1
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Cardona AH, Ecsedi S, Khier M, Yi Z, Bahri A, Ouertani A, Valero F, Labrosse M, Rouquet S, Robert S, Loubat A, Adekunle D, Hubstenberger A. Self-demixing of mRNA copies buffers mRNA:mRNA and mRNA:regulator stoichiometries. Cell 2023; 186:4310-4324.e23. [PMID: 37703874 DOI: 10.1016/j.cell.2023.08.018] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Revised: 06/08/2023] [Accepted: 08/16/2023] [Indexed: 09/15/2023]
Abstract
Cellular homeostasis requires the robust control of biomolecule concentrations, but how do millions of mRNAs coordinate their stoichiometries in the face of dynamic translational changes? Here, we identified a two-tiered mechanism controlling mRNA:mRNA and mRNA:protein stoichiometries where mRNAs super-assemble into condensates with buffering capacity and sorting selectivity through phase-transition mechanisms. Using C. elegans oogenesis arrest as a model, we investigated the transcriptome cytosolic reorganization through the sequencing of RNA super-assemblies coupled with single mRNA imaging. Tightly repressed mRNAs self-assembled into same-sequence nanoclusters that further co-assembled into multiphase condensates. mRNA self-sorting was concentration dependent, providing a self-buffering mechanism that is selective to sequence identity and controls mRNA:mRNA stoichiometries. The cooperative sharing of limiting translation repressors between clustered mRNAs prevented the disruption of mRNA:repressor stoichiometries in the cytosol. Robust control of mRNA:mRNA and mRNA:protein stoichiometries emerges from mRNA self-demixing and cooperative super-assembly into multiphase multiscale condensates with dynamic storage capacity.
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Affiliation(s)
| | - Szilvia Ecsedi
- Université Côte D'Azur, CNRS, Inserm, iBV, 06108 Nice, France
| | - Mokrane Khier
- Université Côte D'Azur, CNRS, Inserm, iBV, 06108 Nice, France
| | - Zhou Yi
- Université Côte D'Azur, CNRS, Inserm, iBV, 06108 Nice, France
| | - Alia Bahri
- Université Côte D'Azur, CNRS, Inserm, iBV, 06108 Nice, France
| | - Amira Ouertani
- Université Côte D'Azur, CNRS, Inserm, iBV, 06108 Nice, France
| | - Florian Valero
- Université Côte D'Azur, CNRS, Inserm, iBV, 06108 Nice, France
| | | | - Sami Rouquet
- Université Côte D'Azur, CNRS, Inserm, iBV, 06108 Nice, France
| | - Stéphane Robert
- Université Aix Marseille, Inserm, INRAE, C2VN, 13005 Marseille, France
| | - Agnès Loubat
- Université Côte D'Azur, CNRS, Inserm, iBV, 06108 Nice, France
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2
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Vidal-Cruchez O, Nicolini VJ, Rete T, Jacquet K, Rezzonico R, Lacoux C, Domdom MA, Roméo B, Roux J, Hubstenberger A, Mari B, Mograbi B, Hofman P, Brest P. KRAS and NRAS Translation Is Increased upon MEK Inhibitors-Induced Processing Bodies Dissolution. Cancers (Basel) 2023; 15:3078. [PMID: 37370689 DOI: 10.3390/cancers15123078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Revised: 05/29/2023] [Accepted: 05/30/2023] [Indexed: 06/29/2023] Open
Abstract
Overactivation of the mitogen-activated protein kinase (MAPK) pathway is a critical driver of many human cancers. However, therapies directly targeting this pathway lead to cancer drug resistance. Resistance has been linked to compensatory RAS overexpression, but the mechanisms underlying this response remain unclear. Here, we find that MEK inhibitors (MEKi) are associated with an increased translation of the KRAS and NRAS oncogenes through a mechanism involving dissolution of processing body (P-body) biocondensates. This effect is seen across different cell types and is extremely dynamic since removal of MEKi and ERK reactivation result in reappearance of P-bodies and reduced RAS-dependent signaling. Moreover, we find that P-body scaffold protein levels negatively impact RAS expression. Overall, we describe a new feedback loop mechanism involving biocondensates such as P-bodies in the translational regulation of RAS proteins and MAPK signaling.
