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Fujii T, Ueda T, Nagata S, Fukunaga R. Essential role of p400/mDomino chromatin-remodeling ATPase in bone marrow hematopoiesis and cell-cycle progression. J Biol Chem 2010; 285:30214-23. [PMID: 20610385 DOI: 10.1074/jbc.m110.104513] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
p400/mDomino is an ATP-dependent chromatin-remodeling protein that catalyzes the deposition of histone variant H2A.Z into nucleosomes to regulate gene expression. We previously showed that p400/mDomino is essential for embryonic development and primitive hematopoiesis. Here we generated a conditional knock-out mouse for the p400/mDomino gene and investigated the role of p400/mDomino in adult bone marrow hematopoiesis and in the cell-cycle progression of embryonic fibroblasts. The Mx1-Cre- mediated deletion of p400/mDomino resulted in an acute loss of nucleated cells in the bone marrow, including committed myeloid and erythroid cells as well as hematopoietic progenitor and stem cells. A hematopoietic colony assay revealed a drastic reduction in colony-forming activity after the deletion of p400/mDomino. Moreover, the loss of p400/mDomino in mouse embryonic fibroblasts (MEFs) resulted in strong growth inhibition. Cell-cycle analysis revealed that the mDomino-deficient MEFs exhibited a pleiotropic cell-cycle defect at the S and G(2)/M phases, and polyploid and multi-nucleated cells with micronuclei emerged. DNA microarray analysis revealed that the p400/mDomino deletion from MEFs caused the impaired expression of many cell-cycle-regulatory genes, including G(2)/M-specific genes targeted by the transcription factors FoxM1 and c-Myc. These results indicate that p400/mDomino plays a key role in cellular proliferation by controlling the expression of cell-cycle-regulatory genes.
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Affiliation(s)
- Toshihiro Fujii
- Department of Medical Chemistry, Graduate School of Medicine, Kyoto University, Yoshida-Konoe, Sakyo-ku, Kyoto 606-8501, Japan
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202
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Abstract
In eukaryotic genomes, gene expression and DNA recombination are affected by structural chromatin traits. Chromatin structure is shaped by the activity of enzymes that either introduce covalent modifications in DNA and histone proteins or use energy from ATP to disrupt histone-DNA interactions. The genomic 'marks' that are generated by covalent modifications of histones and DNA, or by the deposition of histone variants, are susceptible to being altered in response to stress. Recent evidence has suggested that proteins generating these epigenetic marks play crucial roles in the defence against pathogens. Histone deacetylases are involved in the activation of jasmonic acid- and ethylene-sensitive defence mechanisms. ATP-dependent chromatin remodellers mediate the constitutive repression of the salicylic acid-dependent pathway, whereas histone methylation at the WRKY70 gene promoter affects the activation of this pathway. Interestingly, bacterial-infected tissues show a net reduction in DNA methylation, which may affect the disease resistance genes responsible for the surveillance against pathogens. As some epigenetic marks can be erased or maintained and transmitted to offspring, epigenetic mechanisms may provide plasticity for the dynamic control of emerging pathogens without the generation of genomic lesions.
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Affiliation(s)
- María E Alvarez
- CIQUIBIC-CONICET, Departamento de Química Biológica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, 5000 Córdoba, Argentina.
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203
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Ahmad A, Zhang Y, Cao XF. Decoding the epigenetic language of plant development. MOLECULAR PLANT 2010; 3:719-28. [PMID: 20663898 PMCID: PMC2910553 DOI: 10.1093/mp/ssq026] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2010] [Accepted: 04/29/2010] [Indexed: 05/21/2023]
Abstract
Epigenetics refers to the study of heritable changes in gene expression or cellular phenotype without changes in DNA sequence. Epigenetic regulation of gene expression is accomplished by DNA methylation, histone modifications, histone variants, chromatin remodeling, and may involve small RNAs. DNA methylation at cytosine is carried out by enzymes called DNA Methyltransferases and is involved in many cellular processes, such as silencing of transposable elements and pericentromeric repeats, X-chromosome inactivation and genomic imprinting, etc. Histone modifications refer to posttranslational covalent attachment of chemical groups onto histones such as phosphorylation, acetylation, and methylation, etc. Histone variants, the non-canonical histones with amino acid sequences divergent from canonical histones, can have different epigenetic impacts on the genome from canonical histones. Higher-order chromatin structures maintained or modified by chromatin remodeling proteins also play important roles in regulating gene expression. Small non-coding RNAs play various roles in the regulation of gene expression at pre- as well as posttranscriptional levels. A special issue of Molecular Plant on 'Epigenetics and Plant Development' (Volume 4, Number 2, 2009) published a variety of articles covering many aspects of epigenetic regulation of plant development. We have tried here to present a bird's-eye view of these credible efforts towards understanding the mysterious world of epigenetics. The majority of the articles are about the chromatin modifying proteins, including histone modifiers, histone variants, and chromatin remodeling proteins that regulate various developmental processes, such as flowering time, vernalization, stem cell maintenance, and response to hormonal and environmental stresses, etc. Regulation of expression of seed transcriptome, involvement of direct tandem repeat elements in the PHE1 imprinting in addition to PcG proteins activity, paramutation, and epigenetic barriers in species hybridization are described well. The last two papers are about the Pol V-mediated heterochromatin formation independent of the 24nt-siRNA and the effect of genome position and tissue type on epigenetic regulation of gene expression. These findings not only further our current understanding of epigenetic mechanisms involved in many biological phenomena, but also pave the path for the future work, by raising many new questions that are discussed in the following lines.
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Affiliation(s)
- Ayaz Ahmad
- State Key Laboratory of Plant Genomics and National Center for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China
- Graduate University of the Chinese Academy of Sciences, Yuquan Road, Beijing 100039, China
| | - Yong Zhang
- State Key Laboratory of Plant Genomics and National Center for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China
- Graduate University of the Chinese Academy of Sciences, Yuquan Road, Beijing 100039, China
| | - Xiao-Feng Cao
- State Key Laboratory of Plant Genomics and National Center for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China
- To whom correspondence should be addressed. E-mail , fax 86-10-64873428, tel. 86-10-64869203
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204
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Halley JE, Kaplan T, Wang AY, Kobor MS, Rine J. Roles for H2A.Z and its acetylation in GAL1 transcription and gene induction, but not GAL1-transcriptional memory. PLoS Biol 2010; 8:e1000401. [PMID: 20582323 PMCID: PMC2889906 DOI: 10.1371/journal.pbio.1000401] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2010] [Accepted: 05/13/2010] [Indexed: 12/23/2022] Open
Abstract
H2A.Z does not appear to have a role in GAL1 transcriptional memory, but it does have both acetylation-dependent and acetylation-independent roles in GAL1 induction and expression. H2A.Z is a histone H2A variant conserved from yeast to humans, and is found at 63% of promoters in Saccharomyces cerevisiae. This pattern of localization suggests that H2A.Z is somehow important for gene expression or regulation. H2A.Z can be acetylated at up to four lysine residues on its amino-terminal tail, and acetylated-H2A.Z is enriched in chromatin containing promoters of active genes. We investigated whether H2A.Z's role in GAL1 gene regulation and gene expression depends on H2A.Z acetylation. Our findings suggested that H2A.Z functioned both in gene regulation and in gene expression and that only its role in gene regulation depended upon its acetylation. Our findings provided an alternate explanation for results that were previously interpreted as evidence that H2A.Z plays a role in GAL1 transcriptional memory. Additionally, our findings provided new insights into the phenotypes of htz1Δ mutants: in the absence of H2A.Z, the SWR1 complex, which deposits H2A.Z into chromatin, was deleterious to the cell, and many of the phenotypes of cells lacking H2A.Z were due to the SWR1 complex's activity rather than to the absence of H2A.Z per se. These results highlight the need to reevaluate all studies on the phenotypes of cells lacking H2A.Z. Transcriptional memory is the well-documented phenomenon by which cells can “remember” prior transcriptional states. A paradigmatic example of transcriptional memory is found in the yeast Saccharomyces. S. cerevisiae remembers prior transcription of the galactose metabolism gene GAL1. When a gene is transcribed, the DNA must first be at least partially relieved of its packaging into chromatin by histone proteins. Previous research had suggested that S. cerevisiae used a chromatin modification, the incorporation of the histone variant H2A.Z into the region surrounding the GAL1 promoter, to remember the previous status of GAL1 transcription. Not all H2A.Z molecules are the same, however. For example, it has recently been discovered that H2A.Z can be acetylated on the four lysine residues in its N-terminal tail region. In an attempt to determine whether H2A.Z acetylation is required for GAL1 transcriptional memory, we unexpectedly discovered that, although both H2A.Z and H2A.Z acetylation are important for strong and rapid GAL1 induction, neither H2A.Z nor H2A.Z acetylation plays an important role in GAL1 transcriptional memory. We propose that the discrepancy between our conclusions and those in prior publications arise from the prior analysis of insufficiently short periods of GAL1 induction or from complications arising from the comparison of the phenotypes of wild-type yeast strains to those of htz1Δ mutants (carrying the null mutation of the gene encoding H2A.Z) mutants. In the current work we show that the htz1Δ mutant's phenotype does not simply reflect the absence of H2A.Z in chromatin but instead also reflects the pleiotropic effects of the Swr1 chromatin remodeling complex that is responsible for H2A.Z deposition into chromatin. In the absence of H2A.Z the Swr1 complex itself causes cell damage. In this paper we show that swr1Δ htz1Δ double mutants have substantially less severe mutant phenotypes than htz1Δ mutants. Thus, studies using the swr1Δ htz1Δ mutant offer more detailed insight into the consequences of the absence of H2A.Z in chromatin than do studies performed on single htz1Δ mutants, and our results help to clarify the role of H2A.Z in the regulation of GAL1 induction and transcriptional memory.
