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H3K4me3

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https://www.readbyqxmd.com/read/29233856/structure-of-the-arabidopsis-jmj14-h3k4me3-complex-provides-insight-into-the-substrate-specificity-of-kdm5-subfamily-histone-demethylases
#1
Zhenlin Yang, Qi Qiu, Wei Chen, Bei Jia, Xiaomei Chen, Hongmiao Hu, Kaixuan He, Xian Deng, Sisi Li, W Andy Tao, XiaoFeng Cao, Jiamu Du
In chromatin, histone methylation affects the epigenetic regulation of multiple processes in animals and plants and is modulated by the activities of histone methyltransferases and histone demethylases. The jumonji domain-containing histone demethylases have diverse functions and can be classified into several subfamilies. In humans, the jumonji domain-containing Lysine (K)-Specific Demethylase 5/Jumonji and ARID Domain Protein (KDM5/JARID) subfamily demethylases are specific for histone 3 lysine 4 trimethylation (H3K4me3) and are important drug targets for cancer treatment...
December 12, 2017: Plant Cell
https://www.readbyqxmd.com/read/29233090/dna-methylation-regulates-discrimination-of-enhancers-from-promoters-through-a-h3k4me1-h3k4me3-seesaw-mechanism
#2
Ali Sharifi-Zarchi, Daniela Gerovska, Kenjiro Adachi, Mehdi Totonchi, Hamid Pezeshk, Ryan J Taft, Hans R Schöler, Hamidreza Chitsaz, Mehdi Sadeghi, Hossein Baharvand, Marcos J Araúzo-Bravo
BACKGROUND: DNA methylation at promoters is largely correlated with inhibition of gene expression. However, the role of DNA methylation at enhancers is not fully understood, although a crosstalk with chromatin marks is expected. Actually, there exist contradictory reports about positive and negative correlations between DNA methylation and H3K4me1, a chromatin hallmark of enhancers. RESULTS: We investigated the relationship between DNA methylation and active chromatin marks through genome-wide correlations, and found anti-correlation between H3K4me1 and H3K4me3 enrichment at low and intermediate DNA methylation loci...
December 12, 2017: BMC Genomics
https://www.readbyqxmd.com/read/29222089/core-binding-factor-%C3%AE-and-runx-transcription-factors-promote-adaptive-natural-killer-cell-responses
#3
Moritz Rapp, Colleen M Lau, Nicholas M Adams, Orr-El Weizman, Timothy E O'Sullivan, Clair D Geary, Joseph C Sun
Natural killer (NK) cells are innate lymphocytes that have features of adaptive immunity such as clonal expansion and generation of long-lived memory. Interleukin-12 (IL-12) signaling through its downstream transcription factor signal transducer and activator of transcription 4 (STAT4) is required for the generation of memory NK cells after expansion. We identify gene loci that are highly enriched for STAT4 binding using chromatin immunoprecipitation sequencing for STAT4 and the permissive histone mark H3K4me3 in activated NK cells...
December 8, 2017: Science Immunology
https://www.readbyqxmd.com/read/29205617/epigenetic-states-of-donor-cells-significantly-affect-the-development-of-somatic-cell-nuclear-transfer-scnt-embryos-in-pigs
#4
Yanhui Zhai, Wei Li, Zhiren Zhang, Yunqing Cao, Zhengzhu Wang, Sheng Zhang, Ziyi Li
The type and pattern of epigenetic modification in donor cells can significantly affect the developmental competency of somatic cell nuclear transfer (SCNT) embryos. Here, we investigated the developmental capacity, gene expression, and epigenetic modifications of SCNT embryos derived from porcine bone marrow-derived mesenchymal stem cells (BMSCs) and fetal fibroblasts (FFs) donor cells compared to embryos obtained from in vitro fertilization (IVF). Compared to FFs, the donor BMSCs had more active epigenetic markers (Histone H3 modifications: H3K9Ac, H3K4me3, and H3K4me2) and fewer repressive epigenetic markers (H3K9me3, H3K9me2, and DNA methyltransferase 1)...
