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https://www.readbyqxmd.com/read/28506463/rna-pol-ii-dynamics-modulate-co-transcriptional-chromatin-modification-ctd-phosphorylation-and-transcriptional-direction
#1
Nova Fong, Tassa Saldi, Ryan M Sheridan, Michael A Cortazar, David L Bentley
Eukaryotic genes are marked by conserved post-translational modifications on the RNA pol II C-terminal domain (CTD) and the chromatin template. How the 5'-3' profiles of these marks are established is poorly understood. Using pol II mutants in human cells, we found that slow transcription repositioned specific co-transcriptionally deposited chromatin modifications; histone H3 lysine 36 trimethyl (H3K36me3) shifted within genes toward 5' ends, and histone H3 lysine 4 dimethyl (H3K4me2) extended farther upstream of start sites...
May 18, 2017: Molecular Cell
https://www.readbyqxmd.com/read/28490774/dmba-acts-on-cumulus-cells-to-desynchronize-nuclear-and-cytoplasmic-maturation-of-pig-oocytes
#2
Zhi-Qiang Song, Xuan Li, Yan-Kui Wang, Zhi-Qiang Du, Cai-Xia Yang
As an environmental pollutant and carcinogen, 7,12-dimethylbenz[a]anthracene (DMBA) can destroy ovarian follicles at all developmental stages in rodents. However, the underlying molecular mechanism remains obscure. In the present study, we aim to address how DMBA affects the in vitro maturation and development of porcine oocytes. We discovered that for 20 μM DMBA-treated cumulus-oocyte complexes (COCs), the rate of oocyte germinal vesicle breakdown (GVBD) was significantly altered, and the extrusion rate of first polar body was increased...
May 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28468635/prc2-represses-transcribed-genes-on-the-imprinted-inactive-x-chromosome-in-mice
#3
Emily Maclary, Michael Hinten, Clair Harris, Shriya Sethuraman, Srimonta Gayen, Sundeep Kalantry
BACKGROUND: Polycomb repressive complex 2 (PRC2) catalyzes histone H3K27me3, which marks many transcriptionally silent genes throughout the mammalian genome. Although H3K27me3 is associated with silenced gene expression broadly, it remains unclear why some but not other PRC2 target genes require PRC2 and H3K27me3 for silencing. RESULTS: Here we define the transcriptional and chromatin features that predict which PRC2 target genes require PRC2/H3K27me3 for silencing by interrogating imprinted mouse X-chromosome inactivation...
May 3, 2017: Genome Biology
https://www.readbyqxmd.com/read/28460001/the-atp-dependent-chromatin-remodeler-chd1-is-recruited-by-transcription-elongation-factors-and-maintains-h3k4me3-h3k36me3-domains-at-actively-transcribed-and-spliced-genes
#4
Yaelim Lee, Daechan Park, Vishwanath R Iyer
Chd1 (Chromodomain Helicase DNA Binding Protein 1) is a conserved ATP-dependent chromatin remodeler that maintains the nucleosomal structure of chromatin, but the determinants of its specificity and its impact on gene expression are not well defined. To identify the determinants of Chd1 binding specificity in the yeast genome, we investigated Chd1 occupancy in mutants of several candidate factors. We found that several components of the PAF1 transcription elongation complex contribute to Chd1 recruitment to highly transcribed genes and identified Spt4 as a factor that appears to negatively modulate Chd1 binding to chromatin...
April 29, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28454114/estimating-the-effects-of-transcription-factors-binding-and-histone-modifications-on-gene-expression-levels-in-human-cells
#5
Lu-Qiang Zhang, Qian-Zhong Li
Transcription factors and histone modifications are vital for the regulation of gene expression. Hence, to estimate the effects of transcription factors binding and histone modifications on gene expression, we construct a statistical model for the genome-wide 15 transcription factors binding data, 10 histone modifications profiles and DNase-I hypersensitivity data in three mammalian. Remarkably, our results show POLR2A and H3K36me3 can highly and consistently predict gene expression in three cell lines. And H3K4me3, H3K27me3 and H3K9ac are more reliable predictors than other histone modifications in human embryonic stem cells...
April 9, 2017: Oncotarget
https://www.readbyqxmd.com/read/28442531/gene-body-dna-methylation-conspires-with-h3k36me3-to-preclude-aberrant-transcription
#6
Aurélie Teissandier, Déborah Bourc'his
No abstract text is available yet for this article.
