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Retrovirus genomes methylated by mammalian but not bacterial methylase are non-infectious

Nature volume 304, pages 275–277 (1983)Cite this article

Abstract

The biological importance of DNA methylation for gene expression in eukaryotes is becoming increasingly evident1,2, and a direct role of methylation in gene expression has been suggested by an analysis of the infectivity of integrated retroviral genomes in a transfection assay3–5. These studies, however, did not address whether specific methylatable residues are involved in gene regulation. Methylation by sequence-specific bacterial DNA methylases has been shown to suppress the expression of some genes6–9, but not others10. To investigate the effect of methylation on gene expression without having to rely on sequence-specific methylases, a rat liver enzyme was used to methylate in vitro all C-G dinucleotides of a proviral genomic clone. This treatment reduced the biological activity of Moloney murine leukaemia virus (M-MuLV) proviral DNA by more than three orders of magnitude, whereas complete methylation of 35 HpaII sites in the same DNA had only a marginal effect. The rat methylase-induced inactivation was reversible, as treatment of recipient cells with 5-azacytidine rendered the non-infectious viral genomes biologically active. This suggests that methylation in other C-G dinucleotides than those detectable with restriction enzymes can be crucial for gene expression.

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Authors and Affiliations

  1. Robert Koch-Institut, Abteilung Biochemie, Nordufer 20, D-1000, Berlin (West), 65, FRG

    D. Simon, H. Wagner & E. Werner

  2. Heinrich-Pette-Institut für Experimentelle Virologie und Immunologie an der Universität Hamburg, Martinistrasse 52, D-2000, Hamburg, 20, FRG

    H. Stuhlmann, D. Jähner & R. Jaenisch

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  1. D. Simon
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  5. E. Werner
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  6. R. Jaenisch
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Simon, D., Stuhlmann, H., Jähner, D. et al. Retrovirus genomes methylated by mammalian but not bacterial methylase are non-infectious. Nature 304, 275–277 (1983). https://doi.org/10.1038/304275a0

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