Hemizygous transgenic mice are viable, fertile, normal in size and do not display any gross physical or behavioral abnormalities. These transgenic mice express Cre recombinase under the control of a tetracycline-responsive promoter element (TRE; tetO). When hemizygotes are bred with another transgenic mouse expressing either reverse tetracycline-controlled transactivator protein (rtTA) or tetracycline-controlled transactivator protein (tTA) under the control of tissue-specific promoters, Cre recombinase expression and Cre-mediated recombination in the appropriate tissues of the bitransgenic offspring can be regulated with the tetracycline analog, doxycycline. This strain represents an effective tool for generating inducible tissue specific-targeted mutants to study cell lineage during development. In an attempt to offer alleles on well-characterized or multiple genetic backgrounds, alleles are frequently moved to a genetic background different from that on which an allele was first characterized. This is the case for the strain above. It should be noted that the phenotype could vary from that originally described. We will modify the strain description if necessary as published results become available. &nbsp;

These transgenic mice express Cre recombinase under the control of a tetracycline-responsive promoter element (TRE or tetO) and are an effective tool for generating inducible, tissue-specific, targeted mutants to study cell lineage during development.  When bred with another transgenic mouse expressing reverse tetracycline-controlled transactivator protein (rtTA) or tetracycline-controlled transactivator protein (tTA), Cre mediated recombination in the resulting bitransgenic offspring can be regulated with the tetracycline analog, doxycycline.

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