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Penzo A, Dubarry M, Brocas C, Zheng M, Mangione RM, Rougemaille M, Goncalves C, Lautier O, Libri D, Simon MN, Géli V, Dubrana K, Palancade B. A R-loop sensing pathway mediates the relocation of transcribed genes to nuclear pore complexes. Nat Commun 2023; 14:5606. [PMID: 37730746 PMCID: PMC10511428 DOI: 10.1038/s41467-023-41345-z] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2023] [Accepted: 08/31/2023] [Indexed: 09/22/2023] Open
Abstract
Nuclear pore complexes (NPCs) have increasingly recognized interactions with the genome, as exemplified in yeast, where they bind transcribed or damaged chromatin. By combining genome-wide approaches with live imaging of model loci, we uncover a correlation between NPC association and the accumulation of R-loops, which are genotoxic structures formed through hybridization of nascent RNAs with their DNA templates. Manipulating hybrid formation demonstrates that R-loop accumulation per se, rather than transcription or R-loop-dependent damages, is the primary trigger for relocation to NPCs. Mechanistically, R-loop-dependent repositioning involves their recognition by the ssDNA-binding protein RPA, and SUMO-dependent interactions with NPC-associated factors. Preventing R-loop-dependent relocation leads to lethality in hybrid-accumulating conditions, while NPC tethering of a model hybrid-prone locus attenuates R-loop-dependent genetic instability. Remarkably, this relocation pathway involves molecular factors similar to those required for the association of stalled replication forks with NPCs, supporting the existence of convergent mechanisms for sensing transcriptional and genotoxic stresses.
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Affiliation(s)
- Arianna Penzo
- Université Paris Cité, CNRS, Institut Jacques Monod, F-75013, Paris, France
| | - Marion Dubarry
- Marseille Cancer Research Center (CRCM), U1068, Institut National de la Santé et de la Recherche Médicale (INSERM), UMR7258, Centre National de la Recherche Scientifique (CNRS), Aix Marseille University, Institut Paoli-Calmettes, Equipe Labélisée Ligue, 13273, Marseille, France
- Univ Lyon, Université Claude Bernard Lyon 1, INSA-Lyon, CNRS, UMR5240, Microbiologie, Adaptation et Pathogénie, F-69622, Villeurbanne, France
| | - Clémentine Brocas
- Université Paris Cité, Université Paris-Saclay, INSERM, iRCM/IBFJ CEA, UMR Stabilité Génétique Cellules Souches et Radiations, Fontenay-aux-Roses, France
| | - Myriam Zheng
- Université Paris Cité, CNRS, Institut Jacques Monod, F-75013, Paris, France
| | - Raphaël M Mangione
- Université Paris Cité, CNRS, Institut Jacques Monod, F-75013, Paris, France
| | - Mathieu Rougemaille
- Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC), 91198, Gif-sur-Yvette, France
| | - Coralie Goncalves
- Université Paris Cité, CNRS, Institut Jacques Monod, F-75013, Paris, France
| | - Ophélie Lautier
- Université Paris Cité, CNRS, Institut Jacques Monod, F-75013, Paris, France
| | - Domenico Libri
- Institut de Génétique Moléculaire de Montpellier, Univ Montpellier, CNRS, Montpellier, France
| | - Marie-Noëlle Simon
- Marseille Cancer Research Center (CRCM), U1068, Institut National de la Santé et de la Recherche Médicale (INSERM), UMR7258, Centre National de la Recherche Scientifique (CNRS), Aix Marseille University, Institut Paoli-Calmettes, Equipe Labélisée Ligue, 13273, Marseille, France
| | - Vincent Géli
- Marseille Cancer Research Center (CRCM), U1068, Institut National de la Santé et de la Recherche Médicale (INSERM), UMR7258, Centre National de la Recherche Scientifique (CNRS), Aix Marseille University, Institut Paoli-Calmettes, Equipe Labélisée Ligue, 13273, Marseille, France
| | - Karine Dubrana
- Université Paris Cité, Université Paris-Saclay, INSERM, iRCM/IBFJ CEA, UMR Stabilité Génétique Cellules Souches et Radiations, Fontenay-aux-Roses, France
| | - Benoit Palancade
- Université Paris Cité, CNRS, Institut Jacques Monod, F-75013, Paris, France.
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Aguilera P, Dubarry M, Géli V, Simon MN. NPCs and APBs: two HUBs of non-canonical homology-based recombination at telomeres? Cell Cycle 2023; 22:1163-1168. [PMID: 37128641 DOI: 10.1080/15384101.2023.2206350] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/03/2023] Open
Abstract
Apart from a few rare exceptions, the maintenance of functional telomeres by recombination-based mechanisms is restricted to accidental and/or pathological situations. Originally described in the yeast S. cerevisiae, this mode of telomere repair has gained interest with the discovery of telomerase negative cancers that use alternative lengthening of telomeres (ALT cancer) dependent on homologous recombination. In both yeast and humans, it has been shown that recombination at telomeres is spatially regulated and occurs preferentially at the nuclear pore complexes (NPCs) in yeast and at ALT-associated promyelocytic leukemia nuclear bodies (APBs) in human cells. Here, we discuss the potential relationships between these two membrane-less structures and their role in enabling unconventional recombination pathways.
