title: Development of second- and third-generation bovine immunodeficiency virus-based gene transfer systems.
abstract: Lentivirus-based gene transfer systems have demonstrated their utility in mediating gene transfer to dividing and nondividing cells both in vitro and in vivo. An early-generation gene transfer system developed from bovine immunodeficiency virus (BIV) has been described (Berkowitz et al., J. Virol. 2001;75:3371-3382). In this paper, we describe the development of second-generation (three-plasmid) and third-generation (four-plasmid) BIV-based systems. All accessory genes (vif, vpw, vpy, and tmx) and the regulatory gene tat were deleted or largely truncated from the packaging construct. Furthermore, we split the packaging function into two constructs by expressing Rev in a separate plasmid. Together with our minimal BIV transfer vector construct and a vesicular stomatitis virus G glycoprotein-expressing plasmid, the BIV vectors were generated. The vectors produced by the three- and four-plasmid systems had titers greater than 1 x 10(6) transducing units per milliliter and were fully functional as indicated by their ability to efficiently transduce both dividing and nondividing cells. These results suggest that the accessory genes vif, vpw, vpy, and tmx are dispensable for functional BIV vector development. The modifications made to the packaging constructs improve the safety profile of the vector system. Finally, BIV vectors provide an alternative to human immunodeficiency virus-based gene transfer systems.
authors.affiliation: Genetic Therapy, a Novartis Company, Gaithersburg, MD 20878, USA.
authors.forename: Meghan
authors.initials: M
authors.lastname: Matukonis
authors.forename: Mengtao
authors.initials: M
authors.lastname: Li
authors.forename: Rene P
authors.initials: RP
authors.lastname: Molina
authors.forename: Brian
authors.initials: B
authors.lastname: Paszkiet
authors.forename: Michael
authors.initials: M
authors.lastname: Kaleko
authors.forename: Tianci
authors.initials: T
authors.lastname: Luo
mesh_terms: D000818:Animals; D002417:Cattle; D002455:Cell Division; D002460:Cell Line; D003587:Cytomegalovirus / Q000235:genetics; D004285:Dogs; D005091:Exons; D005260:Female; D015685:Fusion Proteins, gag-pol / Q000378:metabolism; D015694:Gene Products, rev / Q000235:genetics; D018014:Gene Transfer Techniques; D005814:Genes, Viral; D015316:Genetic Therapy / Q000379:methods; D005822:Genetic Vectors; D006367:HeLa Cells; D006801:Humans; D016087:Immunodeficiency Virus, Bovine / Q000235:genetics*; D008562:Membrane Glycoproteins / Q000235:genetics; D008957:Models, Genetic; D010957:Plasmids / Q000235:genetics / Q000378:metabolism; D011401:Promoter Regions, Genetic; D011995:Recombination, Genetic; D014161:Transduction, Genetic / Q000379:methods*; D014407:Tumor Cells, Cultured; D014759:Viral Envelope Proteins / Q000235:genetics; D019065:Virus Assembly
chemical_list: D015685:Fusion Proteins, gag-pol; C028391:G protein, vesicular stomatitis virus; D015694:Gene Products, rev; D008562:Membrane Glycoproteins; D014759:Viral Envelope Proteins