Abstract
NIH 3T3 cells were transfected with restriction endonuclease and cloned human cytomegalovirus DNA fragments to identify the transforming region(s). Cleavage of human cytomegalovirus strain AD169 DNA with XbaI and HindIII left a transforming region intact whereas EcoRI inactivated this function. Transfection of cells with cosmids containing human cytomegalovirus DNA spanning the entire genome resulted in transformation by one cosmid, pCM1058, with the AD169 HindIII DNA fragments E, R, T, and a'. Cells were selected for their growth in 1.2% methylcellulose. The clones isolated had a significant replating efficiency and were oncogenic in BALB/c nu/nu mice. Transfection of cosmids and plasmids containing subsets of the viral sequences in pCM1058 identified a common region possessed by all of the transforming recombinant molecules. This region was in the HindIII E fragment with the left boundary defined by the EcoRI d-R junction and the right boundary defined by the HindIII E-T junction. Further mapping and transfection experiments determined that the transforming region was contained without a 2.9-kilobase fragment between map units 0.123 and 0.14 on the prototype molecule of the AD169 strain.
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