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Alvarez-Saavedra M, De Repentigny Y, Yang D, O’Meara R, Yan K, Hashem L, Racacho L, Ioshikhes I, Bulman D, Parks R, Kothary R, Picketts D. Voluntary Running Triggers VGF-Mediated Oligodendrogenesis to Prolong the Lifespan of Snf2h-Null Ataxic Mice. Cell Rep 2016; 17:862-875. [DOI: 10.1016/j.celrep.2016.09.030] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Revised: 07/20/2016] [Accepted: 09/09/2016] [Indexed: 12/13/2022] Open
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52
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Zaghlool A, Halvardson J, Zhao JJ, Etemadikhah M, Kalushkova A, Konska K, Jernberg-Wiklund H, Thuresson AC, Feuk L. A Role for the Chromatin-Remodeling Factor BAZ1A in Neurodevelopment. Hum Mutat 2016; 37:964-75. [PMID: 27328812 PMCID: PMC6681169 DOI: 10.1002/humu.23034] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2015] [Revised: 06/04/2016] [Accepted: 06/09/2016] [Indexed: 12/13/2022]
Abstract
Chromatin‐remodeling factors are required for a wide range of cellular and biological processes including development and cognition, mainly by regulating gene expression. As these functions would predict, deregulation of chromatin‐remodeling factors causes various disease syndromes, including neurodevelopmental disorders. Recent reports have linked mutations in several genes coding for chromatin‐remodeling factors to intellectual disability (ID). Here, we used exome sequencing and identified a nonsynonymous de novo mutation in BAZ1A (NM_182648.2:c.4043T > G, p.Phe1348Cys), encoding the ATP‐utilizing chromatin assembly and remodeling factor 1 (ACF1), in a patient with unexplained ID. ACF1 has been previously reported to bind to the promoter of the vitamin D receptor (VDR)‐regulated genes and suppress their expression. Our results show that the patient displays decreased binding of ACF1 to the promoter of the VDR‐regulated gene CYP24A1. Using RNA sequencing, we find that the mutation affects the expression of genes involved in several pathways including vitamin D metabolism, Wnt signaling and synaptic formation. RNA sequencing of BAZ1A knockdown cells and Baz1a knockout mice revealed that BAZ1A carry out distinctive functions in different tissues. We also demonstrate that BAZ1A depletion influence the expression of genes important for nervous system development and function. Our data point to an important role for BAZ1A in neurodevelopment, and highlight a possible link for BAZ1A to ID.
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Affiliation(s)
- Ammar Zaghlool
- Department of Immunology, Genetics and Pathology, Science for Life Laboratory, Uppsala University, Sweden
| | - Jonatan Halvardson
- Department of Immunology, Genetics and Pathology, Science for Life Laboratory, Uppsala University, Sweden
| | - Jin J Zhao
- Department of Immunology, Genetics and Pathology, Science for Life Laboratory, Uppsala University, Sweden
| | - Mitra Etemadikhah
- Department of Immunology, Genetics and Pathology, Science for Life Laboratory, Uppsala University, Sweden
| | - Antonia Kalushkova
- Department of Immunology, Genetics and Pathology, Science for Life Laboratory, Uppsala University, Sweden
| | - Katarzyna Konska
- Department of Immunology, Genetics and Pathology, Science for Life Laboratory, Uppsala University, Sweden
| | - Helena Jernberg-Wiklund
- Department of Immunology, Genetics and Pathology, Science for Life Laboratory, Uppsala University, Sweden
| | - Ann-Charlotte Thuresson
- Department of Immunology, Genetics and Pathology, Science for Life Laboratory, Uppsala University, Sweden
| | - Lars Feuk
- Department of Immunology, Genetics and Pathology, Science for Life Laboratory, Uppsala University, Sweden
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He S, Limi S, McGreal RS, Xie Q, Brennan LA, Kantorow WL, Kokavec J, Majumdar R, Hou H, Edelmann W, Liu W, Ashery-Padan R, Zavadil J, Kantorow M, Skoultchi AI, Stopka T, Cvekl A. Chromatin remodeling enzyme Snf2h regulates embryonic lens differentiation and denucleation. Development 2016; 143:1937-47. [PMID: 27246713 PMCID: PMC4920164 DOI: 10.1242/dev.135285] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2016] [Accepted: 03/21/2016] [Indexed: 12/30/2022]
Abstract
