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Cerqueira de Araujo A, Josse T, Sibut V, Urabe M, Asadullah A, Barbe V, Nakai M, Huguet E, Periquet G, Drezen JM. Chelonus inanitus bracovirus encodes lineage-specific proteins and truncated immune IκB-like factors. J Gen Virol 2022; 103. [DOI: 10.1099/jgv.0.001791] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Bracoviruses and ichnoviruses are endogenous viruses of parasitic wasps that produce particles containing virulence genes expressed in host tissues and necessary for parasitism success. In the case of bracoviruses the particles are produced by conserved genes of nudiviral origin integrated permanently in the wasp genome, whereas the virulence genes can strikingly differ depending on the wasp lineage. To date most data obtained on bracoviruses concerned species from the braconid subfamily of Microgastrinae. To gain a broader view on the diversity of virulence genes we sequenced the genome packaged in the particles of Chelonus inanitus bracovirus (CiBV) produced by a wasp belonging to a different subfamily: the Cheloninae. These are egg-larval parasitoids, which means that they oviposit into the host egg and the wasp larvae then develop within the larval stages of the host. We found that most of CiBV virulence genes belong to families that are specific to Cheloninae. As other bracoviruses and ichnoviruses however, CiBV encode v-ank genes encoding truncated versions of the immune cactus/IκB factor, which suggests these proteins might play a key role in host–parasite interactions involving domesticated endogenous viruses. We found that the structures of CiBV V-ANKs are different from those previously reported. Phylogenetic analysis supports the hypothesis that they may originate from a cactus/IκB immune gene from the wasp genome acquired by the bracovirus. However, their evolutionary history is different from that shared by other V-ANKs, whose common origin probably reflects horizontal gene transfer events of virus sequences between braconid and ichneumonid wasps.
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Affiliation(s)
| | - Thibaut Josse
- Institut de Recherche sur la Biologie de l'Insecte (IRBI), UMR 7261, CNRS - Université de Tours, Tours, France
| | - Vonick Sibut
- Institut de Recherche sur la Biologie de l'Insecte (IRBI), UMR 7261, CNRS - Université de Tours, Tours, France
| | - Mariko Urabe
- Graduate School of Agriculture, Tokyo University of Agriculture and Technology, Tokyo 183-8509, Japan
| | - Azam Asadullah
- Graduate School of Agriculture, Tokyo University of Agriculture and Technology, Tokyo 183-8509, Japan
| | - Valérie Barbe
- Génomique Métabolique, Genoscope, Institut François Jacob, CEA, CNRS, Univ Evry, Université Paris-Saclay, 91057 Evry, France
| | - Madoka Nakai
- Graduate School of Agriculture, Tokyo University of Agriculture and Technology, Tokyo 183-8509, Japan
| | - Elisabeth Huguet
- Institut de Recherche sur la Biologie de l'Insecte (IRBI), UMR 7261, CNRS - Université de Tours, Tours, France
| | - Georges Periquet
- Institut de Recherche sur la Biologie de l'Insecte (IRBI), UMR 7261, CNRS - Université de Tours, Tours, France
| | - Jean-Michel Drezen
- Institut de Recherche sur la Biologie de l'Insecte (IRBI), UMR 7261, CNRS - Université de Tours, Tours, France
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Balbinott N, Margis R. Review: Unraveling the origin of the structural and functional diversity of plant cystatins. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2022; 321:111342. [PMID: 35696902 DOI: 10.1016/j.plantsci.2022.111342] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Revised: 05/02/2022] [Accepted: 05/24/2022] [Indexed: 06/15/2023]
Abstract
The regulation of protease activity is a critical factor for the physiological balance during plant growth and development. Among the proteins involved in controlling protease activity are the cystatins, well-described inhibitors of cysteine proteases present in viruses, bacteria and most Eukaryotes. Plant cystatins, commonly called phytocystatins, display unique structural and functional diversity and are classified according to their molecular weight as type-I, -II, and -III. Their gene structure is highly conserved across Viridiplantae and provides insights into their evolutionary relationships. Many type-I phytocystatins with introns share sequence similarities with type-II phytocystatins. New data shows that they could have originated from recent losses of the carboxy-terminal extension present in type-II phytocystatins. Intronless type-I phytocystatins originated from a single event shared by flowering plants. Pieces of evidence show multiple events of gene duplications, intron losses, and gains throughout the expansion and diversity of the phytocystatin family. Gene duplication events in Gymnosperms and Eudicots resulted in inhibitors with amino acid substitutions that may modify their interaction with target proteases and other proteins. This review brings a phylogenomic analysis of plant cystatin evolution and contributes to a broader understanding of their origins. A complete functional genomic analysis among phytocystatins and their roles in plant development and responses to abiotic and biotic stresses remains a question to be fully solved.
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Affiliation(s)
- Natalia Balbinott
- Laboratório de Genomas e Populações de Plantas, Departamento de Biofísica, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, 91501-970, Porto Alegre, Brazil; Programa de Pós-graduação em Genética e Biologia Molecular, Departamento de Genética, Universidade Federal do Rio Grande do Sul, 91501-970, Porto Alegre, Brazil
| | - Rogerio Margis
- Laboratório de Genomas e Populações de Plantas, Departamento de Biofísica, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, 91501-970, Porto Alegre, Brazil; Programa de Pós-graduação em Genética e Biologia Molecular, Departamento de Genética, Universidade Federal do Rio Grande do Sul, 91501-970, Porto Alegre, Brazil; Programa de Pós-graduação em Biologia Celular e Molecular, Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul, 91501-970, Porto Alegre, Brazil; Programa INCT Plant Stress Biotech, EMBRAPA, CENARGEN, Brasilia, DF, Brazil.
