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. 1987 Jun;61(6):1985–1991. doi: 10.1128/jvi.61.6.1985-1991.1987

Two strains of Epstein-Barr virus (B95-8 and a P3HR-1 subclone) that lack defective genomes induce early antigen and cause abortive infection of Raji cells.

J C Lin, N Raab-Traub
PMCID: PMC254207  PMID: 3033325

Abstract

The heterogeneity of Epstein-Barr virus (EBV) obtained from P3HR-1 cells has permitted derivation of a distinct subclone of P3HR-1 (L. Heston, M. Rabson, N. Brown, and G. Miller, Nature (London) 295:160-163, 1982). We have analyzed the biologic properties and genomic structure of this subclonal virus (clone 13) compared with those of parental P3HR-1 and B95-8 viruses. Synthesis of EBV compared with those of parental P3HR-1 and B95-8 viruses. Synthesis of EBV proteins in Raji cells superinfected with virus derived from P3HR-1, clone 13, and B95-8 was analyzed both by fluorography of radiolabeled proteins and by immunoblotting. Highly concentrated preparations of clone 13 and B95-8 virus induced most of the spectrum of EBV proteins in Raji cells with the exception of the 145,000-, 140,000-, and 110,000-molecular-weight proteins, which were either undetectable or reduced. Moreover, both clone 13 and B95-8 viruses also induced the same patterns of early antigen diffuse components as the parental P3HR-1 virus did. However, only P3HR-1 virus could induce EBV DNA synthesis in superinfected Raji cells, as determined both by buoyant density centrifugation and by in situ cytohybridization with biotinylated recombinant EBV DNA probes. Defective heterogeneous molecules present in P3HR-1 virus have been implicated in early antigen induction after superinfection of Raji cells. Therefore, Southern blots of clone 13, P3HR-1, and B95-8 viruses were hybridized to recombinant EBV fragments representing the sequences contained within the defective molecules in P3HR-1. The parental P3HR-1 contained the previously described defective molecules. No evidence for defective molecules was found in clone 13 or B95-8 viruses. These data indicate that concentrated preparations of both clone 13 and B95-8 viruses can induce abortive infection in Raji cells, but while the defective molecules are not needed for induction of early antigen diffuse components, they may be required for the induction of viral DNA synthesis.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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