Physiol. Genomics AJP: Endocrinology and Metabolism
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Physiol. Genomics 37: 140-146, 2009. First published January 13, 2009; doi:10.1152/physiolgenomics.90328.2008
1094-8341/09 $8.00
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Received 16 September 2008; accepted in final form 5 January 2009.
Physiological Genomics 37:140-146 (2009)
1094-8341/09 $8.00 © 2009 American Physiological Society

Innovative Methodology

Targeted transgenesis at the HPRT locus: an efficient strategy to achieve tightly controlled in vivo conditional expression with the tet system

G. Palais 1,2,3, A. Nguyen Dinh Cat 1,2,3, H. Friedman 4, N. Panek-Huet 1,2,3, A. Millet 2,5, F. Tronche 2,5, B. Gellen 6,7, J.-J. Mercadier 6,7, A. Peterson 4 and F. Jaisser 1,2,3

1 Institut National de la Santé et de la Recherche Médicale (INSERM), U772
2 Collège de France
3 l'Université Paris Descartes, Paris, France
4 Laboratory of Developmental Biology, H-5, Royal Victoria Hospital, McGill University Health Centre, Montreal, Quebec, Canada
5 Centre National de la Recherche Scientifique Unité Mixte de Recherche 7148
6 INSERM, U698
7 l'Université Paris 7, Paris, France

ABSTRACT

The tet-inducible system has been widely used to achieve conditional gene expression in genetically modified mice. To alleviate the frequent difficulties associated with recovery of relevant transgenic founders, we tested whether a controlled strategy of transgenesis would support reliable cell-specific, doxycycline (Dox)-controlled transgene expression in vivo. Taking advantage of the potent hypoxanthine-aminopterin-thymidine selection strategy and an embryonic stem (ES) cell line supporting efficient germ-line transmission, we used hypoxanthine phosphoribosyltransferase (HPRT) targeting to insert a single copy tet-inducible construct designed to allow both glucocorticoid receptor (GR) and β-galactosidase (β-Gal) expression. Conditional, Dox-dependent GR and β-Gal expression was evidenced in targeted ES cells. Breeding ES-derived single copy transgenic mice with mice bearing appropriate tet transactivators resulted in β-Gal expression both qualitatively and quantitatively similar to that observed in mice with random integration of the same construct. Interestingly, GR expression in mice was dependent on transgene orientation in the HPRT locus while embryonic stem cell expression was not. Thus, a conditional construct inserted in single copy and in predetermined orientation at the HPRT locus demonstrated a Dox-dependent gene expression phenotype in adult mice suggesting that controlled insertion of tet-inducible constructs at the HPRT locus can provide an efficient alternative strategy to reproducibly generate animal models with tetracycline-induced transgene expression.

hypoxanthine phosphoribosyltransferase; tetracycline; mouse






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