Mice that are homozygous for the targeted mutation are viable, fertile, normal in size and do not display any gross physical or behavioral abnormalities. In the absence of Cre, there is low level expression of Luciferase-SIY H2b antigen expression. After Cre activity, the recombined locus has high expression of Luciferase-SIY fusion protein. This mutant mouse strain may be useful in studies of immune response to a self-antigen or over-expressed tumor-associated antigen when used in combination with tumor-prone models. This mouse is also useful as a reporter for Cre activity.

A loxP-flanked puromycin resistance/STOP cassette followed by a fusion of firefly luciferase and synthetic antigen peptide SIYRYYGL were introduced to the Gt(ROSA)26Sor (gene trap ROSA 26, Philippe Soriano) locus. After Cre activity, the recombined locus has high expression of Luciferase-SIY fusion protein. This mutant mouse strain may be useful in studies of immune response to a self-antigen or over-expressed tumor-associated antigen when used in combination with tumor-prone models.

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