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Affiliation(s)
- Paula Aguilera
- MAP Laboratory, INSA Lyon, Claude Bernard University UMR5240, Villeurbanne, France
| | - Marion Dubarry
- Marseille Cancer Research Center (CRCM), U1068 Inserm, UMR7258 CNRS, Institut Paoli-Calmettes, Equipe labellisee Ligue, Aix Marseille University, Marseille, France
| | - Vincent Géli
- Centro Andaluz de Biologia Molecular y Medicina Regenerativa (CABIMER), Consejo Superior de Investigaciones Cientificas (CSIC), Universidad de Sevilla, Universidad Pablo de Olavide, Seville, Spain
| | - Marie-Noëlle Simon
- Centro Andaluz de Biologia Molecular y Medicina Regenerativa (CABIMER), Consejo Superior de Investigaciones Cientificas (CSIC), Universidad de Sevilla, Universidad Pablo de Olavide, Seville, Spain
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3
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Aguilera P, Dubarry M, Hardy J, Lisby M, Simon MN, Géli V. Telomeric C-circles localize at nuclear pore complexes in Saccharomyces cerevisiae. EMBO J 2022; 41:e108736. [PMID: 35147992 PMCID: PMC8922269 DOI: 10.15252/embj.2021108736] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [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: 05/17/2021] [Revised: 01/17/2022] [Accepted: 01/21/2022] [Indexed: 11/09/2022] Open
Abstract
As in human cells, yeast telomeres can be maintained in cells lacking telomerase activity by recombination-based mechanisms known as ALT (Alternative Lengthening of Telomeres). A hallmark of ALT human cancer cells are extrachromosomal telomeric DNA elements called C-circles, whose origin and function have remained unclear. Here, we show that extrachromosomal telomeric C-circles in yeast can be detected shortly after senescence crisis and concomitantly with the production of survivors arising from "type II" recombination events. We uncover that C-circles bind to the nuclear pore complex (NPC) and to the SAGA-TREX2 complex, similar to other non-centromeric episomal DNA. Disrupting the integrity of the SAGA/TREX2 complex affects both C-circle binding to NPCs and type II telomere recombination, suggesting that NPC tethering of C-circles facilitates formation and/or propagation of the long telomere repeats characteristic of type II survivors. Furthermore, we find that disruption of the nuclear diffusion barrier impairs type II recombination. These results support a model in which concentration of C-circles at NPCs benefits type II telomere recombination, highlighting the importance of spatial coordination in ALT-type mechanisms of telomere maintenance.
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Affiliation(s)
- Paula Aguilera
- Marseille Cancer Research Center (CRCM), U1068 Inserm, UMR7258 CNRS, Institut Paoli-Calmettes, Equipe labellisée Ligue, Aix Marseille University, Marseille, France
| | - Marion Dubarry
- Marseille Cancer Research Center (CRCM), U1068 Inserm, UMR7258 CNRS, Institut Paoli-Calmettes, Equipe labellisée Ligue, Aix Marseille University, Marseille, France
| | - Julien Hardy
- Marseille Cancer Research Center (CRCM), U1068 Inserm, UMR7258 CNRS, Institut Paoli-Calmettes, Equipe labellisée Ligue, Aix Marseille University, Marseille, France
| | - Michael Lisby
- Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Marie-Noëlle Simon
- Marseille Cancer Research Center (CRCM), U1068 Inserm, UMR7258 CNRS, Institut Paoli-Calmettes, Equipe labellisée Ligue, Aix Marseille University, Marseille, France
| | - Vincent Géli
- Marseille Cancer Research Center (CRCM), U1068 Inserm, UMR7258 CNRS, Institut Paoli-Calmettes, Equipe labellisée Ligue, Aix Marseille University, Marseille, France
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Sessegolo C, Cruaud C, Da Silva C, Cologne A, Dubarry M, Derrien T, Lacroix V, Aury JM. Transcriptome profiling of mouse samples using nanopore sequencing of cDNA and RNA molecules. Sci Rep 2019; 9:14908. [PMID: 31624302 PMCID: PMC6797730 DOI: 10.1038/s41598-019-51470-9] [Citation(s) in RCA: 56] [Impact Index Per Article: 11.2] [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: 03/20/2019] [Accepted: 09/28/2019] [Indexed: 01/27/2023] Open
Abstract
Our vision of DNA transcription and splicing has changed dramatically with the introduction of short-read sequencing. These high-throughput sequencing technologies promised to unravel the complexity of any transcriptome. Generally gene expression levels are well-captured using these technologies, but there are still remaining caveats due to the limited read length and the fact that RNA molecules had to be reverse transcribed before sequencing. Oxford Nanopore Technologies has recently launched a portable sequencer which offers the possibility of sequencing long reads and most importantly RNA molecules. Here we generated a full mouse transcriptome from brain and liver using the Oxford Nanopore device. As a comparison, we sequenced RNA (RNA-Seq) and cDNA (cDNA-Seq) molecules using both long and short reads technologies and tested the TeloPrime preparation kit, dedicated to the enrichment of full-length transcripts. Using spike-in data, we confirmed that expression levels are efficiently captured by cDNA-Seq using short reads. More importantly, Oxford Nanopore RNA-Seq tends to be more efficient, while cDNA-Seq appears to be more biased. We further show that the cDNA library preparation of the Nanopore protocol induces read truncation for transcripts containing internal runs of T’s. This bias is marked for runs of at least 15 T’s, but is already detectable for runs of at least 9 T’s and therefore concerns more than 20% of expressed transcripts in mouse brain and liver. Finally, we outline that bioinformatics challenges remain ahead for quantifying at the transcript level, especially when reads are not full-length. Accurate quantification of repeat-associated genes such as processed pseudogenes also remains difficult, and we show that current mapping protocols which map reads to the genome largely over-estimate their expression, at the expense of their parent gene.
