Abstract
Chimeric SV40 DNA containing only the early region, or plasmid DNA harboring the origin-promoter-enhancer region of SV40, when introduced into CV-1 or Cos-1 monkey cells by DEAE-dextran mediated transfer are rapidly assembled in a typical chromatin structure revealed by the generation of a regular 190 bp repeat ladder after micrococcal nuclease digestion. DNA replication is not required for this assembly process. Chromatin-specific DNase I hypersensitive sites are observed in the enhancer region of these minichromosomes. The pattern of the sites differs between non-replicating and post-replicated chromatin. The latter is identical to that observed in the lytic cycle. The presence of large T antigen is not sufficient for the shift in the structure of the chromatin. These experiments suggest that replication can modulate protein-DNA interactions during viral infection or upon cell differentiation.
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