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We have compared the properties of the DNA of Epstein-Barr virus (EBV) purified from HR-1 (EBV HR-1 DNA) and B95-8 (EBV B95-8 DNA) continuous lymphoblast cultures. Our data indicate that (i) the S suc of native EBV DNA relative to T4D DNA is 55S. Using the modified Burgi-Hershey relationship (5), we estimate the molecular weight of native EBV DNA is 101 (plus or minus the molecular weight of native FBV DNA by measurement of the length of 3) times 106. Estimation of the molecule relative to form II PM2 DNA yields a value of 105 (plus or minus 3) times 106. (ii) After alkali denaturation, less than 50% of EBV DNA sediments as a single band in alkaline sucrose gradients in the region expected for DNA of 50 times 406 daltons. (iii) Intact EBV HR-1 and EBV B 95-8 DNAs band at 1.718 g/cm3 and a smaller band (approximately 25% of the DNA) AT 1.720 G/CM3. (IV) EBV HR-1 DNA possesses greater than 97% of the sequences of EBV B95-8 DNA. Hybrid DNA molecules formed between (3H)EBV HR-1 DNA and EBV HR-1 DNA or EBV B95-8 DNA had identical thermal stability. EBV B95-8 DNA lacks approximately 15% of the DNA sequences of EBV HR-1 DNA. We interpret these data to mean that EBV B95-8 is derived from a parental EBV through loss of genetic complexity. This defect may be linked to the ability of EBV B95-8 to "transform" lymphocytes invitro.

DNA of Epstein-Barr virus. I. Comparative studies of the DNA of Epstein-Barr virus from HR-1 and B95-8 cells: size, structure, and relatedness