Ocular lens morphogenesis is a model for investigating mechanisms of cellular differentiation, spatial and temporal gene expression control, and chromatin regulation. Brg1 (Smarca4) and Snf2h (Smarca5) are catalytic subunits of distinct ATP-dependent chromatin remodeling complexes implicated in transcriptional regulation. Previous studies have shown that Brg1 regulates both lens fiber cell differentiation and organized degradation of their nuclei (denucleation). Here, we employed a conditional Snf2h(flox) mouse model to probe the cellular and molecular mechanisms of lens formation. Depletion of Snf2h induces premature and expanded differentiation of lens precursor cells forming the lens vesicle, implicating Snf2h as a key regulator of lens vesicle polarity through spatial control of Prox1, Jag1, p27(Kip1) (Cdkn1b) and p57(Kip2) (Cdkn1c) gene expression. The abnormal Snf2h(-/-) fiber cells also retain their nuclei. RNA profiling of Snf2h(-/) (-) and Brg1(-/-) eyes revealed differences in multiple transcripts, including prominent downregulation of those encoding Hsf4 and DNase IIβ, which are implicated in the denucleation process. In summary, our data suggest that Snf2h is essential for the establishment of lens vesicle polarity, partitioning of prospective lens epithelial and fiber cell compartments, lens fiber cell differentiation, and lens fiber cell nuclear degradation.
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Grants
- R01 EY012200 NEI NIH HHS
- R01 CA079057 NCI NIH HHS
- R01 DK096266 NIDDK NIH HHS
- R01 GM116143 NIGMS NIH HHS
- R01 EY013022 NEI NIH HHS
- R01 CA076329 NCI NIH HHS
- T32 GM007491 NIGMS NIH HHS
- R56 CA079057 NCI NIH HHS
- R01 EY014237 NEI NIH HHS
- 001 World Health Organization
- R01 EY022645 NEI NIH HHS
- Grant support: R01 EY012200 (AC), EY014237 (AC), EY014237-7S1 (AC), EY013022 (MK), CA079057 (AIS), EY022645 (WL), T32 GM007491 (SL), GACR: P305/12/1033 (TS, JK), UNCE: 204021 (TS, JK), and an unrestricted grant from Research to Prevent Blindness to the Department of Ophthalmology and Visual Sciences. TS is member of the BIOCEV ? Biotechnology and Biomedicine Centre of the Academy of Sciences and Charles University (CZ.1.05/1.1.00/02.0109) supported by the European Regional Development Fund. The Israel Science Foundation 610/10, the Israel Ministry of Science 36494, the Ziegler Foundation and the Binational Science Foundation (2013016) to RAP.
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Affiliation(s)
- Shuying He
- Department of Ophthalmology & Visual Sciences and Genetics, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Saima Limi
- Department of Ophthalmology & Visual Sciences and Genetics, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Rebecca S McGreal
- Department of Ophthalmology & Visual Sciences and Genetics, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Qing Xie
- Department of Ophthalmology & Visual Sciences and Genetics, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Lisa A Brennan
- Department of Biomedical Science, Florida Atlantic University, Boca Raton, FL 33431, USA
| | - Wanda Lee Kantorow
- Department of Biomedical Science, Florida Atlantic University, Boca Raton, FL 33431, USA
| | - Juraj Kokavec
- Department of Cell Biology, Albert Einstein College of Medicine, Bronx, NY 10461, USA First Faculty of Medicine, Charles University, 121 08 Prague, Czech Republic
| | - Romit Majumdar
- Department of Cell Biology, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Harry Hou
- Department of Cell Biology, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Winfried Edelmann
- Department of Cell Biology, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Wei Liu
- Department of Ophthalmology & Visual Sciences and Genetics, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Ruth Ashery-Padan
- Department of Human Molecular Genetics and Biochemistry, Sackler School of Medicine Tel-Aviv University, Ramat Aviv, Tel Aviv 69978, Israel
| | - Jiri Zavadil
- Department of Pathology and NYU Center for Health Informatics and Bioinformatics, New York University Langone Medical Center, New York, NY 10016, USA Mechanisms of Carcinogenesis Section, International Agency for Research on Cancer, Lyon Cedex 08 69372, France
| | - Marc Kantorow
- Department of Biomedical Science, Florida Atlantic University, Boca Raton, FL 33431, USA
| | - Arthur I Skoultchi
- Department of Cell Biology, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Tomas Stopka
- First Faculty of Medicine, Charles University, 121 08 Prague, Czech Republic
| | - Ales Cvekl