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Affiliation(s)
- Camille Sessegolo
- Univ Lyon, Université Lyon 1, CNRS, Laboratoire de Biométrie et Biologie Évolutive UMR5558, F-69622, Villeurbanne, France.,EPI ERABLE - Inria Grenoble, Rhône-Alpes, France
| | - Corinne Cruaud
- Genoscope, Institut de biologie François-Jacob, Commissariat a l'Energie Atomique (CEA), Université Paris-Saclay, F-91057, Evry, France
| | - Corinne Da Silva
- Genoscope, Institut de biologie François-Jacob, Commissariat a l'Energie Atomique (CEA), Université Paris-Saclay, F-91057, Evry, France
| | - Audric Cologne
- Univ Lyon, Université Lyon 1, CNRS, Laboratoire de Biométrie et Biologie Évolutive UMR5558, F-69622, Villeurbanne, France.,EPI ERABLE - Inria Grenoble, Rhône-Alpes, France
| | - Marion Dubarry
- Genoscope, Institut de biologie François-Jacob, Commissariat a l'Energie Atomique (CEA), Université Paris-Saclay, F-91057, Evry, France
| | - Thomas Derrien
- Univ Rennes, CNRS, IGDR (Institut de génétique et développement de Rennes) - UMR 6290, F-35000, Rennes, France
| | - Vincent Lacroix
- Univ Lyon, Université Lyon 1, CNRS, Laboratoire de Biométrie et Biologie Évolutive UMR5558, F-69622, Villeurbanne, France.,EPI ERABLE - Inria Grenoble, Rhône-Alpes, France
| | - Jean-Marc Aury
- Genoscope, Institut de biologie François-Jacob, Commissariat a l'Energie Atomique (CEA), Université Paris-Saclay, F-91057, Evry, France.
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Belser C, Istace B, Denis E, Dubarry M, Baurens FC, Falentin C, Genete M, Berrabah W, Chèvre AM, Delourme R, Deniot G, Denoeud F, Duffé P, Engelen S, Lemainque A, Manzanares-Dauleux M, Martin G, Morice J, Noel B, Vekemans X, D'Hont A, Rousseau-Gueutin M, Barbe V, Cruaud C, Wincker P, Aury JM. Chromosome-scale assemblies of plant genomes using nanopore long reads and optical maps. Nat Plants 2018; 4:879-887. [PMID: 30390080 DOI: 10.1038/s41477-018-0289-4] [Citation(s) in RCA: 208] [Impact Index Per Article: 34.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Accepted: 09/24/2018] [Indexed: 05/19/2023]
Abstract
Plant genomes are often characterized by a high level of repetitiveness and polyploid nature. Consequently, creating genome assemblies for plant genomes is challenging. The introduction of short-read technologies 10 years ago substantially increased the number of available plant genomes. Generally, these assemblies are incomplete and fragmented, and only a few are at the chromosome scale. Recently, Pacific Biosciences and Oxford Nanopore sequencing technologies were commercialized that can sequence long DNA fragments (kilobases to megabase) and, using efficient algorithms, provide high-quality assemblies in terms of contiguity and completeness of repetitive regions1-4. However, even though genome assemblies based on long reads exhibit high contig N50s (>1 Mb), these methods are still insufficient to decipher genome organization at the chromosome level. Here, we describe a strategy based on long reads (MinION or PromethION sequencers) and optical maps (Saphyr system) that can produce chromosome-level assemblies and demonstrate applicability by generating high-quality genome sequences for two new dicotyledon morphotypes, Brassica rapa Z1 (yellow sarson) and Brassica oleracea HDEM (broccoli), and one new monocotyledon, Musa schizocarpa (banana). All three assemblies show contig N50s of >5 Mb and contain scaffolds that represent entire chromosomes or chromosome arms.
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Affiliation(s)
- Caroline Belser
- Genoscope, Institut de biologie François-Jacob, Commissariat à l'Energie Atomique (CEA), Université Paris-Saclay, Evry, France
| | - Benjamin Istace
- Genoscope, Institut de biologie François-Jacob, Commissariat à l'Energie Atomique (CEA), Université Paris-Saclay, Evry, France
| | - Erwan Denis
- Genoscope, Institut de biologie François-Jacob, Commissariat à l'Energie Atomique (CEA), Université Paris-Saclay, Evry, France
| | - Marion Dubarry
- Genoscope, Institut de biologie François-Jacob, Commissariat à l'Energie Atomique (CEA), Université Paris-Saclay, Evry, France
| | - Franc-Christophe Baurens
- CIRAD, UMR AGAP, Montpellier, France
- AGAP, Université Montpellier, CIRAD, INRA, Montpellier SupAgro, Montpellier, France
| | - Cyril Falentin
- IGEPP, INRA, Agrocampus Ouest, Université Rennes 1, BP35327, Le Rheu, France
| | - Mathieu Genete
- Université Lille, CNRS, UMR 8198-Evo-Eco-Paleo, Lille, France
| | - Wahiba Berrabah
- Genoscope, Institut de biologie François-Jacob, Commissariat à l'Energie Atomique (CEA), Université Paris-Saclay, Evry, France
| | - Anne-Marie Chèvre
- IGEPP, INRA, Agrocampus Ouest, Université Rennes 1, BP35327, Le Rheu, France
| | - Régine Delourme
- IGEPP, INRA, Agrocampus Ouest, Université Rennes 1, BP35327, Le Rheu, France
| | - Gwenaëlle Deniot
- IGEPP, INRA, Agrocampus Ouest, Université Rennes 1, BP35327, Le Rheu, France
| | - France Denoeud
- Génomique Métabolique, Genoscope, Institut de biologie François Jacob, CEA, CNRS, Université d'Evry, Université Paris-Saclay, Evry, France
| | - Philippe Duffé
- IGEPP, INRA, Agrocampus Ouest, Université Rennes 1, BP35327, Le Rheu, France
| | - Stefan Engelen
- Genoscope, Institut de biologie François-Jacob, Commissariat à l'Energie Atomique (CEA), Université Paris-Saclay, Evry, France
| | - Arnaud Lemainque
