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J Virol. 1977 January; 21(1): 119-130

Formation and structure of infectious DNA of spleen necrosis virus.

ABSTRACT

The kinetics of formation and the structure of infectious DNA of spleen necrosis virus were determined. Nonintegrated infectious viral DNA first appeared 18 to 24 h after infection of dividing cells and persisted for more than 14 days. The nonintegrated infectious viral DNA was in the form of either a double-stranded linear DNA with a molecular weight of 6 X 10(6), detected in both the cytoplasm and nucleus, or a closed circular DNA of the same molecular weight, detected primarily in the nucleus. Integrated infectious viral DNA appeared soon after the nonintegrated infectious viral DNA and was the predominant form of infectious viral DNA late after infection. Integration of the spleen necrosis virus DNA into the chicken cell genome was demonstrated by three independent criteria. Nucleic acid hybridization indicated that the linear infectious viral DNA had a 5- to 10-fold higher specific infectivity than either the closed circular or integrated infectious viral DNA. Infectious viral DNA did not appear in infected stationary cells, indicating some cellular influence on the formation of infectious viral DNA.

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