- Department of Ophthalmology & Visual Sciences and Genetics, Albert Einstein College of Medicine, Bronx, NY 10461, USA
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54
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Metzakopian E, Bouhali K, Alvarez-Saavedra M, Whitsett JA, Picketts DJ, Ang SL. Genome-wide characterisation of Foxa1 binding sites reveals several mechanisms for regulating neuronal differentiation in midbrain dopamine cells. Development 2016; 142:1315-24. [PMID: 25804738 PMCID: PMC4378246 DOI: 10.1242/dev.115808] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Midbrain dopamine neuronal progenitors develop into heterogeneous subgroups of neurons, such as substantia nigra pars compacta, ventral tegmental area and retrorubal field, that regulate motor control, motivated and addictive behaviours. The development of midbrain dopamine neurons has been extensively studied, and these studies indicate that complex cross-regulatory interactions between extrinsic and intrinsic molecules regulate a precise temporal and spatial programme of neurogenesis in midbrain dopamine progenitors. To elucidate direct molecular interactions between multiple regulatory factors during neuronal differentiation in mice, we characterised genome-wide binding sites of the forkhead/winged helix transcription factor Foxa1, which functions redundantly with Foxa2 to regulate the differentiation of mDA neurons. Interestingly, our studies identified a rostral brain floor plate Neurog2 enhancer that requires direct input from Otx2, Foxa1, Foxa2 and an E-box transcription factor for its transcriptional activity. Furthermore, the chromatin remodelling factor Smarca1 was shown to function downstream of Foxa1 and Foxa2 to regulate differentiation from immature to mature midbrain dopaminergic neurons. Our genome-wide Foxa1-bound cis-regulatory sequences from ChIP-Seq and Foxa1/2 candidate target genes from RNA-Seq analyses of embryonic midbrain dopamine cells also provide an excellent resource for probing mechanistic insights into gene regulatory networks involved in the differentiation of midbrain dopamine neurons. Summary: ChIP-Seq and RNA-Seq experiments identify novel molecular mechanisms underlying midbrain dopaminergic neuron production downstream of Foxa1 and Foxa2 during mouse neurogenesis.
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Affiliation(s)
| | - Kamal Bouhali
- Department of Developmental Neurobiology, NIMR, The Ridgeway, London NW7 1AA, UK
| | - Matías Alvarez-Saavedra
- Regenerative Medicine Program, Ottawa Hospital Research Institute, Ottawa, Ontario, Canada K1H 8L6 Department of Molecular Medicine, University of Ottawa, Ottawa, Ontario, Canada K1H 8M5
| | - Jeffrey A Whitsett
- Division of Pulmonary Biology, Cincinnati Children's Hospital Medical Center and University of Cincinnati College of Medicine, Cincinnati, OH 45229, USA
| | - David J Picketts
- Regenerative Medicine Program, Ottawa Hospital Research Institute, Ottawa, Ontario, Canada K1H 8L6 Departments of Biochemistry, Microbiology & Immunology, University of Ottawa, Ontario, Canada K1H 8M5
| | - Siew-Lan Ang
- Department of Developmental Neurobiology, NIMR, The Ridgeway, London NW7 1AA, UK
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55
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Lalli MA, Jang J, Park JHC, Wang Y, Guzman E, Zhou H, Audouard M, Bridges D, Tovar KR, Papuc SM, Tutulan-Cunita AC, Huang Y, Budisteanu M, Arghir A, Kosik KS. Haploinsufficiency of BAZ1B contributes to Williams syndrome through transcriptional dysregulation of neurodevelopmental pathways. Hum Mol Genet 2016; 25:1294-306. [PMID: 26755828 DOI: 10.1093/hmg/ddw010] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2015] [Accepted: 01/07/2016] [Indexed: 12/31/2022] Open
Abstract
Williams syndrome (WS) is a neurodevelopmental disorder caused by a genomic deletion of ∼28 genes that results in a cognitive and behavioral profile marked by overall intellectual impairment with relative strength in expressive language and hypersocial behavior. Advancements in protocols for neuron differentiation from induced pluripotent stem cells allowed us to elucidate the molecular circuitry underpinning the ontogeny of WS. In patient-derived stem cells and neurons, we determined the expression profile of the Williams-Beuren syndrome critical region-deleted genes and the genome-wide transcriptional consequences of the hemizygous genomic microdeletion at chromosome 