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Type: Journal article
Title: Helper plasmids for production of HIV-1-derived vectors
Author: Fuller, M.
Anson, D.
Citation: Human Gene Therapy, 2001; 12(17):2081-2093
Publisher: Mary Ann Liebert Inc Publ
Issue Date: 2001
ISSN: 1043-0342
Abstract: Vectors derived from human immunodeficiency virus type 1 (HIV-1) appear an attractive option for many gene therapy applications. This is due to their ability to transduce noncycling cell populations and to integrate their genome into the host cell chromosome, resulting in the stable genetic modification of the transduced cell. These properties have permitted the direct in vivo transduction of several tissues, including the central nervous system, retina, and liver. However, the pathogenic nature of HIV-1 has raised considerable concerns about the safety of such vector systems. To help address these concerns, we have expressed each of the primary transcriptional units encoding trans functions relevant for vector production in individual plasmid constructs. The gag-pol gene sequence was codon-optimized for expression in mammalian cells resulting in high level Rev/Rev-response element (RRE)-independent expression. Codon optimization of gag-pol also reduces sequence homology with vectors containing gag gene sequences, which results in reduced transfer of biologically active gag-pol sequences to transduced cells. Furthermore, the vif reading frame overlapping the 3' end of the pol coding sequence is destroyed by codon optimization. We have also shown that the Gag and Gag-Pol polyproteins can be efficiently expressed from separate transcriptional units. This has enabled the removal of a cis-acting viral element, the gag-pol translational frameshift sequence, from the vector/packaging system and prevents detectable transfer of biologically active sequences equivalent to the gag-pol gene to transduced cells.
Keywords: 3T3 Cells; Animals; Mice; Helper Viruses; HIV-1; Fusion Proteins, gag-pol; Gene Products, rev; Gene Products, tat; DNA, Recombinant; Codon; Blotting, Western; Transduction, Genetic; Cell Division; Transcription, Genetic; Gene Expression Regulation, Viral; Genetic Vectors; Plasmids; rev Gene Products, Human Immunodeficiency Virus; tat Gene Products, Human Immunodeficiency Virus; Viral Regulatory and Accessory Proteins; Genetic Therapy
RMID: 0020010909
DOI: 10.1089/10430340152677421
Appears in Collections:Paediatrics publications

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