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. 1976 Mar;17(3):718–726. doi: 10.1128/jvi.17.3.718-726.1976

Recombinational-type transfer of viral DNA during bacteriophage 2C replication in Bacillus subtilis.

P Hoet, G Fraselle, C Cocito
PMCID: PMC515470  PMID: 815565

Abstract

The Bacillus subtilis phage 2C contains one molecule of double-stranded DNA of about 100 x 10(6) daltons in which thymine is replaced by hydroxymethyluracil; the two strands have different buoyant densities. Parental DNA, labeled with either [3H]uracil of [32P]phosphate, was quite effectively transferred to offspring phage, and the efficiency of transfer was the same for the two strands. Labeled nucleotide compositions of the H and L strands from parental and progeny virions were very close. These data exclude a degradation of the infecting DNA and reutilization of nucleotides. Upon infection of light unlabeled cells with heavy radioactive viruses, no DNA with either heavy or hybrid density was extracted from offspring phage. Instead, an heterogeneous population of DNA molecules of densities ranging from that of almost hybrid to that of fully light species was obtained. Shear degradation of such progeny DNA to fragments of decreasing molecular weight produced a progressive shift to the density of hybrid molecules. Denaturation of sheared DNA segments caused the appearance of labeled and heavy single-stranded segments. These findings indicate that 2C DNA replicates semiconservatively and then undergoes extensive genetic recombination with newly formed viral DNA molecules within the vegatative pool, thus mimicking a dispersive transfer of the infecting viral genome. The pieces of transferred parental DNA have an average size of 10 x 10(6) daltons.

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Selected References

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