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Molecular and Cellular Biology, September 2004, p. 7636-7642, Vol. 24, No. 17
0270-7306/04/$08.00+0     DOI: 10.1128/MCB.24.17.7636-7642.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Cell Depletion Due to Diphtheria Toxin Fragment A after Cre-Mediated Recombination

Damian Brockschnieder,1 Corinna Lappe-Siefke,1,2 Sandra Goebbels,2 Michael R. Boesl,1,3 Klaus-Armin Nave,2 and Dieter Riethmacher1*

Zentrum für Molekulare Neurobiologie, Universität Hamburg, Hamburg,1 Max Planck Institute for Experimental Medicine, Göttingen,2 Max Planck Institute of Neurobiology, Martinsried, Germany3

Received 19 February 2004/ Returned for modification 19 April 2004/ Accepted 27 May 2004

Abnormal cell loss is the common cause of a large number of developmental and degenerative diseases. To model such diseases in transgenic animals, we have developed a line of mice that allows the efficient depletion of virtually any cell type in vivo following somatic Cre-mediated gene recombination. By introducing the diphtheria toxin fragment A (DT-A) gene as a conditional expression construct (floxed lacZ-DT-A) into the ubiquitously expressed ROSA26 locus, we produced a line of mice that would permit cell-specific activation of the toxin gene. Following Cre-mediated recombination under the control of cell-type-specific promoters, lacZ gene expression was efficiently replaced by de novo transcription of the Cre-recombined DT-A gene. We provide proof of this principle, initially for cells of the central nervous system (pyramidal neurons and oligodendrocytes), the immune system (B cells), and liver tissue (hepatocytes), that the conditional expression of DT-A is functional in vivo, resulting in the generation of novel degenerative disease models.

* Corresponding author. Mailing address: Zentrum für Molekulare Neurobiologie, Falkenried 94, 20251 Hamburg, Germany. Phone: 49 40 428035354. Fax: 49 40 428035359. E-mail: drieth{at}zmnh.uni-hamburg.de.

Molecular and Cellular Biology, September 2004, p. 7636-7642, Vol. 24, No. 17
0022-538X/04/$08.00+0     DOI: 10.1128/MCB.24.17.7636-7642.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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