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Journal of Virology, September 2000, p. 8307-8315, Vol. 74, No. 18
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Development of Minimal Lentivirus Vectors Derived from Simian Immunodeficiency Virus (SIVmac251) and Their Use for Gene Transfer into Human Dendritic Cells

Philippe-Emmanuel Mangeot,1 Didier Nègre,2 Bertrand Dubois,3 Arend J. Winter,4 Philippe Leissner,4 Majid Mehtali,4 Dominique Kaiserlian,3 François-Loïc Cosset,2 and Jean-Luc Darlix1,*

LaboRetro1 and Vectorologie Rétrovirale & Thérapie Génique, Unité de Virologie Humaine (INSERM-ENS no. 412),2 69364 Lyon, Immunité des muqueuses et Vaccination, INSERM no. 404, 69365 Lyon,3 and Transgene SA, 67000 Strasbourg,4 France

Received 11 February 2000/Accepted 16 June 2000

Lentivirus-derived vectors are very promising gene delivery systems since they are able to transduce nonproliferating differentiated cells, while murine leukemia virus-based vectors can only transduce cycling cells. Here we report the construction and characterization of highly efficient minimal vectors derived from simian immunodeficiency virus (SIVmac251). High-fidelity PCR amplification of DNA fragments was used to generate a minimal SIV vector formed from a 5' cytomegalovirus early promoter, the 5' viral sequences up to the 5' end of gag required for reverse transcription and packaging, the Rev-responsive element, a gene-expressing cassette, and the 3' long terminal repeat (LTR). Production of SIV vector particles was achieved by transfecting 293T cells with the vector DNA and helper constructs coding for the viral genes and the vesicular stomatitis virus glycoprotein G envelope. These SIV vectors were found to have transducing titers reaching 107 transducing units/ml on HeLa cells and to deliver a gene without transfer of helper functions to target cells. The central polypurine tract can be included in the minimal vector, resulting in a two- to threefold increase in the transduction titers on dividing or growth-arrested cells. Based on this minimal SIV vector, a sin vector was designed by deleting 151 nucleotides in the 3' LTR U3 region, and this SIV sin vector retained high transduction titers. Furthermore, the minimal SIV vector was efficient at transducing terminally differentiated human CD34+ cell-derived or monocyte-derived dendritic cells (DCs). Results show that up to 40% of human primary DCs can be transduced by the SIV vectors. This opens a new perspective in the field of immunotherapy.

* Corresponding author. Mailing address: LaboRetro, Unité de Virologie Humaine (INSERM-ENS no. 412), ENS allée d'Italie, 69364 Lyon, France. Phone: 334-72-72-81-69. Fax: 334-72-72-87-77. E-mail: Jean-Luc.Darlix{at}ens-lyon.fr.

Journal of Virology, September 2000, p. 8307-8315, Vol. 74, No. 18
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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