Hemizygous transgenic mice are viable, fertile, normal in size and do not display any gross physical or behavioral abnormalities. These transgenic mice express the mouse transducin-like enhancer of split 1, homolog of Drosophila E(spl) gene, Tle1 (also known as Groucho-related gene 1; Grg1) under the regulation of the chicken beta actin promoter (ACTB) and the cytomegalovirus (CMV) intermediate-early enhancer. An internal ribosome entry sequence (IRES) followed by the human alkaline phosphatase (ALPP) reporter gene inserted downstream of the Tle1 gene directs co-expression of ALPP and TLE1. TLE1 and ALPP co-expression is blocked, however, by the presence of a loxP-flanked Bgeo (beta-galactosidase/neomycin resistance fusion protein) cassette inserted between the ACTB/CMV promoter and the Tle1 coding sequence. In the absence of Cre recombinase, beta-galactosidase activity is detected in all tissues tested including pancreas, lung, kidney, cerebellum, heart, muscle and lens and retina. Diminished beta-galactosidase activity is observed in liver tissue. When transgenic mice are crossed with a Cre recombinase-expressing strain, lacZ expression in the resulting offspring is replaced by both ALPP and TLE1 protein in cre-expressing tissues. These mice may be useful in studying lung tumorigenesis.

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In these transgenic mice co-expression of Tle1 and the human alkaline phosphatase (ALPP) reporter gene is blocked by the presence of a loxP-flanked Bgeo cassette inserted between the ACTB/CMV promoter and the Tle1 coding sequence.

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STOCK Tg(CAG-Bgeo -Tle1 -ALPP)1Lbe/J Frozen Embryo