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. 1987 Nov;7(11):4125–4129. doi: 10.1128/mcb.7.11.4125

Negative and positive regulation by a short segment in the 5'-flanking region of the human cytomegalovirus major immediate-early gene.

J A Nelson 1, C Reynolds-Kohler 1, B A Smith 1
PMCID: PMC368085  PMID: 2828927

Abstract

To analyze the significance of inducible DNase I-hypersensitive sites occurring in the 5'-flanking sequence of the major immediate-early gene of human cytomegalovirus (HCMV), various deleted portions of the HCMV immediate-early promoter regulatory region were attached to the chloramphenicol acetyltransferase (CAT) gene and assayed for activity in transiently transfected undifferentiated and differentiated human teratocarcinoma cells, Tera-2. Assays of progressive deletions in the promoter regulatory region indicated that removal of a 395-base-pair portion of this element (nucleotides -750 to -1145) containing two inducible DNase I sites which correlate with gene expression resulted in a 7.5-fold increase in CAT activity in undifferentiated cells. However, in permissive differentiated Tera-2, human foreskin fibroblast, and HeLa cells, removal of this regulatory region resulted in decreased activity. In addition, attachment of this HCMV upstream element to a homologous or heterologous promoter increased activity three- to fivefold in permissive cells. Therefore, a cis regulatory element exists 5' to the enhancer of the major immediate-early gene of HCMV. This element negative modulates expression in nonpermissive cells but positively influences expression in permissive cells.

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Selected References

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