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Antigens associated with the Epstein-Barr virus (EBV) replicative cycle were found in the nucleus and cytoplasm of human placental, Vero, BSC-1, and owl monkey kidney cells transfected with EBV DNA prepared from several different strains of virus. The number of antigen-positive nuclei increased when transfection was followed by cell fusion induced by inactivated Sendai virus. About 1,200 antigen-positive foci were induced per micrograms of EBV DNA. On the basis of their reactivity with various well-characterized human sera, it appears that the antigens are part of the early antigen complex. None of the four restriction endonucleases, EcoRI, HindIII, SalI, and BamHI, destroyed the ability of EBV DNA to induce early antigen. However, only SalI seemed to leave intact the full spectrum of antigen expression by the HR-1 and FF41 strains of EBV DNA. By means of transfection with recombinant DNA plasmids containing different EBV (FF41) DNA fragments regenerated by EcoRI, we showed that the coding region for early antigen was at least partially contained on the 17.2-megadalton EcoRI B fragment.

Expression of Epstein-Barr viral early antigen in monolayer tissue cultures after transfection with viral DNA and DNA fragments