Recombinase-based conditional and reversible gene regulation via XTR alleles

Camila Robles-Oteiza, Sarah Taylor, Travis Yates, Michelle Cicchini, Brian Lauderback, Christopher R. Cashman, Aurora A. Burds, Monte M. Winslow, Tyler Jacks and David M. Feldser ()
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Camila Robles-Oteiza: Abramson Family Cancer Research Institute and Perelman School of Medicine at the University of Pennsylvania
Sarah Taylor: Koch Institute for Integrative Cancer Research at the Massachusetts Institute of Technology
Travis Yates: Abramson Family Cancer Research Institute and Perelman School of Medicine at the University of Pennsylvania
Michelle Cicchini: Abramson Family Cancer Research Institute and Perelman School of Medicine at the University of Pennsylvania
Brian Lauderback: Abramson Family Cancer Research Institute and Perelman School of Medicine at the University of Pennsylvania
Christopher R. Cashman: Koch Institute for Integrative Cancer Research at the Massachusetts Institute of Technology
Aurora A. Burds: Koch Institute for Integrative Cancer Research at the Massachusetts Institute of Technology
Monte M. Winslow: Stanford University School of Medicine
Tyler Jacks: Koch Institute for Integrative Cancer Research at the Massachusetts Institute of Technology
David M. Feldser: Abramson Family Cancer Research Institute and Perelman School of Medicine at the University of Pennsylvania

Nature Communications, 2015, vol. 6, issue 1, 1-9

Abstract: Abstract Synthetic biological tools that enable precise regulation of gene function within in vivo systems have enormous potential to discern gene function in diverse physiological settings. Here we report the development and characterization of a synthetic gene switch that, when targeted in the mouse germline, enables conditional inactivation, reports gene expression and allows inducible restoration of the targeted gene. Gene inactivation and reporter expression is achieved through Cre-mediated stable inversion of an integrated gene-trap reporter, whereas inducible gene restoration is afforded by Flp-dependent deletion of the inverted gene trap. We validate our approach by targeting the p53 and Rb genes and establishing cell line and in vivo cancer model systems, to study the impact of p53 or Rb inactivation and restoration. We term this allele system XTR, to denote each of the allelic states and the associated expression patterns of the targeted gene: eXpressed (XTR), Trapped (TR) and Restored (R).

Date: 2015
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DOI: 10.1038/ncomms9783

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