A CREB Site in the BRCA1 Proximal Promoter Acts As a Constitutive Transcriptional Element

Overview

Journal Oncogene

Specialties Molecular Biology
Oncology

Date 2001 Nov 13

PMID 11704836

Citations 21

Authors

E Atlas

M Stramwasser

C R Mueller

Affiliations

Soon will be listed here.

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.

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