CpG methylation of an endogenous retroviral enhancer inhibits transcription factor binding and activity.

B. T. Lamb, K. Satyamoorthy, L. Li, D. Solter, C. C. Howe

Research output: Contribution to journalArticle

19 Scopus citations


The endogenous retrovirus, intracisternal A-particle (IAP), is expressed at unique stages during murine embryogenesis and is also activated during the in vitro differentiation of F9 cells. We have examined the DNA elements and protein factors that control IAP expression during F9 differentiation. In the present study an IAP upstream enhancer (IUE) is identified by transient transfection assays and found to be active in both undifferentiated and differentiated cells. Further analyses reveal that a ubiquitous 65 kDa protein factor, the IUE binding protein (IUEB), binds with the IUE. Site-specific methylation within the IUEB binding site strongly inhibits both IUEB binding and IUE transcriptional activity, suggesting that methylation may regulate IUE function and IAP expression.

Original languageEnglish (US)
Pages (from-to)185-196
Number of pages12
JournalGene expression
Issue number3
StatePublished - 1991


ASJC Scopus subject areas

  • Molecular Biology
  • Genetics

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