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Global characterization of transcriptional impact of the SRC-3 coregulator.

Authors
  • Lanz, Rainer B
  • Bulynko, Yaroslava
  • Malovannaya, Anna
  • Labhart, Paul
  • Wang, Liguo
  • Li, Wei
  • Qin, Jun
  • Harper, Mary
  • O'Malley, Bert W
Type
Published Article
Journal
Molecular Endocrinology
Publisher
The Endocrine Society
Publication Date
Apr 01, 2010
Volume
24
Issue
4
Pages
859–872
Identifiers
DOI: 10.1210/me.2009-0499
PMID: 20181721
Source
Medline
License
Unknown

Abstract

The nuclear receptor and bona fide oncogene, steroid receptor coactivator-3 (SRC-3, AIB1), acts as a master transcriptional regulator of breast cancer by transducing growth signals via the estrogen receptor alpha (ER). In this resource paper, we present the genome-wide localization analysis of SRC-3 chromatin affinity sites in MCF-7 human breast cancer chromatin and compare the cis binding sites to global cartographies for ER and FoxA1. By correlating their gene proximal binding sites to integrated gene expression signatures, and in combination with gene ontology analyses, we provide a functional classification of estradiol-induced gene regulation that further highlights an intricate transcriptional control of interdependent cellular pathways by SRC-3. Furthermore, by presenting proteomics analyses of in vivo SRC-3- and ER-associated proteins, we give strong evidence to support the idea that the interpretative power of SRC-3 in estrogen signaling is mediated through the formation of distinct, cell state-dependent protein complexes. Altogether, we present the first approach in complementary comparative analyses that converges results obtained by three discovery-driven methods (cistromics, transcriptomics, and proteomics) into testable hypotheses, thus providing a valuable resource for follow-up studies that further our understanding of estrogen signaling in human diseases in general and breast cancer in particular.

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