validate the system's utility in studying gene function in cancer models.

Main Methods:

• Development of a synthetic gene switch (XTR system) utilizing Cre-mediated inversion and Flp-dependent deletion.
• Targeting of key genes (p53, Rb) in mouse germline and establishment of cell line and in vivo cancer models.
• Characterization of allelic states: eXpressed (XTR), Trapped (TR), and Restored (R).

Main Results:

• Successful development and characterization of the XTR gene switch system.
• Demonstrated conditional gene inactivation, reporter expression, and inducible gene restoration in mouse models.
• Validated the system's application in studying the impact of p53 or Rb inactivation and restoration in cancer.

Conclusions:

• The XTR system provides a powerful synthetic biological tool for precise, conditional gene manipulation in vivo.
• This system facilitates the study of gene function, particularly in the context of gene inactivation and restoration dynamics.
• The XTR system offers a versatile platform for creating complex genetic models for disease research.