April 25, 2017: EMBO Journal
https://www.readbyqxmd.com/read/28430823/modulation-the-alternative-splicing-of-gla-ivs4-919g-a-in-fabry-disease
#7
Wen-Hsin Chang, Dau-Ming Niu, Chi-Yu Lu, Shyr-Yi Lin, Ta-Chih Liu, Jan-Gowth Chang
While a base substitution in intron 4 of GLA (IVS4+919G>A) that causes aberrant alternative splicing resulting in Fabry disease has been reported, its molecular mechanism remains unclear. Here we reported that upon IVS4+919G>A transversion, H3K36me3 was enriched across the alternatively spliced region. PSIP1, an adapter of H3K36me3, together with Hsp70 and NONO were recruited and formed a complex with SF2/ASF and SRp20, which further promoted GLA splicing. Amiloride, a splicing regulator in cancer cells, could reverse aberrant histone modification patterns and disrupt the association of splicing complex with GLA...
2017: PloS One
https://www.readbyqxmd.com/read/28408367/variability-in-chromatin-architecture-and-associated-dna-repair-at-genomic-positions-containing-somatic-mutations
#8
Byungho Lim, Jihyeob Mun, Yong Sung Kim, Seon-Young Kim
Dynamic chromatin structures result in differential chemical reactivity to mutational processes throughout the genome. To identify chromatin features responsible for mutagenesis, we compared chromatin architecture around single-nucleotide variants (SNV), insertion/deletions (indels) and their context-matched, non-mutated positions. We found epigenetic differences between genomic regions containing missense SNV and those containing frameshift indels across multiple cancer types. Levels active histone marks were higher around frameshift indels than around missense SNV, whereas repressive histone marks exhibited the reverse trend...
April 13, 2017: Cancer Research
https://www.readbyqxmd.com/read/28398509/mll3-mll4-are-required-for-cbp-p300-binding-on-enhancers-and-super-enhancer-formation-in-brown-adipogenesis
#9
Binbin Lai, Ji-Eun Lee, Younghoon Jang, Lifeng Wang, Weiqun Peng, Kai Ge
Histone H3K4me1/2 methyltransferases MLL3/MLL4 and H3K27 acetyltransferases CBP/p300 are major enhancer epigenomic writers. To understand how these epigenomic writers orchestrate enhancer landscapes in cell differentiation, we have profiled genomic binding of MLL4, CBP, lineage-determining transcription factors (EBF2, C/EBPβ, C/EBPα, PPARγ), coactivator MED1, RNA polymerase II, as well as epigenome (H3K4me1/2/3, H3K9me2, H3K27me3, H3K36me3, H3K27ac), transcriptome and chromatin opening during adipogenesis of immortalized preadipocytes derived from mouse brown adipose tissue (BAT)...
April 8, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28381181/effect-of-histone-modifications-on-hmlh1-alternative-splicing-in-gastric-cancer
#10
Jin-Xuan Zhao, Xiao-Wei Li, Bing-Yu Shi, Fang Wang, Zheng-Rong Xu, Hai-Lan Meng, Yun-Yan Su, Jing-Mei Wang, Nong Xiao, Qiong He, Ya-Ping Wang, Yi-Mei Fan
hMLH1 is one of the mismatch genes closely related to the occurrence of gastric cancer. Epigenetic regulation may play more important roles than gene mutations in DNA damage repair genes to drive carcinogenesis. In this article, we discuss the role of epigenetic changes, especially histone modifications in the regulation of hMLH1 alternative splicing. Our results showed that hMLH1 delEx10, delEx11, delEx10-11, delEx16 and delEx17 transcripts were ubiquitous in sporadic Chinese gastric cancer patients and gastric cancer cell lines...
April 2017: Tumour Biology: the Journal of the International Society for Oncodevelopmental Biology and Medicine
https://www.readbyqxmd.com/read/28346137/histone-gene-replacement-reveals-a-post-transcriptional-role-for-h3k36-in-maintaining-metazoan-transcriptome-fidelity
#11
Michael P Meers, Telmo Henriques, Christopher A Lavender, Daniel J McKay, Brian D Strahl, Robert J Duronio, Karen Adelman, A Gregory Matera
Histone H3 lysine 36 methylation (H3K36me) is thought to participate in a host of co-transcriptional regulatory events. To study the function of this residue independent from the enzymes that modify it, we used a 'histone replacement' system in Drosophila to generate a non-modifiable H3K36 lysine-to-arginine (H3K36R) mutant. We observed global dysregulation of mRNA levels in H3K36R animals that correlates with the incidence of H3K36me3. Similar to previous studies, we found that mutation of H3K36 also resulted in H4 hyperacetylation...
