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Open Access Research

Genome-wide mapping of FOXM1 binding reveals co-binding with estrogen receptor alpha in breast cancer cells

Deborah A Sanders1, Caryn S Ross-Innes1, Dario Beraldi1, Jason S Carroll12* and Shankar Balasubramanian134*

Author affiliations

1 Cancer Research UK, Cambridge Research Institute, Li Ka Shing Centre, Robinson Way, Cambridge, CB2 0RE, UK

2 Department of Oncology, University of Cambridge, Cambridge, CB2 0RE, UK

3 Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK

4 School of Clinical Medicine, The University of Cambridge, Addenbrooke's Hospital, Hills Road, Cambridge CB2 0SP, UK

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Citation and License

Genome Biology 2013, 14:R6  doi:10.1186/gb-2013-14-1-r6

Published: 24 January 2013

Abstract

Background

The forkhead transcription factor FOXM1 is a key regulator of the cell cycle. It is frequently over-expressed in cancer and is emerging as an important therapeutic target. In breast cancer FOXM1 expression is linked with estrogen receptor (ERα) activity and resistance to endocrine therapies, with high levels correlated with poor prognosis. However, the precise role of FOXM1 in ER positive breast cancer is not yet fully understood.

Results

The study utilizes chromatin immunoprecipitation followed by high-throughput sequencing to map FOXM1 binding in both ERα-positive and -negative breast cancer cell lines. The comparison between binding site distributions in the two cell lines uncovered a previously undescribed relationship between binding of FOXM1 and ERα. Further molecular analyses demonstrated that these two factors can bind simultaneously at genomic sites and furthermore that FOXM1 regulates the transcriptional activity of ERα via interaction with the coactivator CARM1. Inhibition of FOXM1 activity using the natural product thiostrepton revealed down-regulation of a set of FOXM1-regulated genes that are correlated with patient outcome in clinical breast cancer samples.

Conclusions

These findings reveal a novel role for FOXM1 in ERα transcriptional activity in breast cancer and uncover a FOXM1-regulated gene signature associated with ER-positive breast cancer patient prognosis.