title: Inducible expression of the human interferon beta 1 gene linked to a bovine papilloma virus DNA vector and maintained extrachromosomally in mouse cells.
abstract: A 1.6-kilobase DNA segment of the genomic human interferon beta 1 (IF-beta 1) gene was inserted into each of two possible orientations at the single HindIII site of a recombinant plasmid pBPV69T, consisting of the 69% transforming region of the bovine papilloma virus type 1 (BPV-1) and a modified SalI-SalI fragment of plasmid pBR322. After cleavage of the pBR322 sequences from this recombinant, BPV69T-IF-beta 1 hybrid DNAs were transfected onto C127 mouse cells by the standard calcium precipitation technique. Mouse cells transformed by this hybrid DNA produced low levels of human IF-beta 1 constitutively and responded to induction with either inactivated Newcastle disease virus or polyriboinosinic acid-polyribocytidylic acid. The BPV69T-IF-beta 1 hybrid DNA was nonintegrated in the transformed mouse cells but had acquired DNA sequences as a result of the transfection. Accurate transcripts of the IF-beta 1 mRNA were detected in cells only after induction. When the IF-beta 1 gene was oriented in the plasmid in the same direction of transcription as the BPV-1 genome, transcription was promoted from within the BPV-1 sequences. These results indicate that the regulatory sequences responsible for the inducible expression of the human IF-beta 1 gene are present in the 1.6-kilobase genomic segment and that these sequences can function in a free extrachromosomal state linked to BPV-1 sequences.
mesh_terms: D000818:Animals; D052688:Bovine papillomavirus 1 / Q000235:genetics; D002460:Cell Line; D005111:Extrachromosomal Inheritance; D005786:Gene Expression Regulation; D005796:Genes; D005822:Genetic Vectors; D007370:Interferon Type I / Q000235:genetics*; D051379:Mice; D011070:Poly I-C / Q000494:pharmacology; D012333:RNA, Messenger / Q000235:genetics; D014158:Transcription, Genetic; D014170:Transformation, Genetic
chemical_list: D007370:Interferon Type I; D012333:RNA, Messenger; D011070:Poly I-C