Global Changes in the Mammary Epigenome Are Induced by Hormonal Cues and Coordinated by Ezh2
Details
Publication Year 2013-02, Volume 3, Issue #2, Page 411-426
Journal Title
CELL REPORTS
Publication Type
Journal Article
Abstract
The mammary epithelium is a dynamic, highly hormone-responsive tissue. To explore chromatin modifications underlying its lineage specification and hormone responsiveness, we determined genomewide histone methylation profiles of mammary epithelial subpopulations in different states. The marked differences in H3K27 trimethylation between subpopulations in the adult gland suggest that epithelial cell-fate decisions are orchestrated by polycomb-complex-mediated repression. Remarkably, the mammary epigenome underwent highly specific changes in different hormonal contexts, with a profound change being observed in the global H3K27me3 map of luminal cells during pregnancy. We therefore examined the role of the key H3K27 methyltransferase Ezh2 in mammary physiology. Its expression and phosphorylation coincided with H3K27me3 modifications and peaked during pregnancy, driven in part by progesterone. Targeted deletion of Ezh2 impaired alveologenesis during pregnancy, preventing lactation, and drastically reduced stem/progenitor cell numbers. Taken together, these findings reveal that Ezh2 couples hormonal stimuli to epigenetic changes that underpin progenitor activity, lineage specificity, and alveolar expansion in the mammary gland.
Publisher
CELL PRESS
Keywords
ESTROGEN-RECEPTOR-ALPHA; BREAST EPITHELIAL-CELLS; GENOME-WIDE MAPS; STEM-CELLS; GLAND DEVELOPMENT; PROGESTERONE-RECEPTOR; GENE-EXPRESSION; METHYLTRANSFERASE EZH2; COMMITTED CELLS; MICE LACKING
WEHI Research Division(s)
Stem Cells And Cancer; Bioinformatics
Rights Notice
Copyright © 2013 The Authors. Published by Elsevier Inc. All rights reserved.


Creation Date: 2013-02-01 12:00:00
Last Modified: 0001-01-01 12:00:00
An error has occurred. This application may no longer respond until reloaded. Reload 🗙