- Genoscope, Institut de biologie François-Jacob, Commissariat à l'Energie Atomique (CEA), Université Paris-Saclay, Evry, France
| | | | - Guillaume Martin
- CIRAD, UMR AGAP, Montpellier, France
- AGAP, Université Montpellier, CIRAD, INRA, Montpellier SupAgro, Montpellier, France
| | - Jérôme Morice
- IGEPP, INRA, Agrocampus Ouest, Université Rennes 1, BP35327, Le Rheu, France
| | - Benjamin Noel
- Genoscope, Institut de biologie François-Jacob, Commissariat à l'Energie Atomique (CEA), Université Paris-Saclay, Evry, France
| | - Xavier Vekemans
- Université Lille, CNRS, UMR 8198-Evo-Eco-Paleo, Lille, France
| | - Angélique D'Hont
- CIRAD, UMR AGAP, Montpellier, France
- AGAP, Université Montpellier, CIRAD, INRA, Montpellier SupAgro, Montpellier, France
| | | | - Valérie Barbe
- Genoscope, Institut de biologie François-Jacob, Commissariat à l'Energie Atomique (CEA), Université Paris-Saclay, Evry, France
| | - Corinne Cruaud
- Genoscope, Institut de biologie François-Jacob, Commissariat à l'Energie Atomique (CEA), Université Paris-Saclay, Evry, France
| | - Patrick Wincker
- Génomique Métabolique, Genoscope, Institut de biologie François Jacob, CEA, CNRS, Université d'Evry, Université Paris-Saclay, Evry, France
| | - Jean-Marc Aury
- Genoscope, Institut de biologie François-Jacob, Commissariat à l'Energie Atomique (CEA), Université Paris-Saclay, Evry, France.
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Narayanan S, Dubarry M, Lawless C, Banks AP, Wilkinson DJ, Whitehall SK, Lydall D. Quantitative Fitness Analysis Identifies exo1∆ and Other Suppressors or Enhancers of Telomere Defects in Schizosaccharomyces pombe. PLoS One 2015; 10:e0132240. [PMID: 26168240 PMCID: PMC4500466 DOI: 10.1371/journal.pone.0132240] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2015] [Accepted: 06/11/2015] [Indexed: 01/28/2023] Open
Abstract
Synthetic genetic array (SGA) has been successfully used to identify genetic interactions in S. cerevisiae and S. pombe. In S. pombe, SGA methods use either cycloheximide (C) or heat shock (HS) to select double mutants before measuring colony size as a surrogate for fitness. Quantitative Fitness Analysis (QFA) is a different method for determining fitness of microbial strains. In QFA, liquid cultures are spotted onto solid agar and growth curves determined for each spot by photography and model fitting. Here, we compared the two S. pombe SGA methods and found that the HS method was more reproducible for us. We also developed a QFA procedure for S. pombe. We used QFA to identify genetic interactions affecting two temperature sensitive, telomere associated query mutations (taz1Δ and pot1-1). We identify exo1∆ and other gene deletions as suppressors or enhancers of S. pombe telomere defects. Our study identifies known and novel gene deletions affecting the fitness of strains with telomere defects. The interactions we identify may be relevant in human cells.
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Affiliation(s)
- Siddharth Narayanan
- Institute for Cell & Molecular Biosciences, Newcastle University Medical School, Newcastle upon Tyne, NE2 4HH, United Kingdom
| | - Marion Dubarry
- Institute for Cell & Molecular Biosciences, Newcastle University Medical School, Newcastle upon Tyne, NE2 4HH, United Kingdom
| | - Conor Lawless
- Institute for Cell & Molecular Biosciences, Newcastle University Medical School, Newcastle upon Tyne, NE2 4HH, United Kingdom
| | - A. Peter Banks
- High Throughput Screening Facility, Newcastle Biomedicine, Newcastle University, Newcastle upon Tyne, NE2 4HH, United Kingdom
| | - Darren J. Wilkinson
- School of Mathematics & Statistics, Newcastle University, Newcastle upon Tyne, NE1 7RU, United Kingdom
| | - Simon K. Whitehall
- Institute for Cell & Molecular Biosciences, Newcastle University Medical School, Newcastle upon Tyne, NE2 4HH, United Kingdom
| | - David Lydall
- Institute for Cell & Molecular Biosciences, Newcastle University Medical School, Newcastle upon Tyne, NE2 4HH, United Kingdom
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Abstract
Single-stranded DNA (ssDNA) at DNA ends is an important regulator of the DNA damage response. Resection, the generation of ssDNA, affects DNA damage checkpoint activation, DNA repair pathway choice, ssDNA-associated mutation and replication fork stability. In eukaryotes, extensive DNA resection requires the nuclease Exo1 and nuclease/helicase pair: Dna2 and Sgs1BLM. How Exo1 and Dna2-Sgs1BLM coordinate during resection remains poorly understood. The DNA damage checkpoint clamp (the 9-1-1 complex) has been reported to play an important role in stimulating resection but the exact mechanism remains unclear. Here we show that the human 9-1-1 complex enhances the cleavage of DNA by both DNA2 and EXO1 in vitro, showing that the resection-stimulatory role of the 9-1-1 complex is direct. We also show that in Saccharomyces cerevisiae, the 9-1-1 complex promotes both Dna2-Sgs1 and Exo1-dependent resection in response to uncapped telomeres. Our results suggest that the 9-1-1 complex facilitates resection by recruiting both Dna2-Sgs1 and Exo1 to sites of resection. This activity of the 9-1-1 complex in supporting resection is strongly inhibited by the checkpoint adaptor Rad953BP1. Our results provide important mechanistic insights into how DNA resection is regulated by checkpoint proteins and have implications for genome stability in eukaryotes.
