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Distinct distributions of histone marks shape cell identities of murine hepatic progenitors and adult hepatocytes

ABSTRACT: The present study revealed dynamic reposition of localizations of silencing histone marks including H3K27me3 in hepatocyte differentiation, of which target genes reflect the cell identities in connection to the cellular functions. Our results shed light on the process of hepatocyte terminal differentiation regulated by epigenetic mechanisms. Comparison of gene expression in E13.5 liver cells from WT and Ezh2 KO mice.

ORGANISM(S): Mus musculus

SUBMITTER: Yasuharu Ueno

PROVIDER: E-GEOD-54029 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Ring1B Promotes Hepatic Stem/Progenitor Cell Expansion via Simultaneous Suppression of Cdkn1a and Cdkn2a

Project description:The expansion of hepatic stem/progenitor cells requires Ring1B-mediated epigenetic silencing of Cdkn1a and Cdkn2a, demonstrating that Ring1B simultaneously regulates multiple CDKI in tissue stem/progenitor cells. Comparison of gene expression profiles between Ring1B KO and WT murine liver cells at E13.5

2014-04-01 | E-GEOD-54116 | biostudies-arrayexpress

Loss of EZH2 results in precocious mammary gland development and the activation of STAT5-dependent genes

Project description:Establishment and differentiation of mammary alveoli during pregnancy are controlled by prolactin through the transcription factor STAT5. As pregnancy progresses mammary signature genes are activated in a defined temporal order, which coincides with the recruitment of STAT5 to respective regulatory sequences. This study addressed the question whether the methyltransferase and transcriptional co-activator EZH2 controls the differentiation clock of mammary epithelium. Ablation of Ezh2 from mammary stem cells resulted in precocious differentiation of alveolar epithelium during pregnancy and the activation of mammary-specific STAT5 target genes. This coincided with enhanced occupancy by STAT5, EZH1 and Pol II to these loci. Limited activation of differentiation-specific genes was also observed in mammary epithelium lacking both EZH2 and STAT5, suggesting a modulating but not mandatory role for STAT5. Notably, loss of EZH2 did not result in overt changes in genome-wide and gene-specific H3K27me3 patterns, suggesting that enhanced EZH1 recruitment can compensate for the loss of EZH2. Differentiated mammary epithelia failed to form in the combined absence of EZH1 and EZH2. Transplantation experiments failed to demonstrate a role for EZH2 in the biology of mammary stem and progenitor cells. In summary, while EZH1 and EZH2 serve redundant functions in the establishment of H3K27me3 and formation of mammary alveoli, the presence of EZH2 is required to obtain controlled temporal differentiation of mammary epithelium. mRNA-seq in WT;MMTV-Cre (Control) at p13 and p18, E1-/- (E1KO), Ezh2f/f;MMTV-Cre(E2KO), Stat5f/f;MMTV-Cre(S5KO), and Ezh2f/f;Stat5f/f;MMTV-Cre (E2S5DKO) at p13 mammary tissues. ChIP-seq for H3K27me3, STAT5, EZH1, EZH2 and PolII in mammary tissues at p13

2015-08-31 | E-GEOD-70440 | biostudies-arrayexpress

Continuous expression of the transcription factor E2-2 maintains the cell fate of mature plasmacytoid dendritic cells

Project description:This SuperSeries is composed of the following subset Series: GSE24726: Gene expression profile of mature plasmacytoid dendritic cells (PDC) after the deletion of transcription factor E2-2 GSE24740: Binding targets of transcription factor E2-2 in human plasmacytoid dendritic cells Refer to individual Series

2010-12-21 | E-GEOD-24785 | biostudies-arrayexpress

Gene expression profile of mature plasmacytoid dendritic cells (PDC) after the deletion of transcription factor E2-2

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2010-12-21 | E-GEOD-24726 | biostudies-arrayexpress

Epigenetic repression of cardiac progenitor gene expression by Ezh2 is required for postnatal cardiac homeostasis

