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Nucleic Acids Research, 1982, Vol. 10, No. 24 8099-8112
© 1982

Articles

Sequence of the junction in adenovirus 2-SV40 hybrids: examples of illegitimate recombination

Leona E. Ling, M. Michele Manos and Yakov Gluzman

Cold Spring Harbor Laboratory P.O. Box 100 Cold Spring Harbor NY 11724, USA

Received September 9, 1982. Accepted November 9, 1982.

The nucleotide sequences of six Ad2–SV40 junctions from three Ad2–SV40 hybrid viruses (Ad2++ HEY, Ad2++ LEY and Ad2+ D1) were determined. Comparison of parental adenovirus 2 and SV40 DNA sequences with the sequence at the Ad2–SV40 junctions revealed that 5 out of 6 junctions are abrupt transitions from Ad2 to SV40 DNA, and in one case (Ad2 ++ LEY, right junction) there is an additional nucleotide at the junction, which cannot be ascribed to either DNA. Ad2++ HEY and Ad2+ Dl right junctions are identical and Ad2++ LEY and Ad2+ ND4 left junctions are identical, a result that strongly suggests these Ad2–SV40 hybrids arose by recombination between the linear Ad2 DNA and circular SV40 DNA, followed by recombination between Ad2 DNA and SV40 DNA present in the Ad2–SV40 hybrid DNA. The unambiguous transition of Ad2 DNA into SV40 DNA at the junction sites is and example of recombination events which have apparently occurred without any homology at the recombination site.


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