Funcitonal activity and chromatin configuration of SV40 enhancer injected in Xenopus laevis oocytes

Giovanni Spinelli, Gennaro Ciliberto

Research output: Contribution to journalArticle


The SV40 enhancer microinjected into the nuclei of X. laevis oocytes is able to activate transcription about 100-fold when cloned upstream of the SV40 early promoter region or about 10-fold regardless of its orientation when located at a long distance from a test gene (bacterial chloramphenicol acetyl transferase). This effect is qualitatively and quantitatively similar to that observed when analogous constructions were transfected into mammalian cells. Making use of a direct labelling technique for the analysis of the chromatin structure we could show that the SV40 enhancer region in the microinjected plasmids is particularly accessible to cleavage with MNase or DNAse I. Single sites in the 72 bp repeats have been mapped at the nucleotide level.

Original languageEnglish
Pages (from-to)8065-8081
Number of pages17
JournalNucleic Acids Research
Issue number22
Publication statusPublished - Nov 25 1985


ASJC Scopus subject areas

  • Statistics, Probability and Uncertainty
  • Applied Mathematics
  • Health, Toxicology and Mutagenesis
  • Toxicology
  • Genetics(clinical)
  • Genetics

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