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Affiliation(s)
- Olivia Vidal-Cruchez
- Université Côte d'Azur, Institute of Research on Cancer and Aging of Nice (IRCAN), CNRS, INSERM, Centre Antoine Lacassagne, 28, Avenue de Valombrose, 06107 Nice, France
- FHU-OncoAge, IHU-RESPIRera, 06001 Nice, France
| | - Victoria J Nicolini
- Université Côte d'Azur, Institute of Research on Cancer and Aging of Nice (IRCAN), CNRS, INSERM, Centre Antoine Lacassagne, 28, Avenue de Valombrose, 06107 Nice, France
- FHU-OncoAge, IHU-RESPIRera, 06001 Nice, France
| | - Tifenn Rete
- Université Côte d'Azur, Institute of Research on Cancer and Aging of Nice (IRCAN), CNRS, INSERM, Centre Antoine Lacassagne, 28, Avenue de Valombrose, 06107 Nice, France
- FHU-OncoAge, IHU-RESPIRera, 06001 Nice, France
| | - Karine Jacquet
- Université Côte d'Azur, Institute of Research on Cancer and Aging of Nice (IRCAN), CNRS, INSERM, Centre Antoine Lacassagne, 28, Avenue de Valombrose, 06107 Nice, France
- FHU-OncoAge, IHU-RESPIRera, 06001 Nice, France
| | - Roger Rezzonico
- FHU-OncoAge, IHU-RESPIRera, 06001 Nice, France
- Université Côte d'Azur, CNRS, INSERM, CNRS UMR7275, IPMC, 06560 Valbonne, France
| | - Caroline Lacoux
- Université Côte d'Azur, CNRS UMR7275, IPMC, 06560 Valbonne, France
| | - Marie-Angela Domdom
- Université Côte d'Azur, Institute of Research on Cancer and Aging of Nice (IRCAN), CNRS, INSERM, Centre Antoine Lacassagne, 28, Avenue de Valombrose, 06107 Nice, France
- FHU-OncoAge, IHU-RESPIRera, 06001 Nice, France
| | - Barnabé Roméo
- Université Côte d'Azur, Institute of Research on Cancer and Aging of Nice (IRCAN), CNRS, INSERM, Centre Antoine Lacassagne, 28, Avenue de Valombrose, 06107 Nice, France
- FHU-OncoAge, IHU-RESPIRera, 06001 Nice, France
| | - Jérémie Roux
- Université Côte d'Azur, Institute of Research on Cancer and Aging of Nice (IRCAN), CNRS, INSERM, Centre Antoine Lacassagne, 28, Avenue de Valombrose, 06107 Nice, France
- FHU-OncoAge, IHU-RESPIRera, 06001 Nice, France
- Université Côte d'Azur, CNRS UMR7275, IPMC, 06560 Valbonne, France
| | - Arnaud Hubstenberger
- Université Côte d'Azur, Institut Biologie Valrose (IBV), CNRS, Inserm, 06108 Nice, France
| | - Bernard Mari
- FHU-OncoAge, IHU-RESPIRera, 06001 Nice, France
- Université Côte d'Azur, CNRS UMR7275, IPMC, 06560 Valbonne, France
| | - Baharia Mograbi
- Université Côte d'Azur, Institute of Research on Cancer and Aging of Nice (IRCAN), CNRS, INSERM, Centre Antoine Lacassagne, 28, Avenue de Valombrose, 06107 Nice, France
- FHU-OncoAge, IHU-RESPIRera, 06001 Nice, France
| | - Paul Hofman
- Université Côte d'Azur, Institute of Research on Cancer and Aging of Nice (IRCAN), CNRS, INSERM, Centre Antoine Lacassagne, 28, Avenue de Valombrose, 06107 Nice, France
- FHU-OncoAge, IHU-RESPIRera, 06001 Nice, France
- Université Côte d'Azur, CHU-Nice, Pasteur Hospital, Laboratory of Clinical and Experimental Pathology, Hospital-Integrated Biobank (BB-0033-00025), 06001 Nice, France
| | - Patrick Brest
- Université Côte d'Azur, Institute of Research on Cancer and Aging of Nice (IRCAN), CNRS, INSERM, Centre Antoine Lacassagne, 28, Avenue de Valombrose, 06107 Nice, France
- FHU-OncoAge, IHU-RESPIRera, 06001 Nice, France
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3
