RT Journal Article SR Electronic T1 Transnuclear Mice with Predefined T Cell Receptor Specificities Against Toxoplasma gondii Obtained via SCNT JF Science JO Science FD American Association for the Advancement of Science SP 243 OP 248 DO 10.1126/science.1178590 VO 328 IS 5975 A1 Kirak, Oktay A1 Frickel, Eva-Maria A1 Grotenbreg, Gijsbert M. A1 Suh, Heikyung A1 Jaenisch, Rudolf A1 Ploegh, Hidde L. YR 2010 UL http://science.sciencemag.org/content/328/5975/243.abstract AB Mice that are transgenic for rearranged antigen-specific T cell receptors (TCRs) are essential tools to study T cell development and function. Such TCRs are usually isolated from the relevant T cells after long-term culture, often after repeated antigen stimulation, which unavoidably skews the T cell population used. Random genomic integration of the TCR α and β chain and expression from nonendogenous promoters represent additional drawbacks of transgenics. Using epigenetic reprogramming via somatic cell nuclear transfer, we demonstrated that T cells with predefined specificities against Toxoplasma gondii can be used to generate mouse models that express the TCR from their endogenous loci, without experimentally introduced genetic modification. The relative ease and speed with which such transnuclear models can be obtained holds promise for the construction of other disease models.