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J Virol. Feb 1992; 66(2): 1059–1065.
PMCID: PMC240809

Simian virus 40 large T-antigen expression decreases the G1 and increases the G2 + M cell cycle phase durations in exponentially growing cells.


The effect of simian virus 40 large T-antigen (Tag) expression on the cell cycle of exponentially growing, established, mouse NIH 3T3 fibroblasts was examined by using a sensitive flow cytometric assay to analyze nonselected cells immediately after infection with a Tag-encoding recombinant retrovirus. Tag expression resulted in reduced percentages of G1-phase cells and increased percentages of S- and G2 + M-phase cells compared with cell populations infected with a control virus not encoding the Tag gene. Cell cycle-blocking drugs were used to examine the exit rate for each of the cell cycle phases, G1, S, and G2 + M, for Tag-expressing and Tag-nonexpressing cells growing in the same cell culture dish. As a result of Tag expression, the duration of the G1 phase was decreased (average G1-phase exit duration decreased by 18%) and the duration of the G2 + M phase was increased (average G2 + M exit duration increased by 29%). The duration of S phase was unaffected by Tag expression.

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