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Courel M, Clément Y, Bossevain C, Foretek D, Vidal Cruchez O, Yi Z, Bénard M, Benassy MN, Kress M, Vindry C, Ernoult-Lange M, Antoniewski C, Morillon A, Brest P, Hubstenberger A, Roest Crollius H, Standart N, Weil D. GC content shapes mRNA storage and decay in human cells. eLife 2019; 8:49708. [PMID: 31855182 PMCID: PMC6944446 DOI: 10.7554/elife.49708] [Citation(s) in RCA: 97] [Impact Index Per Article: 19.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2019] [Accepted: 12/18/2019] [Indexed: 02/07/2023] Open
Abstract
mRNA translation and decay appear often intimately linked although the rules of this interplay are poorly understood. In this study, we combined our recent P-body transcriptome with transcriptomes obtained following silencing of broadly acting mRNA decay and repression factors, and with available CLIP and related data. This revealed the central role of GC content in mRNA fate, in terms of P-body localization, mRNA translation and mRNA stability: P-bodies contain mostly AU-rich mRNAs, which have a particular codon usage associated with a low protein yield; AU-rich and GC-rich transcripts tend to follow distinct decay pathways; and the targets of sequence-specific RBPs and miRNAs are also biased in terms of GC content. Altogether, these results suggest an integrated view of post-transcriptional control in human cells where most translation regulation is dedicated to inefficiently translated AU-rich mRNAs, whereas control at the level of 5’ decay applies to optimally translated GC-rich mRNAs.
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Affiliation(s)
- Maïté Courel
- Sorbonne Université, CNRS, Institut de Biologie Paris Seine (IBPS), Laboratoire de Biologie du Développement, Paris, France
| | - Yves Clément
- Ecole Normale Supérieure, Institut de Biologie de l'ENS, IBENS, Paris, France
| | - Clémentine Bossevain
- Sorbonne Université, CNRS, Institut de Biologie Paris Seine (IBPS), Laboratoire de Biologie du Développement, Paris, France
| | - Dominika Foretek
- ncRNA, Epigenetic and Genome Fluidity, Institut Curie, PSL Research University, CNRS UMR 3244, Sorbonne Université, Paris, France
| | | | - Zhou Yi
- Université Côte d'Azur, CNRS, INSERM, iBV, Nice, France
| | - Marianne Bénard
- Sorbonne Université, CNRS, Institut de Biologie Paris Seine (IBPS), Laboratoire de Biologie du Développement, Paris, France
| | - Marie-Noëlle Benassy
- Sorbonne Université, CNRS, Institut de Biologie Paris Seine (IBPS), Laboratoire de Biologie du Développement, Paris, France
| | - Michel Kress
- Sorbonne Université, CNRS, Institut de Biologie Paris Seine (IBPS), Laboratoire de Biologie du Développement, Paris, France
| | - Caroline Vindry
- Department of Biochemistry, University of Cambridge, Cambridge, United Kingdom
| | - Michèle Ernoult-Lange
- Sorbonne Université, CNRS, Institut de Biologie Paris Seine (IBPS), Laboratoire de Biologie du Développement, Paris, France
| | - Christophe Antoniewski
- Sorbonne Université, CNRS, Institut de Biologie Paris Seine (IBPS), ARTbio Bioinformatics Analysis Facility, Paris, France
| | - Antonin Morillon
- ncRNA, Epigenetic and Genome Fluidity, Institut Curie, PSL Research University, CNRS UMR 3244, Sorbonne Université, Paris, France
| | - Patrick Brest
- Université Côte d'Azur, CNRS, INSERM, IRCAN, FHU-OncoAge, Nice, France