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Affiliation(s)
- Jeffrey E. Halley
- Department of Molecular and Cell Biology, and California Institute for Quantitative Biosciences, University of California Berkeley, Berkeley, California, United States
| | - Tommy Kaplan
- Department of Molecular and Cell Biology, and California Institute for Quantitative Biosciences, University of California Berkeley, Berkeley, California, United States
| | - Alice Y. Wang
- Center for Molecular Medicine and Therapeutics, University of British Columbia, Vancouver, British Columbia, Canada
| | - Michael S. Kobor
- Center for Molecular Medicine and Therapeutics, University of British Columbia, Vancouver, British Columbia, Canada
| | - Jasper Rine
- Department of Molecular and Cell Biology, and California Institute for Quantitative Biosciences, University of California Berkeley, Berkeley, California, United States
- * E-mail:
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205
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Mattera L, Courilleau C, Legube G, Ueda T, Fukunaga R, Chevillard-Briet M, Canitrot Y, Escaffit F, Trouche D. The E1A-associated p400 protein modulates cell fate decisions by the regulation of ROS homeostasis. PLoS Genet 2010; 6:e1000983. [PMID: 20548951 PMCID: PMC2883595 DOI: 10.1371/journal.pgen.1000983] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2009] [Accepted: 05/12/2010] [Indexed: 12/01/2022] Open
Abstract
The p400 E1A-associated protein, which mediates H2A.Z incorporation at specific promoters, plays a major role in cell fate decisions: it promotes cell cycle progression and inhibits induction of apoptosis or senescence. Here, we show that p400 expression is required for the correct control of ROS metabolism. Depletion of p400 indeed increases intracellular ROS levels and causes the appearance of DNA damage, indicating that p400 maintains oxidative stress below a threshold at which DNA damages occur. Suppression of the DNA damage response using a siRNA against ATM inhibits the effects of p400 on cell cycle progression, apoptosis, or senescence, demonstrating the importance of ATM–dependent DDR pathways in cell fates control by p400. Finally, we show that these effects of p400 are dependent on direct transcriptional regulation of specific promoters and may also involve a positive feedback loop between oxidative stress and DNA breaks since we found that persistent DNA breaks are sufficient to increase ROS levels. Altogether, our results uncover an unexpected link between p400 and ROS metabolism and allow deciphering the molecular mechanisms largely responsible for cell proliferation control by p400. External or internal causes can lead to the generation of oxidative stress in mammalian cells. This oxidative stress is detrimental to cell life since it can induce protein damages or, even worse, DNA damages. Thus, cells have to control strictly oxidative stress levels. In this manuscript, we show that the p400 ATPase, a chaperone of specific histone H2A variants, is important for this control in mammals and therefore prevents DNA damage induction. Moreover, we demonstrate that the known roles of p400 in cell proliferation are dependent upon its effect on oxidative stress. Finally, we identify the mechanisms by which p400 modulates oxidative stress levels. Altogether, our study uncovers a new role of mammalian p400 and demonstrates its functional importance.
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Affiliation(s)
- Lise Mattera
- Laboratoire de Biologie Cellulaire et Moléculaire du Contrôle de la Prolifération (LBCMCP), CNRS and Université de Toulouse, Toulouse, France
| | - Céline Courilleau
- Laboratoire de Biologie Cellulaire et Moléculaire du Contrôle de la Prolifération (LBCMCP), CNRS and Université de Toulouse, Toulouse, France
| | - Gaëlle Legube
- Laboratoire de Biologie Cellulaire et Moléculaire du Contrôle de la Prolifération (LBCMCP), CNRS and Université de Toulouse, Toulouse, France
| | - Takeshi Ueda
- Campbell Family Institute for Breast Cancer Research, Princess Margaret Hospital, Toronto, Canada
| | - Rikiro Fukunaga
- Department of Medical Chemistry, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Martine Chevillard-Briet
- Laboratoire de Biologie Cellulaire et Moléculaire du Contrôle de la Prolifération (LBCMCP), CNRS and Université de Toulouse, Toulouse, France
| | - Yvan Canitrot
- Laboratoire de Biologie Cellulaire et Moléculaire du Contrôle de la Prolifération (LBCMCP), CNRS and Université de Toulouse, Toulouse, France
| | - Fabrice Escaffit
- Laboratoire de Biologie Cellulaire et Moléculaire du Contrôle de la Prolifération (LBCMCP), CNRS and Université de Toulouse, Toulouse, France
| | - Didier Trouche
- Laboratoire de Biologie Cellulaire et Moléculaire du Contrôle de la Prolifération (LBCMCP), CNRS and Université de Toulouse, Toulouse, France
- * E-mail:
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206
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Mattiazzi M, Jambhekar A, Kaferle P, DeRisi JL, Križaj I, Petrovič U. Genetic interactions between a phospholipase A2 and the Rim101 pathway components in S. cerevisiae reveal a role for this pathway in response to changes in membrane composition and shape. Mol Genet Genomics 2010; 283:519-30. [PMID: 20379744 PMCID: PMC2872012 DOI: 10.1007/s00438-010-0533-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2009] [Accepted: 03/11/2010] [Indexed: 02/06/2023]
Abstract
Modulating composition and shape of biological membranes is an emerging mode of regulation of cellular processes. We investigated the global effects that such perturbations have on a model eukaryotic cell. Phospholipases A(2) (PLA(2)s), enzymes that cleave one fatty acid molecule from membrane phospholipids, exert their biological activities through affecting both membrane composition and shape. We have conducted a genome-wide analysis of cellular effects of a PLA(2) in the yeast Saccharomyces cerevisiae as a model system. We demonstrate functional genetic and biochemical interactions between PLA(2) activity and the Rim101 signaling pathway in S. cerevisiae. Our results suggest that the composition and/or the shape of the endosomal membrane affect the Rim101 pathway. We describe a genetically and functionally related network, consisting of components of the Rim101 pathway and the prefoldin, retromer and SWR1 complexes, and predict its functional relation to PLA(2) activity in a model eukaryotic cell. This study provides a list of the players involved in the global response to changes in membrane composition and shape in a model eukaryotic cell, and further studies are needed to understand the precise molecular mechanisms connecting them.
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Affiliation(s)
- M. Mattiazzi
- Department of Molecular and Biomedical Sciences, Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
| | - A. Jambhekar
- David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA USA
- Present Address: Departments of Genetics and Molecular Biology, Massachusetts General Hospital, Harvard Medical School, Boston, MA USA
| | - P. Kaferle
- Department of Molecular and Biomedical Sciences, Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
| | - J. L. DeRisi
- Department of Biochemistry and Biophysics and Howard Hughes Medical Institute, University of California San Francisco, San Francisco, CA USA
| | - I. Križaj
- Department of Molecular and Biomedical Sciences, Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
| | - U. Petrovič
- Department of Molecular and Biomedical Sciences, Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
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207
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Burgio G, Onorati MC, Corona DFV. Chromatin remodeling regulation by small molecules and metabolites. BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS 2010; 1799:671-80. [PMID: 20493981 DOI: 10.1016/j.bbagrm.2010.05.007] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2010] [Accepted: 05/08/2010] [Indexed: 10/19/2022]
Abstract
The eukaryotic genome is a highly organized nucleoprotein structure comprising of DNA, histones, non-histone proteins, and RNAs, referred to as chromatin. The chromatin exists as a dynamic entity, shuttling between the open and closed forms at specific nuclear regions and loci based on the requirement of the cell. This dynamicity is essential for the various DNA-templated phenomena like transcription, replication, and repair and is achieved through the activity of ATP-dependent chromatin remodeling complexes and covalent modifiers of chromatin. A growing body of data indicates that chromatin enzymatic activities are finely and specifically regulated by a variety of small molecules derived from the intermediary metabolism. This review tries to summarize the work conducted in many laboratories and on different model organisms showing how ATP-dependent chromatin remodeling complexes are regulated by small molecules and metabolites such as adenosine triphosphate (ATP), acetyl coenzyme A (AcCoA), S-adenosyl methionine (SAM), nicotinamide adenine dinucleotide (NAD), and inositol polyphosphates (IPs).
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Affiliation(s)
- Giosalba Burgio
- Dipartimento di Biologia Cellulare e dello Sviluppo, Università degli Studi di Palermo, 90100 Palermo, Italy
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208
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Novel functional residues in the core domain of histone H2B regulate yeast gene expression and silencing and affect the response to DNA damage. Mol Cell Biol 2010; 30:3503-18. [PMID: 20479120 DOI: 10.1128/mcb.00290-10] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Previous studies have identified novel modifications in the core fold domain of histone H2B, but relatively little is known about the function of these putative histone modification sites. We have mutated core modifiable residues that are conserved in Saccharomyces cerevisiae histone H2B and characterized the effects of the mutants on yeast silencing, gene expression, and the DNA damage response. We identified three histone H2B core modifiable residues as functionally important. We find that mutating H2B K49 in yeast confers a UV sensitivity phenotype, and we confirm that the homologous residue in human histone H2B is acetylated and methylated in human cells. Our results also indicate that mutating H2B K111 impairs the response to methyl methanesulfonate (MMS)-induced DNA lesions and disrupts telomeric silencing and Sir4 binding. In contrast, mutating H2B R102 enhances silencing at yeast telomeres and the HML silent mating loci and increases Sir4 binding to these regions. The H2B R102A mutant also represses the expression of endogenous genes adjacent to yeast telomeres, which is likely due to the ectopic spreading of the Sir complex in this mutant strain. We propose a structural model by which H2B R102 and K111 regulate the binding of the Sir complex to the nucleosome.
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209
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Essential role of p18Hamlet/SRCAP-mediated histone H2A.Z chromatin incorporation in muscle differentiation. EMBO J 2010; 29:2014-25. [PMID: 20473270 DOI: 10.1038/emboj.2010.85] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2009] [Accepted: 04/12/2010] [Indexed: 11/08/2022] Open
Abstract
The chromatin-remodelling complex SNF2-related CBP activator protein (SRCAP) regulates chromatin structure in yeast by modulating the exchange of histone H2A for the H2A.Z variant. Here, we have investigated the contribution of H2A.Z-mediated chromatin remodelling to mammalian cell differentiation reprogramming. We show that the SRCAP subunit named ZNHIT1 or p18(Hamlet), which is a substrate of p38 MAPK, is recruited to the myogenin promoter at the onset of muscle differentiation, in a p38 MAPK-dependent manner. We also show that p18(Hamlet) is required for H2A.Z accumulation into this genomic region and for subsequent muscle gene transcriptional activation. Accordingly, downregulation of several subunits or the SRCAP complex impairs muscle gene expression. These results identify SRCAP/H2A.Z-mediated chromatin remodelling as a key early event in muscle differentiation-specific gene expression. We also propose a mechanism by which p38 MAPK-mediated signals are converted into chromatin structural changes, thereby facilitating transcriptional activation during mammalian cell differentiation.
