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. 1981 Nov;40(2):403–410. doi: 10.1128/jvi.40.2.403-410.1981

Partial replication of UV-irradiated T4 bacteriophage DNA results in amplification of specific genetic areas.

S K Ling, H H Vogelbacker, L L Restifo, T Mattson, A W Kozinski
PMCID: PMC256641  PMID: 7321092

Abstract

Upon infection of Escherichia coli with bromodeoxyuridine-labeled t4 phage that had received 10 lethal hits of UV irradiation, a sizable amount of phage DNA was synthesized (approximately 36 phage equivalent units of DNA per infected bacterium), although very little multiplicity reactivation occurs. This progeny DNA was isolated and analyzed. This DNA was biased in its genetic representation, as shown by hybridization to cloned segments of the T4 genome immobilized on nitrocellulose filters. Preferentially amplified areas corresponded to regions containing origins of T4 DNA replication. The size of the progeny DNA increased with time after infection, possibly due to recombination between partial replicas and nonreplicated subunits or due to the gradual overcoming of the UV damage. As the size of the progeny DNA increased, all of the genes were more equally represented, resulting in a decrease in the genetic bias. Amplification of specific genetic areas was also observed upon infection with UV-irradiated, nonbromodeoxyuridine-substituted (light) phage. However, the genetic bias observed in this case was not as great as that observed with bromodeoxyuridine-substituted phage. This is most likely due to the higher efficiency of multiplicity reactivation of the light phage.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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