In vitro methylation of bovine papillomavirus alters its ability to transform mouse cells.
AUTOR(ES)
Christy, B A
RESUMO
Bovine papillomavirus (BPV) was methylated in vitro at either the 29 HpaII sites, the 27 HhaI sites, or both. Methylation of the HpaII sites reduced transformation by the virus two- to sixfold, while methylation at HhaI sites increased transformation two- to fourfold. DNA methylated at both HpaII and HhaI sites did not differ detectably from unmethylated DNA in its efficiency of transformation. These results indicate that specific methylation sites, rather than the absolute level of methylated cytosine residues, are important in determining the effects on transformation and that the negative effects of methylation at some sites can be compensated for by methylation at other sites. BPV molecules in cells transformed by methylated BPV DNA contained little or no methylation, indicating that the pattern of methylation was not faithfully retained in these extrachromosomally replicating molecules. Methylation at the HpaII sites (but not the HhaI sites) in the cloned BPV plasmid or in pBR322 also inhibited transformation of the plasmids into Escherichia coli HB101 cells.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=367859Documentos Relacionados
- In vitro methylation of the hamster adenine phosphoribosyltransferase gene inhibits its expression in mouse L cells.
- Hierarchy of polyadenylation site usage by bovine papillomavirus in transformed mouse cells.
- Bovine papillomavirus vector that propagates as a plasmid in both mouse and bacterial cells.
- Interferon induces morphologic reversion with elimination of extrachromosomal viral genomes in bovine papillomavirus-transformed mouse cells.
- Angiotensin alters 45Ca2+ fluxes in bovine adrenal glomerulosa cells.