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We used cloned BamHI fragments from Epstein-Barr virus strain B95-8 [EBV(B95-8)]DNA to obtain detailed restriction maps of the region of the genome adjacent to the large internal repeat cluster. These maps together with the results of hybridization experiments using a 3.1-kilobase repeat probe defined more precisely the location of the injection between the internal repeat cluster and the flanking unique-sequence DNA. On one side (UL), the repeat sequences extended 600 +/- 80 base pairs (bp) into BamHI-Y; on the other side (US), they extended 1,300 +/- 200 bp into BamHI-C. Therefore, EBV(B95-8) DNA contained a nonintegral number of 3.1-kilobase repeat units, namely, 12.6 copies. The mapping studies also revealed a second series of internal tandem repetitions in EBV(B95-8) DNA located within the BamHI-H fragment. This cluster comprised 11 copies of a 135-bp repeat unit which contained a single site for the NotI restriction endonuclease. Hybridization to these cloned EBV(B95-8) fragments using total EBV(HR-1) DNA as probe indicated that the deletion in EBV(HR-1) removed all 3,000 bp of unique-sequence DNA which lay between the large 3.1-kilobase and the small 135-bp repeat clusters. Thus, the deletion which destroyed the transforming ability in the EBV(HR-1) virus was bounded on either side by tandem repetitions.

journal of virology

Organization of the Epstein-Barr virus DNA molecule. II. Fine mapping of the boundaries of the internal repeat cluster of B95-8 and identification of additional small tandem repeats adjacent to the HR-1 deletion