| | | | | | - Nancy Standart
- Department of Biochemistry, University of Cambridge, Cambridge, United Kingdom
| | - Dominique Weil
- Sorbonne Université, CNRS, Institut de Biologie Paris Seine (IBPS), Laboratoire de Biologie du Développement, Paris, France
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4
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De Graeve F, Debreuve E, Rahmoun S, Ecsedi S, Bahri A, Hubstenberger A, Descombes X, Besse F. Detecting and quantifying stress granules in tissues of multicellular organisms with the Obj.MPP analysis tool. Traffic 2019; 20:697-711. [PMID: 31314165 DOI: 10.1111/tra.12678] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Revised: 07/15/2019] [Accepted: 07/15/2019] [Indexed: 12/11/2022]
Abstract
Stress granules (SGs) are macromolecular assemblies induced by stress and composed of proteins and mRNAs stalled in translation initiation. SGs play an important role in the response to stress and in the modulation of signaling pathways. Furthermore, these structures are related to the pathological ribonucleoprotein (RNP) aggregates found in neurodegenerative disease contexts, highlighting the need to understand how they are formed and recycled in normal and pathological contexts. Although genetically tractable multicellular organisms have been key in identifying modifiers of RNP aggregate toxicity, in vivo analysis of SG properties and regulation has lagged behind, largely due to the difficulty of detecting SG from images of intact tissues. Here, we describe the object detector software Obj.MPP and show how it overcomes the limits of classical object analyzers to extract the properties of SGs from wide-field and confocal images of Caenorhabditis elegans and Drosophila tissues, respectively. We demonstrate that Obj.MPP enables the identification of genes modulating the assembly of endogenous and pathological SGs, and thus that it will be useful in the context of future genetic screens and in vivo studies.
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Affiliation(s)
- Fabienne De Graeve
- Université Côte d'Azur, CNRS, Inserm, Institut de Biologie Valrose, Nice, France
| | - Eric Debreuve
- Université Côte d'Azur, CNRS, INRIA, I3S, Sophia-Antipolis, France
| | - Somia Rahmoun
- Université Coôte d'Azur, INRIA, CNRS, I3S, Sophia-Antipolis, France
| | - Szilvia Ecsedi
- Université Côte d'Azur, CNRS, Inserm, Institut de Biologie Valrose, Nice, France
| | - Alia Bahri
- Université Côte d'Azur, CNRS, Inserm, Institut de Biologie Valrose, Nice, France
| | - Arnaud Hubstenberger
- Université Côte d'Azur, CNRS, Inserm, Institut de Biologie Valrose, Nice, France
| | - Xavier Descombes
- Université Coôte d'Azur, INRIA, CNRS, I3S, Sophia-Antipolis, France
| | - Florence Besse
- Université Côte d'Azur, CNRS, Inserm, Institut de Biologie Valrose, Nice, France
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5
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Courel M, Bénard M, Ernoult-Lange M, Chouaib R, Hubstenberger A, Kress M, Weil D. [P-bodies: microscopic droplets to store mRNAs encoding regulatory proteins]. Med Sci (Paris) 2018; 34:306-308. [PMID: 29658471 DOI: 10.1051/medsci/20183404009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Maïté Courel
