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We have developed a simple method based on cotransfection of overlapping DNA restriction fragments for construction of recombinants of adenovirus type 2 (Ad2) and Ad5. When Ad2 DNA digested with restriction endonuclease EcoRI was cotransfected with Ad5 DNA digested with SalI, recombination occurred between Ad2 EcoRI-A (map position 0 to 59) and Ad5 SalI-A (map position 45 to 100). Analysis of the recombinant DNAs by digestion with EcoRI or BamHI restriction endonucleases indicated that, as expected, recombination had occurred in overlapping sequences (map position 45 to 59) between the Ad2 EcoRI-A fragment and the Ad5 SalI-A fragment. By using this method, several recombinants were constructed between a large-plaque (lp) mutant of Ad2 and wild-type Ad5. Cleavage of the recombinant genomes with restriction endonucleases BamHI, EcoRI, and HindIII revealed that the lp mutation is located within the left 41% of Ad2 genome.

Physical mapping of a large-plaque mutation of adenovirus type 2