Abstract
The injection of purified Rous sarcoma virus (RSV) (Prague strain) into Drosophila melanogaster (Oregon R line) eggs changes the fly phenotype in certain cases, and RSV-specific sequences can be identified in the Drosophila genome (ref. 1 and preceding paper). Here we have used Southern blotting to analyse in greater detail the proviral DNA present in several mutant lines of D. melanogaster produced by microinjection of intact RSV or plasmid DNA containing the viral insert. In certain populations of flies, RSV provirus was found to be incorporated into cellular DNA, and in one mutant family the unintegrated form of plasmid DNA was identified. Generally, the presence of injected genetic material in fly cells correlated with morphological changes in Drosophila.
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