7q11.23. Derived neurons displayed disease-relevant hallmarks and indicated novel aberrant pathways in WS neurons including over-activated Wnt signaling accompanying an incomplete neurogenic commitment. We show that haploinsufficiency of the ATP-dependent chromatin remodeler, BAZ1B, which is deleted in WS, significantly contributes to this differentiation defect. Chromatin-immunoprecipitation (ChIP-seq) revealed BAZ1B target gene functions are enriched for neurogenesis, neuron differentiation and disease-relevant phenotypes. BAZ1B haploinsufficiency caused widespread gene expression changes in neural progenitor cells, and together with BAZ1B ChIP-seq target genes, explained 42% of the transcriptional dysregulation in WS neurons. BAZ1B contributes to regulating the balance between neural precursor self-renewal and differentiation and the differentiation defect caused by BAZ1B haploinsufficiency can be rescued by mitigating over-active Wnt signaling in neural stem cells. Altogether, these results reveal a pivotal role for BAZ1B in neurodevelopment and implicate its haploinsufficiency as a likely contributor to the neurological phenotypes in WS.
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Affiliation(s)
- Matthew A Lalli
- Department of Molecular, Cellular, and Developmental Biology, Neuroscience Research Institute, Biomolecular Science and Engineering Program
| | - Jiwon Jang
- Department of Molecular, Cellular, and Developmental Biology, Neuroscience Research Institute
| | - Joo-Hye C Park
- Department of Molecular, Cellular, and Developmental Biology, Neuroscience Research Institute
| | - Yidi Wang
- Department of Molecular, Cellular, and Developmental Biology, Neuroscience Research Institute
| | - Elmer Guzman
- Department of Molecular, Cellular, and Developmental Biology, Neuroscience Research Institute
| | - Hongjun Zhou
- Department of Molecular, Cellular, and Developmental Biology, Neuroscience Research Institute
| | - Morgane Audouard
- Department of Molecular, Cellular, and Developmental Biology, Neuroscience Research Institute
| | - Daniel Bridges
- Department of Molecular, Cellular, and Developmental Biology, Neuroscience Research Institute, Department of Physics, University of California, Santa Barbara, CA, USA
| | - Kenneth R Tovar
- Department of Molecular, Cellular, and Developmental Biology, Neuroscience Research Institute
| | - Sorina M Papuc
- Victor Babes National Institute of Pathology, Clinical Cytogenetics, Bucharest, Romania
| | | | - Yadong Huang
- Gladstone Institute of Neurological Disease, University of California, San Francisco, CA, USA and
| | - Magdalena Budisteanu
- Victor Babes National Institute of Pathology, Clinical Cytogenetics, Bucharest, Romania, Alexandru Obregia Clinical Hospital of Psychiatry, Neuropediatric Pathology, Bucharest, Romania
| | - Aurora Arghir
- Victor Babes National Institute of Pathology, Clinical Cytogenetics, Bucharest, Romania
| | - Kenneth S Kosik
- Department of Molecular, Cellular, and Developmental Biology, Neuroscience Research Institute, Biomolecular Science and Engineering Program,
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56
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Zhu X, Girardo D, Govek EE, John K, Mellén M, Tamayo P, Mesirov JP, Hatten ME. Role of Tet1/3 Genes and Chromatin Remodeling Genes in Cerebellar Circuit Formation. Neuron 2015; 89:100-12. [PMID: 26711116 DOI: 10.1016/j.neuron.2015.11.030] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2015] [Revised: 07/27/2015] [Accepted: 11/12/2015] [Indexed: 12/22/2022]
Abstract
Although mechanisms underlying early steps in cerebellar development are known, evidence is lacking on genetic and epigenetic changes during the establishment of the synaptic circuitry. Using metagene analysis, we report pivotal changes in multiple reactomes of epigenetic pathway genes in cerebellar granule cells (GCs) during circuit formation. During this stage, Tet genes are upregulated and vitamin C activation of Tet enzymes increases the levels of 5-hydroxymethylcytosine (5hmC) at exon start sites of upregulated genes, notably axon guidance genes and ion channel genes. Knockdown of Tet1 and Tet3 by RNAi in ex vivo cerebellar slice cultures inhibits dendritic arborization of developing GCs, a critical step in circuit formation. These findings demonstrate a role for Tet genes and chromatin remodeling genes in the formation of cerebellar circuitry.