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Affiliation(s)
- Greg H P Ngo
- Institute for Cell and Molecular Biosciences (ICaMB), Medical School, Newcastle University, Newcastle upon Tyne, NE2 4HH, UK
| | - Lata Balakrishnan
- Department of Biochemistry and Biophysics, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642, USA
| | - Marion Dubarry
- Institute for Cell and Molecular Biosciences (ICaMB), Medical School, Newcastle University, Newcastle upon Tyne, NE2 4HH, UK
| | - Judith L Campbell
- Divisions of Biology and Chemistry, Caltech, Braun Laboratories, Pasadena, CA 91125, USA
| | - David Lydall
- Institute for Cell and Molecular Biosciences (ICaMB), Medical School, Newcastle University, Newcastle upon Tyne, NE2 4HH, UK
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Loïodice I, Dubarry M, Taddei A. Scoring and manipulating gene position and dynamics using FROS in budding yeast. Curr Protoc Cell Biol 2014; 62:22.17.1-22.17.14. [PMID: 24610125 DOI: 10.1002/0471143030.cb2217s62] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The spatial organization of the genome within the nucleus is now seen as a key contributor to genome function. Studying chromatin dynamics in living cells has been rendered possible by the development of fast microscopy coupled with fluorescent repressor operator systems (FROS). In these systems, arrays of protein-binding sites integrated at specific loci by homologous recombination are monitored through the fluorescence of tagged DNA-binding proteins. In the budding yeast, where homologous recombination is efficient, this technique, combined with targeting assay and genetic analysis, has been extremely powerful for studying the determinants and function of chromatin dynamics in living cells. However, issues have been recurrently raised in different species regarding the use of these systems. Here we discuss the different uses of gene tagging with FROS and their limitations, focusing in budding yeast as a model organism.
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Affiliation(s)
- Isabelle Loïodice
- Institut Curie, Centre de Recherche, Paris, France.,Centre National de la Recherche Scientifique (CNRS), UMR 3364, Paris, France.,Université Pierre-et-Marie-Curie (UPMC), UMR 3664, Paris, France
| | - Marion Dubarry
- Université Pierre-et-Marie-Curie (UPMC), UMR 3664, Paris, France.,Institute for Cell and Molecular Biosciences, Medical School, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Angela Taddei
- Institut Curie, Centre de Recherche, Paris, France.,Centre National de la Recherche Scientifique (CNRS), UMR 3364, Paris, France.,Université Pierre-et-Marie-Curie (UPMC), UMR 3664, Paris, France
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9
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Ruault M, Dubarry M, Taddei A. Re-positioning genes to the nuclear envelope in mammalian cells: impact on transcription. Trends Genet 2008; 24:574-81. [PMID: 18819723 DOI: 10.1016/j.tig.2008.08.008] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2008] [Revised: 08/14/2008] [Accepted: 08/18/2008] [Indexed: 12/31/2022]
Abstract
The spatial organization of the genome within the nucleus is thought to contribute to genome functions. A key component of the nuclear architecture is the nuclear envelope, which is often associated with inactive chromatin. Studies in budding yeast indicate that nuclear position can directly affect gene function. However, the causal relationship between gene position and gene activity in mammalian cells has been more elusive. Several groups recently addressed this issue by tethering genes to the inner nuclear membrane. Their studies show that the nuclear periphery is not refractory to gene transcription, but can modulate the activity of certain genes. The 3D organization of the genome might, thus, provide an additional level of regulation necessary for fine-tuning gene expression.
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Affiliation(s)
- Myriam Ruault
- Compartimentation et Dynamique des Fonctions Nucléaires, UMR218, Centre National de la Recherche Scientifique, Institut Curie, 26 Rue d'Ulm, 75248 Paris Cedex 05, France
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Dubarry M, Gaubicher J, Guyomard D, Wallez G, Quarton M, Baehtz C. Uncommon potential hysteresis in the Li/Li2xVO(H2−xPO4)2 (0≤x≤2) system. Electrochim Acta 2008. [DOI: 10.1016/j.electacta.2007.12.085] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Fosset S, Fromentin G, Gietzen DW, Dubarry M, Huneau JF, Antoine JM, Lang V, Mathieu-Casseron F, Tomé D. Peptide fragments released from Phe-caseinomacropeptide in vivo in the rat. Peptides 2002; 23:1773-81. [PMID: 12383865 DOI: 10.1016/s0196-9781(02)00134-1] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The aim of this study was to investigate the pharmacokinetics of bovine Phe-caseinomacropeptide (Phe-CMP) in the rat after oral administration. This polypeptide was monophosphorylated and mainly nonglycosylated: Phe-CMP-1P. During gastrointestinal digestion and absorption, Phe-CMP-1P was degraded. Intact Phe-CMP-1P and CMP-1P were rapidly released from the stomach. In contrast, partial hydrolysis by pancreatic enzymes was observed. In vitro hydrolysis by brush-border membrane vesicles also indicated that the peptide was degraded. In the blood, "CMP-immunoreactive material" appeared rapidly, reaching a maximum level of 5.5 microg/ml at 60 min.
