Hepatitis B virus suppresses expression of human beta-interferon.
To determine whether hepatitis B virus (HBV) regulates the expression of the human beta-interferon gene, a series of recombinant bovine papilloma virus plasmids containing the human interferon gene and various fragments of the HBV genome were constructed and used to transform C127 cells, a murine fibroblast line. Analysis of the DNA from transformed C127 cells indicated that the interferon gene was intact and that the plasmids replicated as stable multicopy elements. The 1828-base-pair BamHI HBV DNA fragment containing the core antigen gene, but not the 2755-base-pair Bgl II HBV DNA fragment encoding both the surface antigen and the X antigen, suppressed the production of human beta-interferon. No effect by any of the recombinant plasmids on the synthesis of murine interferon was detected. The suppression of human beta-interferon by HBV occurs via a trans-acting factor. A frameshift mutation within the HBV core gene alleviates the inhibitory activity; thus we infer that the core protein is this factor or is crucially associated with this activity.
Twu
J S
JS
Department of Microbiology and Immunology, Indiana University School of Medicine, Indianapolis 46223.
Lee
C H
CH
Lin
P M
PM
Schloemer
R H
RH
D000818:Animals; D052688:Bovine papillomavirus 1 / Q000235:genetics*; D002472:Cell Transformation, Viral; D002478:Cells, Cultured; D003001:Cloning, Molecular; D004262:DNA Restriction Enzymes; D005796:Genes; D005814:Genes, Viral; D006515:Hepatitis B virus / Q000235:genetics*; D006801:Humans; D007371:Interferon-gamma / Q000235:genetics*; D051379:Mice; D009154:Mutation; D027383:Papillomaviridae / Q000235:genetics*; D010957:Plasmids; D014158:Transcription, Genetic; D014162:Transfection
D007371:Interferon-gamma; D004262:DNA Restriction Enzymes