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Legeai F, Santos BF, Robin S, Bretaudeau A, Dikow RB, Lemaitre C, Jouan V, Ravallec M, Drezen JM, Tagu D, Baudat F, Gyapay G, Zhou X, Liu S, Webb BA, Brady SG, Volkoff AN. Genomic architecture of endogenous ichnoviruses reveals distinct evolutionary pathways leading to virus domestication in parasitic wasps. BMC Biol 2020; 18:89. [PMID: 32703219 PMCID: PMC7379367 DOI: 10.1186/s12915-020-00822-3] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Accepted: 06/29/2020] [Indexed: 12/25/2022] Open
Abstract
BACKGROUND Polydnaviruses (PDVs) are mutualistic endogenous viruses inoculated by some lineages of parasitoid wasps into their hosts, where they facilitate successful wasp development. PDVs include the ichnoviruses and bracoviruses that originate from independent viral acquisitions in ichneumonid and braconid wasps respectively. PDV genomes are fully incorporated into the wasp genomes and consist of (1) genes involved in viral particle production, which derive from the viral ancestor and are not encapsidated, and (2) proviral segments harboring virulence genes, which are packaged into the viral particle. To help elucidating the mechanisms that have facilitated viral domestication in ichneumonid wasps, we analyzed the structure of the viral insertions by sequencing the whole genome of two ichnovirus-carrying wasp species, Hyposoter didymator and Campoletis sonorensis. RESULTS Assemblies with long scaffold sizes allowed us to unravel the organization of the endogenous ichnovirus and revealed considerable dispersion of the viral loci within the wasp genomes. Proviral segments contained species-specific sets of genes and occupied distinct genomic locations in the two ichneumonid wasps. In contrast, viral machinery genes were organized in clusters showing highly conserved gene content and order, with some loci located in collinear wasp genomic regions. This genomic architecture clearly differs from the organization of PDVs in braconid wasps, in which proviral segments are clustered and viral machinery elements are more dispersed. CONCLUSIONS The contrasting structures of the two types of ichnovirus genomic elements are consistent with their different functions: proviral segments are vehicles for virulence proteins expected to adapt according to different host defense systems, whereas the genes involved in virus particle production in the wasp are likely more stable and may reflect ancestral viral architecture. The distinct genomic architectures seen in ichnoviruses versus bracoviruses reveal different evolutionary trajectories that have led to virus domestication in the two wasp lineages.
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Affiliation(s)
- Fabrice Legeai
- IGEPP, Agrocampus Ouest, INRAE, Université de Rennes 1, 35650, Le Rheu, France
- Université Rennes 1, INRIA, CNRS, IRISA, F-35000, Rennes, France
| | - Bernardo F Santos
- Department of Entomology, National Museum of Natural History, Smithsonian Institution, 10th and Constitution Avenue NW, Washington, DC, 20560-0165, USA
| | - Stéphanie Robin
- IGEPP, Agrocampus Ouest, INRAE, Université de Rennes 1, 35650, Le Rheu, France
- Université Rennes 1, INRIA, CNRS, IRISA, F-35000, Rennes, France
| | - Anthony Bretaudeau
- IGEPP, Agrocampus Ouest, INRAE, Université de Rennes 1, 35650, Le Rheu, France
- Université Rennes 1, INRIA, CNRS, IRISA, F-35000, Rennes, France
| | - Rebecca B Dikow
- Department of Entomology, National Museum of Natural History, Smithsonian Institution, 10th and Constitution Avenue NW, Washington, DC, 20560-0165, USA
- Data Science Lab, Office of the Chief Information Officer, Smithsonian Institution, 10th and Constitution Avenue NW, Washington, DC, 20560-0165, USA
| | - Claire Lemaitre
- Université Rennes 1, INRIA, CNRS, IRISA, F-35000, Rennes, France
| | - Véronique Jouan
- DGIMI, INRAE, University of Montpellier, 34095, Montpellier, France
| | - Marc Ravallec
- DGIMI, INRAE, University of Montpellier, 34095, Montpellier, France
| | - Jean-Michel Drezen
- Institut de Recherche sur la Biologie de l'Insecte, UMR 7261, CNRS - Université de Tours, UFR des Sciences et Techniques, Parc de Grandmont, Tours, France
| | - Denis Tagu
- IGEPP, Agrocampus Ouest, INRAE, Université de Rennes 1, 35650, Le Rheu, France
| | - Frédéric Baudat
- Institut de Génétique Humaine, CNRS, University of Montpellier, 34396, Montpellier, France
| | - Gabor Gyapay
- Commissariat à l'Energie Atomique (CEA), Institut de Génomique (IG), Genoscope, 2 rue Gaston Crémieux, BP5706, 91057, Evry, France
| | - Xin Zhou
- Department of Entomology, China Agricultural University, Beijing, 100193, People's Republic of China
| | - Shanlin Liu
- Department of Entomology, China Agricultural University, Beijing, 100193, People's Republic of China
- China National GeneBank, BGI-Shenzhen, Shenzhen, Guangdong Province, 518083, People's Republic of China
| | - Bruce A Webb
- Department of Entomology, University of Kentucky, Lexington, USA
| | - Seán G Brady
- Department of Entomology, National Museum of Natural History, Smithsonian Institution, 10th and Constitution Avenue NW, Washington, DC, 20560-0165, USA
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Bredlau JP, Kuhar D, Gundersen-Rindal DE, Kester KM. The Parasitic Wasp, Cotesia congregata (Say), Consists of Two Incipient Species Isolated by Asymmetric Reproductive Incompatibility and Hybrid Inability to Overcome Host Defenses. Front Ecol Evol 2019. [DOI: 10.3389/fevo.2019.00187] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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5
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Leobold M, Bézier A, Pichon A, Herniou EA, Volkoff AN, Drezen JM. The Domestication of a Large DNA Virus by the Wasp Venturia canescens Involves Targeted Genome Reduction through Pseudogenization. Genome Biol Evol 2018; 10:1745-1764. [PMID: 29931159 PMCID: PMC6054256 DOI: 10.1093/gbe/evy127] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/18/2018] [Indexed: 12/13/2022] Open
Abstract
Polydnaviruses (PDVs) are compelling examples of viral domestication, in which wasps express a large set of genes originating from a chromosomally integrated virus to produce particles necessary for their reproductive success. Parasitoid wasps generally use PDVs as a virulence gene delivery system allowing the protection of their progeny in the body of parasitized host. However, in the wasp Venturia canescens an independent viral domestication process led to an alternative strategy as the wasp incorporates virulence proteins in viral liposomes named virus-like particles (VLPs), instead of DNA molecules. Proteomic analysis of purified VLPs and transcriptome sequencing revealed the loss of some viral functions. In particular, the genes coding for capsid components are no longer expressed, which explains why VLPs do not incorporate DNA. Here a thorough examination of V. canescens genome revealed the presence of the pseudogenes corresponding to most of the genes involved in lost functions. This strongly suggests that an accumulation of mutations that leads to gene specific pseudogenization precedes the loss of viral genes observed during virus domestication. No evidence was found for block loss of collinear genes, although extensive gene order reshuffling of the viral genome was identified from comparisons between endogenous and exogenous viruses. These results provide the first insights on the early stages of large DNA virus domestication implicating massive genome reduction through gene-specific pseudogenization, a process which differs from the large deletions described for bacterial endosymbionts.