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Affiliation(s)
- S Fosset
- Unité INRA/INAPG de Physiologie de la Nutrition et du Comportement Alimentaire, Institut National Agronomique de Paris-Grignon, 16 rue Claude Bernard, F-75231 Paris Cedex 05, France
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12
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Abstract
Lactoferrin (Lf) is a milk iron-binding glycoprotein that plays a role in iron transport and acts as both a bacteriostatic and a growth modulating agent. The aim of this study was to investigate the nature of immune responses induced by repeated oral administration of bovine milk Lf in mice. Groups of ten female BALB/c mice were fed daily for 4 weeks with two doses of protein antigen: a low (0.05 mg/g body weight per d) or high (1 mg/g body weight per d) dose of Lf, or water as a control. A fourth group was immunized intramuscularly with 0.01 mg Lf in complete Freund's adjuvant. Anti-Lf IgA and IgG were detected in the intestinal fluid and serum of mice given Lf. Total immunoglobulins were higher in the intestinal fluid in Lf groups than in the control group. No difference could be detected in the serum. IgA and IgG secretion was enhanced in Peyer's patches and spleen from Lf-fed mice, in comparison with controls. [3H]thymidine uptake into Peyer's patch and spleen cells from both control and Lf-fed mice was enhanced by 75 micrograms Lf/ml in vitro, but Lf groups had a greater proliferation rate than the control group. These findings suggested that Lf could act as an immunostimulating factor on the mucosal immune system and that activation of the mucosal immune system is dependent on the ability of Lf to bind to the intestinal mucosa.
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Affiliation(s)
- H Debbabi
- Unité INRA de Nutrition Humaine et de Physiologie Intestinale, Institut National Agronomique Paris-Grignon, Paris, France
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13
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Ben Ghanem A, Winchenne JJ, Lopez C, Chrétien S, Dubarry M, Craescu CT, Le Caer JP, Casadevall N, Rouger P, Cartron JP. Purification and biological activity of a recombinant human erythropoietin produced by lymphoblastoid cells. Prep Biochem 1994; 24:127-42. [PMID: 8072955 DOI: 10.1080/10826069408010087] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
A recombinant human erythropoietin (rH-EPO) was obtained from the culture supernatants of human B-lymphoblastoid cells transfected by the human EPO gene. rH-EPO was purified by a two-step method based on immunoaffinity and ion exchange chromatography. The first step was achieved by an anti-EPO monoclonal antibody (Mab). This Mab, immobilized on Sepharose 4B, allowed a 410-fold purification of the protein. The second step consisted of ion exchange chromatography on DEAE Sephacel. The combination of these two steps results in a highly purified rH-EPO with a global yield of about 50%; the specific activity of the protein was 176,000 IU/A280. The NMR spectrum was characteristic for a well structured, single-conformation protein. The purified protein was analyzed by SDS-PAGE and isoelectric focusing. The biological activity of purified rH-EPO was measured in vivo, by the incorporation of 59Fe into red blood cells (RBC) of polycythemic mice and in vitro by the proliferative response of an EPO-dependent cell line. The purified protein expressed in lymphoblastoid cells of human origin had the same biological activity as that of urinary EPO and rH-EPO produced in other mammalian cells.
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Affiliation(s)
- A Ben Ghanem
- Institut National de Transfusion Sanguine, Paris, France
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14
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Dubarry M, Charron C, Habibi B, Bretagne Y, Lambin P. Quantitation of immunoglobulin classes and subclasses of autoantibodies bound to red cells in patients with and without hemolysis. Transfusion 1993; 33:466-71. [PMID: 8516789 DOI: 10.1046/j.1537-2995.1993.33693296807.x] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The concentration of IgG, IgA, and IgM, as well as IgG subclasses, was measured by an enzyme-linked immunosorbent assay in autoantibodies eluted from red cells (RBCs); the number of molecules of each isotype per RBC was calculated. Three groups were analyzed: Group 1 included 23 patients with autoimmune hemolytic anemia (AIHA) associated with warm autoantibodies of IgG class; Group 2 included 11 patients without anemia but with a positive direct antiglobulin test (DAT); Group 3 included 10 healthy DAT-negative subjects. The mean number of IgG molecules per RBC in Group 1 (920) was about three times that in Group 2 (306) and about 17 times that in Group 3 (54). The range of RBC-bound IgG showed an overlap between the two groups of patients. The mean number of IgM and IgA molecules per RBC was low in the three groups. IgG1 predominated in all groups except in two patients with AIHA, in whom IgG3 made up at least 50 percent of total IgG. The mean number of IgG1, IgG2, and IgG4 molecules per RBC in Group 1 was about three times that in Group 2, whereas the mean number of IgG3 molecules per RBC was 10 times as high (p < 0.001). It follows that IgG3 was more common in patients of Group 1, but it was also detected in patients of Group 2.