- Sorbonne université, CNRS, institut de biologie Paris-Seine (IBPS), Laboratoire de biologie du développement, 7, quai Saint Bernard, F-75005 Paris, France
| | - Marianne Bénard
- Sorbonne université, CNRS, institut de biologie Paris-Seine (IBPS), Laboratoire de biologie du développement, 7, quai Saint Bernard, F-75005 Paris, France
| | - Michèle Ernoult-Lange
- Sorbonne université, CNRS, institut de biologie Paris-Seine (IBPS), Laboratoire de biologie du développement, 7, quai Saint Bernard, F-75005 Paris, France
| | - Racha Chouaib
- Sorbonne université, CNRS, institut de biologie Paris-Seine (IBPS), Laboratoire de biologie du développement, 7, quai Saint Bernard, F-75005 Paris, France - Département de biologie, faculté de sciences, université du Liban, Beyrouth, Liban
| | - Arnaud Hubstenberger
- Sorbonne université, CNRS, institut de biologie Paris-Seine (IBPS), Laboratoire de biologie du développement, 7, quai Saint Bernard, F-75005 Paris, France - Université Côte d'Azur, CNRS, Inserm, institut de biologie Valrose, Nice, France
| | - Michel Kress
- Sorbonne université, CNRS, institut de biologie Paris-Seine (IBPS), Laboratoire de biologie du développement, 7, quai Saint Bernard, F-75005 Paris, France
| | - Dominique Weil
- Sorbonne université, CNRS, institut de biologie Paris-Seine (IBPS), Laboratoire de biologie du développement, 7, quai Saint Bernard, F-75005 Paris, France
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6
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Hubstenberger A, Courel M, Bénard M, Souquere S, Ernoult-Lange M, Chouaib R, Yi Z, Morlot JB, Munier A, Fradet M, Daunesse M, Bertrand E, Pierron G, Mozziconacci J, Kress M, Weil D. P-Body Purification Reveals the Condensation of Repressed mRNA Regulons. Mol Cell 2017; 68:144-157.e5. [PMID: 28965817 DOI: 10.1016/j.molcel.2017.09.003] [Citation(s) in RCA: 432] [Impact Index Per Article: 61.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2017] [Revised: 06/05/2017] [Accepted: 08/31/2017] [Indexed: 01/27/2023]
Abstract
Within cells, soluble RNPs can switch states to coassemble and condense into liquid or solid bodies. Although these phase transitions have been reconstituted in vitro, for endogenous bodies the diversity of the components, the specificity of the interaction networks, and the function of the coassemblies remain to be characterized. Here, by developing a fluorescence-activated particle sorting (FAPS) method to purify cytosolic processing bodies (P-bodies) from human epithelial cells, we identified hundreds of proteins and thousands of mRNAs that structure a dense network of interactions, separating P-body from non-P-body RNPs. mRNAs segregating into P-bodies are translationally repressed, but not decayed, and this repression explains part of the poor genome-wide correlation between RNA and protein abundance. P-bodies condense thousands of mRNAs that strikingly encode regulatory processes. Thus, we uncovered how P-bodies, by condensing and segregating repressed mRNAs, provide a physical substrate for the coordinated regulation of posttranscriptional mRNA regulons.
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Affiliation(s)
- Arnaud Hubstenberger
- UPMC Univ Paris 06, Institut de Biologie Paris-Seine (IBPS), CNRS UMR 7622, F-75005 Paris, France; Université Côte d'Azur, CNRS, Inserm, iBV, Nice, France.