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210
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Venkitaraman AR. Modifying chromatin architecture during the response to DNA breakage. Crit Rev Biochem Mol Biol 2010; 45:2-13. [PMID: 19874211 DOI: 10.3109/10409230903325446] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The human genome is compacted in a dynamic macromolecular complex, chromatin, whose structure presents a considerable barrier to the cellular machinery which responds to DNA double-strand breaks. This review discusses current understanding of the processes that modify chromatin architecture to enable, first, the sensing of DNA breakage, next, the assembly of the protein complexes that resolve the lesion, and finally, the restoration of epigenetic marks after its repair. The importance of these fundamental biological processes is underscored by the growing appreciation that they are aberrant in human diseases, and that their modulation could provide new approaches to disease therapy.
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Affiliation(s)
- Ashok R Venkitaraman
- University of Cambridge, Department of Oncology & The Medical Research Council Cancer Cell Unit, Hutchison/MRC Research Centre, UK
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211
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Thakar A, Gupta P, McAllister WT, Zlatanova J. Histone Variant H2A.Z Inhibits Transcription in Reconstituted Nucleosomes. Biochemistry 2010; 49:4018-26. [DOI: 10.1021/bi1001618] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Amit Thakar
- Department of Molecular Biology, University of Wyoming, Laramie, Wyoming 82071
| | - Pooja Gupta
- Department of Molecular Biology, University of Wyoming, Laramie, Wyoming 82071
| | - William T. McAllister
- Department of Cell Biology, University of Medicine and Dentistry of New Jersey, Stratford, New Jersey 08084
| | - Jordanka Zlatanova
- Department of Molecular Biology, University of Wyoming, Laramie, Wyoming 82071
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212
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Cheung KLY, Huen J, Houry WA, Ortega J. Comparison of the multiple oligomeric structures observed for the Rvb1 and Rvb2 proteins. Biochem Cell Biol 2010; 88:77-88. [PMID: 20130681 DOI: 10.1139/o09-159] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
The Rvb1 and Rvb2 proteins are 2 members of the AAA+ family, involved in roles as diverse as chromatin remodeling, transcription, small nucleolar RNA maturation, cellular transformation, signaling of apoptosis and mitosis. These proteins are capable of playing a role in such diverse cellular activities because they are components of different macromolecular assemblies. In the last few years, there has been a number of groups reporting on the structure of purified Rvbs. The reported results have been rather controversial, because there are significant differences observed among the published structures in spite of the high degree of homology among these proteins. Surprisingly, contradictions are observed not only between structures representing the Rvb proteins from different species, but also between protein structures from the same species. This review describes the available Rvb structures from different species and also makes a comparative analysis of them. Finally, we identify some aspects of these structural studies worth pursuing in additional investigations to ensure that the reported structures reflect physiologically relevant conformations of the Rvb1-Rvb2 complex.
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Affiliation(s)
- Kevin L Y Cheung
- Department of Biochemistry and Biomedical Sciences, McMaster University, 1200 Main Street West, Hamilton, ON, L8N3Z5, Canada
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213
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Yoshida T, Shimada K, Oma Y, Kalck V, Akimura K, Taddei A, Iwahashi H, Kugou K, Ohta K, Gasser SM, Harata M. Actin-related protein Arp6 influences H2A.Z-dependent and -independent gene expression and links ribosomal protein genes to nuclear pores. PLoS Genet 2010; 6:e1000910. [PMID: 20419146 PMCID: PMC2855322 DOI: 10.1371/journal.pgen.1000910] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2009] [Accepted: 03/16/2010] [Indexed: 11/19/2022] Open
Abstract
Actin-related proteins are ubiquitous components of chromatin remodelers and are conserved from yeast to man. We have examined the role of the budding yeast actin-related protein Arp6 in gene expression, both as a component of the SWR1 complex (SWR-C) and in its absence. We mapped Arp6 binding sites along four yeast chromosomes using chromatin immunoprecipitation from wild-type and swr1 deleted (swr1Delta) cells. We find that a majority of Arp6 binding sites coincide with binding sites of Swr1, the catalytic subunit of SWR-C, and with the histone H2A variant Htz1 (H2A.Z) deposited by SWR-C. However, Arp6 binding detected at centromeres, the promoters of ribosomal protein (RP) genes, and some telomeres is independent of Swr1 and Htz1 deposition. Given that RP genes and telomeres both show association with the nuclear periphery, we monitored the ability of Arp6 to mediate the localization of chromatin to nuclear pores. Arp6 binding is sufficient to shift a randomly positioned locus to nuclear periphery, even in a swr1Delta strain. Arp6 is also necessary for the pore association of its targeted RP promoters possibly through cell cycle-dependent factors. Loss of Arp6, but not Htz1, leads to an up-regulation of these RP genes. In contrast, the pore-association of GAL1 correlates with Htz1 deposition, and loss of Arp6 reduces both GAL1 activation and peripheral localization. We conclude that Arp6 functions both together with the nucleosome remodeler Swr1 and also without it, to mediate Htz1-dependent and Htz1-independent binding of chromatin domains to nuclear pores. This association is shown to have modulating effects on gene expression.
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Affiliation(s)
- Takahito Yoshida
- Laboratory of Molecular Biology, Graduate School of Agricultural Science, Tohoku University, Sendai, Japan
| | - Kenji Shimada
- Friedrich Miescher Institute for Biomedical Research, Basel, Switzerland
| | - Yukako Oma
- Laboratory of Molecular Biology, Graduate School of Agricultural Science, Tohoku University, Sendai, Japan
| | - Véronique Kalck
- Friedrich Miescher Institute for Biomedical Research, Basel, Switzerland
| | - Kazumi Akimura
- Laboratory of Molecular Biology, Graduate School of Agricultural Science, Tohoku University, Sendai, Japan
| | - Angela Taddei
- Friedrich Miescher Institute for Biomedical Research, Basel, Switzerland
- Centre National de la Recherche Scientifique/Institut Curie-Section de Recherche, Paris, France
| | - Hitoshi Iwahashi
- Human Stress Signal Research Center, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki, Japan
| | - Kazuto Kugou
- Shibata Distinguished Senior Laboratory, RIKEN Discovery Research Institute, Wako, Saitama, Japan
- Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Tokyo, Japan
| | - Kunihiro Ohta
- Shibata Distinguished Senior Laboratory, RIKEN Discovery Research Institute, Wako, Saitama, Japan
- Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Tokyo, Japan
| | - Susan M. Gasser
- Friedrich Miescher Institute for Biomedical Research, Basel, Switzerland
| | - Masahiko Harata
- Laboratory of Molecular Biology, Graduate School of Agricultural Science, Tohoku University, Sendai, Japan
- * E-mail:
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Altaf M, Auger A, Monnet-Saksouk J, Brodeur J, Piquet S, Cramet M, Bouchard N, Lacoste N, Utley RT, Gaudreau L, Côté J. NuA4-dependent acetylation of nucleosomal histones H4 and H2A directly stimulates incorporation of H2A.Z by the SWR1 complex. J Biol Chem 2010; 285:15966-77. [PMID: 20332092 DOI: 10.1074/jbc.m110.117069] [Citation(s) in RCA: 127] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Structural and functional analyses of nucleosomes containing histone variant H2A.Z have drawn a lot of interest over the past few years. Important work in budding yeast has shown that H2A.Z (Htz1)-containing nucleosomes are specifically located on the promoter regions of genes, creating a specific chromatin structure that is poised for disassembly during transcription activation. The SWR1 complex is responsible for incorporation of Htz1 into nucleosomes through ATP-dependent exchange of canonical H2A-H2B dimers for Htz1-H2B dimers. Interestingly, the yeast SWR1 complex is functionally linked to the NuA4 acetyltransferase complex in vivo. NuA4 and SWR1 are physically associated in higher eukaryotes as they are homologous to the TIP60/p400 complex, which encompasses both histone acetyltransferase (Tip60) and histone exchange (p400/Domino) activities. Here we present work investigating the impact of NuA4-dependent acetylation on SWR1-driven incorporation of H2A.Z into chromatin. Using in vitro histone exchange assays with native chromatin, we demonstrate that prior chromatin acetylation by NuA4 greatly stimulates the exchange of H2A for H2A.Z. Interestingly, we find that acetylation of H2A or H4 N-terminal tails by NuA4 can independently stimulate SWR1 activity. Accordingly, we demonstrate that mutations of H4 or H2A N-terminal lysine residues have similar effects on H2A.Z incorporation in vivo, and cells carrying mutations in both tails are nonviable. Finally, depletion experiments indicate that the bromodomain-containing protein Bdf1 is important for NuA4-dependent stimulation of SWR1. These results provide important mechanistic insight into the functional cross-talk between chromatin acetylation and ATP-dependent exchange of histone H2A variants.
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Affiliation(s)
- Mohammed Altaf
- Laval University Cancer Research Center, Hôtel-Dieu de Québec, CHUQ, Quebec City, Quebec G1R 2J6, Canada
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215
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Dalvai M, Bystricky K. The role of histone modifications and variants in regulating gene expression in breast cancer. J Mammary Gland Biol Neoplasia 2010; 15:19-33. [PMID: 20131086 DOI: 10.1007/s10911-010-9167-z] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/07/2009] [Accepted: 01/08/2010] [Indexed: 02/03/2023] Open
Abstract
The role of epigenetic phenomena in cancer biology is increasingly being recognized. Here we focus on the mechanisms and enzymes involved in regulating histone methylation and acetylation, and the modulation of histone variant expression and deposition. Implications of these epigenetic marks for tumor development, progression and invasiveness are discussed with a particular emphasis on breast cancer progression.
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Affiliation(s)
- Mathieu Dalvai
- Université de Toulouse, LBME, 118 route de Narbonne, 31062, Toulouse, France.
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216
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Huen J, Kakihara Y, Ugwu F, Cheung KLY, Ortega J, Houry WA. Rvb1–Rvb2: essential ATP-dependent helicases for critical complexesThis paper is one of a selection of papers published in this special issue entitled 8th International Conference on AAA Proteins and has undergone the Journal's usual peer review process. Biochem Cell Biol 2010; 88:29-40. [DOI: 10.1139/o09-122] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Rvb1 and Rvb2 are highly conserved, essential AAA+ helicases found in a wide range of eukaryotes. The versatility of these helicases and their central role in the biology of the cell is evident from their involvement in a wide array of critical cellular complexes. Rvb1 and Rvb2 are components of the chromatin-remodeling complexes INO80, Swr-C, and BAF. They are also members of the histone acetyltransferase Tip60 complex, and the recently identified R2TP complex present in Saccharomyces cerevisiae and Homo sapiens; a complex that is involved in small nucleolar ribonucleoprotein (snoRNP) assembly. Furthermore, in humans, Rvb1 and Rvb2 have been identified in the URI prefoldin-like complex. In Drosophila, the Polycomb Repressive complex 1 contains Rvb2, but not Rvb1, and the Brahma complex contains Rvb1 and not Rvb2. Both of these complexes are involved in the regulation of growth and development genes in Drosophila. Rvbs are therefore crucial factors in various cellular processes. Their importance in chromatin remodeling, transcription regulation, DNA damage repair, telomerase assembly, mitotic spindle formation, and snoRNP biogenesis is discussed in this review.
