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H3K4 acetylation, H3K9 acetylation and H3K27 methylation in breast tumor molecular subtypes
Judes G et al.
Here, we investigated how the St Gallen breast molecular subtypes displayed distinct histone H3 profiles.
PATIENTS & METHODS:
192 breast tumors divided into five St Gallen molecular subtypes (luminal A, luminal B HER2-, luminal B HER2+, HER2+ and basal-like) were evaluated for their histone H3 modifica...
Premalignant SOX2 overexpression in the fallopian tubes of ovarian cancer patients: Discovery and validation studies
Hellner K et al.
Current screening methods for ovarian cancer can only detect advanced disease. Earlier detection has proved difficult because the molecular precursors involved in the natural history of the disease are unknown. To identify early driver mutations in ovarian cancer cells, we used dense whole genome sequencing of micro...
MicroRNAs of the miR-290-295 Family Maintain Bivalency in Mouse Embryonic Stem Cells
Graham B et al.
Numerous developmentally regulated genes in mouse embryonic stem cells (ESCs) are marked by both active (H3K4me3)- and polycomb group (PcG)-mediated repressive (H3K27me3) histone modifications. This bivalent state is thought to be important for transcriptional poising, but the mechanisms that regulate bivalent genes...
BRCA1 positively regulates FOXO3 expression by restricting FOXO3 gene methylation and epigenetic silencing through targeting EZH2 in breast cancer
C Gong, S Yao, A R Gomes, E P S Man, H J Lee, G Gong, S Chang, S-B Kim, K Fujino, S-W Kim, S K Park, J W Lee, M H Lee, KOHBRA study group, U S Khoo and E W-F Lam
BRCA1 mutation or depletion correlates with basal-like phenotype and poor prognosis in breast cancer but the underlying reason remains elusive. RNA and protein analysis of a panel of breast cancer cell lines revealed that BRCA1 deficiency is associated with downregulation of the expression of the pleiotropic tumour ...
The JMJD3 Histone Demethylase and the EZH2 Histone Methyltransferase in Prostate Cancer
Daures M, Ngollo M, Judes G, Rifaï K, Kemeny JL, Penault-Llorca F, Bignon YJ, Guy L, Bernard-Gallon D
Prostate cancer is themost common cancer in men. It has been clearly established that genetic and epigenetic alterations of histone 3 lysine 27 trimethylation (H3K27me3) are common events in prostate cancer. This mark is deregulated in prostate cancer (Ngollo et al., 2014). Furthermore, H3K27me3 levels are determine...
Spatial Interplay between Polycomb and Trithorax Complexes Controls Transcriptional Activity in T Lymphocytes
Onodera A, Tumes DJ, Watanabe Y, Hirahara K, Kaneda A, Sugiyama F, Suzuki Y, Nakayama T
Trithorax group (TrxG) and Polycomb group (PcG) proteins are two mutually antagonistic chromatin modifying complexes, however, how they together mediate transcriptional counter-regulation remains unknown. Genome-wide analysis revealed that binding of Ezh2 and menin, central members of the PcG and TrxG complexes, res...
Loss of EZH2 results in precocious mammary gland development and activation of STAT5-dependent genes
Yoo KH, Oh S, Kang K, Hensel T, Robinson GW, Hennighausen L
Establishment and differentiation of mammary alveoli during pregnancy are controlled by prolactin through the transcription factors STAT5A and STAT5B (STAT5), which also regulate temporal activation of mammary signature genes. This study addressed the question whether the methyltransferase and transcriptional co-act...
Polycomb repressive complex PRC1 spatially constrains the mouse embryonic stem cell genome
Schoenfelder S et al.
The Polycomb repressive complexes PRC1 and PRC2 maintain embryonic stem cell (ESC) pluripotency by silencing lineage-specifying developmental regulator genes. Emerging evidence suggests that Polycomb complexes act through controlling spatial genome organization. We show that PRC1 functions as a master regulator of m...
H19 lncRNA controls gene expression of the Imprinted Gene Network by recruiting MBD1.
Monnier P, Martinet C, Pontis J, Stancheva I, Ait-Si-Ali S, Dandolo L
The H19 gene controls the expression of several genes within the Imprinted Gene Network (IGN), involved in growth control of the embryo. However, the underlying mechanisms of this control remain elusive. Here, we identified the methyl-CpG-binding domain protein 1 MBD1 as a physical and functional partner of the H19 ...
A key role for EZH2 in epigenetic silencing of HOX genes in mantle cell lymphoma.