December 4, 2017: Molecular Reproduction and Development
https://www.readbyqxmd.com/read/29203199/overexpression-of-oct4-induced-by-modulation-of-histone-marks-plays-crucial-role-in-breast-cancer-progression
#5
Swayamsiddha Kar, Samir Kumar Patra
OCT4 is known as the gatekeeper of pluripotent embryonic state as it is responsible for maintenance of pluripotency via self-renewal of embryonic stem cells and acquisition of induced pluripotency via somatic cell reprogramming. OCT4 is responsible for oncogenic transformation by disrupting pre-scheduled differentiation programs and in general, favoring evolution of cancer cells into a more aggressive cancer stem cell phenotype. In this study, we have investigated in details, the epigenetic regulatory mechanisms responsible for over-expression and subsequent aberrant function of OCT4 in breast cancer...
December 1, 2017: Gene
https://www.readbyqxmd.com/read/29195162/effects-of-adolescent-social-stress-and-antidepressant-treatment-on-cognitive-inflexibility-and-bdnf-epigenetic-modifications-in-the-mpfc-of-adult-mice
#6
Hang Xu, Jiesi Wang, Ke Zhang, Mei Zhao, Bart Ellenbroek, Feng Shao, Weiwen Wang
Adolescent social stress (ASS) can increase susceptibility to depression in adulthood. However, the underlying psychological and neural mechanisms remain unclear. Cortically mediated cognitive dysfunctions are increasingly recognized as an independent and important risk factor of depression. Using social defeat stress, a classical animal model of depression, our previous studies found that mice subjected to this form of stress during early adolescence displayed cognitive inflexibility (CI) in adulthood. This change was accompanied by a down-regulation of Bdnf gene expression in the medial prefrontal cortex (mPFC); this gene encodes a key molecule involved in depression and antidepressant action...
November 26, 2017: Psychoneuroendocrinology
https://www.readbyqxmd.com/read/29187567/linking-phytochrome-interacting-factor-to-histone-modification-in-plant-shade-avoidance
#7
Maolin Peng, Zepeng Li, Nana Zhou, Mengmeng Ma, Yupei Jiang, Aiwu Dong, Wen-Hui Shen, Lin Li
Shade avoidance syndrome (SAS) allows a plant grown in densely populated environment to maximize opportunities to access to sunlight. While it is well established that SAS is accompanied by gene expression changes, the underlying molecular mechanism needs to be elucidated. Here, we identify the H3K4me3/H3K36me3-binding proteins, Morf Related Gene (MRG) group proteins MRG1 and MRG2, as positive regulators of shade-induced hypocotyl elongation in Arabidopsis thaliana. MRG2 binds PHYTOCHROME- INTERACTING FACTOR 7 (PIF7) and regulates the expression of several common downstream target genes, including YUCCA8 and IAA19 involved in the auxin biosynthesis or response pathway and PRE1 involved in brassinosteroid regulation of cell elongation...
November 29, 2017: Plant Physiology
https://www.readbyqxmd.com/read/29186571/oxygen-gradients-can-determine-epigenetic-asymmetry-and-cellular-differentiation-via-differential-regulation-of-tet-activity-in-embryonic-stem-cells
#8
Simon Burr, Anna Caldwell, Mei Chong, Matteo Beretta, Stephen Metcalf, Matthew Hancock, Matthew Arno, Sucharitha Balu, Valeria Leon Kropf, Rajesh K Mistry, Ajay M Shah, Giovanni E Mann, Alison C Brewer
Graded levels of molecular oxygen (O2) exist within developing mammalian embryos and can differentially regulate cellular specification pathways. During differentiation, cells acquire distinct epigenetic landscapes, which determine their function, however the mechanisms which regulate this are poorly understood. The demethylation of 5-methylcytosine (5mC) is achieved via successive oxidation reactions catalysed by the Ten-Eleven-Translocation (Tet) enzymes, yielding the 5-hydroxymethylcytosine (5hmC) intermediate...