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Affiliation(s)
- Jennifer Huen
- Department of Biochemistry, University of Toronto, Toronto, ON, M5S 1A8, Canada
- Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, ON, L8N 3Z5, Canada
| | - Yoshito Kakihara
- Department of Biochemistry, University of Toronto, Toronto, ON, M5S 1A8, Canada
- Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, ON, L8N 3Z5, Canada
| | - Francisca Ugwu
- Department of Biochemistry, University of Toronto, Toronto, ON, M5S 1A8, Canada
- Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, ON, L8N 3Z5, Canada
| | - Kevin L. Y. Cheung
- Department of Biochemistry, University of Toronto, Toronto, ON, M5S 1A8, Canada
- Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, ON, L8N 3Z5, Canada
| | - Joaquin Ortega
- Department of Biochemistry, University of Toronto, Toronto, ON, M5S 1A8, Canada
- Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, ON, L8N 3Z5, Canada
| | - Walid A. Houry
- Department of Biochemistry, University of Toronto, Toronto, ON, M5S 1A8, Canada
- Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, ON, L8N 3Z5, Canada
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217
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Hou H, Wang Y, Kallgren SP, Thompson J, Yates JR, Jia S. Histone variant H2A.Z regulates centromere silencing and chromosome segregation in fission yeast. J Biol Chem 2010; 285:1909-18. [PMID: 19910462 PMCID: PMC2804349 DOI: 10.1074/jbc.m109.058487] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2009] [Revised: 11/12/2009] [Indexed: 11/06/2022] Open
Abstract
The incorporation of histone variant H2A.Z into nucleosomes plays essential roles in regulating chromatin structure and gene expression. A multisubunit complex containing chromatin remodeling protein Swr1 is responsible for the deposition of H2A.Z in budding yeast and mammals. Here, we show that the JmjC domain protein Msc1 is a novel component of the fission yeast Swr1 complex and is required for Swr1-mediated incorporation of H2A.Z into nucleosomes at gene promoters. Loss of Msc1, Swr1, or H2A.Z results in loss of silencing at centromeres and defective chromosome segregation, although centromeric levels of CENP-A, a centromere-specific histone H3 variant that is required for setting up the chromatin structure at centromeres, remain unchanged. Intriguingly, H2A.Z is required for the expression of another centromere protein, CENP-C, and overexpression of CENP-C rescues centromere silencing defects associated with H2A.Z loss. These results demonstrate the importance of H2A.Z and CENP-C in maintaining a silenced chromatin state at centromeres.
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Affiliation(s)
- Haitong Hou
- From the Department of Biological Sciences, Columbia University, New York, New York 10027 and
| | - Yu Wang
- From the Department of Biological Sciences, Columbia University, New York, New York 10027 and
| | - Scott P. Kallgren
- From the Department of Biological Sciences, Columbia University, New York, New York 10027 and
| | - James Thompson
- the Department of Cell Biology, The Scripps Research Institute, La Jolla, California 92037
| | - John R. Yates
- the Department of Cell Biology, The Scripps Research Institute, La Jolla, California 92037
| | - Songtao Jia
- From the Department of Biological Sciences, Columbia University, New York, New York 10027 and
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218
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Awad S, Ryan D, Prochasson P, Owen-Hughes T, Hassan AH. The Snf2 homolog Fun30 acts as a homodimeric ATP-dependent chromatin-remodeling enzyme. J Biol Chem 2010; 285:9477-9484. [PMID: 20075079 PMCID: PMC2843198 DOI: 10.1074/jbc.m109.082149] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
The Saccharomyces cerevisiae Fun30 (Function unknown now 30) protein shares homology with an extended family of Snf2-related ATPases. Here we report the purification of Fun30 principally as a homodimer with a molecular mass of about 250 kDa. Biochemical characterization of this complex reveals that it has ATPase activity stimulated by both DNA and chromatin. Consistent with this, it also binds to both DNA and chromatin. The Fun30 complex also exhibits activity in ATP-dependent chromatin remodeling assays. Interestingly, its activity in histone dimer exchange is high relative to the ability to reposition nucleosomes. Fun30 also possesses a weakly conserved CUE motif suggesting that it may interact specifically with ubiquitinylated proteins. However, in vitro Fun30 was found to have no specificity in its interaction with ubiquitinylated histones.
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Affiliation(s)
- Salma Awad
- Department of Biochemistry, Faculty of Medicine and Health Sciences, United Arab Emirates University, P.O. Box 17666, Al-Ain, United Arab Emirates; Wellcome Trust Centre for Gene Regulation and Expression, School of Life Sciences, University of Dundee, Dundee DD1 5EH, Scotland, United Kingdom
| | - Daniel Ryan
- Wellcome Trust Centre for Gene Regulation and Expression, School of Life Sciences, University of Dundee, Dundee DD1 5EH, Scotland, United Kingdom
| | | | - Tom Owen-Hughes
- Wellcome Trust Centre for Gene Regulation and Expression, School of Life Sciences, University of Dundee, Dundee DD1 5EH, Scotland, United Kingdom
| | - Ahmed H Hassan
- Department of Biochemistry, Faculty of Medicine and Health Sciences, United Arab Emirates University, P.O. Box 17666, Al-Ain, United Arab Emirates.
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219
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Kumar SV, Wigge PA. H2A.Z-Containing Nucleosomes Mediate the Thermosensory Response in Arabidopsis. Cell 2010; 140:136-47. [DOI: 10.1016/j.cell.2009.11.006] [Citation(s) in RCA: 687] [Impact Index Per Article: 49.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2009] [Revised: 09/14/2009] [Accepted: 11/03/2009] [Indexed: 01/17/2023]
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220
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Conde-Pueyo N, Munteanu A, Solé RV, Rodríguez-Caso C. Human synthetic lethal inference as potential anti-cancer target gene detection. BMC SYSTEMS BIOLOGY 2009; 3:116. [PMID: 20015360 PMCID: PMC2804737 DOI: 10.1186/1752-0509-3-116] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/24/2009] [Accepted: 12/16/2009] [Indexed: 12/17/2022]
Abstract
Background Two genes are called synthetic lethal (SL) if mutation of either alone is not lethal, but mutation of both leads to death or a significant decrease in organism's fitness. The detection of SL gene pairs constitutes a promising alternative for anti-cancer therapy. As cancer cells exhibit a large number of mutations, the identification of these mutated genes' SL partners may provide specific anti-cancer drug candidates, with minor perturbations to the healthy cells. Since existent SL data is mainly restricted to yeast screenings, the road towards human SL candidates is limited to inference methods. Results In the present work, we use phylogenetic analysis and database manipulation (BioGRID for interactions, Ensembl and NCBI for homology, Gene Ontology for GO attributes) in order to reconstruct the phylogenetically-inferred SL gene network for human. In addition, available data on cancer mutated genes (COSMIC and Cancer Gene Census databases) as well as on existent approved drugs (DrugBank database) supports our selection of cancer-therapy candidates. Conclusions Our work provides a complementary alternative to the current methods for drug discovering and gene target identification in anti-cancer research. Novel SL screening analysis and the use of highly curated databases would contribute to improve the results of this methodology.
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Affiliation(s)
- Nuria Conde-Pueyo
- ICREA-Complex Systems Lab, Universitat Pompeu Fabra, Parc de Recerca Biomedica de Barcelona, Dr Aiguader 88, E-08003 Barcelona, Spain.
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221
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Wan Y, Chiang JH, Lin CH, Arens CE, Saleem RA, Smith JJ, Aitchison JD. Histone chaperone Chz1p regulates H2B ubiquitination and subtelomeric anti-silencing. Nucleic Acids Res 2009; 38:1431-40. [PMID: 20008511 PMCID: PMC2836552 DOI: 10.1093/nar/gkp1099] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Chz1p is a histone chaperone that interacts physically and functionally with the histone variant Htz1p, which has been implicated in establishing and maintaining boundaries between transcriptionally inactive heterochromatin and active euchromatin. To investigate the role of Chz1p in chromatin organization, we performed genome-wide expression arrays and chromatin immunoprecipitations of SIR complex components and modified histones in a CHZ1 deletion strain. Deletion of CHZ1 led to reduced ubiquitination of subtelomere-associated H2B, reduced subtelomeric H3K79 di-methylation, and increased binding of Sir3p, and Sir4p at telomere-distal euchromatin regions, correlating with decreased gene expression in subtelomeric regions. This anti-silencing defect appears to be mediated by enhanced association of de-ubiquitinase Ubp10p with subtelomeric DNA, as detected by chromatin immunoprecipitation analysis. In support of this, we show that deletion of UBP10 can antagonize the subtelomeric silencing phenotype of Δchz1. Taken together, the results demonstrate a novel role for Chz1p in epigenetic regulation, through H2B de-ubiquitination by Ubp10p.
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Affiliation(s)
- Yakun Wan
- Institute for Systems Biology, Seattle, WA 98103, USA
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222
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Ulitsky I, Krogan NJ, Shamir R. Towards accurate imputation of quantitative genetic interactions. Genome Biol 2009; 10:R140. [PMID: 20003301 PMCID: PMC2812947 DOI: 10.1186/gb-2009-10-12-r140] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2009] [Revised: 11/08/2009] [Accepted: 12/10/2009] [Indexed: 12/25/2022] Open
Abstract
A new method for calculating quantitative genetic interactions allows for the inference of 190,000 new genetic interactions in Saccharomyces cerevisae. Recent technological breakthroughs have enabled high-throughput quantitative measurements of hundreds of thousands of genetic interactions among hundreds of genes in Saccharomyces cerevisiae. However, these assays often fail to measure the genetic interactions among up to 40% of the studied gene pairs. Here we present a novel method, which combines genetic interaction data together with diverse genomic data, to quantitatively impute these missing interactions. We also present data on almost 190,000 novel interactions.
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Affiliation(s)
- Igor Ulitsky
- Blavatnik School of Computer Science, Tel Aviv University, Tel Aviv 69978, Israel.
