title: Interruption of env gene expression depending on the length of the SV40 early region used for the polyA signal.
abstract: In order to invent a screening system to check in vivo gene function and the efficiency of gene transfer mediated by a retroviral vector system, we established a novel packaging cell, PacNIH/A8, based on the neuropathogenic retrovirus A8-V. To construct the expression vector, pA8(Psi-), which expresses the genes gag, pol and env derived from A8-V, the SV40 early region was used for the polyadenylation signal (polyA signal). When a 0.85 kbp fragment in the SV40 early region was employed for the expression vector (pA8(Psi-)beta), env expression was abolished. This abolition was rescued by shortening the SV40 early region to 0.14 kbp (pA8(Psi-)delta). The NHI3T3 cells transfected with pA8(Psi-)delta showed expressions of both env and gag genes.
authors.affiliation: Department of Bioinformatics, Faculty of Engineering, Soka University, Tokyo 192-8577, Japan.
authors.forename: Kei
authors.initials: K
authors.lastname: Yamakawa
authors.forename: Sayaka
authors.initials: S
authors.lastname: Takase-Yoden
authors.forename: Rihito
authors.initials: R
authors.lastname: Watanabe
mesh_terms: D000818:Animals; D005622:Friend murine leukemia virus / Q000235:genetics*; D015967:Gene Expression Regulation, Viral; D015752:Genes, env / Q000235:genetics*; D051379:Mice; D041681:NIH 3T3 Cells; D011061:Poly A / Q000235:genetics*; D012045:Regulatory Sequences, Nucleic Acid / Q000235:genetics*; D013539:Simian virus 40 / Q000235:genetics*
chemical_list: D011061:Poly A