Related Experiment Video
Updated: Aug 18, 2026

Methods to Discover Alternative Promoter Usage and Transcriptional Regulation of Murine Bcrp1
Published on: May 27, 2016
A CREB site in the BRCA1 proximal promoter acts as a constitutive transcriptional element
E Atlas1, M Stramwasser, C R Mueller
1Cancer Research Laboratories, Department of Biochemistry, Queen's University, Kingston, Ontario, Canada.
Abstract:
Transcriptional regulation of the BRCA1 proximal promoter has been suggested to play a role in the decreased expression of BRCA1 observed in sporadic breast cancer. Computer analysis of the sequence of the proximal promoter reveals the presence of a potential CREB site. We have identified CREB/ATF-1 as the factor interacting with this site in nuclear extracts from MCF-7 and T-47D cells. This site is shown to be important for the constitutive expression of the promoter in these cells, as well as in Hep G2 cells. Despite the presence of this site, the BRCA1 promoter is not responsive to cAMP induction. It appears that CREB acts as a constitutive positive element for BRCA1 expression and that any mechanism inactivating CREB function would have a dramatic effect on BRCA1 expression.
More Related Videos
Related Concept Videos
RNA Polymerase II Accessory Proteins
Cis-regulatory Sequences
The Eukaryotic Promoter Region
Co-activators and Co-repressors
The Eukaryotic Promoter Region
Co-activators and Co-repressors

