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. 1991 Jun;65(6):2921–2928. doi: 10.1128/jvi.65.6.2921-2928.1991

E1A represses wild-type and F9-selected polyomavirus DNA replication by a mechanism not requiring depression of large tumor antigen transcription.

N J DePolo 1, L P Villarreal 1
PMCID: PMC240926  PMID: 1851864

Abstract

Polyomavirus (Py) DNA replication may be regulated to a low-level replication state in specific target cells in mice as well as in certain undifferentiated murine cell lines, such as embryocarcinoma (EC) cells. To investigate possible mechanisms by which such control may occur, we have examined the effects of E1A on Py DNA replication. Adenovirus E1A proteins repress transcriptional activation of various enhancers, including those of Py, and can stimulate DNA replication in quiescent cells, but E1A effects on Py DNA replication were unknown. We found that constitutive E1A expression in NIH 3T3 cells depressed Py DNA replication very strongly. Two F9 EC cell-selected Py enhancer variants, PyF441 and PyF101, were also examined because undifferentiated EC cells are hypothesized to have an E1A-like activity responsible for the Py restriction, and these variants activate Py DNA replication in cis in undifferentiated F9 cells. Both variants were repressed by E1A, indicating that E1A activity in 3T3 cells is not equivalent to undifferentiated F9 cell E1A-like activity. We also examined transient inducible E1A expression in cells supplying Py large tumor antigen (T-Ag). Py DNA replication was again repressed, and the inhibition increased with E1A induction. Analysis of T-Ag mRNA levels indicated that E1A repression of Py DNA replication was not an indirect result of depression of T-Ag transcription. This suggests that E1A may repress Py DNA replication by a more direct mechanism, possibly by blocking enhancer activation of DNA replication in a manner uncoupled with enhancer transcriptional control.

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Selected References

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