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. 1971 Oct;8(4):388–394. doi: 10.1128/jvi.8.4.388-394.1971

Homologous Interference by Incomplete Sendai Virus Particles: Changes in Virus-Specific Ribonucleic Acid Synthesis

A Portner 1, D W Kingsbury 1
PMCID: PMC376211  PMID: 4331647

Abstract

Incomplete Sendai virus particles (I particles) interfered with the replication of several strains of infectious Sendai virions (standard virus) but not with the replication of Newcastle disease virus, mumps virus, or Sindbis virus. I particles did not induce interferon, and ultraviolet irradiation of I particles abolished their ability to interfere. Protein synthesis was not necessary to establish interference. The degree of interference depended on the interval between exposure of cells to the I particles and challenge by standard virus, and this was reflected in the degree of inhibition of virus-specific ribonucleic acid (RNA) synthesis in infected cells. The most dramatic change was decreased accumulation of 50S virus-specific RNA in infected cells. RNA species sedimenting slower than 50S were not as markedly reduced in total amount, but hybridization experiments showed that a substantial portion of these slowly sedimenting RNA species were plus strands, presumably representing replicas of the RNA species in I particles. When I particles in insufficient numbers to interfere were added to cells as late as 8 hr after standard virus, there were no obvious changes in virus-specific RNA species in the cells; however, significant amounts of 19 and 25S RNA species, representing progeny of the I particles, appeared in the culture medium. It was concluded that interference was an intracellular event affecting an early step in virus replication. Competition by I particles for cell sites or substrates needed by standard virus seemed a less likely mechanism of interference than competition for enzymes specified by standard virus.

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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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