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. 1979 Aug;31(2):315–324. doi: 10.1128/jvi.31.2.315-324.1979

DNA of Epstein-Barr virus. VI. Mapping of the internal tandem reiteration.

D Given, E Kieff
PMCID: PMC353453  PMID: 225556

Abstract

Epstein-Barr virus (B95-8) DNA consists of short (10 X 10(6)) and long (87 X 10(6)) unique DNA sequences joined by 10 tandem reiterations of a 1.85 X 10(6) DNA segment. The reiterated sequence contains BamI and BglII sites separated by 4 X 10(5). The 4.5 X 10(5) and 14.0 X 10(5) segments generated by cleavage of the reiterated DNA with BamI and BglII contain sequences which hybridize to each other, suggesting that the internal tandemly reiterated sequence has a direct or inverted repeat within it. The opposite ends of the linear, nicked, double-stranded DNA molecule (R. F. Pritchett, S. D. Hayward, and E. D. Kieff, J. Virol. 15:556--569, 1975) consist of from 1 to 12 direct repeats of another 3 X 10(5) sequence (D. Given and E. Kieff, J. Virol. 28:524--542, 1978; D. Given, D. Yee, K. Griem, and E. Kieff, J. Virol. 30:852--862, 1979). There is no homology between the internal reiterated sequence and either terminus. However, part of the internal reiteration (less than 5 X 10(5) is reiterated at two separate locations in the long unique region. The internal reiterations are a source of variation within EBV (B95-8) DNA preparations. Thus, although the majority of molecules contain 10 tandem reiterations, some molecules have 9, 8, 7, 6, 5, 4, or fewer tandem reiterations. A consequence of this variability is that the KpnI A fragment and the EcoRI/Hsul A fragment consist of a family of seven or more fragments differing in the number of tandem internal reiterations. The EcoRI/HsuI A fragment of EBV (W91) DNA is approximately 6 X 10(6) smaller than the largest and dominant EcoRI/HsuI A fragment of EBV (B95-8) DNA. EBV (W91 DNA also differs from EBV (B95-8) DNA by an additional 7 X 10(6) to 8 X 10(6) of DNA in the long unique DNA region (D. Given and E. Kieff, J. Virol. 28:524--542, 1978; N. Raab-Traub, R. Pritchett, and E. Kieff, J. Virol. 27:388--398, 1978). These data suggest the possibility that the smaller number of internal reiterations in EBV (W91) DNA may be a consequence of the additional unique DNA and a restriction in the overall size of EBV DNA.

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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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