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Affiliation(s)
- Matthieu Leobold
- Institut de Recherche sur la Biologie de l'Insecte, UMR 7261, CNRS - Université de Tours, UFR des Sciences et Techniques, Parc de Grandmont, Tours, France
| | - Annie Bézier
- Institut de Recherche sur la Biologie de l'Insecte, UMR 7261, CNRS - Université de Tours, UFR des Sciences et Techniques, Parc de Grandmont, Tours, France
| | - Apolline Pichon
- Diversity, Genomes and Interactions Microorganisms-Insect, UMR INRA 1333, Université de Montpellier 2, Montpellier, France
| | - Elisabeth A Herniou
- Institut de Recherche sur la Biologie de l'Insecte, UMR 7261, CNRS - Université de Tours, UFR des Sciences et Techniques, Parc de Grandmont, Tours, France
| | - Anne-Nathalie Volkoff
- Diversity, Genomes and Interactions Microorganisms-Insect, UMR INRA 1333, Université de Montpellier 2, Montpellier, France
| | - Jean-Michel Drezen
- Institut de Recherche sur la Biologie de l'Insecte, UMR 7261, CNRS - Université de Tours, UFR des Sciences et Techniques, Parc de Grandmont, Tours, France
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6
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Park SY, Jeong MS, Park SA, Ha SC, Na BK, Jang SB. Structural basis of the cystein protease inhibitor Clonorchis sinensis Stefin-1. Biochem Biophys Res Commun 2018; 498:9-17. [DOI: 10.1016/j.bbrc.2018.02.196] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2018] [Accepted: 02/27/2018] [Indexed: 02/03/2023]
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7
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Whitfield JB, Austin AD, Fernandez-Triana JL. Systematics, Biology, and Evolution of Microgastrine Parasitoid Wasps. ANNUAL REVIEW OF ENTOMOLOGY 2018; 63:389-406. [PMID: 29058979 DOI: 10.1146/annurev-ento-020117-043405] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The braconid parasitoid wasp subfamily Microgastrinae is perhaps the most species-rich subfamily of animals on Earth. Despite their small size, they are familiar to agriculturalists and field ecologists alike as one of the principal groups of natural enemies of caterpillars feeding on plants. Their abundance and nearly ubiquitous terrestrial distribution, their intricate interactions with host insects, and their historical association with mutualistic polydnaviruses have all contributed to Microgastrinae becoming a key group of organisms for studying parasitism, parasitoid genomics, and mating biology. However, these rich sources of data have not yet led to a robust genus-level classification of the group, and some taxonomic confusion persists as a result. We present the current status of understanding of the general biology, taxonomic history, diversity, geographical patterns, host relationships, and phylogeny of Microgastrinae as a stimulus and foundation for further study. Current progress in elucidating the biology and taxonomy of this important group is rapid and promises a revolution in the classification of these wasps in the near future.
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Affiliation(s)
- James B Whitfield
- Department of Entomology, University of Illinois, Urbana, Illinois 61801, USA;
| | - Andrew D Austin
- Australian Centre for Evolutionary Biology and Biodiversity, School of Biological Sciences, The University of Adelaide, Adelaide, South Australia 5005, Australia;
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8
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Relationship between oviposition, virulence gene expression and parasitism success in Cotesia typhae nov. sp. parasitoid strains. Genetica 2017; 145:469-479. [DOI: 10.1007/s10709-017-9987-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2017] [Accepted: 09/18/2017] [Indexed: 11/25/2022]
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Abstract
Several lineages of endoparasitoid wasps, which develop inside the body of other insects, have domesticated viruses, used as delivery tools of essential virulence factors for the successful development of their progeny. Virus domestications are major evolutionary transitions in highly diverse parasitoid wasps. Much progress has recently been made to characterize the nature of these ancestrally captured endogenous viruses that have evolved within the wasp genomes. Virus domestication from different viral families occurred at least three times in parasitoid wasps. This evolutionary convergence led to different strategies. Polydnaviruses (PDVs) are viral gene transfer agents and virus-like particles of the wasp Venturia canescens deliver proteins. Here, we take the standpoint of parasitoid wasps to review current knowledge on virus domestications by different parasitoid lineages. Then, based on genomic data from parasitoid wasps, PDVs and exogenous viruses, we discuss the different evolutionary steps required to transform viruses into vehicles for the delivery of the virulence molecules that we observe today. Finally, we discuss how endoparasitoid wasps manipulate host physiology and ensure parasitism success, to highlight the possible advantages of viral domestication as compared with other virulence strategies.
