title: Cre recombinase expression controlled by the hematopoietic regulatory domain of Gata-1 is erythroid-specific.
abstract: Available data suggest that gene regulation by the Gata-1 Hematopoietic Regulatory Domain (Gata-1-HRD) is limited to cells derived from the erythroid lineage. This characteristic makes Gata-1-HRD a candidate for control of cre expression in conditional knock-in and knock-out models in which erythroid-specific gene expression is essential. To characterize the specificity of Gata-1 HRD regulation of cre, transgenic mice expressing improved cre recombinase (iCre) under the control of Gata-1-HRD were generated. The founders were crossbred with mice that have an inactive loxP-containing beta-galactosidase gene that can be rescued by the cre recombinase. The beta-galactosidase activity was detected in the marrow of this crossbred mouse, but no activity was observed in other organs. To identify the cre expressing cells in marrow, double-immunostaining of marrow sections with anti-beta-galactosidase, and antibodies against various hematopoietic lineage markers or erythropoietin receptor (epor) was performed. The epor positive cells in marrow expressed beta-galactosidase, but megakaryocytic precursors and nonerythroid epor-positive cells in brain and spleen did not. We conclude that when cre is under control of Gata-1-HRD, its expression/function is limited to erythroid progenitors. The knock-in and knock-out models utilizing Gata-1-HRD-iCre, can be explored for the studies of erythroid-specific gene expression.
authors: Division of Hematology, School of Medicine, University of Utah, Salt Lake City, Utah 84132, USA.
authors: Donghoon
authors: D
authors: Yoon
authors: Bumjun
authors: B
authors: Kim
authors: Josef T
authors: JT
authors: Prchal
mesh_terms: D000818:Animals; D001789:Blood Group Antigens / Q000378:metabolism; D001854:Bone Marrow Cells / Q000166:cytology / Q000378:metabolism*; D015672:Erythroid Precursor Cells / Q000166:cytology / Q000378:metabolism*; D050982:GATA1 Transcription Factor / Q000235:genetics / Q000378:metabolism*; D015870:Gene Expression; D019426:Integrases / Q000378:metabolism*; D051379:Mice; D018345:Mice, Knockout; D008822:Mice, Transgenic; D011401:Promoter Regions, Genetic; D017467:Receptors, Erythropoietin / Q000378:metabolism; D011993:Recombinant Fusion Proteins / Q000378:metabolism; D013154:Spleen / Q000166:cytology / Q000378:metabolism*; D001616:beta-Galactosidase / Q000235:genetics / Q000378:metabolism
chemical_list: D001789:Blood Group Antigens; D050982:GATA1 Transcription Factor; C494688:GATA1 protein, human; D017467:Receptors, Erythropoietin; D011993:Recombinant Fusion Proteins; C489122:TER-119 antigen, mouse; C045073:Cre recombinase; D019426:Integrases; D001616:beta-Galactosidase