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. 1988 May;8(5):1993–2004. doi: 10.1128/mcb.8.5.1993

Functional analysis of the individual enhancer core sequences of polyomavirus: cell-specific uncoupling of DNA replication from transcription.

B A Campbell 1, L P Villarreal 1
PMCID: PMC363378  PMID: 2838739

Abstract

Polyomavirus (Py) enhancer core elements were compared for their ability to activate Py early transcription and DNA replication in mouse 3T6 cells, lymphoid cell lines, and undifferentiated embryonal carcinoma cells. By examining the pattern of genetic change in a number of cell-specific Py variants, we identified subenhancer sequences that may be functionally important for virus replication. Four such distinct enhancer consensus sequences were synthesized and designated as the A core (homologous with adenovirus 5 E1A enhancer), B core (homologous to the simian virus 40 A enhancer core), C core (containing an inverted repeat within the Py B enhancer), and BPV core (homologous to the bovine papillomavirus enhancer). When used to replace the complete Py B enhancer, single copies of all but the BPV element were able to fully activate Py DNA replication after transfection, but this activation was usually cell type specific. In the PCC4 embryonal carcinoma cells, only the A-core sequence was able to activate transcription and DNA replication. The BPV core sequence containing the Py F441 point change was unable to activate DNA replication in the F9 embryonal carcinoma or any other cell line. No single insertion element was dominant nor did these elements display the wild-type enhancer pattern of cell-specific activation of DNA replication. In addition, differential effects were often observed on the activation of transcription versus DNA replication. In 3T6 cells, transcription could be highly activated by the A core without a corresponding activation of DNA replication. In murine T lymphoid cell lines, the B core activated DNA replication without a corresponding increase in transcription. Furthermore, both DNA replication and, to a lesser degree, transcription often showed a strong tissue-specific dependence on the polarity of the inserted core element for activation.

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Selected References

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