November 24, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/29175474/enhanced-h3k4me3-modifications-are-involved-in-the-transactivation-of-dna-damage-responsive-genes-in-workers-exposed-to-low-level-benzene
#9
Jie Li, Xiumei Xing, Xinjie Zhang, Boxuan Liang, Zhini He, Chen Gao, Shan Wang, Fangping Wang, Haiyan Zhang, Shan Zeng, Junling Fan, Liping Chen, Zhengbao Zhang, Bo Zhang, Caixia Liu, Qing Wang, Weiwei Lin, Guanghui Dong, Huanwen Tang, Wen Chen, Yongmei Xiao, Daochuan Li
In this study, we explore whether altered global histone modifications respond to low-level benzene exposure as well as their association with the hematotoxicity. We recruited 147 low-level benzene-exposed workers and 122 control workers from a petrochemical factory in Maoming City, Guangdong Province, China. The internal exposure marker level, urinary S-phenylmercapturic acid (SPMA), in benzene-exposed workers was 1.81-fold higher than that of the controls (P < 0.001). ELISA method was established to examine the specific histone modifications in human peripheral blood lymphocytes (PBLCs) of workers...
November 22, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29174863/adolescent-environmental-enrichment-prevents-the-emergence-of-schizophrenia-like-abnormalities-in-a-neurodevelopmental-model-of-schizophrenia
#10
Ewelina Bator, Joachim Latusz, Krzysztof Wędzony, Marzena Maćkowiak
In the present study, we investigated whether exposure to an enriched environment (EE) during adolescence might affect the behavioural dysfunction (sensorimotor gating deficit, memory and social interaction impairments) and neurochemical changes (GAD67 expression, histone methylation) induced by methylazoxymethanol (MAM) in the MAM-E17 rat model of schizophrenia. EE was introduced for 7 days in early adolescence (days 23-29), and behavioural and biochemical studies were performed on adult rats at postnatal day 70...
November 22, 2017: European Neuropsychopharmacology: the Journal of the European College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/29171124/kdm6a-promotes-chondrogenic-differentiation-of-periodontal-ligament-stem-cells-by-demethylation-of-sox9
#11
Pingting Wang, Yanjing Li, Tingting Meng, Junjiang Zhang, Yuanyuan Wei, Zhaosong Meng, Yunfeng Lin, Dayong Liu, Lei Sui
OBJECTIVES: KDM6A has been demonstrated critical in the regulation of cell fates. However, whether KDM6A is involved in cartilage formation remains unclear. In this study, we investigated the role of KDM6A in chondrogenic differentiation of PDLSCs, as well as the underlying epigenetic mechanisms. METHODS: KDM6A shRNA was transfected into PDLSCs by lentivirus. The chondrogenic differentiation potential of PDLSCs was assessed by Alcian blue staining. Immunofluorescence was performed to demonstrate H3K27me3 and H3K4me3 levels during chondrogenesis...
November 23, 2017: Cell Proliferation
https://www.readbyqxmd.com/read/29162512/mmp9-gene-expression-regulation-by-intragenic-epigenetic-modifications-in-breast-cancer
#12
Liliane M B Klassen, Andressa Chequin, Graciele C M Manica, Isis V Biembengut, Mariana B Toledo, Valter A Baura, Fábio de O Pedrosa, Edneia A S Ramos, Fabrício F Costa, Emanuel M De Souza, Giseli Klassen
Breast cancer is the most frequently diagnosed cancer and the leading cause of cancer death among women worldwide. Metastasis remains a major challenge for the clinical management and prognosis of patients with cancer. The metalloprotease MMP-9 plays a critical role in the first step of metastasis through extracellular matrix degradation. In this study, our goal was to determine the effect of epigenetic mechanisms in the promoter and intragenic region of this gene and to correlate it to the levels of expression of MMP9 in breast cancer cell lines...