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10
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Microbial inhibitors of cysteine proteases. Med Microbiol Immunol 2016; 205:275-96. [DOI: 10.1007/s00430-016-0454-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2016] [Accepted: 03/24/2016] [Indexed: 01/06/2023]
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Abstract
Virus-host associations are usually viewed as parasitic, but several studies in recent years have reported examples of viruses that benefit host organisms. The Polydnaviridae are of particular interest because these viruses are all obligate mutualists of insects called parasitoid wasps. Parasitoids develop during their immature stages by feeding inside the body of other insects, which serve as their hosts. Polydnaviruses are vertically transmitted as proviruses through the germ line of wasps but also function as gene delivery vectors that wasps rely upon to genetically manipulate the hosts they parasitize. Here we review the evolutionary origin of polydnaviruses, the organization and function of their genomes, and some of their roles in parasitism.
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Affiliation(s)
- Michael R Strand
- Department of Entomology, University of Georgia, Athens, Georgia 30602; ,
| | - Gaelen R Burke
- Department of Entomology, University of Georgia, Athens, Georgia 30602; ,
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12
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Gasmi L, Boulain H, Gauthier J, Hua-Van A, Musset K, Jakubowska AK, Aury JM, Volkoff AN, Huguet E, Herrero S, Drezen JM. Recurrent Domestication by Lepidoptera of Genes from Their Parasites Mediated by Bracoviruses. PLoS Genet 2015; 11:e1005470. [PMID: 26379286 PMCID: PMC4574769 DOI: 10.1371/journal.pgen.1005470] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2015] [Accepted: 07/27/2015] [Indexed: 12/17/2022] Open
Abstract
Bracoviruses are symbiotic viruses associated with tens of thousands of species of parasitic wasps that develop within the body of lepidopteran hosts and that collectively parasitize caterpillars of virtually every lepidopteran species. Viral particles are produced in the wasp ovaries and injected into host larvae with the wasp eggs. Once in the host body, the viral DNA circles enclosed in the particles integrate into lepidopteran host cell DNA. Here we show that bracovirus DNA sequences have been inserted repeatedly into lepidopteran genomes, indicating this viral DNA can also enter germline cells. The original mode of Horizontal Gene Transfer (HGT) unveiled here is based on the integrative properties of an endogenous virus that has evolved as a gene transfer agent within parasitic wasp genomes for ≈100 million years. Among the bracovirus genes thus transferred, a phylogenetic analysis indicated that those encoding C-type-lectins most likely originated from the wasp gene set, showing that a bracovirus-mediated gene flux exists between the 2 insect orders Hymenoptera and Lepidoptera. Furthermore, the acquisition of bracovirus sequences that can be expressed by Lepidoptera has resulted in the domestication of several genes that could result in adaptive advantages for the host. Indeed, functional analyses suggest that two of the acquired genes could have a protective role against a common pathogen in the field, baculovirus. From these results, we hypothesize that bracovirus-mediated HGT has played an important role in the evolutionary arms race between Lepidoptera and their pathogens. Eukaryotes are generally thought to evolve mainly through the modification of existing genetic information. However, evidence of horizontal gene transfer (HGT) in eukaryotes-the accidental acquisition of a novel gene from another species, allowing acquisition of novel traits—is now recognized as an important factor in their evolution. We show here that in several lineages, lepidopteran genomes have acquired genes from a bracovirus that is symbiotically used by parasitic wasps to inhibit caterpillar host immune defences. Integration of parts of the viral genome into host caterpillar DNA strongly suggests that integration can sporadically occur in the germline, leading to the production of lepidopteran lineages that harbor bracovirus sequences. Moreover, some of the transferred bracovirus genes reported here originate from the wasp genome, demonstrating that a gene flux exists between the two insect orders Hymenoptera and Lepidoptera that diverged ≈300 MYA. As bracovirus gene organisation has evolved to allow expression in Lepidoptera, these transferred genes can be readily domesticated. Additionally, we present functional analyses suggesting that some of the acquired genes confer to caterpillars a protection toward baculovirus, a very common pathogen in the field. This phenomenon may have implications for understanding how caterpillars acquire resistance against baculoviruses used in biological control.
