The Cre-loxP recombination system allows manipulation of DNA within a chromosomal environment. This system comprises a phage encoded recombinase (Cre) and a target site (loxP) in the genome. Recombination between two directly orientated loxP sites excises the intervening DNA as a circular molecular. Circular DNA sequences containing a single loxP site can be inserted as single copies into a pre-existing loxP site in the genome. The incorporation of loxP sites into retroviral vectors may offer several advantages. Firstly, it may allow removal of the potentially detrimental neomycin phosphotransferase gene (neoR gene) after selection of producer cell lines. Secondly, additional DNA sequences could be introduced into pre-existing proviral integrants of a high titer retroviral producer line. A retroviral vector containing the neoR gen and SV40 promoter and Herpes Simplex TK gene flanked by loxP sites has been constructed. High titer producer liens have been generated and shown to be G418 resistant and sensitive to ganciclovir. The ability of Cre recombinase to selectively remove the TK gene in these producer cell lines will be assessed. The titer of the TK-less producer cell line will be compared with the parental line. A second retroviral vector containing the neoR gene and the SV40 promoter with a single loxP site immediately 3' has also been constructed. High titer producer lies will be generated and the ability of Cre recombinase to insert a second selectable marker into the targeted site in the genome will be assessed. Once again the titer of this new producer line will be determined and compared to the parental line. This strategy may allow the generation of master producer lines in which targeted insertion of a gene of interest will rapidly generate high titer viral stocks.

Agency
National Institute of Health (NIH)
Institute
National Heart, Lung, and Blood Institute (NHLBI)
Type
Research Program Projects (P01)
Project #
5P01HL053749-05
Application #
6110416
Study Section
Project Start
1998-09-01
Project End
1999-08-31
Budget Start
1997-10-01
Budget End
1998-09-30
Support Year
5
Fiscal Year
1998
Total Cost
Indirect Cost
Name
St. Jude Children's Research Hospital
Department
Type
DUNS #
067717892
City
Memphis
State
TN
Country
United States
Zip Code
38105
Zhao, Hui Fen; Abraham, Allistair; Kim, Yoon-Sang et al. (2017) Lentiviral Transfer of ?-Globin with Fusion Gene NUP98-HOXA10HD Expands Hematopoietic Stem Cells and Ameliorates Murine ?-Thalassemia. Mol Ther 25:593-605
De Ravin, Suk See; Wu, Xiaolin; Moir, Susan et al. (2016) Lentiviral hematopoietic stem cell gene therapy for X-linked severe combined immunodeficiency. Sci Transl Med 8:335ra57
Abraham, Allistair; Kim, Yoon-Sang; Zhao, Huifen et al. (2016) Increased Engraftment of Human Short Term Repopulating Hematopoietic Cells in NOD/SCID/IL2r?null Mice by Lentiviral Expression of NUP98-HOXA10HD. PLoS One 11:e0147059
Wielgosz, Matthew M; Kim, Yoon-Sang; Carney, Gael G et al. (2015) Generation of a lentiviral vector producer cell clone for human Wiskott-Aldrich syndrome gene therapy. Mol Ther Methods Clin Dev 2:14063
Pestina, Tamara I; Hargrove, Phillip W; Zhao, Huifen et al. (2015) Amelioration of murine sickle cell disease by nonablative conditioning and ?-globin gene-corrected bone marrow cells. Mol Ther Methods Clin Dev 2:15045
Zhou, Sheng; Bonner, Melissa A; Wang, Yong-Dong et al. (2015) Quantitative shearing linear amplification polymerase chain reaction: an improved method for quantifying lentiviral vector insertion sites in transplanted hematopoietic cell systems. Hum Gene Ther Methods 26:4-12
Urbinati, Fabrizia; Hargrove, Phillip W; Geiger, Sabine et al. (2015) Potentially therapeutic levels of anti-sickling globin gene expression following lentivirus-mediated gene transfer in sickle cell disease bone marrow CD34+ cells. Exp Hematol 43:346-351
Treanor, Louise M; Zhou, Sheng; Janke, Laura et al. (2014) Interleukin-7 receptor mutants initiate early T cell precursor leukemia in murine thymocyte progenitors with multipotent potential. J Exp Med 211:701-13
Griffith, Linda M; Cowan, Morton J; Notarangelo, Luigi D et al. (2014) Primary Immune Deficiency Treatment Consortium (PIDTC) report. J Allergy Clin Immunol 133:335-47
De Ravin, Suk See; Gray, John T; Throm, Robert E et al. (2014) False-positive HIV PCR test following ex vivo lentiviral gene transfer treatment of X-linked severe combined immunodeficiency vector. Mol Ther 22:244-245

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