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. 1982 Dec;44(3):834–844. doi: 10.1128/jvi.44.3.834-844.1982

Non-immortalizing P3J-HR-1 Epstein-Barr virus: a deletion mutant of its transforming parent, Jijoye.

M Rabson, L Gradoville, L Heston, G Miller
PMCID: PMC256340  PMID: 6294333

Abstract

The P3J-HR-1 strain of Epstein-Barr virus (EBV) fails to immortalize human lymphocytes. We wished to understand the nature of the genomic alterations which correlated with the loss of this ability. As a first step, the heterogeneity of DNA molecules in the P3J-HR-1 line was eliminated by cell cloning. Then a physical map was prepared of virion DNA from one cell clone, designated FF452-3. By comparison with the genomes of two EBVs, B95-8 and FF41, which are competent to immortalize lymphocytes, we identified a total of eight modifications of BamHI and EcoRI restriction endonuclease fragments of EBV (FF452-3) DNA consisting of insertions, deletions, or loss of a restriction endonuclease recognition site. To determine which of these alterations might be responsible for the loss of transforming phenotype, we examined homologous DNA fragments of the Jijoye strain of EBV, the progenitor of the HR-1 strain which still retains the ability to immortalize lymphocytes. We also studied viral DNA in lymphocytes transformed in vitro by Jijoye virus. Six of the eight alterations were found both in Jijoye and in clonal HR-1 DNA and were presumably genomic traits characteristic of this lineage of EBV. A small deletion in the BamHI-K fragment of HR-1 DNA was not found in Jijoye virion DNA, but this deletion was present in intracellular Jijoye DNA. Thus only one major genomic lesion in HR-1 DNA, a deletion of at least 2.4 x 10(6) molecular weight of DNA from a fused BamHI-H-Y fragment, consistently distinguished Jijoye DNA from its non-immortalizing P3J-HR-1 derivative. This deletion is likely to affect EBV genes which are directly or indirectly involved in immortalizing lymphocytes.

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