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. 1982 Jun 11;10(11):3475–3486. doi: 10.1093/nar/10.11.3475

Effect of in vitro methylation at CpG sites on gene expression in a genome functioning autonomously in a vertebrate host.

K N Subramanian
PMCID: PMC320724  PMID: 6285302

Abstract

The effect of in vitro methylation at the HpaII sites in polyoma DNA on viral gene expression and the maintenance of the methyl groups upon replication in vivo were examined. Most of the methylatable sites are located in the early region coding for the viral large T antigen which is essential for the replication and infectivity of the viral DNA. Methylated or mock-methylated polyoma DNA produced the same number of virus plaques appearing at the same time post-transfection in either case. The lack of effect on the infectivity of the viral DNA indicates that the expression of the T antigen gene was not inhibited by methylation. Replication in vivo of the DNA also resulted in a total loss of the methyl groups introduced in vitro. These results underscore basic differences between the behavior of an autonomously functioning papovavirus DNA and the animal cell DNA vis-a-vis methylation at CpG sites. These differences might be due to subtle variations in the mechanism of regulation of gene expression and replication in the two systems.

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Selected References

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