Virus-specific nucleotide sequences in duck cells transformed by chicken and duck-adapted Rous sarcoma virus

Adaptation of PR-RSV-C on duck cells results in successful and efficient replication of the adapted virus in duck cells. The adapted variant, daPR-RSV-C, was compared with the parental chicken-cell derived PR-RSV-C. No differences in the efficiency of integration and in the number of integrated proviral copies in duck cells were found. However, the structure of proviral DNA of the adapted virus was different. Whereas EcoRI and HindIII digestion showed no differences between chicken-cell derived PR-RSV-C and the daPR-RSV-C, a new restriction site was found for BamHI endonuclease, which is probably located at the 3' end of the env gene.