| | - Maïté Courel
- UPMC Univ Paris 06, Institut de Biologie Paris-Seine (IBPS), CNRS UMR 7622, F-75005 Paris, France
| | - Marianne Bénard
- UPMC Univ Paris 06, Institut de Biologie Paris-Seine (IBPS), CNRS UMR 7622, F-75005 Paris, France
| | - Sylvie Souquere
- CNRS UMR-9196, Institut Gustave Roussy, F-94800 Villejuif, France
| | - Michèle Ernoult-Lange
- UPMC Univ Paris 06, Institut de Biologie Paris-Seine (IBPS), CNRS UMR 7622, F-75005 Paris, France
| | - Racha Chouaib
- UPMC Univ Paris 06, Institut de Biologie Paris-Seine (IBPS), CNRS UMR 7622, F-75005 Paris, France; IGMM, CNRS, University Montpellier, F-34090 Montpellier, France
| | - Zhou Yi
- UPMC Univ Paris 06, Institut de Biologie Paris-Seine (IBPS), CNRS UMR 7622, F-75005 Paris, France
| | | | - Annie Munier
- UPMC Univ Paris 06, LUMIC, UMS30, F-75005 Paris, France
| | | | - Maëlle Daunesse
- École Normale Supérieure, PSL Research University, CNRS, Inserm, Institut de Biologie de l'École Normale Supérieure (IBENS), Genomic Paris Centre, IBENS, F-75005 Paris, France
| | | | - Gérard Pierron
- CNRS UMR-9196, Institut Gustave Roussy, F-94800 Villejuif, France
| | | | - Michel Kress
- UPMC Univ Paris 06, Institut de Biologie Paris-Seine (IBPS), CNRS UMR 7622, F-75005 Paris, France
| | - Dominique Weil
- UPMC Univ Paris 06, Institut de Biologie Paris-Seine (IBPS), CNRS UMR 7622, F-75005 Paris, France.
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7
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Hubstenberger A, Cameron C, Noble SL, Keenan S, Evans TC. Modifiers of solid RNP granules control normal RNP dynamics and mRNA activity in early development. J Cell Biol 2015; 211:703-16. [PMID: 26527741 PMCID: PMC4639854 DOI: 10.1083/jcb.201504044] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2015] [Accepted: 09/25/2015] [Indexed: 12/13/2022] Open
Abstract
Modifiers of aberrant solid RNP granules suggest new insights into pathways that control dynamics of large-scale RNP bodies and mRNAs during C. elegans oogenesis. Ribonucleoproteins (RNPs) often coassemble into supramolecular bodies with regulated dynamics. The factors controlling RNP bodies and connections to RNA regulation are unclear. During Caenorhabditis elegans oogenesis, cytoplasmic RNPs can transition among diffuse, liquid, and solid states linked to mRNA regulation. Loss of CGH-1/Ddx6 RNA helicase generates solid granules that are sensitive to mRNA regulators. Here, we identified 66 modifiers of RNP solids induced by cgh-1 mutation. A majority of genes promote or suppress normal RNP body assembly, dynamics, or metabolism. Surprisingly, polyadenylation factors promote RNP coassembly in vivo, suggesting new functions of poly(A) tail regulation in RNP dynamics. Many genes carry polyglutatmine (polyQ) motifs or modulate polyQ aggregation, indicating possible connections with neurodegenerative disorders induced by CAG/polyQ expansion. Several RNP body regulators repress translation of mRNA subsets, suggesting that mRNAs are repressed by multiple mechanisms. Collectively, these findings suggest new pathways of RNP modification that control large-scale coassembly and mRNA activity during development.