November 18, 2017: Gene
https://www.readbyqxmd.com/read/29156705/upregulation-of-cd11b-and-cd86-through-lsd1-inhibition-promotes-myeloid-differentiation-and-suppresses-cell-proliferation-in-human-monocytic-leukemia-cells
#13
Jianwu Fang, Haiyan Ying, Ting Mao, Yanjia Fang, Yuan Lu, He Wang, Irene Zang, Zhaofu Wang, Ying Lin, Mengxi Zhao, Xiao Luo, Zongyao Wang, Yan Zhang, Chao Zhang, Wei Xiao, Yan Wang, Wei Tan, Zhui Chen, Chris Lu, Peter Atadja, En Li, Kehao Zhao, Jianfeng Liu, Justin Gu
LSD1 (Lysine Specific Demethylase1)/KDM1A (Lysine Demethylase 1A), a flavin adenine dinucleotide (FAD)-dependent histone H3K4/K9 demethylase, sustains oncogenic potential of leukemia stem cells in primary human leukemia cells. However, the pro-differentiation and anti-proliferation effects of LSD1 inhibition in acute myeloid leukemia (AML) are not yet fully understood. Here, we report that small hairpin RNA (shRNA) mediated LSD1 inhibition causes a remarkable transcriptional activation of myeloid lineage marker genes (CD11b/ITGAM and CD86), reduction of cell proliferation and decrease of clonogenic ability of human AML cells...
October 17, 2017: Oncotarget
https://www.readbyqxmd.com/read/29149419/changes-in-chromatin-state-reveal-arnt2-at-a-node-of-a-tumorigenic-transcription-factor-signature-driving-glioblastoma-cell-aggressiveness
#14
Alexandra Bogeas, Ghislaine Morvan-Dubois, Elias A El-Habr, François-Xavier Lejeune, Matthieu Defrance, Ashwin Narayanan, Klaudia Kuranda, Fanny Burel-Vandenbos, Salwa Sayd, Virgile Delaunay, Luiz G Dubois, Hugues Parrinello, Stéphanie Rialle, Sylvie Fabrega, Ahmed Idbaih, Jacques Haiech, Ivan Bièche, Thierry Virolle, Michele Goodhardt, Hervé Chneiweiss, Marie-Pierre Junier
Although a growing body of evidence indicates that phenotypic plasticity exhibited by glioblastoma cells plays a central role in tumor development and post-therapy recurrence, the master drivers of their aggressiveness remain elusive. Here we mapped the changes in active (H3K4me3) and repressive (H3K27me3) histone modifications accompanying the repression of glioblastoma stem-like cells tumorigenicity. Genes with changing histone marks delineated a network of transcription factors related to cancerous behavior, stem state, and neural development, highlighting a previously unsuspected association between repression of ARNT2 and loss of cell tumorigenicity...
November 17, 2017: Acta Neuropathologica
https://www.readbyqxmd.com/read/29148585/arsenite-downregulates-h3k4-trimethylation-and-h3k9-dimethylation-during-transformation-of-human-bronchial-epithelial-cells
#15
Wei Tu, Yin Liu, Chengfeng Xie, Xue Zhou
Arsenic is an established human carcinogen but with weak mutagenic activity. The mechanisms of arsenic-induced carcinogenesis are not well understood. In the present study, we investigated the role of histone methylation in transformation of human bronchial epithelial (BEAS-2B) cells. After 16 weeks' exposure, cells were transformed by 0.1, 0.5 and 1 μm arsenite. Global trimethylated H3K4 (H3K4me3) was decreased by 0.1 μm arsenite at 12 weeks, and 0.5 and 1 μm arsenite at 8, 12 and 16 weeks, which could be attributed to reduced histone methyltransferase activities, increased histone demethylase (HDM) activities as well as increased protein levels of H3K4 demethylase KDM5A...
November 17, 2017: Journal of Applied Toxicology: JAT
https://www.readbyqxmd.com/read/29138553/the-protective-effect-of-prmt6-overexpression-on-cigarette-smoke-extract-induced-murine-emphysema-model
#16
Xue He, Tiao Li, Naixin Kang, Huihui Zeng, Siying Ren, Dandan Zong, Jinhua Li, Shan Cai, Ping Chen, Yan Chen
Background: Cigarette smoke exposure is the most common risk factor for emphysema, which is one of the major pathologies of COPD. Protein arginine methyltransferase 6 (PRMT6) is a nuclear enzyme that specially catalyzes dimethylation of R2 in histone H3 (H3R2me2a). H3R2me2a prevents trimethylation of H3K4 (H3K4me3), which is located in the transcription start sites of genes in mammalian genomes. We attempted to determine the expression of PRMT6 in human samples, and investigate whether the upregulation of PRMT6 expression can attenuate the development of cigarette smoke extract (CSE)-induced emphysema...
