title: Development of a single-cassette system for spatiotemporal gene regulation in mice.
abstract: The tetracycline-regulated gene expression system has been widely used in mice to turn a transgene on and off in a target organ, but with only limited success. We developed an advanced system in which a Tet-off regulation unit was integrated into the ROSA26 locus and became active after Cre-mediated excision of the neo(r) gene. We examined the utility of this system through regulable expression of the homeodomain transcription factor pdx-1 and enhanced green fluorescent protein. The resulting mice showed strict tetracycline-regulable gene expression in all the organs where the neo(r) gene had been removed. When combined with organ-specific Cre recombinase transgenic mice, our system allows us to manipulate the gene expression in an organ-specific and temporal manner. This Tet-off system should serve as an efficient tool to analyze the roles of genes in complex biological systems, such as embryogenesis, metabolism, immune system, etc.
authors.affiliation: Division of Stem Cell Regulation Research, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan.
authors.forename: Satsuki
authors.initials: S
authors.lastname: Miyazaki
authors.forename: Tatsushi
authors.initials: T
authors.lastname: Miyazaki
authors.forename: Fumi
authors.initials: F
authors.lastname: Tashiro
authors.forename: Eiji
authors.initials: E
authors.lastname: Yamato
authors.forename: Jun-ichi
authors.initials: J
authors.lastname: Miyazaki
mesh_terms: D000818:Animals; D005786:Gene Expression Regulation / Q000187:drug effects / Q000502:physiology*; D020868:Gene Silencing; D005818:Genetic Engineering / Q000379:methods*; D018398:Homeodomain Proteins / Q000235:genetics* / Q000378:metabolism*; D051379:Mice; D008810:Mice, Inbred C57BL; D008822:Mice, Transgenic / Q000235:genetics / Q000378:metabolism*; D011994:Recombinant Proteins / Q000378:metabolism; D013752:Tetracycline / Q000494:pharmacology; D014018:Tissue Distribution; D015534:Trans-Activators / Q000235:genetics* / Q000378:metabolism*; D015533:Transcriptional Activation / Q000187:drug effects / Q000502:physiology
chemical_list: D018398:Homeodomain Proteins; D011994:Recombinant Proteins; D015534:Trans-Activators; C084010:pancreatic and duodenal homeobox 1 protein; D013752:Tetracycline