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223
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Malik S, Chaurasia P, Lahudkar S, Durairaj G, Shukla A, Bhaumik SR. Rad26p, a transcription-coupled repair factor, is recruited to the site of DNA lesion in an elongating RNA polymerase II-dependent manner in vivo. Nucleic Acids Res 2009; 38:1461-77. [PMID: 20007604 PMCID: PMC2836574 DOI: 10.1093/nar/gkp1147] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Rad26p, a yeast homologue of human Cockayne syndrome B with an ATPase activity, plays a pivotal role in stimulating DNA repair at the coding sequences of active genes. On the other hand, DNA repair at inactive genes or silent areas of the genome is not regulated by Rad26p. However, how Rad26p recognizes DNA lesions at the actively transcribing genes to facilitate DNA repair is not clearly understood in vivo. Here, we show that Rad26p associates with the coding sequences of genes in a transcription-dependent manner, but independently of DNA lesions induced by 4-nitroquinoline-1-oxide in Saccharomyces cerevisiae. Further, histone H3 lysine 36 methylation that occurs at the active coding sequence stimulates the recruitment of Rad26p. Intriguingly, we find that Rad26p is recruited to the site of DNA lesion in an elongating RNA polymerase II-dependent manner. However, Rad26p does not recognize DNA lesions in the absence of active transcription. Together, these results provide an important insight as to how Rad26p is delivered to the damage sites at the active, but not inactive, genes to stimulate repair in vivo, shedding much light on the early steps of transcription-coupled repair in living eukaryotic cells.
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Affiliation(s)
- Shivani Malik
- Department of Biochemistry and Molecular Biology, Southern Illinois University School of Medicine, 1245 Lincoln Drive, Carbondale, IL-62901, USA
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224
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Asf1-like structure of the conserved Yaf9 YEATS domain and role in H2A.Z deposition and acetylation. Proc Natl Acad Sci U S A 2009; 106:21573-8. [PMID: 19966225 DOI: 10.1073/pnas.0906539106] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Chromatin can be modified by posttranslational modifications of histones, ATP-dependent remodeling, and incorporation of histone variants. The Saccharomyces cerevisiae protein Yaf9 is a subunit of both the essential histone acetyltransferase complex NuA4 and the ATP-dependent chromatin remodeling complex SWR1-C, which deposits histone variant H2A.Z into euchromatin. Yaf9 contains a YEATS domain, found in proteins associated with multiple chromatin-modifying enzymes and transcription complexes across eukaryotes. Here, we established the conservation of YEATS domain function from yeast to human, and determined the structure of this region from Yaf9 by x-ray crystallography to 2.3 A resolution. The Yaf9 YEATS domain consisted of a beta-sandwich characteristic of the Ig fold and contained three distinct conserved structural features. The structure of the Yaf9 YEATS domain was highly similar to that of the histone chaperone Asf1, a similarity that extended to an ability of Yaf9 to bind histones H3 and H4 in vitro. Using structure-function analysis, we found that the YEATS domain was required for Yaf9 function, histone variant H2A.Z chromatin deposition at specific promoters, and H2A.Z acetylation.
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225
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Loney ER, Inglis PW, Sharp S, Pryde FE, Kent NA, Mellor J, Louis EJ. Repressive and non-repressive chromatin at native telomeres in Saccharomyces cerevisiae. Epigenetics Chromatin 2009; 2:18. [PMID: 19954519 PMCID: PMC3225887 DOI: 10.1186/1756-8935-2-18] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2009] [Accepted: 12/02/2009] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND In Saccharomyces cerevisiae genes that are located close to a telomere can become transcriptionally repressed by an epigenetic process known as telomere position effect. There is large variation in the level of the telomere position effect among telomeres, with many native ends exhibiting little repression. RESULTS Chromatin analysis, using microccocal nuclease and indirect end labelling, reveals distinct patterns for ends with different silencing states. Differences were observed in the promoter accessibility of a subtelomeric reporter gene and a characteristic array of phased nucleosomes was observed on the centromere proximal side of core X at a repressive end. The silent information regulator proteins 2 - 4, the yKu heterodimer and the subtelomeric core X element are all required for the maintenance of the chromatin structure of repressive ends. However, gene deletions of particular histone modification proteins can eliminate the silencing without the disruption of this chromatin structure. CONCLUSION Our data identifies chromatin features that correlate with the silencing state and indicate that an array of phased nucleosomes is not sufficient for full repression.
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Affiliation(s)
- Esther R Loney
- 1Department of Oncology, University of Western Ontario, Ontario, Canada.
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226
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Abstract
Operons (clusters of co-regulated genes with related functions) are common features of bacterial genomes. More recently, functional gene clustering has been reported in eukaryotes, from yeasts to filamentous fungi, plants, and animals. Gene clusters can consist of paralogous genes that have most likely arisen by gene duplication. However, there are now many examples of eukaryotic gene clusters that contain functionally related but non-homologous genes and that represent functional gene organizations with operon-like features (physical clustering and co-regulation). These include gene clusters for use of different carbon and nitrogen sources in yeasts, for production of antibiotics, toxins, and virulence determinants in filamentous fungi, for production of defense compounds in plants, and for innate and adaptive immunity in animals (the major histocompatibility locus). The aim of this article is to review features of functional gene clusters in prokaryotes and eukaryotes and the significance of clustering for effective function.
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Affiliation(s)
- Anne E Osbourn
- Department of Metabolic Biology, John Innes Centre, Colney Lane, Norwich NR4 7UH, UK.
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227
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Kim HS, Vanoosthuyse V, Fillingham J, Roguev A, Watt S, Kislinger T, Treyer A, Carpenter LR, Bennett CS, Emili A, Greenblatt JF, Hardwick KG, Krogan NJ, Bähler J, Keogh MC. An acetylated form of histone H2A.Z regulates chromosome architecture in Schizosaccharomyces pombe. Nat Struct Mol Biol 2009; 16:1286-93. [PMID: 19915592 PMCID: PMC2788674 DOI: 10.1038/nsmb.1688] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2009] [Accepted: 09/10/2009] [Indexed: 12/31/2022]
Abstract
Histone variant H2A.Z has a conserved role in genome stability, although it remains unclear how this is mediated. Here we demonstrate that the fission yeast Swr1 ATPase inserts H2A.Z (Pht1) into chromatin and Kat5 acetyltransferase (Mst1) acetylates it. Deletion or an unacetylatable mutation of Pht1 leads to genome instability, primarily caused by chromosome entanglement and breakage at anaphase. This leads to the loss of telomere-proximal markers, though telomere protection and repeat length are unaffected by the absence of Pht1. Strikingly, the chromosome entanglement in pht1Delta anaphase cells can be rescued by forcing chromosome condensation before anaphase onset. We show that the condensin complex, required for the maintenance of anaphase chromosome condensation, prematurely dissociates from chromatin in the absence of Pht1. This and other findings suggest an important role for H2A.Z in the architecture of anaphase chromosomes.
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Affiliation(s)
- Hyun-Soo Kim
- Department of Cell Biology, Albert Einstein College of Medicine, New York, New York, USA
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228
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Fission yeast Iec1-ino80-mediated nucleosome eviction regulates nucleotide and phosphate metabolism. Mol Cell Biol 2009; 30:657-74. [PMID: 19933844 DOI: 10.1128/mcb.01117-09] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Ino80 is an ATP-dependent nucleosome-remodeling enzyme involved in transcription, replication, and the DNA damage response. Here, we characterize the fission yeast Ino80 and find that it is essential for cell viability. We show that the Ino80 complex from fission yeast mediates ATP-dependent nucleosome remodeling in vitro. The purification of the Ino80-associated complex identified a highly conserved complex and the presence of a novel zinc finger protein with similarities to the mammalian transcriptional regulator Yin Yang 1 (YY1) and other members of the GLI-Krüppel family of proteins. Deletion of this Iec1 protein or the Ino80 complex subunit arp8, ies6, or ies2 causes defects in DNA damage repair, the response to replication stress, and nucleotide metabolism. We show that Iec1 is important for the correct expression of genes involved in nucleotide metabolism, including the ribonucleotide reductase subunit cdc22 and phosphate- and adenine-responsive genes. We find that Ino80 is recruited to a large number of promoter regions on phosphate starvation, including those of phosphate- and adenine-responsive genes that depend on Iec1 for correct expression. Iec1 is required for the binding of Ino80 to target genes and subsequent histone loss at the promoter and throughout the body of these genes on phosphate starvation. This suggests that the Iec1-Ino80 complex promotes transcription through nucleosome eviction.
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229
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Buchanan L, Durand-Dubief M, Roguev A, Sakalar C, Wilhelm B, Strålfors A, Shevchenko A, Aasland R, Shevchenko A, Ekwall K, Francis Stewart A. The Schizosaccharomyces pombe JmjC-protein, Msc1, prevents H2A.Z localization in centromeric and subtelomeric chromatin domains. PLoS Genet 2009; 5:e1000726. [PMID: 19911051 PMCID: PMC2770259 DOI: 10.1371/journal.pgen.1000726] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2009] [Accepted: 10/15/2009] [Indexed: 12/22/2022] Open
Abstract
Eukaryotic genomes are repetitively packaged into chromatin by nucleosomes, however they are regulated by the differences between nucleosomes, which establish various chromatin states. Local chromatin cues direct the inheritance and propagation of chromatin status via self-reinforcing epigenetic mechanisms. Replication-independent histone exchange could potentially perturb chromatin status if histone exchange chaperones, such as Swr1C, loaded histone variants into wrong sites. Here we show that in Schizosaccharomyces pombe, like Saccharomyces cerevisiae, Swr1C is required for loading H2A.Z into specific sites, including the promoters of lowly expressed genes. However S. pombe Swr1C has an extra subunit, Msc1, which is a JumonjiC-domain protein of the Lid/Jarid1 family. Deletion of Msc1 did not disrupt the S. pombe Swr1C or its ability to bind and load H2A.Z into euchromatin, however H2A.Z was ectopically found in the inner centromere and in subtelomeric chromatin. Normally this subtelomeric region not only lacks H2A.Z but also shows uniformly lower levels of H3K4me2, H4K5, and K12 acetylation than euchromatin and disproportionately contains the most lowly expressed genes during vegetative growth, including many meiotic-specific genes. Genes within and adjacent to subtelomeric chromatin become overexpressed in the absence of either Msc1, Swr1, or paradoxically H2A.Z itself. We also show that H2A.Z is N-terminally acetylated before, and lysine acetylated after, loading into chromatin and that it physically associates with the Nap1 histone chaperone. However, we find a negative correlation between the genomic distributions of H2A.Z and Nap1/Hrp1/Hrp3, suggesting that the Nap1 chaperones remove H2A.Z from chromatin. These data describe H2A.Z action in S. pombe and identify a new mode of chromatin surveillance and maintenance based on negative regulation of histone variant misincorporation. Chromatin is based on a repetitive structural unit called the nucleosome. However, the regulatory properties of chromatin are mediated by the differences between nucleosomes, due to post-translational modifications or the inclusion of histone variants. These differences are maintained by inheritance through cis-acting epigenetic mechanisms. Here we describe a case where the local character of chromatin is not only determined by cis-acting mechanisms but also negatively regulated in trans. The case involves loading of the histone H2A variant, H2A.Z, into chromatin. We show that H2A.Z in the yeast Schizosaccharomyces pombe is mainly found in genes at the first transcribed nucleosome and is inserted into this nucleosome by the Swr1C remodeling machine. However, Swr1C has a regulatory subunit, Msc1, which is not required for H2A.Z promoter loading but prevents H2A.Z occupancy in the inner centromere and subtelomeric regions. These two specialized regions are neither eu- nor heterochromatin and share certain characteristics, which may predispose them to the aberrant inclusion of H2A.Z and the requirement for trans regulation by Msc1.