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Affiliation(s)
- Xiaodong Zhu
- Laboratory of Developmental Neurobiology, The Rockefeller University, New York, NY 10065, USA
| | - David Girardo
- Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA
| | - Eve-Ellen Govek
- Laboratory of Developmental Neurobiology, The Rockefeller University, New York, NY 10065, USA
| | - Keisha John
- Laboratory of Developmental Neurobiology, The Rockefeller University, New York, NY 10065, USA
| | - Marian Mellén
- Laboratory of Molecular Biology, The Rockefeller University, New York, NY 10065, USA
| | - Pablo Tamayo
- Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA
| | - Jill P Mesirov
- Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA
| | - Mary E Hatten
- Laboratory of Developmental Neurobiology, The Rockefeller University, New York, NY 10065, USA.
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57
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Bednar J, Hamiche A, Dimitrov S. H1-nucleosome interactions and their functional implications. BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS 2015; 1859:436-43. [PMID: 26477489 DOI: 10.1016/j.bbagrm.2015.10.012] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2015] [Revised: 10/09/2015] [Accepted: 10/13/2015] [Indexed: 01/13/2023]
Abstract
Linker histones are three domain proteins and consist of a structured (globular) domain, flanked by two likely non-structured NH2- and COOH-termini. The binding of the linker histones to the nucleosome was characterized by different methods in solution. Apparently, the globular domain interacts with the linker DNA and the nucleosome dyad, while the binding of the large and rich in lysines COOH-terminus results in "closing" the linker DNA of the nucleosome and the formation of the "stem" structure. What is the mode of binding of the linker histones within the chromatin fiber remains still elusive. Nonetheless, it is clear that linker histones are essential for both the assembly and maintenance of the condensed chromatin fiber. Interestingly, linker histones are post-translationally modified and how this affects both their binding to chromatin and functions is now beginning to emerge. In addition, linker histones are highly mobile in vivo, but not in vitro. No explanation of this finding is reported for the moment. The higher mobility of the linker histones should, however, have strong impact on their function. Linker histones plays an important role in gene expression regulation and other chromatin related process and their function is predominantly regulated by their posttranslational modifications. However, the detailed mechanism how the linker histones do function remains still not well understood despite numerous efforts. Here we will summarize and analyze the data on the linker histone binding to the nucleosome and the chromatin fiber and will discuss its functional consequences.
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Affiliation(s)
- Jan Bednar
- Université de Grenoble Alpes/CNRS, Laboratoire Interdisciplinaire de Physique, UMR 5588, 140 rue de la Physique, B.P. 87, St. Martin d'Heres, F-38402, France.