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Affiliation(s)
- Laila Gasmi
- Department of Genetics, Universitat de València, Burjassot, Spain
- Estructura de Recerca Interdisciplinar en Biotecnologia i Biomedicina (ERI BIOTECMED), Universitat de València, Burjassot, Spain
| | - Helene Boulain
- Institut de Recherche sur la Biologie de l'Insecte, UMR CNRS 7261, UFR des Sciences et Techniques, Université François Rabelais, Tours, France
| | - Jeremy Gauthier
- Institut de Recherche sur la Biologie de l'Insecte, UMR CNRS 7261, UFR des Sciences et Techniques, Université François Rabelais, Tours, France
| | - Aurelie Hua-Van
- Laboratoire Evolution, Génomes, Comportement, Ecologie, CNRS/Université Paris-Sud UMR9191, IRD UMR247, Université Paris-Saclay, Gif-sur-Yvette, France
| | - Karine Musset
- Institut de Recherche sur la Biologie de l'Insecte, UMR CNRS 7261, UFR des Sciences et Techniques, Université François Rabelais, Tours, France
| | - Agata K. Jakubowska
- Department of Genetics, Universitat de València, Burjassot, Spain
- Estructura de Recerca Interdisciplinar en Biotecnologia i Biomedicina (ERI BIOTECMED), Universitat de València, Burjassot, Spain
| | - Jean-Marc Aury
- Commissariat à l’Energie Atomique et aux Energies Alternatives, Genoscope (Centre National de Séquençage), Evry, France
| | - Anne-Nathalie Volkoff
- Diversity, Genomes and Interactions Between Microorganisms and Insects Laboratory, INRA (UMR 1333), Université de Montpellier, Place Eugène Bataillon, CC 101, Montpellier, France
| | - Elisabeth Huguet
- Institut de Recherche sur la Biologie de l'Insecte, UMR CNRS 7261, UFR des Sciences et Techniques, Université François Rabelais, Tours, France
| | - Salvador Herrero
- Department of Genetics, Universitat de València, Burjassot, Spain
- Estructura de Recerca Interdisciplinar en Biotecnologia i Biomedicina (ERI BIOTECMED), Universitat de València, Burjassot, Spain
- * E-mail: (SH); (JMD)
| | - Jean-Michel Drezen
- Institut de Recherche sur la Biologie de l'Insecte, UMR CNRS 7261, UFR des Sciences et Techniques, Université François Rabelais, Tours, France
- * E-mail: (SH); (JMD)
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Drezen JM, Chevignon G, Louis F, Huguet E. Origin and evolution of symbiotic viruses associated with parasitoid wasps. CURRENT OPINION IN INSECT SCIENCE 2014; 6:35-43. [PMID: 32846671 DOI: 10.1016/j.cois.2014.09.008] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2014] [Revised: 09/05/2014] [Accepted: 09/18/2014] [Indexed: 06/11/2023]
Abstract
The Polydnaviridae (PDV), including the Bracovirus (BV) and Ichnovirus (IV) genera, originated from the integration of viruses in the genomes of two parasitoid wasp lineages. In a remarkable example of convergent evolution BVs evolved from the domestication of a nudivirus, while IVs originate from a different ancestral virus belonging to a new virus entity. In both cases the ancestor genomes have been maintained in wasp genomes as endogenous viral elements involved in production of particles containing DNA encoding virulence genes that are injected into lepidopteran hosts. However many PDV virulence genes appear to be of eukaryotic origin, and expansion and diversification of these genes have led to the production of novel PDVs in different wasp species that promote survival of offspring in particular hosts.
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Affiliation(s)
- Jean-Michel Drezen
- Institut de Recherche sur la Biologie de l'Insecte, UMR CNRS 7261, Université F. Rabelais, 37200 Tours, France.
| | - Germain Chevignon
- Institut de Recherche sur la Biologie de l'Insecte, UMR CNRS 7261, Université F. Rabelais, 37200 Tours, France
| | - Faustine Louis
- Institut de Recherche sur la Biologie de l'Insecte, UMR CNRS 7261, Université F. Rabelais, 37200 Tours, France
| | - Elisabeth Huguet
- Institut de Recherche sur la Biologie de l'Insecte, UMR CNRS 7261, Université F. Rabelais, 37200 Tours, France.
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14
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Schneider SE, Thomas JH. Accidental genetic engineers: horizontal sequence transfer from parasitoid wasps to their Lepidopteran hosts. PLoS One 2014; 9:e109446. [PMID: 25296163 PMCID: PMC4190172 DOI: 10.1371/journal.pone.0109446] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2014] [Accepted: 09/04/2014] [Indexed: 11/18/2022] Open
Abstract
We show here that 105 regions in two Lepidoptera genomes appear to derive from horizontally transferred wasp DNA. We experimentally verified the presence of two of these sequences in a diverse set of silkworm (Bombyx mori) genomes. We hypothesize that these horizontal transfers are made possible by the unusual strategy many parasitoid wasps employ of injecting hosts with endosymbiotic polydnaviruses to minimize the host's defense response. Because these virus-like particles deliver wasp DNA to the cells of the host, there has been much interest in whether genetic information can be permanently transferred from the wasp to the host. Two transferred sequences code for a BEN domain, known to be associated with polydnaviruses and transcriptional regulation. These findings represent the first documented cases of horizontal transfer of genes between two organisms by a polydnavirus. This presents an interesting evolutionary paradigm in which host species can acquire new sequences from parasitoid wasps that attack them. Hymenoptera and Lepidoptera diverged ∼300 MYA, making this type of event a source of novel sequences for recipient species. Unlike many other cases of horizontal transfer between two eukaryote species, these sequence transfers can be explained without the need to invoke the sequences 'hitchhiking' on a third organism (e.g. retrovirus) capable of independent reproduction. The cellular machinery necessary for the transfer is contained entirely in the wasp genome. The work presented here is the first such discovery of what is likely to be a broader phenomenon among species affected by these wasps.
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Affiliation(s)
- Sean E. Schneider
- Department of Genome Sciences, University of Washington, Seattle, Washington, United States of America
- * E-mail:
| | - James H. Thomas
- Department of Genome Sciences, University of Washington, Seattle, Washington, United States of America
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15
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Polydnavirus-wasp associations: evolution, genome organization, and function. Curr Opin Virol 2013; 3:587-94. [DOI: 10.1016/j.coviro.2013.06.004] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2013] [Revised: 06/09/2013] [Accepted: 06/10/2013] [Indexed: 01/02/2023]
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16
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Herniou EA, Huguet E, Thézé J, Bézier A, Periquet G, Drezen JM. When parasitic wasps hijacked viruses: genomic and functional evolution of polydnaviruses. Philos Trans R Soc Lond B Biol Sci 2013; 368:20130051. [PMID: 23938758 PMCID: PMC3758193 DOI: 10.1098/rstb.2013.0051] [Citation(s) in RCA: 107] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The Polydnaviridae (PDV), including the Bracovirus (BV) and Ichnovirus genera, originated from the integration of unrelated viruses in the genomes of two parasitoid wasp lineages, in a remarkable example of convergent evolution. Functionally active PDVs represent the most compelling evolutionary success among endogenous viral elements (EVEs). BV evolved from the domestication by braconid wasps of a nudivirus 100 Ma. The nudivirus genome has become an EVE involved in BV particle production but is not encapsidated. Instead, BV genomes have co-opted virulence genes, used by the wasps to control the immunity and development of their hosts. Gene transfers and duplications have shaped BV genomes, now encoding hundreds of genes. Phylogenomic studies suggest that BVs contribute largely to wasp diversification and adaptation to their hosts. A genome evolution model explains how multidirectional wasp adaptation to different host species could have fostered PDV genome extension. Integrative studies linking ecological data on the wasp to genomic analyses should provide new insights into the adaptive role of particular BV genes. Forthcoming genomic advances should also indicate if the associations between endoparasitoid wasps and symbiotic viruses evolved because of their particularly intimate interactions with their hosts, or if similar domesticated EVEs could be uncovered in other parasites.
