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Anatomy of herpes simplex virus DNA. III. Characterization of defective DNA molecules and biological properties of virus populations containing them

Anatomy of herpes simplex virus DNA. III. Characterization of defective DNA molecules and biological properties of virus populations containing them

Journal of Virology 16(1): 153-167

We have characterized the virus progeny and its DNA from plaque-purified and undiluted passages of herpes simplex virus 1 in HEp-2 cells. Secifically, (i) infectious virus yields declined progressively in passages 1 through 10 and gradually increased at passages 11 through 14. The yields correlated with PFU/particle ratios. (ii) In cells infected with virus from passages 6 through 10, there was an overproduction of an early viral polypeptide (no. 4) and a delay in the synthesis of late viral proteins. In addition, the virus in these passages interfered with the replication of a nondefective marker virus. Cells infected with passage 14 virus produced normal amounts of polypeptide 4 and, moreover, this virus showed minimal interfering capacity. (iii) In addition to DNA of density 1.726 g/cm-3, which was the sole component present in viral progeny of passage 0, passages 6 through 14 contained one additional species (p 1.732) and in some instances (passages 6 and 10) also DNA of an intermediate buoyant density. The ratio of p 1.732 to p 1.726 DNA increased to a maximum of 4 in passages 6 through 9 and gradually decreased to 1 in passages 10 through 14. (iv) p 1.732 DNA cannot be differentiated from p 1.726 DNA with respect to size; however, it has no Hin III restriction enzyme cleavage sites and yields only predominantly two kinds of fragments with molecular weights of 5.1 x 10-6 and 5.4 x 10-6 upon digestion with EcoRI enzyme. (v) Partial denaturation profiles of purified p 1.732 DNA from passage 14 revealed the presence of two types of tandemly repeated units corresponding roughly in size to the EcoRI fragments and situated in different molecules. (vi) In addition to the two kinds of p 1.732 molecules consisting of tandem repaeat units of different sizes, other evidence for the diversity of defective DNA molecules emerged from comparisons of specific infectivity and interfering capacity of the progeny from various passages. The data suggest that some of the particles with DNA of normal buoyant density (1.726) must also be defective since the capacity to interfere and to produce an excess of polypeptide 4 did not appear to be proportional to the amount of high-buoyant-density defective DNA. The data suggest that defective interfering particles are replaced by defective particles with diminished capacity to interfere and that more than one species of defective DNA molecules evolves on serial preparation of HSV.

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Accession: 039273593

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PMID: 166202

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