Abstract
The complexity and abundance of Epstein-Barr (EBV)-specific RNA in cell cultures restringently, abortively, and productively infected with EBV has been analyed by hybridization of the infected cell RNA with purified viral DNA. The data indicate the following. (i) Cultures containing productively infected cells contain viral RNA encoded by at least 45% of EBV DNA, and almost all of the species of viral RNA are present in the polyadenylated and polyribosomal RNA fractions. (ii) Restringently infected Namalwa and Raji cultures, which contain only intranuclear antigen, EBNA, and enhanced capacity for growth in vitro, contain EBV RNA encoded by at least 16 and 30% of the EBV DNA, respectively. The polyadenylated and polyribosomal RNA fractions of Raji and Namalwa cells are enriched for a class of EBV RNA encoded by approximately 5% of EBV DNA. The same EBV DNA sequences encode the polyadenylated and polyribosomal RNA of both Raji and Namalwa cells. (iii) After superinfection of Raji cultures with EBV (HR-1), the abortively infected cells contain RNA encoded by at least 41% of EBV DNA. The polyadenylated RNA of superinfected Raji cells is enriched for a class of EBV RNA encoded by approximately 20% of EBV HR-1 DNA. Summation hybridization experiments suggest that the polyadenylated RNA in superinfected Raji cells is encoded by the same DNA sequences as encode RNA present in Raji cells before superinfection, most of which is not polyadenylated. That the same EBV RNA sequences are present in the polyadenylated and polyribosomal fractions of two independently derived, restringently infected cell lines suggests that these RNAs may specify functions related to maintenance of the transformed state. The complexity of this class of RNA is adequate to specify a sequence of a least 5,000 amino acids. That only some RNA species are polyadenylated in restringent and abortive infection suggests that polyadenylation or whatever determines polyadenylation may play a role in the restricted expression of the EVB genome.
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