March 27, 2017: ELife
https://www.readbyqxmd.com/read/28334849/icf-specific-dnmt3b-dysfunction-interferes-with-intragenic-regulation-of-mrna-transcription-and-alternative-splicing
#12
Sole Gatto, Miriam Gagliardi, Monica Franzese, Sylwia Leppert, Mariarosaria Papa, Marco Cammisa, Giacomo Grillo, Guillame Velasco, Claire Francastel, Shir Toubiana, Maurizio D'Esposito, Claudia Angelini, Maria R Matarazzo
Hypomorphic mutations in DNA-methyltransferase DNMT3B cause majority of the rare disorder Immunodeficiency, Centromere instability and Facial anomalies syndrome cases (ICF1). By unspecified mechanisms, mutant-DNMT3B interferes with lymphoid-specific pathways resulting in immune response defects. Interestingly, recent findings report that DNMT3B shapes intragenic CpG-methylation of highly-transcribed genes. However, how the DNMT3B-dependent epigenetic network modulates transcription and whether ICF1-specific mutations impair this process remains unknown...
March 9, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28260718/loss-of-setd2-but-not-h3k36me3-correlates-with-aggressive-clinicopathological-features-of-clear-cell-renal-cell-carcinoma-patients
#13
Lei Liu, Renbo Guo, Xiang Zhang, Yiran Liang, Feng Kong, Jue Wang, Zhonghua Xu
Recent studies facilitated by DNA sequencing identified the histone modifying gene SETD2 as the second most frequent mutant gene in sporadic clear cell renal cell carcinoma (ccRCC) patients. SETD2 functions as a tumor suppressor in ccRCC. However, its clinical association and biological functions are not fully delineated. The aim of this study is to evaluate the clinical significance of SETD2 in ccRCC patients. SETD2 and its canonical histone modification product H3K36me3 were analyzed by immunohistochemistry (IHC) in 155 ccRCC patients from two independent cohorts retrospectively...
March 6, 2017: Bioscience Trends
https://www.readbyqxmd.com/read/28225755/intragenic-dna-methylation-prevents-spurious-transcription-initiation
#14
Francesco Neri, Stefania Rapelli, Anna Krepelova, Danny Incarnato, Caterina Parlato, Giulia Basile, Mara Maldotti, Francesca Anselmi, Salvatore Oliviero
In mammals, DNA methylation occurs mainly at CpG dinucleotides. Methylation of the promoter suppresses gene expression, but the functional role of gene-body DNA methylation in highly expressed genes has yet to be clarified. Here we show that, in mouse embryonic stem cells, Dnmt3b-dependent intragenic DNA methylation protects the gene body from spurious RNA polymerase II entry and cryptic transcription initiation. Using different genome-wide approaches, we demonstrate that this Dnmt3b function is dependent on its enzymatic activity and recruitment to the gene body by H3K36me3...
February 22, 2017: Nature
https://www.readbyqxmd.com/read/28219807/setd2-is-associated-with-strontium-induced-bone-regeneration
#15
Xiaoshi Jia, Qiaoyun Long, Richard J Miron, Chengcheng Yin, Yan Wei, Yufeng Zhang, Min Wu
Strontium Ranelate has been utilized as a preventative treatment option for osteoporosis with the release of Sr ions having a direct effect on preventing osteoclast activation and promoting osteoblast differentiation. Previously our group has prepared and characterized a porous Sr-mesoporous bioactive glass (Sr-MBG) scaffold demonstrating its ability to enhance new bone formation when compared to MBG alone. The goal of the present study was to elucidate the bone-inducing properties of Sr by utilizing RNA-seq on in vivo tissue samples to investigate potential target genes responsible for Sr-induced new bone formation...