| | - Ali Hamiche
- Equipe labellisée Ligue contre le Cancer, Département de Génomique Fonctionnelle et Cancer, Institut de Génétique et Biologie Moléculaire et Cellulaire (IGBMC), UDS, CNRS, INSERM, 1 rue Laurent Fries, B.P. 10142, 67404 Illkirch Cedex, France
| | - Stefan Dimitrov
- INSERM/UJF, Institut Albert Bonniot, U823, Site Santé-BP 170, 38042 Grenoble Cedex 9, France
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58
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Almuzzaini B, Sarshad AA, Farrants AKÖ, Percipalle P. Nuclear myosin 1 contributes to a chromatin landscape compatible with RNA polymerase II transcription activation. BMC Biol 2015; 13:35. [PMID: 26044184 PMCID: PMC4486089 DOI: 10.1186/s12915-015-0147-z] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2014] [Accepted: 06/02/2015] [Indexed: 12/11/2022] Open
Abstract
Background Nuclear myosin 1c (NM1) is emerging as a regulator of transcription and chromatin organization. Results Using chromatin immunoprecipitation and deep sequencing (ChIP-Seq) in combination with molecular analyses, we investigated the global association of NM1 with the mammalian genome. Analysis of the ChIP-Seq data demonstrates that NM1 binds across the entire mammalian genome with occupancy peaks correlating with distributions of RNA Polymerase II (Pol II) and active epigenetic marks at class II gene promoters. In mouse embryonic fibroblasts subjected to RNAi mediated NM1 gene silencing, we show that NM1 synergizes with polymerase-associated actin to maintain active Pol II at the promoter. NM1 also co-localizes with the nucleosome remodeler SNF2h at class II promoters where they assemble together with WSTF as part of the B-WICH complex. A high resolution micrococcal nuclease (MNase) assay and quantitative real time PCR shows that this mechanism is required for local chromatin remodeling. Following B-WICH assembly, NM1 mediates physical recruitment of the histone acetyl transferase PCAF and the histone methyl transferase Set1/Ash2 to maintain and preserve H3K9acetylation and H3K4trimethylation for active transcription. Conclusions We propose a novel genome-wide mechanism where myosin synergizes with Pol II-associated actin to link the polymerase machinery with permissive chromatin for transcription activation. Electronic supplementary material The online version of this article (doi:10.1186/s12915-015-0147-z) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Bader Almuzzaini
- Department of Cell and Molecular Biology, Karolinska Institute, Box 285, SE-171 77, Stockholm, Sweden.
| | - Aishe A Sarshad
- Department of Cell and Molecular Biology, Karolinska Institute, Box 285, SE-171 77, Stockholm, Sweden. .,Present address: National Institute of Health, National Institute of Arthritis and Musculoskeletal and Skin Diseases, Bethesda, MD, 20892-3675, USA.
| | - Ann-Kristin Östlund Farrants
- Department of Molecular Biosciences, The Wenner-Gren Institute, Stockholm University, SE-106 91, Stockholm, Sweden.
| | - Piergiorgio Percipalle
- Department of Cell and Molecular Biology, Karolinska Institute, Box 285, SE-171 77, Stockholm, Sweden.
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59
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A novel approach for studying histone H1 function in vivo. Genetics 2015; 200:29-33. [PMID: 25805849 DOI: 10.1534/genetics.114.170514] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2015] [Accepted: 03/17/2015] [Indexed: 11/18/2022] Open
Abstract
In this report, we investigate the mechanisms that regulate Drosophila histone H1 expression and its association with chromatin in vivo. We show that histone H1 is subject to negative autoregulation and exploit this result to examine the effects of mutations of the main phosphorylation site of histone H1.
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60
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Kristie TM. Dynamic modulation of HSV chromatin drives initiation of infection and provides targets for epigenetic therapies. Virology 2015; 479-480:555-61. [PMID: 25702087 DOI: 10.1016/j.virol.2015.01.026] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2014] [Revised: 01/25/2015] [Accepted: 01/30/2015] [Indexed: 10/24/2022]
Abstract
Upon infection, the genomes of herpesviruses undergo a striking transition from a non-nucleosomal structure to a chromatin structure. The rapid assembly and modulation of nucleosomes during the initial stage of infection results in an overlay of complex regulation that requires interactions of a plethora of chromatin modulation components. For herpes simplex virus, the initial chromatin dynamic is dependent on viral and host cell transcription factors and coactivators that mediate the balance between heterochromatic suppression of the viral genome and the euchromatin transition that allows and promotes the expression of viral immediate early genes. Strikingly similar to lytic infection, in sensory neurons this dynamic transition between heterochromatin and euchromatin governs the establishment, maintenance, and reactivation from the latent state. Chromatin dynamics in both the lytic infection and latency-reactivation cycles provides opportunities to shift the balance using small molecule epigenetic modulators to suppress viral infection, shedding, and reactivation from latency.
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Affiliation(s)
- Thomas M Kristie
- Molecular Genetics Section, Laboratory of Viral Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health Bld 33, Rm 3W20B.7 33 North Drive,, Bethesda, MA 20892, USA.
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