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Updated: Aug 8, 2026

Prediction and Validation of Gene Regulatory Elements Activated During Retinoic Acid Induced Embryonic Stem Cell Differentiation
Published on: June 21, 2016
Stimulation of in vitro transcription from the SV40 early promoter by the enhancer involves a specific trans-acting
Abstract:
A nuclear extract prepared from HeLa cells has been used to study in vitro the transcription of the SV40 early promoter. The deletion of the enhancer results in a strong decrease of transcription, with spermidine and MgCl2 being critical variables in the transcription reactions. Furthermore a competition assay indicates that the stimulation by the enhancer is due to a specific trans-acting factor(s) which acts on it. This factor appears not to interact with SV40 or adenovirus-2 major late upstream (distal) promoter sequences, and its ability to bind to the enhancer is diminished by mutations known to decrease enhancer function in vivo and in vitro.
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