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Affiliation(s)
- Luke Buchanan
- Genomics, BioInnovationsZentrum, Technische Universität Dresden, Dresden, Germany
- Max Planck Institute of Molecular Cell Biology and Genetics, Dresden, Germany
| | - Mickaël Durand-Dubief
- Karolinska Institute, Department of Biosciences and Medical Nutrition, NOVUM, Huddinge, Sweden
| | - Assen Roguev
- Genomics, BioInnovationsZentrum, Technische Universität Dresden, Dresden, Germany
| | - Cagri Sakalar
- Genomics, BioInnovationsZentrum, Technische Universität Dresden, Dresden, Germany
| | - Brian Wilhelm
- Research Institute for Immunology and Cancer, University of Montreal, Montreal, Quebec, Canada
| | - Annelie Strålfors
- Karolinska Institute, Department of Biosciences and Medical Nutrition, NOVUM, Huddinge, Sweden
| | - Anna Shevchenko
- Max Planck Institute of Molecular Cell Biology and Genetics, Dresden, Germany
| | - Rein Aasland
- Department of Molecular Biology, University of Bergen, Bergen, Norway
| | - Andrej Shevchenko
- Max Planck Institute of Molecular Cell Biology and Genetics, Dresden, Germany
| | - Karl Ekwall
- Karolinska Institute, Department of Biosciences and Medical Nutrition, NOVUM, Huddinge, Sweden
| | - A. Francis Stewart
- Genomics, BioInnovationsZentrum, Technische Universität Dresden, Dresden, Germany
- * E-mail:
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230
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Lu PY, Lévesque N, Kobor MS. NuA4 and SWR1-C: two chromatin-modifying complexes with overlapping functions and componentsThis paper is one of a selection of papers published in this Special Issue, entitled 30th Annual International Asilomar Chromatin and Chromosomes Conference, and has undergone the Journal's usual peer review process. Biochem Cell Biol 2009; 87:799-815. [DOI: 10.1139/o09-062] [Citation(s) in RCA: 87] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Chromatin structure is important for the compaction of eukaryotic genomes, thus chromatin modifications play a fundamental role in regulating many cellular processes. The coordinated activities of various chromatin-remodelling and -modifying complexes are crucial in maintaining distinct chromatin neighbourhoods, which in turn ensure appropriate gene expression, as well as DNA replication, repair, and recombination. SWR1-C is an ATP-dependent histone deposition complex for the histone variant H2A.Z, whereas NuA4 is a histone acetyltransferase for histones H4, H2A, and H2A.Z. Together the NuA4 and SWR1-C chromatin-modifying complexes alter the chromatin structure through 3 distinct modifications in yeast: post-translational addition of chemical groups, ATP-dependent chromatin remodelling, and histone variant incorporation. These 2 multi-protein complexes share 4 subunits and function together to regulate the circuitry of H2A.Z biology. The components and functions of both multi-protein complexes are evolutionarily conserved and play important roles in multi-cellular development and cellular differentiation in higher eukaryotes. This review will summarize recent findings about NuA4 and SWR1-C and will focus on the connection between these complexes by investigating their physical and functional interactions through eukaryotic evolution.
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Affiliation(s)
- Phoebe Y.T. Lu
- Centre for Molecular Medicine and Therapeutics, Child and Family Research Institute, Department of Medical Genetics, University of British Columbia, Vancouver, BC V5Z 4H4, Canada
| | - Nancy Lévesque
- Centre for Molecular Medicine and Therapeutics, Child and Family Research Institute, Department of Medical Genetics, University of British Columbia, Vancouver, BC V5Z 4H4, Canada
| | - Michael S. Kobor
- Centre for Molecular Medicine and Therapeutics, Child and Family Research Institute, Department of Medical Genetics, University of British Columbia, Vancouver, BC V5Z 4H4, Canada
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231
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Petty EL, Collette KS, Cohen AJ, Snyder MJ, Csankovszki G. Restricting dosage compensation complex binding to the X chromosomes by H2A.Z/HTZ-1. PLoS Genet 2009; 5:e1000699. [PMID: 19851459 PMCID: PMC2760203 DOI: 10.1371/journal.pgen.1000699] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2009] [Accepted: 09/23/2009] [Indexed: 01/15/2023] Open
Abstract
Dosage compensation ensures similar levels of X-linked gene products in males (XY or XO) and females (XX), despite their different numbers of X chromosomes. In mammals, flies, and worms, dosage compensation is mediated by a specialized machinery that localizes to one or both of the X chromosomes in one sex resulting in a change in gene expression from the affected X chromosome(s). In mammals and flies, dosage compensation is associated with specific histone posttranslational modifications and replacement with variant histones. Until now, no specific histone modifications or histone variants have been implicated in Caenorhabditis elegans dosage compensation. Taking a candidate approach, we have looked at specific histone modifications and variants on the C. elegans dosage compensated X chromosomes. Using RNAi-based assays, we show that reducing levels of the histone H2A variant, H2A.Z (HTZ-1 in C. elegans), leads to partial disruption of dosage compensation. By immunofluorescence, we have observed that HTZ-1 is under-represented on the dosage compensated X chromosomes, but not on the non-dosage compensated male X chromosome. We find that reduction of HTZ-1 levels by RNA interference (RNAi) and mutation results in only a very modest change in dosage compensation complex protein levels. However, in these animals, the X chromosome-specific localization of the complex is partially disrupted, with some nuclei displaying DCC localization beyond the X chromosome territory. We propose a model in which HTZ-1, directly or indirectly, serves to restrict the dosage compensation complex to the X chromosome by acting as or regulating the activity of an autosomal repellant.
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Affiliation(s)
- Emily L. Petty
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Karishma S. Collette
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Alysse J. Cohen
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Martha J. Snyder
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Györgyi Csankovszki
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, Michigan, United States of America
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232
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Koerber RT, Rhee HS, Jiang C, Pugh BF. Interaction of transcriptional regulators with specific nucleosomes across the Saccharomyces genome. Mol Cell 2009; 35:889-902. [PMID: 19782036 PMCID: PMC2760215 DOI: 10.1016/j.molcel.2009.09.011] [Citation(s) in RCA: 92] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2009] [Revised: 08/17/2009] [Accepted: 09/09/2009] [Indexed: 01/03/2023]
Abstract
A canonical nucleosome architecture around promoters establishes the context in which proteins regulate gene expression. Whether gene regulatory proteins that interact with nucleosomes are selective for individual nucleosome positions across the genome is not known. Here, we examine on a genomic scale several protein-nucleosome interactions, including those that (1) bind histones (Bdf1/SWR1 and Srm1), (2) bind specific DNA sequences (Rap1 and Reb1), and (3) potentially collide with nucleosomes during transcription (RNA polymerase II). We find that the Bdf1/SWR1 complex forms a dinucleosome complex that is selective for the +1 and +2 nucleosomes of active genes. Rap1 selectively binds to its cognate site on the rotationally exposed first and second helical turn of nucleosomal DNA. We find that a transcribing RNA polymerase creates a delocalized state of resident nucleosomes. These findings suggest that nucleosomes around promoter regions have position-specific functions and that some gene regulators have position-specific nucleosomal interactions.
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Affiliation(s)
- R. Thomas Koerber
- Center for Eukaryotic Gene Regulation, Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA 16802
| | - Ho Sung Rhee
- Center for Eukaryotic Gene Regulation, Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA 16802
| | - Cizhong Jiang
- Center for Eukaryotic Gene Regulation, Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA 16802
| | - B. Franklin Pugh
- Center for Eukaryotic Gene Regulation, Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA 16802
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233
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Choi J, Heo K, An W. Cooperative action of TIP48 and TIP49 in H2A.Z exchange catalyzed by acetylation of nucleosomal H2A. Nucleic Acids Res 2009; 37:5993-6007. [PMID: 19696079 PMCID: PMC2764430 DOI: 10.1093/nar/gkp660] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
H2A.Z is an evolutionarily conserved H2A variant that plays a key role in the regulation of chromatin transcription. To understand the molecular mechanism of H2A.Z exchange, we purified two distinct H2A.Z-interacting complexes termed the small and big complexes from a human cell line. The big complex contains most components of the SRCAP chromatin remodeling and TIP60 HAT complexes, whereas the small complex possesses only a subset of SRCAP and TIP60 subunits. Our exchange analysis revealed that both small and big complexes enhance the incorporation of H2A.Z-H2B dimer into the nucleosome. In addition, TIP60-mediated acetylation of nucleosomal H2A specifically facilitates the action of the small complex in the H2A.Z exchange reaction. Among factors present in the small complex, we determined that TIP48 and TIP49 play a major role in catalyzing H2A acetylation-induced H2A.Z exchange via their ATPase activities. Overall, our work uncovers the previously-unrecognized role of TIP48 and TIP49 in H2A.Z exchange and a novel epigenetic mechanism controlling this process.
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Affiliation(s)
- Jongkyu Choi
- Department of Biochemistry and Molecular Biology, University of Southern California, Norris Comprehensive Cancer Center, Los Angeles, CA 90033, USA
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234
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Abstract
The packaging of chromosomal DNA by nucleosomes condenses and organizes the genome, but occludes many regulatory DNA elements. However, this constraint also allows nucleosomes and other chromatin components to actively participate in the regulation of transcription, chromosome segregation, DNA replication, and DNA repair. To enable dynamic access to packaged DNA and to tailor nucleosome composition in chromosomal regions, cells have evolved a set of specialized chromatin remodeling complexes (remodelers). Remodelers use the energy of ATP hydrolysis to move, destabilize, eject, or restructure nucleosomes. Here, we address many aspects of remodeler biology: their targeting, mechanism, regulation, shared and unique properties, and specialization for particular biological processes. We also address roles for remodelers in development, cancer, and human syndromes.
