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Learn MoreEstrogen hormones are implicated in a majority of breast cancers and estrogen receptor alpha (ER) orchestrates a complex molecular circuitry that is not yet fully elucidated. Here we investigated genome-wide DNA methylation, histone acetylation and transcription after estradiol (E2) deprivation and re-stimulation to better characterise the ability of ER to coordinate gene regulation. We found that E2 deprivation mostly resulted in DNA hypermethylation and histone deacetylation in enhancers. Transcriptome analysis revealed that E2 deprivation leads to a global down-regulation in gene expression. Enrichment analysis of transcription factor (TF) binding and motif occurrence in the proximity of E2 deprivation-mediated differentially methylated and acetylated sites reinforces the importance of AP-1 and FOX proteins, Finally, most deprivation-dependent epigenetic changes were reversed following E2 re-stimulation. SOURCE: Zdenko Herceg (HercegZ@iarc.fr) - Epigenetics IARC
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