title: An efficient deletion mutant packaging system for defective herpes simplex virus vectors: potential applications to human gene therapy and neuronal physiology.
abstract: We have previously described a defective herpes simplex virus (HSV-1) vector system that permits the introduction of virtually any gene into nonmitotic cells. pHSVlac, the prototype vector, stably expresses Escherichia coli beta-galactosidase from a constitutive promoter in many human cell lines, in cultured rat neurons from throughout the nervous system, and in cells in the adult rat brain. HSV-1 vectors expressing other genes may prove useful for studying neuronal physiology or performing human gene therapy for neurological diseases, such as Parkinson disease or brain tumors. A HSV-1 temperature-sensitive (ts) mutant, ts K, has been used as helper virus; ts mutants revert to wild type. In contrast, HSV-1 deletion mutants essentially cannot revert to wild type; therefore, use of a deletion mutant as helper virus might permit human gene therapy with HSV-1 vectors. We now report an efficient packaging system for HSV-1 vectors using a deletion mutant, D30EBA, as helper virus; virus is grown on the complementing cell line M64A. pHSVlac virus prepared using the deletion mutant packaging system stably expresses beta-galactosidase in cultured rat sympathetic neurons and glia. Both D30EBA and ts K contain a mutation in the IE3 gene of HSV-1 strain 17 and have the same phenotype; therefore, changing the helper virus from ts K to D30EBA does not alter the host range or other properties of the HSV-1 vector system.
authors.affiliation: Division of Cell Growth and Regulation, Dana-Farber Cancer Institute, Boston, MA 02115.
authors.forename: A I
authors.initials: AI
authors.lastname: Geller
authors.forename: K
authors.initials: K
authors.lastname: Keyomarsi
authors.forename: J
authors.initials: J
authors.lastname: Bryan
authors.forename: A B
authors.initials: AB
authors.lastname: Pardee
mesh_terms: D000818:Animals; D015139:Blotting, Southern; D002478:Cells, Cultured; D015870:Gene Expression; D015316:Genetic Therapy / Q000379:methods*; D005822:Genetic Vectors; D009457:Neuroglia / Q000502:physiology; D051381:Rats; D018139:Simplexvirus / Q000235:genetics*; D013564:Sympathetic Nervous System / Q000166:cytology / Q000502:physiology; D014162:Transfection; D014779:Virus Replication; D001616:beta-Galactosidase / Q000235:genetics
chemical_list: D001616:beta-Galactosidase