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Affiliation(s)
- M Dubarry
- Laboratoire d'Immunochimie, Institut National de Transfusion Sanguine, Paris, France
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15
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Affiliation(s)
- J Babinet
- Centre de Transfusion Sanguine, Groupe Hospitalier Pitié-Salpêtrière, Paris, France
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16
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Lambin P, Gervais A, Levy M, Defendini E, Dubarry M, Lebon P, Rouger P, Schuller E. Intrathecal synthesis of IgG subclasses in multiple sclerosis and in acquired immunodeficiency syndrome (AIDS). J Neuroimmunol 1991; 35:179-89. [PMID: 1955566 DOI: 10.1016/0165-5728(91)90172-4] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Serum and cerebrospinal fluid (CSF) of 50 neurological patients (24 multiple sclerosis (MS), ten acquired immunodeficiency syndrome (AIDS) and 16 other neurological diseases (OND)) and ten controls were analyzed by enzyme-linked immunosorbent assay (ELISA) for IgG subclass quantification and for the calculation of intrathecal synthesis (ITS). Total IgG was determined by two methods: electroimmunodiffusion (EID) and ELISA. A highly significant correlation was established between both methods. The existence of ITS was proved by the IgG/albumin ratio, the IgG index, Tourtellotte's formula, and Schuller's formula. In AIDS patients all IgG subclasses showed an increase in the CSF, whereas in sera only the IgG1 was significantly increased. CSF of MS patients showed a predominant increase of IgG1 whereas no significant modification of IgG subclasses was observed in sera. In most of the AIDS patients there was an ITS of IgG1, IgG3 and IgG4, but rarely (3/10) IgG2. In contrast, a polyclonal ITS of IgG was exceptional (1/24) in MS patients. No significant correlation could be established between clinical data and IgG subclass ITS in MS. The variations of each IgG subclass in serum and in ITS were not significantly correlated. Measurement of each IgG subclass and calculation of ITS seems essential in order to analyze any subclass antibody repertory inside the central nervous system.
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Affiliation(s)
- P Lambin
- Laboratoire d'Immunochimie, Institut National de la Transfusion, Sanguine, Paris, France
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17
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Dubarry M, Luilier M, Malot N, Bayard P, Lambin P, Prou O, Monjour L. Enzyme immunoassays for detection of malarial antigens in human plasmas by Plasmodium falciparum monoclonal antibodies. Am J Trop Med Hyg 1990; 43:116-23. [PMID: 2202221 DOI: 10.4269/ajtmh.1990.43.116] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
The screening of blood donors for the detection of dangerous disease carriers is a mandatory requirement for blood transfusion centers. Enzyme immunoassay (EIA) is a suitable method for the examination of large populations. We describe a sandwich EIA allowing the detection of soluble malarial antigens in plasma using 11 mouse monoclonal antibodies. Among the 121 combinations tested, 2 were selected for their sensitivity and specificity. Both were applied to plasmas of (a) acute patients, (b) people living in malarious areas, (c) blood donors at risk (travelers), and (d) sedentary blood donors without risk. With 1 of the 2 combinations, the percentage of positive answers was 68.4% (n = 38) for a, 62.6% (n = 206) for b, 4.5% (n = 398) for c, and 0.8% (n = 485) for d; with the other combination, the percentage of positive answers was 68.4% for a, 46.1% for b, 1.5% for c, and 0% for d. Using 2 combinations simultaneously, the positive results were 94.7% for a, 70.4% for b, 5% for c, and 0.8% for d. The 2 assays are complementary and the pair can be used for maximum Plasmodium falciparum antigen recognition in prospective donors.
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Affiliation(s)
- M Dubarry
- Laboratoire d'Immunochimie, Institut National de Transfusion Sanguine, Paris, France
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18
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Lambin P, Dubarry M, Charron C, Herance N, Defendini E. [Quantitative evaluation of serum IgG subclass levels by an immunoenzyme method]. Rev Fr Transfus Immunohematol 1988; 31:687-96. [PMID: 3238275 DOI: 10.1016/s0338-4535(88)80077-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
We developed a enzyme linked immunosorbent assay (ELISA) for measuring IgG subclasses concentration in serum. For this we used monoclonal antibodies. The specificity of these antibodies was evaluated with a panel of myeloma proteins belonging to the 4 IgG subclasses. The ELISA was sensitive (allowing the detection of subclasses at ng level) and accurate (inter-assay coefficient of variation of 14%). Using the WHO serum 67/97 as reference, we determined the concentration of IgG subclasses in a pool of sera. In addition concentrations were measured in 69 healthy adults to study the distribution of each IgG subclass. A good correlation (r = 0.78) was obtained between the sum of the subclasses measured by ELISA and total IgG measured by immunonephelometry.
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Affiliation(s)
- P Lambin
- Laboratoire d'Immunochimie, Institut National de Transfusion Sanguine, Paris, France
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19
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Salmon S, Goldstein S, Pastier D, Theron L, Berthelier M, Ayrault-Jarrier M, Dubarry M, Rebourcet R, Pau B. Monoclonal antibodies to low density lipoprotein used for the study of low- and very-low-density lipoproteins, in "ELISA" and immunoprecipitation technics. Biochem Biophys Res Commun 1984; 125:704-11. [PMID: 6083790 DOI: 10.1016/0006-291x(84)90596-5] [Citation(s) in RCA: 32] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Seven monoclonal antibodies to low-density lipoprotein were studied by the ELISA for their reactivity with LDL or VLDL. Cotitration experiments showed that five of them are addressed to different antigenic epitopes. Two of the monoclonal antibodies were temperature independent whereas the others had a decreased binding activity at 37 degrees C compared to that obtained at 25 degrees C or 4 degrees C, suggesting the presence of antibodies directed to sequence or conformation epitopes, respectively. All antibodies reacted with both LDL and VLDL; four of them had a higher affinity for LDL and two others for VLDL. Immunoprecipitation of LDL and/or VLDL was observed upon immunodiffusion with certain pairs of antibodies. This may allow the use of pairs of monoclonal antibodies to LDL for the quantitative determination of apolipoprotein B in serum LDL and VLDL.
