title: Negative effect of a cis-acting pBR322 element on adenovirus E1a gene expression.
abstract: A sequence element within plasmid pBR322 has a cis-acting negative effect on the expression of a cloned Ad gene in transient expression assays. The negative element is located between the PvuII and Tth111I restriction sites on pBR322 (nt 2068-2223). This element was also shown to be responsible for the decrease in focus number, when plasmids carrying Ad2 E1 genes were used to transform baby rat kidney cells. In a similar manner, this element diminished the number of G418-resistant cell foci, when plasmids containing the neo marker gene under the control of E1a promoter were used. Plasmid stability in transfected cells was not modified by deletion of this cis-acting negative element.
authors.affiliation: Laboratoire de Virologie Moléculaire, INSERM, Lille, France.
authors.forename: J P
authors.initials: JP
authors.lastname: Leite
authors.forename: C
authors.initials: C
authors.lastname: Cousin
authors.forename: A
authors.initials: A
authors.lastname: Heysen
authors.forename: J C
authors.initials: JC
authors.lastname: D'Halluin
mesh_terms: D000256:Adenoviridae / Q000235:genetics*; D017456:Adenovirus Early Proteins; D015967:Gene Expression Regulation, Viral; D005822:Genetic Vectors; D006367:HeLa Cells; D006801:Humans; D009856:Oncogene Proteins, Viral / Q000096:biosynthesis / Q000235:genetics*; D010957:Plasmids; D011993:Recombinant Fusion Proteins / Q000096:biosynthesis*; D012045:Regulatory Sequences, Nucleic Acid; D014162:Transfection
chemical_list: D017456:Adenovirus Early Proteins; D009856:Oncogene Proteins, Viral; D011993:Recombinant Fusion Proteins