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Affiliation(s)
- Arnaud Hubstenberger
- Department of Cell and Developmental Biology, University of Colorado Anschutz Medical Campus, Aurora, CO 80045 Pierre-and-Marie-Curie University, University Paris 06, 75005 Paris, France
| | - Cristiana Cameron
- Department of Cell and Developmental Biology, University of Colorado Anschutz Medical Campus, Aurora, CO 80045
| | - Scott L Noble
- Department of Cell and Developmental Biology, University of Colorado Anschutz Medical Campus, Aurora, CO 80045 Graduate Program in Molecular Biology, School of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO 80045
| | - Sean Keenan
- Department of Cell and Developmental Biology, University of Colorado Anschutz Medical Campus, Aurora, CO 80045
| | - Thomas C Evans
- Department of Cell and Developmental Biology, University of Colorado Anschutz Medical Campus, Aurora, CO 80045
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8
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Li S, Lamarche F, Charton R, Delphin C, Gires O, Hubstenberger A, Schlattner U, Rousseau D. Expression analysis of ATAD3 isoforms in rodent and human cell lines and tissues. Gene 2014; 535:60-9. [DOI: 10.1016/j.gene.2013.10.062] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2013] [Revised: 10/28/2013] [Accepted: 10/31/2013] [Indexed: 11/26/2022]
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9
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Hubstenberger A, Noble SL, Cameron C, Evans TC. Translation repressors, an RNA helicase, and developmental cues control RNP phase transitions during early development. Dev Cell 2014; 27:161-173. [PMID: 24176641 DOI: 10.1016/j.devcel.2013.09.024] [Citation(s) in RCA: 121] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2013] [Revised: 08/27/2013] [Accepted: 09/26/2013] [Indexed: 12/27/2022]
Abstract
Like membranous organelles, large-scale coassembly of macromolecules can organize functions in cells. Ribonucleoproteins (RNPs) can form liquid or solid aggregates, but control and consequences of these RNP states in living, developing tissue are poorly understood. Here, we show that regulated RNP factor interactions drive transitions among diffuse, semiliquid, or solid states to modulate RNP sorting and exchange in the Caenorhabditis elegans oocyte cytoplasm. Translation repressors induce an intrinsic capacity of RNP components to coassemble into either large semiliquids or solid lattices, whereas a conserved RNA helicase prevents polymerization into nondynamic solids. Developmental cues dramatically alter both fluidity and sorting within large RNP assemblies, inducing a transition from RNP segregation in quiescent oocytes to dynamic exchange in the early embryo. Therefore, large-scale organization of gene expression extends to the cytoplasm, where regulation of supramolecular states imparts specific patterns of RNP dynamics.
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Affiliation(s)
- Arnaud Hubstenberger
- Department of Cell and Developmental Biology, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
| | - Scott L Noble
- Department of Cell and Developmental Biology, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA; Graduate Program in Molecular Biology, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
| | - Cristiana Cameron
- Department of Cell and Developmental Biology, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
| | - Thomas C Evans
- Department of Cell and Developmental Biology, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA.
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10
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Hubstenberger A, Cameron C, Shtofman R, Gutman S, Evans TC. A network of PUF proteins and Ras signaling promote mRNA repression and oogenesis in C. elegans. Dev Biol 2012; 366:218-31. [PMID: 22542599 PMCID: PMC3361503 DOI: 10.1016/j.ydbio.2012.03.019] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2011] [Revised: 02/21/2012] [Accepted: 03/19/2012] [Indexed: 11/16/2022]
Abstract
Cell differentiation requires integration of gene expression controls with dynamic changes in cell morphology, function, and control. Post-transcriptional mRNA regulation and signaling systems are important to this process but their mechanisms and connections are unclear. During C. elegans oogenesis, we find that two groups of PUF RNA binding proteins (RNABPs), PUF-3/11 and PUF-5/6/7, control different specific aspects of oocyte formation. PUF-3/11 limits oocyte growth, while PUF-5/6/7 promotes oocyte organization and formation. These two PUF groups repress mRNA translation through overlapping but distinct sets of 3' untranslated regions (3'UTRs). Several PUF-dependent mRNAs encode other mRNA regulators suggesting both PUF groups control developmental patterning of mRNA regulation circuits. Furthermore, we find that the Ras-MapKinase/ERK pathway functions with PUF-5/6/7 to repress specific mRNAs and control oocyte organization and growth. These results suggest that diversification of PUF proteins and their integration with Ras-MAPK signaling modulates oocyte differentiation. Together with other studies, these findings suggest positive and negative interactions between the Ras-MAPK system and PUF RNA-binding proteins likely occur at multiple levels. Changes in these interactions over time can influence spatiotemporal patterning of tissue development.