February 20, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28211484/regulation-of-mrna-splicing-by-mecp2-via-epigenetic-modifications-in-the-brain
#16
Tian-Lin Cheng, Jingqi Chen, Huida Wan, Bin Tang, Weidong Tian, Lujian Liao, Zilong Qiu
Mutations of X-linked gene Methyl CpG binding protein 2 (MECP2) are the major causes of Rett syndrome (RTT), a severe neurodevelopmental disorder. Duplications of MECP2-containing genomic segments lead to severe autistic symptoms in human. MECP2-coding protein methyl-CpG-binding protein 2 (MeCP2) is involved in transcription regulation, microRNA processing and mRNA splicing. However, molecular mechanisms underlying the involvement of MeCP2 in mRNA splicing in neurons remain largely elusive. In this work we found that the majority of MeCP2-associated proteins are involved in mRNA splicing using mass spectrometry analysis with multiple samples from Mecp2-null rat brain, mouse primary neuron and human cell lines...
February 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28207953/sgs1-a-neomorphic-nac52-allele-impairing-post-transcriptional-gene-silencing-through-sgs3-downregulation
#17
Nicolas Butel, Ivan Le Masson, Nathalie Bouteiller, Hervé Vaucheret, Taline Elmayan
Post-transcriptional gene silencing (PTGS) is a defense mechanism that targets invading nucleic acids from endogenous (transposons) or exogenous (pathogens, transgenes) sources. Genetic screens based on the reactivation of silenced transgenes have long been used to identify cellular components and regulators of PTGS. Here we show that the first isolated PTGS-deficient mutant, sgs1, is impaired in the transcription factor NAC52. This mutant exhibits striking similarities to a mutant impaired in the H3K4me3 demethylase JMJ14 isolated from the same genetic screen...
May 2017: Plant Journal: for Cell and Molecular Biology
https://www.readbyqxmd.com/read/28202515/systematic-in-vivo-inactivation-of-chromatin-regulating-enzymes-identifies-setd2-as-a-potent-tumor-suppressor-in-lung-adenocarcinoma
#18
David M Walter, Olivia S Venancio, Elizabeth L Buza, John W Tobias, Charuhas Deshpande, A Andrea Gudiel, Caroline Kim-Kiselak, Michelle Cicchini, Travis J Yates, David M Feldser
Chromatin-modifying genes are frequently mutated in human lung adenocarcinoma, but the functional impact of these mutations on disease initiation and progression is not well understood. Using a CRISPR-based approach, we systematically inactivated three of the most commonly mutated chromatin regulatory genes in two Kras(G12D)-driven mouse models of lung adenocarcinoma to characterize the impact of their loss. Targeted inactivation of SWI/SNF nucleosome-remodeling complex members Smarca4 (Brg1) or Arid1a had complex effects on lung adenocarcinoma initiation and progression...
April 1, 2017: Cancer Research
https://www.readbyqxmd.com/read/28105934/charm-discovery-of-combinatorial-chromatin-modification-patterns-in-hepatitis-b-virus-x-transformed-mouse-liver-cancer-using-association-rule-mining
#19
Sung Hee Park, Sun-Min Lee, Young-Joon Kim, Sangsoo Kim
BACKGROUND: Various chromatin modifications, identified in large-scale epigenomic analyses, are associated with distinct phenotypes of different cells and disease phases. To improve our understanding of these variations, many computational methods have been developed to discover novel sites and cell-specific chromatin modifications. Despite the availability of existing methods, there is still room for further improvement when they are applied to resolve the histone code hypothesis. Hence, we aim to investigate the development of a computational method to provide new insights into de novo combinatorial pattern discovery of chromatin modifications to characterize epigenetic variations in distinct phenotypes of different cells...
December 13, 2016: BMC Bioinformatics
https://www.readbyqxmd.com/read/28100301/high-throughput-screening-of-a-glaxosmithkline-protein-kinase-inhibitor-set-identifies-an-inhibitor-of-human-cytomegalovirus-replication-that-prevents-creb-and-histone-h3-post-translational-modification
#20
Amina S Khan, Matthew J Murray, Catherine M K Ho, William J Zuercher, Matthew B Reeves, Blair L Strang
To identify new compounds with anti-human cytomegalovirus (HCMV) activity and new anti-HCMV targets, we developed a high-throughput strategy to screen a GlaxoSmithKline Published Kinase Inhibitor Set. This collection contains a range of extensively characterized compounds grouped into chemical families (chemotypes). From our screen, we identified compounds within chemotypes that impede HCMV protein production and identified kinase proteins associated with inhibition of HCMV protein production that are potential novel anti-HCMV targets...
April 2017: Journal of General Virology
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