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Delvinquier B, Goumard P, Dubarry M, Tronchin G, Camus D. Renal deposits of lipoprotein-immunoglobulin complexes in Plasmodium chabaudi-infected mice. The Journal of Immunology 1984. [DOI: 10.4049/jimmunol.133.4.2243] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Abstract
Lipoprotein metabolism is altered and immunoglobulin-lipoprotein complexes (Ig-Lp) are formed during malaria infection (1-5). Ig-Lp were detected in the sera of Plasmodium chabaudi-infected mice 9 days post-infection (1 or 2 days after parasitemia had peaked at about 50%) and reached a maximum on day 13 (when the parasitemia had decreased to less than 1%). Renal glomerular deposits of IgM were first detected at day 3 and were heavy from day 9 to day 29; deposits of IgG and low density lipoprotein (LDL) were present from days 9 to 62, and were more dense from days 22 to 29; deposits of C3 were observed from day 13 to day 29. Apoprotein B component was found in heparin eluates of kidneys on day 10, 14, and 29. Fractionated Ig-Lp, as well as whole sera from day-13 infected mice, were injected into uninfected mice that developed LDL glomerular deposits only when pre-treated with histamine. LDL glomerular deposits were also observed after i.v. injection of day-29 sera (containing free anti-lipoprotein antibody) into day-7 infected mice, but not when a mixture of day-29 and day-7 sera was injected into normal recipient mice. LDL glomerular deposits, however, were observed when recipient mice were treated with the Plasmodium-derived Insoluble Material (PDIM) 3 days before the injection of the day-29-day-7 sera mixture or day-13 serum. Two hours after the i.v. injection of 125I-Ig-Lp, the radioactivity of the kidneys was higher in histamine-treated, PDIM-treated, and P. chabaudi-infected mice than in controls. The clearance of 125I-Ig-Lp was higher in infected and in PDIM-treated mice than in controls. We suggest that the glomerular deposit of Ig-Lp that occurs during P. chabaudi infection requires an enhancing factor such as PDIM that is released during infection.
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21
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Delvinquier B, Goumard P, Dubarry M, Tronchin G, Camus D. Renal deposits of lipoprotein-immunoglobulin complexes in Plasmodium chabaudi-infected mice. J Immunol 1984; 133:2243-9. [PMID: 6470490] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Lipoprotein metabolism is altered and immunoglobulin-lipoprotein complexes (Ig-Lp) are formed during malaria infection (1-5). Ig-Lp were detected in the sera of Plasmodium chabaudi-infected mice 9 days post-infection (1 or 2 days after parasitemia had peaked at about 50%) and reached a maximum on day 13 (when the parasitemia had decreased to less than 1%). Renal glomerular deposits of IgM were first detected at day 3 and were heavy from day 9 to day 29; deposits of IgG and low density lipoprotein (LDL) were present from days 9 to 62, and were more dense from days 22 to 29; deposits of C3 were observed from day 13 to day 29. Apoprotein B component was found in heparin eluates of kidneys on day 10, 14, and 29. Fractionated Ig-Lp, as well as whole sera from day-13 infected mice, were injected into uninfected mice that developed LDL glomerular deposits only when pre-treated with histamine. LDL glomerular deposits were also observed after i.v. injection of day-29 sera (containing free anti-lipoprotein antibody) into day-7 infected mice, but not when a mixture of day-29 and day-7 sera was injected into normal recipient mice. LDL glomerular deposits, however, were observed when recipient mice were treated with the Plasmodium-derived Insoluble Material (PDIM) 3 days before the injection of the day-29-day-7 sera mixture or day-13 serum. Two hours after the i.v. injection of 125I-Ig-Lp, the radioactivity of the kidneys was higher in histamine-treated, PDIM-treated, and P. chabaudi-infected mice than in controls. The clearance of 125I-Ig-Lp was higher in infected and in PDIM-treated mice than in controls. We suggest that the glomerular deposit of Ig-Lp that occurs during P. chabaudi infection requires an enhancing factor such as PDIM that is released during infection.
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22
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Soulier JP, Lee H, Prou O, Raymondjean N, Dubarry M, Druilhe P. [Anti-plasmodium falciparum monoclonal antibodies. Preliminary results]. Rev Fr Transfus Immunohematol 1982; 25:373-81. [PMID: 6183726 DOI: 10.1016/s0338-4535(82)80027-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
P. falciparum grown in culture was used to immunize mice and to obtain hybridomas. Two hybrids were selected secreting high titers of monoclonal antibodies directed against the cytoplasm of erythrocytic forms of the Plasmodium and not against the membrane of normal or parasitized erythrocytes. Such antibodies are of potential value in the immuno-diagnosis of malaria.
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Dubarry M, Martin M, Moullec J. Lp (a) blood types. Comparison of immunological testing with results of polyacrylamide gel electrophoresis. Biomedicine 1975; 23:28-30. [PMID: 169924] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The results of serum beta-lipoproteins typing of 100 random human sera for Lp (a) antigen by the standard immunological method were compared with those of polyacrylamide gel electrophoresis which may detect an Lp (a) band migrating more slowly than the bulk of LDL. This band was found in all the 33 Lp (a+) but also in 9 of the 67 Lp (a-) sera examined.
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Hainaut J, Dubarry M, Boffa GA. Differentiation of antilymphocytic antibodies by analytical ion exchange chromatography: the effect of caprylic acid. Biomedicine 1974; 20:223-30. [PMID: 4433656] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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