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Affiliation(s)
- Arnaud Hubstenberger
- Department of Cell and Developmental Biology, University of Colorado Anschutz Medical Campus, Aurora CO 80045
| | - Cristiana Cameron
- Department of Cell and Developmental Biology, University of Colorado Anschutz Medical Campus, Aurora CO 80045
| | - Rebecca Shtofman
- Department of Cell and Developmental Biology, University of Colorado Anschutz Medical Campus, Aurora CO 80045
| | - Shiri Gutman
- Program in Cell biology, Stem Cells, and Development, University of Colorado Anschutz Medical Campus, Aurora CO 80045
- Department of Cell and Developmental Biology, University of Colorado Anschutz Medical Campus, Aurora CO 80045
| | - Thomas C. Evans
- Department of Cell and Developmental Biology, University of Colorado Anschutz Medical Campus, Aurora CO 80045
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Merle N, Féraud O, Gilquin B, Hubstenberger A, Kieffer-Jacquinot S, Assard N, Bennaceur-Griscelli A, Honnorat J, Baudier J. ATAD3B is a human embryonic stem cell specific mitochondrial protein, re-expressed in cancer cells, that functions as dominant negative for the ubiquitous ATAD3A. Mitochondrion 2012; 12:441-8. [PMID: 22664726 DOI: 10.1016/j.mito.2012.05.005] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2012] [Revised: 05/03/2012] [Accepted: 05/25/2012] [Indexed: 02/07/2023]
Abstract
Here we report on the identification of a human pluripotent embryonic stem cell (hESC) specific mitochondrial protein that is re-expressed in cancer cells, ATAD3B. ATAD3B belongs to the AAA+ ATPase ATAD3 protein family of mitochondrial proteins specific to multicellular eukaryotes. Using loss- and gain-of-function approaches, we show that ATAD3B associates with the ubiquitous ATAD3A species, negatively regulates the interaction of ATAD3A with matrix nucleoid complexes and contributes to a mitochondria fragmentation phenotype. We conclude that ATAD3B is a negative regulator of ATAD3A and may function as an adaptor of mitochondrial homeostasis and metabolism in hESCs and cancer cells.
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Affiliation(s)
- Nicolas Merle
- INSERM Unité 1038 and INSERM U873, 17 rue des Martyrs, 38054 Grenoble, France
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Hubstenberger A, Merle N, Charton R, Brandolin G, Rousseau D. Topological analysis of ATAD3A insertion in purified human mitochondria. J Bioenerg Biomembr 2010; 42:143-50. [PMID: 20349121 DOI: 10.1007/s10863-010-9269-8] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2009] [Accepted: 02/03/2010] [Indexed: 01/08/2023]
Abstract
ATAD3 is a mitochondrial inner membrane-associated protein that has been predicted to be an ATPase but from which no associated function is known. The topology of ATAD3 in mitochondrial membranes is not clear and subject to controversy. A direct interaction of the N-terminal domain (amino-acids 44-247) with the mtDNA has been described, but the same domain has been reported to be sensitive to limited proteolysis in purified mitochondria. Furthermore, ATAD3 has been found in a large purified nucleoid complex but could not be cross-linked to the nucleoid. To resolve these discrepancies we used two immunological approaches to test whether the N-terminal (amino-acids 40-53) and the C-terminal (amino-acids 572-586) regions of ATAD3 are accessible from the cytosol. Using N-terminal and C-terminal specific anti-peptide antibodies, we carried out back-titration ELISA measurements and immuno-fluorescence analysis on freshly purified human mitochondria. Both approaches showed that the N-terminal region of ATAD3A is accessible to antibodies in purified mitochondria. The N-terminal region of ATAD3A is thus probably in the cytoplasm or in an accessible intermembrane space. On the contrary, the C-terminal region is not accessible to the antibody and is probably located within the matrix. These results demonstrate both that the N-terminal part of ATAD3A is outside the inner membrane and that the C-terminal part is inside the matrix.
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Affiliation(s)
- Arnaud Hubstenberger
- Department of Cell and Developmental Biology, University of Wisconsin, 1988 UCD at Fitzsimons RC-1 South, PO Box 6511, Mail Stop 8108, Aurora, CO 80045, USA
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