Project description:Adult-onset diseases can be associated with in utero events, but mechanisms for such temporally distant dysregulation of organ function remain unknown. The polycomb histone methyltransferase, Ezh2, stabilizes transcription by depositing repressive histone marks during development that persist into adulthood, but the function of Ezh2-mediated transcriptional stability in postnatal organ homeostasis is not understood. Here, we show that Ezh2 stabilizes the postnatal cardiac gene expression program and prevents cardiac pathology, primarily by repressing the homeodomain transcription factor Six1 in differentiating cardiac progenitors. Loss of Ezh2 in embryonic cardiac progenitors, but not in differentiated cardiomyocytes, resulted in postnatal cardiac pathology, including cardiomyocyte hypertrophy and fibrosis. Loss of Ezh2 caused broad derepression of skeletal muscle genes, including the homeodomain transcription factor Six1, which is expressed in cardiac progenitors but is normally silenced upon cardiac differentiation. Many of the deregulated genes are direct Six1 targets, implying a critical requirement for stable repression of Six1 in cardiac myocytes. Indeed, upon de-repression, Six1 promotes cardiac pathology, as it was sufficient to induce cardiac hypertrophy. Furthermore, genetic reduction of Six1 levels almost completely rescued the pathology of Ezh2-deficient hearts. Thus, repression of a single transcription factor in cardiac progenitors by Ezh2 is essential for stability of the adult heart gene expression program and homeostasis. Our results suggest that epigenetic dysregulation during discrete developmental windows can predispose to adult disease and dysregulated stress responses. Global gene expression profiles of Ezh2-deficient hearts. The right ventricle and the interventricular septum of five wild type (Ezh2f/f) and four Ezh2-deficient (Ezh2f/f;Mef2cAHF::Cre) mice were analyzed.

2011-12-31 | E-GEOD-30076 | biostudies-arrayexpress

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Project description:Establishment and differentiation of mammary alveoli during pregnancy are controlled by prolactin through the transcription factor STAT5. As pregnancy progresses mammary signature genes are activated in a defined temporal order, which coincides with the recruitment of STAT5 to respective regulatory sequences. This study addressed the question whether the methyltransferase and transcriptional co-activator EZH2 controls the differentiation clock of mammary epithelium. Ablation of Ezh2 from mammary stem cells resulted in precocious differentiation of alveolar epithelium and accelerated activation of mammary signature genes. This coincided with enhanced occupancy by EZH1, Pol II and STAT5 to mammary-specific loci. Notably, loss of EZH2 did not result in overt changes in genome-wide and gene-specific H3K27me3 patterns, suggesting that enhanced EZH1 recruitment can compensate for the loss of EZH2. However, differentiated mammary epithelia failed to form in the combined absence of EZH1 and EZH2. Transplantation experiments failed to demonstrate a role for EZH2 in the biology of mammary stem and progenitor cells. In summary, while EZH1 and EZH2 serve redundant functions in the establishment of H3K27me3 and formation of mammary alveoli, the presence of EZH2 is required to obtain controlled temporal differentiation of mammary epithelium. ChIP-seq EZH1, EZH2, PolIII; WT and E2KO mammary cells

2015-01-27 | E-GEOD-65284 | biostudies-arrayexpress

Timecourse analysis of Ezh2-dependent gene expression by SVZ NSCs during differentiation

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2014-05-02 | E-GEOD-56988 | biostudies-arrayexpress

Loss of EZH2 results in enhanced recruitment of EZH1, Pol II and Stat5 and precocious mammary gland development (SuperSeries)

Project description:This SuperSeries is composed of the SubSeries listed below. Refer to individual Series

2015-01-27 | E-GEOD-65285 | biostudies-arrayexpress

Expression data during plantaris muscle hypertrophy with/without satellite cells induced by synergist ablation in young adult Pax7-DTA mice

Project description:Global gene expression patterns were determined from microarray results from sham surgery or following 1 week of plantaris muscle hypertrophy induced by synergist ablation in young adult Pax7-DTA mice (4 months). Vehicle treated mice have their full complement of satellite cells; tamoxifen treated mice have had their satellite cells genetically depleted through Cre-loxP technology After sham surgery or 1 week of overload, Affymetrix chips (mouse430_2.0) were used with 1 Âµg of total RNA derived from a pooled sample of the right and left plantaris muscles from 11 animals.

2014-02-20 | E-GEOD-52597 | biostudies-arrayexpress

Origins of MLL cancer stem cells govern leukemic self-renewal mediated by -catenin and Hoxa9

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