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Affiliation(s)
| | | | | | | | | | - Jean-Michel Drezen
- Institut de Recherche sur la Biologie de l'Insecte, CNRS UMR 7261, Université François-Rabelais, Parc de Grandmont, 37200 Tours, France
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17
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Bézier A, Louis F, Jancek S, Periquet G, Thézé J, Gyapay G, Musset K, Lesobre J, Lenoble P, Dupuy C, Gundersen-Rindal D, Herniou EA, Drezen JM. Functional endogenous viral elements in the genome of the parasitoid wasp Cotesia congregata: insights into the evolutionary dynamics of bracoviruses. Philos Trans R Soc Lond B Biol Sci 2013; 368:20130047. [PMID: 23938757 PMCID: PMC3758192 DOI: 10.1098/rstb.2013.0047] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Bracoviruses represent the most complex endogenous viral elements (EVEs) described to date. Nudiviral genes have been hosted within parasitoid wasp genomes since approximately 100 Ma. They play a crucial role in the wasp life cycle as they produce bracovirus particles, which are injected into parasitized lepidopteran hosts during wasp oviposition. Bracovirus particles encapsidate multiple dsDNA circles encoding virulence genes. Their expression in parasitized caterpillars is essential for wasp parasitism success. Here, we report on the genomic organization of the proviral segments (i.e. master sequences used to produce the encapsidated dsDNA circles) present in the Cotesia congregata parasitoid wasp genome. The provirus is composed of a macrolocus, comprising two-thirds of the proviral segments and of seven dispersed loci, each containing one to three segments. Comparative genomic analyses with closely related species gave insights into the evolutionary dynamics of bracovirus genomes. Conserved synteny in the different wasp genomes showed the orthology of the proviral macrolocus across different species. The nudiviral gene odv-e66-like1 is conserved within the macrolocus, suggesting an ancient co-localization of the nudiviral genome and bracovirus proviral segments. By contrast, the evolution of proviral segments within the macrolocus has involved a series of lineage-specific duplications.
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Affiliation(s)
- Annie Bézier
- Institut de Recherche sur la Biologie de l'Insecte, CNRS UMR 7261, Université François Rabelais, Parc de Grandmont, 37200 Tours, France
| | - Faustine Louis
- Institut de Recherche sur la Biologie de l'Insecte, CNRS UMR 7261, Université François Rabelais, Parc de Grandmont, 37200 Tours, France
| | - Séverine Jancek
- Institut de Recherche sur la Biologie de l'Insecte, CNRS UMR 7261, Université François Rabelais, Parc de Grandmont, 37200 Tours, France
| | - Georges Periquet
- Institut de Recherche sur la Biologie de l'Insecte, CNRS UMR 7261, Université François Rabelais, Parc de Grandmont, 37200 Tours, France
| | - Julien Thézé
- Institut de Recherche sur la Biologie de l'Insecte, CNRS UMR 7261, Université François Rabelais, Parc de Grandmont, 37200 Tours, France
| | - Gabor Gyapay
- Commissariat à l'Energie Atomique, Génoscope (Centre National de Séquençage), 2 rue Gaston Crémieux, CP 5706, 91057 Evry Cedex, France
| | - Karine Musset
- Institut de Recherche sur la Biologie de l'Insecte, CNRS UMR 7261, Université François Rabelais, Parc de Grandmont, 37200 Tours, France
| | - Jérome Lesobre
- Institut de Recherche sur la Biologie de l'Insecte, CNRS UMR 7261, Université François Rabelais, Parc de Grandmont, 37200 Tours, France
| | - Patricia Lenoble
- Commissariat à l'Energie Atomique, Génoscope (Centre National de Séquençage), 2 rue Gaston Crémieux, CP 5706, 91057 Evry Cedex, France
| | - Catherine Dupuy
- Institut de Recherche sur la Biologie de l'Insecte, CNRS UMR 7261, Université François Rabelais, Parc de Grandmont, 37200 Tours, France
| | - Dawn Gundersen-Rindal
- US Department of Agriculture, Agricultural Research Service, Invasive Insect Biocontrol and Behavior Laboratory, 10300 Baltimore Avenue, Building 011A BARC-WEST, Beltsville, MD 20705, USA
| | - Elisabeth A. Herniou
- Institut de Recherche sur la Biologie de l'Insecte, CNRS UMR 7261, Université François Rabelais, Parc de Grandmont, 37200 Tours, France
| | - Jean-Michel Drezen
- Institut de Recherche sur la Biologie de l'Insecte, CNRS UMR 7261, Université François Rabelais, Parc de Grandmont, 37200 Tours, France
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18
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Serbielle C, Dupas S, Perdereau E, Héricourt F, Dupuy C, Huguet E, Drezen JM. Evolutionary mechanisms driving the evolution of a large polydnavirus gene family coding for protein tyrosine phosphatases. BMC Evol Biol 2012; 12:253. [PMID: 23270369 PMCID: PMC3573978 DOI: 10.1186/1471-2148-12-253] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2012] [Accepted: 12/11/2012] [Indexed: 11/20/2022] Open
Abstract
Background Gene duplications have been proposed to be the main mechanism involved in genome evolution and in acquisition of new functions. Polydnaviruses (PDVs), symbiotic viruses associated with parasitoid wasps, are ideal model systems to study mechanisms of gene duplications given that PDV genomes consist of virulence genes organized into multigene families. In these systems the viral genome is integrated in a wasp chromosome as a provirus and virus particles containing circular double-stranded DNA are injected into the parasitoids’ hosts and are essential for parasitism success. The viral virulence factors, organized in gene families, are required collectively to induce host immune suppression and developmental arrest. The gene family which encodes protein tyrosine phosphatases (PTPs) has undergone spectacular expansion in several PDV genomes with up to 42 genes. Results Here, we present strong indications that PTP gene family expansion occurred via classical mechanisms: by duplication of large segments of the chromosomally integrated form of the virus sequences (segmental duplication), by tandem duplications within this form and by dispersed duplications. We also propose a novel duplication mechanism specific to PDVs that involves viral circle reintegration into the wasp genome. The PTP copies produced were shown to undergo conservative evolution along with episodes of adaptive evolution. In particular recently produced copies have undergone positive selection in sites most likely involved in defining substrate selectivity. Conclusion The results provide evidence about the dynamic nature of polydnavirus proviral genomes. Classical and PDV-specific duplication mechanisms have been involved in the production of new gene copies. Selection pressures associated with antagonistic interactions with parasitized hosts have shaped these genes used to manipulate lepidopteran physiology with evidence for positive selection involved in adaptation to host targets.
