title: Cre recombinase-mediated gene targeting of mesenchymal cells.
abstract: Loss-of-function approaches by the Cre/loxP technology have provided powerful tools for functional analyses of genes of interest expressed preferentially in a particular tissue. Here we describe the generation of transgenic mouse lines expressing Cre recombinase under the control of the promoter/enhancer unit of the gene for the alpha2 chain of collagen type I (Col1alpha2). As an expression vector, we used a P1-derived artificial chromosome (PAC), which harbors approximately 100 kb carrying the col1alpha2 gene. The improved coding sequence of the Cre recombinase was introduced to replace the first exon of col1alpha2. Cre expression was determined by immunohistochemistry and Cre-mediated onset of beta-galactosidase expression in ROSA26R-Cre reporter mice. In four analyzed transgenic lines, Cre recombinase was efficiently expressed during embryogenesis and in adult animals in cells of mesenchymal origin, such as dermal fibroblasts, mesenchymal cells of blood vessel walls, and cells in fibrous connective tissues surrounding internal organs.
authors.affiliation: Division of Signal Transduction and Growth Control, Deutsches Krebsforschungszentrum, Heidelberg, Germany.
authors.forename: Lore
authors.initials: L
authors.lastname: Florin
authors.forename: Heike
authors.initials: H
authors.lastname: Alter
authors.forename: Hermann-Josef
authors.initials: HJ
authors.lastname: Gröne
authors.forename: Axel
authors.initials: A
authors.lastname: Szabowski
authors.forename: Günther
authors.initials: G
authors.lastname: Schütz
authors.forename: Peter
authors.initials: P
authors.lastname: Angel
mesh_terms: D000818:Animals; D027042:Chromosomes, Artificial, P1 Bacteriophage / Q000502:physiology*; D003094:Collagen / Q000235:genetics*; D024042:Collagen Type I; D004791:Enzyme Inhibitors / Q000378:metabolism; D005260:Female; D018507:Gene Expression Regulation, Developmental / Q000235:genetics; D018390:Gene Targeting / Q000379:methods*; D019426:Integrases / Q000235:genetics* / Q000378:metabolism*; D007763:Lac Operon; D008297:Male; D008648:Mesoderm / Q000502:physiology*; D051379:Mice; D008822:Mice, Transgenic / Q000196:embryology / Q000235:genetics* / Q000254:growth & development; D011401:Promoter Regions, Genetic / Q000235:genetics; D011995:Recombination, Genetic; D001616:beta-Galactosidase / Q000235:genetics
chemical_list: D024042:Collagen Type I; D004791:Enzyme Inhibitors; D003094:Collagen; C045073:Cre recombinase; D019426:Integrases; D001616:beta-Galactosidase