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Affiliation(s)
- Cedric R Clapier
- Howard Hughes Medical Institute, Department of Oncological Sciences, Huntsman Cancer Institute, University of Utah School of Medicine, Salt Lake City, UT 84112, USA.
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235
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Abstract
Eukaryotic genomes are packaged into a nucleoprotein complex known as chromatin, which affects most processes that occur on DNA. Along with genetic and biochemical studies of resident chromatin proteins and their modifying enzymes, mapping of chromatin structure in vivo is one of the main pillars in our understanding of how chromatin relates to cellular processes. In this review, we discuss the use of genomic technologies to characterize chromatin structure in vivo, with a focus on data from budding yeast and humans. The picture emerging from these studies is the detailed chromatin structure of a typical gene, where the typical behavior gives insight into the mechanisms and deep rules that establish chromatin structure. Important deviation from the archetype is also observed, usually as a consequence of unique regulatory mechanisms at special genomic loci. Chromatin structure shows substantial conservation from yeast to humans, but mammalian chromatin has additional layers of complexity that likely relate to the requirements of multicellularity such as the need to establish faithful gene regulatory mechanisms for cell differentiation.
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Affiliation(s)
- Oliver J Rando
- Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, MA 01605, USA.
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236
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Jha S, Dutta A. RVB1/RVB2: running rings around molecular biology. Mol Cell 2009; 34:521-33. [PMID: 19524533 DOI: 10.1016/j.molcel.2009.05.016] [Citation(s) in RCA: 176] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2009] [Revised: 04/25/2009] [Accepted: 05/20/2009] [Indexed: 12/31/2022]
Abstract
RVB1/RVB2 (also known as Pontin/Reptin, TIP49/TIP48, RuvbL1/RuvbL2, ECP54/ECP51, INO80H/INO80J, TIH1/TIH2, and TIP49A/TIP49B) are two highly conserved members of the AAA+ family that are present in different protein and nucleoprotein complexes. Recent studies implicate the RVB-containing complexes in many cellular processes such as transcription, DNA damage response, snoRNP assembly, cellular transformation, and cancer metastasis. In this review, we discuss recent advances in our understanding of RVB-containing complexes and their role in these pathways.
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Affiliation(s)
- Sudhakar Jha
- Department of Biochemistry and Molecular Genetics, School of Medicine, University of Virginia, Jordan 1240, 1340 Jefferson Park Avenue, Charlottesville, VA 22908, USA
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237
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March-Díaz R, Reyes JC. The beauty of being a variant: H2A.Z and the SWR1 complex in plants. MOLECULAR PLANT 2009; 2:565-577. [PMID: 19825639 DOI: 10.1093/mp/ssp019] [Citation(s) in RCA: 97] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Numerous studies have shown that the nucleosome is a dynamic structure that strongly influences gene expression. Dynamism concerns different nucleosomal characteristics, including position, posttranslational modifications, and histone composition. Thus, within the nucleosome, canonical histones can be exchanged by histone variant proteins with specific functions-a process known as 'histone replacement'. The histone variant H2A.Z has an important function in transcription and, during the last few years, its role in plant development and immune response has become evident. Compiling genetic and biochemical studies from several laboratories has revealed that plants contain a multiprotein complex, similar to the SWR1/SRCAP complex from yeast and animals, involved in H2A.Z deposition. Despite intense research in different organisms, the mechanism by which H2A.Z influences transcription is still unknown. However, recent results from Arabidopsis have shown a strong inverse correlation between H2A.Z and DNA methylation, suggesting that H2A.Z might protect genes from silencing.
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Affiliation(s)
- Rosana March-Díaz
- Andalusian Center for Molecular Biology and Regenerative Medicine (CABIMER), CSIC, Américo Vespucio s/n, E-41092 Sevilla, Spain
| | - Jose C Reyes
- Andalusian Center for Molecular Biology and Regenerative Medicine (CABIMER), CSIC, Américo Vespucio s/n, E-41092 Sevilla, Spain.
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238
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Gévry N, Hardy S, Jacques PE, Laflamme L, Svotelis A, Robert F, Gaudreau L. Histone H2A.Z is essential for estrogen receptor signaling. Genes Dev 2009; 23:1522-33. [PMID: 19515975 DOI: 10.1101/gad.1787109] [Citation(s) in RCA: 121] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Incorporation of H2A.Z into the chromatin of inactive promoters has been shown to poise genes for their expression. Here we provide strong evidence that H2A.Z is incorporated into the promoter regions of estrogen receptor (ERalpha) target genes only upon gene induction, and that, in a cyclic pattern. Moreover, members of the human H2A.Z-depositing complex, p400, also follow the same gene recruitment kinetics as H2A.Z. Importantly, cellular depletion of H2A.Z or p400 leads to a severe defect in estrogen signaling, including loss of estrogen-specific cell proliferation. We find that incorporation of H2A.Z within TFF1 promoter chromatin allows nucleosomes to adopt preferential positions along the DNA translational axis. Finally, we provide evidence that H2A.Z is essential to allow estrogen-responsive enhancer function. Taken together, our results provide strong mechanistic insight into how H2A.Z regulates ERalpha-mediated gene expression and provide a novel link between H2A.Z-p400 and ERalpha-dependent gene regulation and enhancer function.
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Affiliation(s)
- Nicolas Gévry
- Département de biologie, Faculté des sciences, Université de Sherbrooke, Sherbrooke, Québec, Canada
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239
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Svotelis A, Gévry N, Gaudreau L. Regulation of gene expression and cellular proliferation by histone H2A.Z. Biochem Cell Biol 2009; 87:179-88. [PMID: 19234533 DOI: 10.1139/o08-138] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
The mammalian genome is organized into a structure of DNA and proteins known as chromatin. In general, chromatin presents a barrier to gene expression that is regulated by several pathways, namely by the incorporation of histone variants into the nucleosome. In yeast, H2A.Z is an H2A histone variant that is incorporated into nucleosomes as an H2A.Z/H2B dimer by the Swr1 complex and by the SRCAP and p400/Tip60 complexes in mammalian cells. H2A.Z has been associated with the poising of genes for transcriptional activation in the yeast model system, and is essential for development in higher eukaryotes. Recent studies in our laboratory have demonstrated a p400-dependent deposition of H2A.Z at the promoter of p21WAF1/CIP1, a consequence that prevents the activation of the gene by p53, thereby inhibiting p53-dependent replicative senescence, a form of cell-cycle arrest crucial in the prevention of carcinogenic transformation of cells. Moreover, H2A.Z is overexpressed in several different types of cancers, and its overexpression has been associated functionally with the proliferation state of cells. Therefore, we suggest that H2A.Z is an important regulator of gene expression, and its deregulation may lead to the increased proliferation of mammalian cells.
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Affiliation(s)
- Amy Svotelis
- Departement de biologie, Faculte des Sciences, Universite de Sherbrooke, Sherbrooke, QCJ1K2R1, Canada
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240
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Altaf M, Auger A, Covic M, Côté J. Connection between histone H2A variants and chromatin remodeling complexes. Biochem Cell Biol 2009; 87:35-50. [PMID: 19234522 DOI: 10.1139/o08-140] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The organization of the eukaryotic genome into chromatin makes it inaccessible to the factors required for gene transcription and DNA replication, recombination, and repair. In addition to histone-modifying enzymes and ATP-dependent chromatin remodeling complexes, which play key roles in regulating many nuclear processes by altering the chromatin structure, cells have developed a mechanism of modulating chromatin structure by incorporating histone variants. These variants are incorporated into specific regions of the genome throughout the cell cycle. H2A.Z, which is an evolutionarily conserved H2A variant, performs several seemingly unrelated and even contrary functions. Another H2A variant, H2A.X, plays a very important role in the cellular response to DNA damage. This review summarizes the recent developments in our understanding of the role of H2A.Z and H2A.X in the regulation of chromatin structure and function, focusing on their functional links with chromatin modifying and remodeling complexes.
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Affiliation(s)
- Mohammed Altaf
- Laval University Cancer Research Center, Hotel-Dieu de Quebec, Quebec City, QCG1R2J6, Canada
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241
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Chromatin remodelling beyond transcription: the INO80 and SWR1 complexes. Nat Rev Mol Cell Biol 2009; 10:373-84. [PMID: 19424290 DOI: 10.1038/nrm2693] [Citation(s) in RCA: 222] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Chromatin-modifying factors have essential roles in DNA processing pathways that dictate cellular functions. The ability of chromatin modifiers, including the INO80 and SWR1 chromatin-remodelling complexes, to regulate transcriptional processes is well established. However, recent studies reveal that the INO80 and SWR1 complexes have crucial functions in many other essential processes, including DNA repair, checkpoint regulation, DNA replication, telomere maintenance and chromosome segregation. During these diverse nuclear processes, the INO80 and SWR1 complexes function cooperatively with their histone substrates, gamma-H2AX and H2AZ. This research reveals that INO80 and SWR1 ATP-dependent chromatin remodelling is an integral component of pathways that maintain genomic integrity.
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242
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Casagrande V, Del Vescovo V, Militti C, Mangiapelo E, Frontali L, Negri R, Bianchi MM. Cesium chloride sensing and signaling inSaccharomyces cerevisiae: an interplay among the HOG and CWI MAPK pathways and the transcription factor Yaf9. FEMS Yeast Res 2009; 9:400-10. [DOI: 10.1111/j.1567-1364.2009.00486.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
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243
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van Attikum H, Gasser SM. Crosstalk between histone modifications during the DNA damage response. Trends Cell Biol 2009; 19:207-17. [PMID: 19342239 DOI: 10.1016/j.tcb.2009.03.001] [Citation(s) in RCA: 400] [Impact Index Per Article: 26.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2009] [Revised: 03/03/2009] [Accepted: 03/03/2009] [Indexed: 12/18/2022]
Abstract
Chromatin structure has a crucial role in processes of metabolism, including transcription, DNA replication and DNA damage repair. An evolutionarily conserved variant of histone H2A, called H2AX, is one of the key components of chromatin. H2AX becomes rapidly phosphorylated on chromatin surrounding DNA double-strand breaks (DSBs). Recent studies have shown that H2AX and other components of damaged chromatin also become modified by acetylation and ubiquitylation. This review discusses how specific combinations of histone modifications affect the accumulation and function of DNA repair factors (MDC1, RNF8, RNF168, 53BP1, BRCA1) and chromatin remodeling complexes (INO80, SWR1, TIP60-p400) at DSBs. These collectively regulate DSB repair and checkpoint arrest, avoiding genomic instability and oncogenic transformation in higher eukaryotes.
