title: Comparison of HIV- and EIAV-based vectors on their efficiency in transducing murine and human hematopoietic repopulating cells.
abstract: The use of lentiviral vectors for gene transfer into hematopoietic stem cells has raised considerable interest as these vectors can permanently integrate their genome into quiescent cells. Vectors based on alternative lentiviruses would theoretically be safer than HIV-1-based vectors and could also be used in HIV-positive patients, minimizing the risk of generating replication-competent virus. Here we report the use of third-generation equine infectious anemia virus (EIAV)- and HIV-1-based vectors with minimal viral sequences and absence of accessory proteins. We have compared their efficiency in transducing mouse and human hematopoietic stem cells both in vitro and in vivo to that of a previously documented second-generation HIV-1 vector. The third-generation EIAV- and HIV-based vectors gave comparable levels of transduction and transgene expression in both mouse and human NOD/SCID repopulating cells but were less efficient than the second-generation HIV-1 vector in human HSCs. For the EIAV vector this is possibly a reflection of the lower protein expression levels achieved in human cells, as vector copy number analysis revealed that this vector exhibited a trend to integrate equally efficiently compared to the third-generation HIV-1 vector in both mouse and human HSCs. Interestingly, the presence or absence of Tat in viral preparations did not influence the transduction efficiency of HIV-1 vectors in human HSCs.
authors.affiliation: Hematopoietic Stem Cell Laboratory, Cancer Research UK, 44 Lincoln's Inn Fields, London WC2A 3PX, UK.
authors.forename: Elena K
authors.initials: EK
authors.lastname: Siapati
authors.forename: Brian W
authors.initials: BW
authors.lastname: Bigger
authors.forename: James
authors.initials: J
authors.lastname: Miskin
authors.forename: Daniel
authors.initials: D
authors.lastname: Chipchase
authors.forename: Kathryn L
authors.initials: KL
authors.lastname: Parsley
authors.forename: Kyriacos
authors.initials: K
authors.lastname: Mitrophanous
authors.forename: Mike
authors.initials: M
authors.lastname: Themis
authors.forename: Adrian J
authors.initials: AJ
authors.lastname: Thrasher
authors.forename: Dominique
authors.initials: D
authors.lastname: Bonnet
mesh_terms: D000818:Animals; D018952:Antigens, CD34 / Q000096:biosynthesis; D002460:Cell Line; D005434:Flow Cytometry; D018014:Gene Transfer Techniques; D015316:Genetic Therapy / Q000295:instrumentation* / Q000379:methods; D005822:Genetic Vectors; D049452:Green Fluorescent Proteins / Q000378:metabolism; D006678:HIV / Q000235:genetics*; D006412:Hematopoietic Stem Cells / Q000378:metabolism*; D006801:Humans; D066298:In Vitro Techniques; D004860:Infectious Anemia Virus, Equine / Q000235:genetics*; D016086:Lentivirus / Q000235:genetics / Q000378:metabolism; D017493:Leukocyte Common Antigens / Q000096:biosynthesis; D051379:Mice; D008810:Mice, Inbred C57BL; D016688:Mice, Inbred NOD; D016513:Mice, SCID; D012313:RNA / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013045:Species Specificity; D013234:Stem Cells / Q000166:cytology
chemical_list: D018952:Antigens, CD34; D049452:Green Fluorescent Proteins; D012313:RNA; D017493:Leukocyte Common Antigens