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. 1973 Aug;12(2):349–359. doi: 10.1128/jvi.12.2.349-359.1973

Multiple Initiation of Bacteriophage T4 DNA Replication: Delaying Effect of Bromodeoxyuridine

Karin Carlson a,1
PMCID: PMC356630  PMID: 4747986

Abstract

Effects of bromodeoxyuridine (BUdR) substitutions in phage T4 DNA on the initial stages of DNA replication were investigated. Electron microscope studies of partially replicated, light (thymidine-containing) T4 DNA revealed the presence of multiple loops and forks. These DNA preparations had no BUdR in either parental or newly synthesized DNA, and the observations thus show that multiple initiation of DNA replication is a normal event in T4 development and is not caused by the presence of BUdR. A comparison of early replicative stages of light and heavy (BUdR-containing) DNA in cells mixedly infected with light and heavy T4 phage showed that early DNA synthesis occurs preferentially on the light template. Heavy and light parental DNA became associated with the protein complex of replicative DNA with equal efficiency, and there was no effect of BUdR on the net rate of DNA synthesis after infection. Newly synthesized DNA from heavy templates sedimented more slowly through alkaline sucrose gradients than did newly synthesized DNA from light templates and appeared to represent fewer replicative regions per molecule. These data indicate that BUdR substitutions in the DNA caused a slight delay in initiation but that replication of heavy DNA proceeded normally once initiated.

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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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