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Affiliation(s)
- Haico van Attikum
- Department of Toxicogenetics, Leiden University Medical Center, Einthovenweg 20, 2333 ZC, Leiden, the Netherlands.
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244
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Kalocsay M, Hiller NJ, Jentsch S. Chromosome-wide Rad51 spreading and SUMO-H2A.Z-dependent chromosome fixation in response to a persistent DNA double-strand break. Mol Cell 2009; 33:335-43. [PMID: 19217407 DOI: 10.1016/j.molcel.2009.01.016] [Citation(s) in RCA: 263] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2008] [Revised: 01/07/2009] [Accepted: 01/27/2009] [Indexed: 10/21/2022]
Abstract
DNA double-strand breaks (DSBs) are acutely hazardous for cells, as they can cause genome instability. DSB repair involves the sequential recruitment of repair factors to the DSBs, followed by Rad51-mediated homology probing, DNA synthesis, and ligation. However, little is known about how cells react if no homology is found and DSBs persist. Here, by monitoring a single persistent DNA break, we show that, following DNA resection and RPA recruitment, Rad51 spreads chromosome-wide bidirectionally from the DSB but selectively only on the broken chromosome. Remarkably, the persistent DSB is later fixed to the nuclear periphery in a process that requires Rad51, the histone variant H2A.Z, its SUMO modification, and the DNA-damage checkpoint. Indeed, H2A.Z is deposited close to the break early but transiently and directs DNA resection, single DSB-induced checkpoint activation, and DSB anchoring. Thus, a persistent DSB induces a multifaceted response, which is linked to a specific chromatin mark.
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Affiliation(s)
- Marian Kalocsay
- Department of Molecular Cell Biology, Max Planck Institute of Biochemistry, Am Klopferspitz 18, 82152 Martinsried, Germany
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245
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Hansen DF, Zhou Z, Feng H, Miller Jenkins LM, Bai Y, Kay LE. Binding kinetics of histone chaperone Chz1 and variant histone H2A.Z-H2B by relaxation dispersion NMR spectroscopy. J Mol Biol 2009; 387:1-9. [PMID: 19385041 PMCID: PMC2768378 DOI: 10.1016/j.jmb.2009.01.009] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
The genome of eukaryotic cells is packed into a compact structure called chromatin that consists of DNA as well as histone and non-histone proteins. Histone chaperones associate with histone proteins and play important roles in the assembly of chromatin structure and transport of histones in the cell. The recently discovered histone chaperone Chz1 associates with the variant histone H2A.Z of budding yeast and plays a critical role in the exchange of the canonical histone pair H2A-H2B for the variant H2A.ZH2B. Here, we present an NMR approach that provides accurate estimates for the rates of association and dissociation of Chz1 and H2A.Z-H2B. The methodology exploits the fact that in a 1:1 mixture of Chz1 and H2A.Z-H2B, the small amounts of unbound proteins that are invisible in spectra produce line broadening of signals from the complex that can be quantified in terms of the thermodynamics and kinetics of the exchange process. The dissociation rate constant measured, 22 +/- 2 s(-1), provides an upper bound for the rate of transfer of H2A.Z-H2B to the chromatin remodeling complex, and the faster-than-diffusion association rate, 10(8) +/- 10(7) M(-1) s(-1), establishes the importance of attractive electrostatic interactions that form the chaperone-histone complex.
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Affiliation(s)
- D Flemming Hansen
- Department of Molecular Genetics, University of Toronto, Toronto, Ontario, Canada
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246
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Gervais AL, Gaudreau L. Discriminating nucleosomes containing histone H2A.Z or H2A based on genetic and epigenetic information. BMC Mol Biol 2009; 10:18. [PMID: 19261190 PMCID: PMC2660331 DOI: 10.1186/1471-2199-10-18] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2008] [Accepted: 03/04/2009] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND Nucleosomes are nucleoproteic complexes, formed of eight histone molecules and DNA, and they are responsible for the compaction of the eukaryotic genome. Their presence on DNA influences many cellular processes, such as transcription, DNA replication, and DNA repair. The evolutionarily conserved histone variant H2A.Z alters nucleosome stability and is highly enriched at gene promoters. Its localization to specific genomic loci in human cells is presumed to depend either on the underlying DNA sequence or on a certain epigenetic modification pattern. RESULTS We analyzed the differences in histone post-translational modifications and DNA sequences near nucleosomes that do or do not contain H2A.Z. We show that both the epigenetic context and underlying sequences can be used to classify nucleosomal regions, with highly significant accuracy, as likely to either contain H2A.Z or canonical histone H2A. Furthermore, our models accurately recapitulate the observed nucleosome occupancy near the transcriptional start sites of human promoters. CONCLUSION We conclude that both genetic and epigenetic features are likely to participate in targeting H2A.Z to distinct chromatin loci.
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Affiliation(s)
- Alain L Gervais
- Département de Biologie, Université de Sherbrooke, Sherbrooke, Québec, Canada.
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247
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Venters BJ, Pugh BF. A canonical promoter organization of the transcription machinery and its regulators in the Saccharomyces genome. Genes Dev 2009; 19:360-71. [PMID: 19124666 PMCID: PMC2661807 DOI: 10.1101/gr.084970.108] [Citation(s) in RCA: 144] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2008] [Accepted: 12/18/2008] [Indexed: 12/11/2022]
Abstract
The predominant organizational theme by which the transcription machinery and chromatin regulators are positioned within promoter regions or throughout genes in a genome is largely unknown. We mapped the genomic location of diverse representative components of the gene regulatory machinery in Saccharomyces cerevisiae to an experimental resolution of <40 bp. Sequence-specific gene regulators, chromatin regulators, mediator, and RNA polymerase (Pol) II were found primarily near the downstream border from the "-1" nucleosome, which abuts against the approximately 140-bp nucleosome-free promoter region (NFR). General transcription factors TFIIA, -B, -D, -E, -F, -H were located near the downstream edge from the NFR. The -1 nucleosome dissociated upon Pol II recruitment, but not upon recruitment of only TBP and TFIIB. The position of many sequence-specific regulators in promoter regions correlated with the position of specific remodeling complexes, potentially reflecting functional interactions. Taken together the findings suggest that the combined action of activators and chromatin remodeling complexes remove the -1 nucleosome after the preinitiation complex (PIC) has partially assembled, but before or concomitant with Pol II recruitment. We find PIC assembly, which includes Pol II recruitment, to be a significant rate-limiting step during transcription, but that additional gene-specific rate-limiting steps associated with Pol II occur after recruitment.
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Affiliation(s)
- Bryan J. Venters
- Center for Gene Regulation, Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
| | - B. Franklin Pugh
- Center for Gene Regulation, Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
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Abstract
Knowing the precise locations of nucleosomes in a genome is key to understanding how genes are regulated. Recent 'next generation' ChIP-chip and ChIP-Seq technologies have accelerated our understanding of the basic principles of chromatin organization. Here we discuss what high-resolution genome-wide maps of nucleosome positions have taught us about how nucleosome positioning demarcates promoter regions and transcriptional start sites, and how the composition and structure of promoter nucleosomes facilitate or inhibit transcription. A detailed picture is starting to emerge of how diverse factors, including underlying DNA sequences and chromatin remodelling complexes, influence nucleosome positioning.
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Affiliation(s)
- Cizhong Jiang
- Center for Eukaryotic Gene Regulation, Department of Biochemistry and Molecular Biology, Pennsylvania State University, University Park, Pennsylvania 16802, USA
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Anders A, Watt S, Bähler J, Sawin KE. Improved tools for efficient mapping of fission yeast genes: identification of microtubule nucleation modifier mod22-1 as an allele of chromatin- remodelling factor gene swr1. Yeast 2009; 25:913-25. [PMID: 19160458 PMCID: PMC2964509 DOI: 10.1002/yea.1639] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
Fission yeast genes identified in genetic screens are usually cloned by transformation of mutants with plasmid libraries. However, for some genes this can be difficult, and positional cloning approaches are required. The mutation swi5-39 reduces recombination frequency in homozygous crosses and has been used as a tool in mapping gene position (Schmidt, 1993). However, strain construction in swi5-39-based mapping is significantly more laborious than is desirable. Here we describe a set of strains designed to make swi5-based mapping more efficient and more powerful. The first improvement is the use of a swi5Δ strain marked with kanamycin (G418) resistance, which greatly facilitates identification of swi5 mutants. The second improvement, which follows directly from the first, is the introduction of a large number of auxotrophic markers into mapping strains, increasing the likelihood of finding close linkage between a marker and the mutation of interest. We combine these new mapping strains with a rec12Δ-based approach for initial mapping of a mutation to an individual chromosome. Together, the two methods allow an approximate determination of map position in only a small number of crosses. We used these to determine that mod22-1, a modifier of microtubule nucleation phenotypes, encodes a truncation allele of Swr1, a chromatin-remodelling factor involved in nucleosomal deposition of H2A.Z histone variant Pht1. Expression microarray analysis of mod22-1, swr1Δ and pht1Δ cells suggests that the modifier phenotype of mod22-1 mutants may be due to small changes in expression of one or more genes involved in tubulin function. Copyright © 2009 John Wiley & Sons, Ltd.
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Affiliation(s)
- Andreas Anders
- Wellcome Trust Centre for Cell Biology, University of Edinburgh, Edinburgh, UK
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250
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Role of chromatin states in transcriptional memory. Biochim Biophys Acta Gen Subj 2009; 1790:445-55. [PMID: 19236904 DOI: 10.1016/j.bbagen.2009.02.009] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2009] [Revised: 02/10/2009] [Accepted: 02/11/2009] [Indexed: 12/16/2022]
Abstract
Establishment of cellular memory and its faithful propagation is critical for successful development of multicellular organisms. As pluripotent cells differentiate, choices in cell fate are inherited and maintained by their progeny throughout the lifetime of the organism. A major factor in this process is the epigenetic inheritance of specific transcriptional states or transcriptional memory. In this review, we discuss chromatin transitions and mechanisms by which they are inherited by subsequent generations. We also discuss illuminating cases of cellular memory in budding yeast and evaluate whether transcriptional memory in yeast is nuclear or cytoplasmically inherited.
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