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Affiliation(s)
- Céline Serbielle
- Institut de Recherche sur la Biologie de l'Insecte, UMR CNRS 7261, Faculté des Sciences et Techniques, Université F. Rabelais, Parc de Grandmont, 37200, Tours, France
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19
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Burke GR, Strand MR. Polydnaviruses of Parasitic Wasps: Domestication of Viruses To Act as Gene Delivery Vectors. INSECTS 2012; 3:91-119. [PMID: 26467950 PMCID: PMC4553618 DOI: 10.3390/insects3010091] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/22/2011] [Revised: 01/07/2012] [Accepted: 01/16/2012] [Indexed: 12/21/2022]
Abstract
Symbiosis is a common phenomenon in which associated organisms can cooperate in ways that increase their ability to survive, reproduce, or utilize hostile environments. Here, we discuss polydnavirus symbionts of parasitic wasps. These viruses are novel in two ways: (1) they have become non-autonomous domesticated entities that cannot replicate outside of wasps; and (2) they function as a delivery vector of genes that ensure successful parasitism of host insects that wasps parasitize. In this review we discuss how these novelties may have arisen, which genes are potentially involved, and what the consequences have been for genome evolution.
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Affiliation(s)
- Gaelen R Burke
- Department of Entomology, The University of Georgia, 120 Cedar St., Athens, GA 30601, USA.
| | - Michael R Strand
- Department of Entomology, The University of Georgia, 120 Cedar St., Athens, GA 30601, USA.
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20
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Kordis D, Turk V. Phylogenomic analysis of the cystatin superfamily in eukaryotes and prokaryotes. BMC Evol Biol 2009; 9:266. [PMID: 19919722 PMCID: PMC2784779 DOI: 10.1186/1471-2148-9-266] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2009] [Accepted: 11/18/2009] [Indexed: 02/04/2023] Open
Abstract
BACKGROUND The cystatin superfamily comprises cysteine protease inhibitors that play key regulatory roles in protein degradation processes. Although they have been the subject of many studies, little is known about their genesis, evolution and functional diversification. Our aim has been to obtain a comprehensive insight into their origin, distribution, diversity, evolution and classification in Eukaryota, Bacteria and Archaea. RESULTS We have identified in silico the full complement of the cystatin superfamily in more than 2100 prokaryotic and eukaryotic genomes. The analysis of numerous eukaryotic genomes has provided strong evidence for the emergence of this superfamily in the ancestor of eukaryotes. The progenitor of this superfamily was most probably intracellular and lacked a signal peptide and disulfide bridges, much like the extant Giardia cystatin. A primordial gene duplication produced two ancestral eukaryotic lineages, cystatins and stefins. While stefins remain encoded by a single or a small number of genes throughout the eukaryotes, the cystatins have undergone a more complex and dynamic evolution through numerous gene and domain duplications. In the cystatin superfamily we discovered twenty vertebrate-specific and three angiosperm-specific orthologous families, indicating that functional diversification has occurred only in multicellular eukaryotes. In vertebrate orthologous families, the prevailing trends were loss of the ancestral inhibitory activity and acquisition of novel functions in innate immunity. Bacterial cystatins and stefins may be emergency inhibitors that enable survival of bacteria in the host, defending them from the host's proteolytic activity. CONCLUSION This study challenges the current view on the classification, origin and evolution of the cystatin superfamily and provides valuable insights into their functional diversification. The findings of this comprehensive study provide guides for future structural and evolutionary studies of the cystatin superfamily as well as of other protease inhibitors and proteases.
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Affiliation(s)
- Dusan Kordis
- Department of Biochemistry and Molecular and Structural Biology, J, Stefan Institute, Ljubljana, Slovenia.
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21
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Dubuffet A, Colinet D, Anselme C, Dupas S, Carton Y, Poirié M. Variation of Leptopilina boulardi success in Drosophila hosts: what is inside the black box? ADVANCES IN PARASITOLOGY 2009; 70:147-88. [PMID: 19773070 DOI: 10.1016/s0065-308x(09)70006-5] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Interactions between Drosophila hosts and parasitoid wasps are among the few examples in which occurrence of intraspecific variation of parasite success has been studied in natural populations. Such variations can originate from three categories of factors: environmental, host and parasitoid factors. Under controlled laboratory conditions, it is possible to focus on the two last categories, and, using specific reference lines, to analyze their respective importance. Parasitoid and host contributions to variations in parasite success have largely been studied in terms of evolutionary and mechanistic aspects in two Drosophila parasitoids, Asobara tabida and, in more details, in Leptopilina boulardi. This chapter focuses on the physiological and molecular aspects of L. boulardi interactions with two Drosophila host species, while most of the evolutionary hypotheses and models are presented in Chapter 11 of Dupas et al.
