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Molecular and Cellular Biology, July 2007, p. 5090-5104, Vol. 27, No. 14
0270-7306/07/$08.00+0     doi:10.1128/MCB.00083-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.

Genomic Analyses of Transcription Factor Binding, Histone Acetylation, and Gene Expression Reveal Mechanistically Distinct Classes of Estrogen-Regulated Promoters{triangledown}

Miltiadis Kininis,1,2 Benjamin S. Chen,1 Adam G. Diehl,1,2 Gary D. Isaacs,1,3 Tong Zhang,1 Adam C. Siepel,4 Andrew G. Clark,1,2 and W. Lee Kraus1,2,3,5*

Department of Molecular Biology and Genetics, Cornell University, Ithaca, New York 14853,1 Field of Genetics and Development, Cornell University, Ithaca, New York 14853,2 Field of Biochemistry, Molecular and Cell Biology, Cornell University, Ithaca, New York 14853,3 Department of Biological Statistics and Computational Biology, Cornell University, Ithaca, New York 14853,4 Department of Pharmacology, Weill Medical College of Cornell University, New York, New York 100215

Received 15 January 2007/ Returned for modification 20 February 2007/ Accepted 8 May 2007

To explore the global mechanisms of estrogen-regulated transcription, we used chromatin immunoprecipitation coupled with DNA microarrays to determine the localization of RNA polymerase II (Pol II), estrogen receptor alpha (ER{alpha}), steroid receptor coactivator proteins (SRC), and acetylated histones H3/H4 (AcH) at estrogen-regulated promoters in MCF-7 cells with or without estradiol (E2) treatment. In addition, we correlated factor occupancy with gene expression and the presence of transcription factor binding elements. Using this integrative approach, we defined a set of 58 direct E2 target genes based on E2-regulated Pol II occupancy and classified their promoters based on factor binding, histone modification, and transcriptional output. Many of these direct E2 target genes exhibit interesting modes of regulation and biological activities, some of which may be relevant to the onset and proliferation of breast cancers. Our studies indicate that about one-third of these direct E2 target genes contain promoter-proximal ER{alpha}-binding sites, which is considerably more than previous estimates. Some of these genes represent possible novel targets for regulation through the ER{alpha}/AP-1 tethering pathway. Our studies have also revealed several previously uncharacterized global features of E2-regulated gene expression, including strong positive correlations between Pol II occupancy and AcH levels, as well as between the E2-dependent recruitment of ER{alpha} and SRC at the promoters of E2-stimulated genes. Furthermore, our studies have revealed new mechanistic insights into E2-regulated gene expression, including the absence of SRC binding at E2-repressed genes and the presence of constitutively bound, promoter-proximally paused Pol IIs at some E2-regulated promoters. These mechanistic insights are likely to be relevant for understanding gene regulation by a wide variety of nuclear receptors.

* Corresponding author. Mailing address: Department of Molecular Biology and Genetics, Cornell University, 465 Biotechnology Building, Ithaca, NY 14853. Phone: (607) 255-6087. Fax: (607) 255-6249. E-mail: wlk5{at}cornell.edu

{triangledown} Published ahead of print on 21 May 2007.

Molecular and Cellular Biology, July 2007, p. 5090-5104, Vol. 27, No. 14
0270-7306/07/$08.00+0     doi:10.1128/MCB.00083-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.



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