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. 1977 Aug;23(2):421–429. doi: 10.1128/jvi.23.2.421-429.1977

DNA of Epstein-Barr Virus. II. Comparison of the Molecular Weights of Restriction Endonuclease Fragments of the DNA of Epstein-Barr Virus Strains and Identification of End Fragments of the B95-8 Strain

S Diane Hayward 1, Elliott Kieff 1
PMCID: PMC515844  PMID: 196117

Abstract

Incubation of the DNA of the B95-8 strain of Epstein-Barr virus [EBV (B95-8) DNA] with EcoRI, Hsu I, Sal I, or Kpn I restriction endonuclease yielded 8 to 15 fragments separable on 0.4% agarose gels and ranging in molecular weight from less than 1 to more than 30 × 106. Bam I and Bgl II yielded fragments smaller than 11 × 106. Preincubation of EBV (B95-8) DNA with lambda exonuclease resulted in a decrease in the Hsu I A and Sal I A and D fragments, indicating that these fragments are positioned near termini. The electrophoretic profiles of the fragments produced by cleavage of the DNA of the B95-8, HR-1, and Jijoye strains of EBV were each distinctive. The molecular weights of some EcoRI, Hsu I, and Sal I fragments from the DNA of the HR-1 strain of EBV [EBV (HR-1) DNA] and of EcoRI fragments of the DNA of the Jijoye strain of EBV were identical to that of fragments produced by cleavage of EBV (B95-8) DNA with the same enzyme, whereas others were unique to each strain. Some Hsu I, EcoRI, and Sal I fragments of EBV (HR-1) DNA and Kpn I fragments of EBV (B95-8) DNA were present in half-molar abundance relative to the majority of the fragments. In these instances, the sum of the molecular weights of the fragments was in excess of 108, the known molecular weight of EBV (HR-1) and (B95-8) DNA. The simplest interpretation of this finding is that each EBV (HR-1), and possibly also (B95-8), DNA preparation contains two populations of DNA molecules that differ in the arrangement of DNA sequences about a single point, such as has been described for herpes simplex virus DNA. Minor fragments could also be observed if there were more than one difference in primary structure of the DNAs. The data do not exclude more extensive heterogeneity in primary structure of the DNA of the HR-1 strain. However, the observation that the relative molar abundance of major and minor fragments of EBV (HR-1) DNA did not vary between preparations from cultures that had been maintained separately for several years favors the former hypothesis over the latter.

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Selected References

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