Kanduri M, Sander B, Ntoufa S, Papakonstantinou N, Sutton LA, Stamatopoulos K, Kanduri C, Rosenquist R
The chromatin modifier EZH2 is overexpressed and associated with inferior outcome in mantle cell lymphoma (MCL). Recently, we demonstrated preferential DNA methylation of HOX genes in MCL compared with chronic lymphocytic leukemia (CLL), despite these genes not being expressed in either entity. Since EZH2 has been s...
The polycomb protein Ezh2 regulates differentiation and plasticity of CD4(+) T helper type 1 and type 2 cells.
Tumes DJ, Onodera A, Suzuki A, Shinoda K, Endo Y, Iwamura C, Hosokawa H, Koseki H, Tokoyoda K, Suzuki Y, Motohashi S, Nakayama T
After antigen encounter by CD4(+) T cells, polarizing cytokines induce the expression of master regulators that control differentiation. Inactivation of the histone methyltransferase Ezh2 was found to specifically enhance T helper 1 (Th1) and Th2 cell differentiation and plasticity. Ezh2 directly bound and facilitat...
Histone lysine trimethylation or acetylation can be modulated by phytoestrogen, estrogen or anti-HDAC in breast cancer cell lines.
Dagdemir A, Durif J, Ngollo M, Bignon YJ, Bernard-Gallon D
AIM: The isoflavones genistein, daidzein and equol (daidzein metabolite) have been reported to interact with epigenetic modifications, specifically hypermethylation of tumor suppressor genes. The objective of this study was to analyze and understand the mechanisms by which phytoestrogens act on chromatin in breast c...
Dynamic Changes in Ezh2 Gene Occupancy Underlie Its Involvement in Neural Stem Cell Self-Renewal and Differentiation towards Oligodendrocytes
Sher F, Boddeke E, Olah M, Copray S
Background: The polycomb group protein Ezh2 is an epigenetic repressor of transcription originally found to prevent untimely differentiation of pluripotent embryonic stem cells. We previously demonstrated that Ezh2 is also expressed in multipotent neural stem cells (NSCs). We showed that Ezh2 expression is downregul...
RYBP-PRC1 Complexes Mediate H2A Ubiquitylation at Polycomb Target Sites Independently of PRC2 and H3K27me3.
Tavares L, Dimitrova E, Oxley D, Webster J, Poot R, Demmers J, Bezstarosti K, Taylor S, Ura H, Koide H, Wutz A, Vidal M, Elderkin S, Brockdorff N
Polycomb-repressive complex 1 (PRC1) has a central role in the regulation of heritable gene silencing during differentiation and development. PRC1 recruitment is generally attributed to interaction of the chromodomain of the core protein Polycomb with trimethyl histone H3K27 (H3K27me3), catalyzed by a second complex...
PcG complexes set the stage for epigenetic inheritance of gene silencing in early S phase before replication.
Lanzuolo C, Lo Sardo F, Diamantini A, Orlando V
Polycomb group (PcG) proteins are part of a conserved cell memory system that conveys epigenetic inheritance of silenced transcriptional states through cell division. Despite the considerable amount of information about PcG mechanisms controlling gene silencing, how PcG proteins maintain repressive chromatin during ...
Silencing of Kruppel-like factor 2 by the histone methyltransferase EZH2 in human cancer.
Taniguchi H, Jacinto FV, Villanueva A, Fernandez AF, Yamamoto H, Carmona FJ, Puertas S, Marquez VE, Shinomura Y, Imai K, Esteller M
The Kruppel-like factor (KLF) proteins are multitasked transcriptional regulators with an expanding tumor suppressor function. KLF2 is one of the prominent members of the family because of its diminished expression in malignancies and its growth-inhibitory, pro-apoptotic and anti-angiogenic roles. In this study, we ...
Enhancer of Zeste 2 (EZH2) is up-regulated in malignant gliomas and in glioma stem-like cells.
Orzan F, Pellegatta S, Poliani PL, Pisati F, Caldera V, Menghi F, Kapetis D, Marras C, Schiffer D, Finocchiaro G
AIMS: Proteins of the Polycomb repressive complex 2 (PRC2) are epigenetic gene silencers and are involved in tumour development. Their oncogenic function might be associated with their role in stem cell maintenance. The histone methyltransferase Enhancer of Zeste 2 (EZH2) is a key member of PRC2 function: we have in...
Promoter-exon relationship of H3 lysine 9, 27, 36 and 79 methylation on pluripotency-associated genes.
Barrand S, Andersen IS, Collas P
Evidence links pluripotency to a gene regulatory network organized by the transcription factors Oct4, Nanog and Sox2. Expression of these genes is controlled by epigenetic modifications on regulatory regions. However, little is known on profiles of trimethylated H3 lysine residues on coding regions of these genes in...