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Published May 31, 1972 | public
Journal Article

Multiple Length DNA Molecules of Bacteriophage φX174

Abstract

RUSH and Warner have suggested that circular double length DNA molecules1–3 of bacteriophage S13 arise during genetic recombination, presumably in a single reciprocal recombination event4–6 between two monomeric circles7. In other systems, however, circular molecules of multiple length are produced by errors in replication8,9. We now demonstrate that most circular multiple length DNA molecules of bacteriophage φX174 arise by replication and that, moreover, some catenated DNA molecules contain interlocked rings of two different parental types.

Additional Information

© 1972 Nature Publishing Group. Received December 6, 1971; revised February 14, 1972. We thank Drs Paul Howard-Flanders and Philip Sharp for suggestions and Mrs J. S. Kim for the plates in Fig. 2. This research was supported by a grant from the US Public Health Service. R. B. is supported by a National Institutes of Health training grant, and M. E. by a fellowship from the Rockefeller Foundation.

Additional details

Created:
August 19, 2023
Modified:
October 20, 2023