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Affiliation(s)
- A Dubuffet
- Institute of Integrative and Comparative Biology, Faculty of Biological Sciences, University of Leeds, United Kingdom
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22
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Serbielle C, Moreau S, Veillard F, Voldoire E, Bézier A, Mannucci MA, Volkoff AN, Drezen JM, Lalmanach G, Huguet E. Identification of parasite-responsive cysteine proteases inManduca sexta. Biol Chem 2009; 390:493-502. [DOI: 10.1515/bc.2009.061] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
AbstractParasites have evolved different virulence strategies to manipulate host physiological functions. The parasitoid waspCotesia congregatainduces developmental arrest and immune suppression of its Lepidopteran hostManduca sexta. In this interaction, a symbiotic virus (C. congregataBracovirus, CcBV) associated with the wasp is essential for parasitism success. The virus is injected into the host with wasp eggs and virus genes are expressed in host tissues. Among potential CcBV virulence genes, cystatins, which are tight binding inhibitors of C1A cysteine proteases, are suspected to play an important role in the interaction owing to their high level of expression. So far, however, potentialin vivotargets inM. sextaare unknown. Here, we characterized for the first time fourM. sextaC1A cysteine proteases corresponding to cathepsin L and cathepsin B and two different ‘26–29 kDa’ cysteine proteases (MsCath1 and MsCath2). Our analyses revealed that MsCath1 and MsCath2 are transcriptionally downregulated in the course of parasitism. Moreover, viral Cystatin1 and MsCath1 co-localize in the plasma following parasitism, strongly suggesting that they interact. We also show that parasitism induces a general increase of cysteine protease activity which is later controlled. The potential involvement of cysteine proteases in defense against parasitoids is discussed.
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Affiliation(s)
- Céline Serbielle
- Institut de Recherche sur la Biologie de l'Insecte, Université François Rabelais, UMR CNRS 6035, Faculté des Sciences et Techniques, Parc de Grandmont, F-37200 Tours, France
| | - Sébastien Moreau
- Institut de Recherche sur la Biologie de l'Insecte, Université François Rabelais, UMR CNRS 6035, Faculté des Sciences et Techniques, Parc de Grandmont, F-37200 Tours, France
| | - Florian Veillard
- INSERM U 618 ‘Protéases et Vectorisation Pulmonaires’ IFR 135 ‘Imagerie Fonctionnelle’, Université François Rabelais, Faculté de Médecine, 10 Boulevard Tonnellé, F-37032 Tours cedex, France
| | - Emilien Voldoire
- Institut de Recherche sur la Biologie de l'Insecte, Université François Rabelais, UMR CNRS 6035, Faculté des Sciences et Techniques, Parc de Grandmont, F-37200 Tours, France
| | - Annie Bézier
- Institut de Recherche sur la Biologie de l'Insecte, Université François Rabelais, UMR CNRS 6035, Faculté des Sciences et Techniques, Parc de Grandmont, F-37200 Tours, France
| | - Marie-Anne Mannucci
- Biologie Intégrative et Virologie des Insectes, UMR1231 INRA – Université Montpellier II, Place Eugène Bataillon, F-34095 Montpellier cedex, France
| | - Anne-Nathalie Volkoff
- Biologie Intégrative et Virologie des Insectes, UMR1231 INRA – Université Montpellier II, Place Eugène Bataillon, F-34095 Montpellier cedex, France
| | - Jean-Michel Drezen
- Institut de Recherche sur la Biologie de l'Insecte, Université François Rabelais, UMR CNRS 6035, Faculté des Sciences et Techniques, Parc de Grandmont, F-37200 Tours, France
| | - Gilles Lalmanach
- INSERM U 618 ‘Protéases et Vectorisation Pulmonaires’ IFR 135 ‘Imagerie Fonctionnelle’, Université François Rabelais, Faculté de Médecine, 10 Boulevard Tonnellé, F-37032 Tours cedex, France
| | - Elisabeth Huguet
- Institut de Recherche sur la Biologie de l'Insecte, Université François Rabelais, UMR CNRS 6035, Faculté des Sciences et Techniques, Parc de Grandmont, F-37200 Tours, France
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23
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Poirié M, Carton Y, Dubuffet A. Virulence strategies in parasitoid Hymenoptera as an example of adaptive diversity. C R Biol 2008; 332:311-20. [PMID: 19281961 DOI: 10.1016/j.crvi.2008.09.004] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2008] [Accepted: 09/11/2008] [Indexed: 12/01/2022]
Abstract
Parasitoids are mostly insects that develop at the expense of other arthropods, which will die as a result of the interaction. Their reproductive success thus totally depends on their ability to successfully infest their host whose reproductive success relies on its own ability to avoid or overcome parasitism. Such intense selective pressures have resulted in extremely diverse adaptations in parasitoid strategies that ensure parasitism success. For instance, wasp-specific viruses (polydnaviruses) are injected into the host by parasitoid females to modulate its physiology and immunity. This article synthesizes available physiological and molecular data on parasitoid virulence strategies and discusses the evolutionary processes at work.
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Affiliation(s)
- Marylène Poirié
- UMR "Interactions biotiques et santé végétale", Université Nice Sophia Antipolis-CNRS (UMR 6243)-INRA (UMR 1301), 400 Route des Chappes, 06903 Sophia-Antipolis, France.
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