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Progesterone (P4) signaling through its nuclear transcription factor, the progesterone receptor (PR), is essential for normal uterine function. Although deregulation of PR-mediated signaling is known to underscore uterine dysfunction and a number of endometrial pathologies, the early molecular mechanisms of this deregulation are unclear. To address this issue, we have defined the genome-wide PR cistrome in the murine uterus using chromatin immunoprecipitation (ChIP) followed by massively parallel sequencing (ChIP-seq). In uteri of ovariectomized mice, we identified 6367 PR-binding sites in the absence of P4 ligand; however, this number increased at nearly 3-fold (18,432) after acute P4 exposure. Sequence analysis revealed that approximately 73% of these binding sites contain a progesterone response element or a half-site motif recognized by the PR. Many previously identified P4 target genes known to regulate uterine function were found to contain PR-binding sites, confirming the validity of our methodology. Interestingly, when the ChIP-seq data were coupled with our microarray expression data, we identified a novel regulatory role for uterine P4 in circadian rhythm gene expression, thereby uncovering a hitherto unexpected new circadian biology for P4 in this tissue. Further mining of the ChIP-seq data revealed Sox17 as a direct transcriptional PR target gene in the uterus. As a member of the Sox transcription factor family, Sox17 represents a potentially novel mediator of PR action in the murine uterus. Collectively, our first line of analysis of the uterine PR cistrome provides the first insights into the early molecular mechanisms that underpin normal uterine responsiveness to acute P4 exposure. Future analysis promises to reveal the PR interactome and, in turn, potential therapeutic targets for the diagnosis and/or treatment of endometrial dysfunction.

Research Resource: Genome-Wide Profiling of Progesterone Receptor Binding in the Mouse Uterus