2017: International Journal of Chronic Obstructive Pulmonary Disease
https://www.readbyqxmd.com/read/29138005/distinct-hypoxic-regulation-of-preadipocyte-factor-1-pref-1-in-preadipocytes-and-mature-adipocytes
#17
Yunwon Moon, Seongyeol Lee, Bongju Park, Hyunsung Park
Preadipocyte factor-1 (Pref-1) is a secretory soluble protein, which exerts pleiotropic effects on maintenance of cancer stem cell characteristics and commitment of mesenchymal stem cell lineages by inhibiting adipogenesis. Observations that obesity renders the microenvironment of adipose tissues hypoxic and that hypoxia inhibits adipogenesis lead us to investigate whether hypoxia increases the expression of anti-adipogenic Pref-1 in preadipocytes, mature adipocytes, and adipose tissues from obese mouse. In 3T3-L1 preadipocytes, hypoxia induces Pref-1 by a hypoxia-inducible factor 1 (HIF-1)-dependent mechanism accompanied by increase in the levels of the active histone mark, acetylated H3K9/14 (H3K9/14Ac)...
November 11, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29137925/polycomb-repression-complex-2-is-required-for-the-maintenance-of-retinal-progenitor-cells-and-balanced-retinal-differentiation
#18
Naoko Fujimura, Andrea Kuzelova, Anja Ebert, Hynek Strnad, Jitka Lachova, Ondrej Machon, Meinrad Busslinger, Zbynek Kozmik
Polycomb repressive complexes maintain transcriptional repression of genes encoding crucial developmental regulators through chromatin modification. Here we investigated the role of Polycomb repressive complex 2 (PRC2) in retinal development by inactivating its key components Eed and Ezh2. Conditional deletion of Ezh2 resulted in a partial loss of PRC2 function and accelerated differentiation of Müller glial cells. In contrast, inactivation of Eed led to the ablation of PRC2 function at early postnatal stage...
November 12, 2017: Developmental Biology
https://www.readbyqxmd.com/read/29133117/application-of-mixed-peptide-arrays-to-study-combinatorial-readout-of-chromatin-modifications
#19
Rebekka Mauser, Goran Kungulovski, David Meral, Daniel Maisch, Albert Jeltsch
The N-terminal tails of histone proteins are massively decorated with post-translational modifications (PTMs), which play important roles in the regulation of gene expression. Several highly conserved chromatin interacting proteins can bind to histone modifications in a sequence and modification specific manner employing specific reading domains. These proteins often contain several reading domains, which can cooperate in the readout of different PTMs. To gain a better insight into the combinatorial readout of PTMs, we developed a method to study the binding of double reading domains to mixed peptide arrays containing two different peptides in each spot...
November 10, 2017: Biochimie
https://www.readbyqxmd.com/read/29130966/itraq-based-proteomic-analysis-of-neonatal-kidney-from-offspring-of-protein-restricted-rats-reveals-abnormalities-in-intraflagellar-transport-proteins
#20
Xiaomei Liu, Jun Wang, Linlin Gao, Hao Liu, Caixia Liu
BACKGROUND: It is well recognized that adverse events in utero can impair fetal development and lead to the development of kidney injury and hypertension in adulthood. We previously reported a lower kidney index, glomeruli number, and decreased glomerular filtration rate in intrauterine growth restriction (IUGR) offspring induced by maternal protein malnutrition. To explore the molecular mechanisms linking impaired fetal growth to renal diseases, we investigated differentially expressed proteins (DEPs) in the IUGR neonatal kidneys by isobaric tags for relative and absolute quantitation (iTRAQ) analysis...
November 6, 2017: Cellular Physiology and Biochemistry
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