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Ascovirus P64 Homologs: A Novel Family of Large Cationic Proteins That Condense Viral Genomic DNA for Encapsidation. BIOLOGY 2018; 7:biology7030044. [PMID: 30208603 PMCID: PMC6163548 DOI: 10.3390/biology7030044] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/09/2018] [Revised: 09/01/2018] [Accepted: 09/07/2018] [Indexed: 01/05/2023]
Abstract
Eukaryotic dsDNA viruses use small basic protamine-like proteins or histones, typically <15 kDa, to condense and encapsidate their genomic (g)DNAs during virogenesis. Ascoviruses are large dsDNA (~100⁻200 kbp) viruses that are pathogenic to lepidopteran larvae. Little is known about the molecular basis for condensation and encapsidation of their gDNAs. Previous proteomic analysis showed that Spodoptera frugiperda ascovirus (SfAV-1a) virions contain a large unique DNA-binding protein (P64; 64 kDa, pI = 12.2) with a novel architecture proposed to condense its gDNA. Here we used physical, biochemical, and transmission electron microscopy techniques to demonstrate that P64's basic C-terminal domain condenses SfAV-1a gDNA. Moreover, we demonstrate that only P64 homologs in other ascovirus virions are unique in stably binding DNA. As similar protein families or subfamilies were not identified in extensive database searches, our collective data suggest that ascovirus P64 homologs comprise a novel family of atypical large viral gDNA condensing proteins.
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2
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Invertebrate Iridoviruses: A Glance over the Last Decade. Viruses 2018; 10:v10040161. [PMID: 29601483 PMCID: PMC5923455 DOI: 10.3390/v10040161] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2017] [Revised: 02/21/2018] [Accepted: 02/23/2018] [Indexed: 02/06/2023] Open
Abstract
Members of the family Iridoviridae (iridovirids) are large dsDNA viruses that infect both invertebrate and vertebrate ectotherms and whose symptoms range in severity from minor reductions in host fitness to systemic disease and large-scale mortality. Several characteristics have been useful for classifying iridoviruses; however, novel strains are continuously being discovered and, in many cases, reliable classification has been challenging. Further impeding classification, invertebrate iridoviruses (IIVs) can occasionally infect vertebrates; thus, host range is often not a useful criterion for classification. In this review, we discuss the current classification of iridovirids, focusing on genomic and structural features that distinguish vertebrate and invertebrate iridovirids and viral factors linked to host interactions in IIV6 (Invertebrate iridescent virus 6). In addition, we show for the first time how complete genome sequences of viral isolates can be leveraged to improve classification of new iridovirid isolates and resolve ambiguous relations. Improved classification of the iridoviruses may facilitate the identification of genus-specific virulence factors linked with diverse host phenotypes and host interactions.
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Qiu L, Chen MM, Wang RY, Wan XY, Li C, Zhang QL, Dong X, Yang B, Xiang JH, Huang J. Complete genome sequence of shrimp hemocyte iridescent virus (SHIV) isolated from white leg shrimp, Litopenaeus vannamei. Arch Virol 2018; 163:781-785. [PMID: 29181623 PMCID: PMC5814465 DOI: 10.1007/s00705-017-3642-4] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2017] [Accepted: 11/02/2017] [Indexed: 12/13/2022]
Abstract
Infection with shrimp hemocyte iridescent virus (SHIV), a new virus of the family Iridoviridae isolated in China, results in a high mortality rate in white leg shrimp (Litopenaeus vannamei). The complete genome sequence of SHIV was determined and analyzed in this study. The genomic DNA was 165,809 bp long with 34.6% G+C content and 170 open reading frames (ORFs). Dotplot analysis showed that the longest repetitive region was 320 bp in length, including 11 repetitions of an 18-bp sequence and 3.1 repetitions of a 39-bp sequence. Two phylogenetic trees were constructed based on 27 or 16 concatenated sequences of proteins encoded by genes that are conserved between SHIV homologous and other iridescent viruses. The results of this study, suggest that SHIV should be considered a member of the proposed new genus "Xiairidovirus".
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Affiliation(s)
- Liang Qiu
- Qingdao Key Laboratory of Mariculture Epidemiology and Biosecurity, Key Laboratory of Maricultural Organism Disease Control, Ministry of Agriculture, Function Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, 266071, China
- Shanghai Ocean University, Shanghai, 201306, China
| | - Meng-Meng Chen
- Qingdao Key Laboratory of Mariculture Epidemiology and Biosecurity, Key Laboratory of Maricultural Organism Disease Control, Ministry of Agriculture, Function Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, 266071, China
- Shanghai Ocean University, Shanghai, 201306, China
| | - Ruo-Yu Wang
- Qingdao Key Laboratory of Mariculture Epidemiology and Biosecurity, Key Laboratory of Maricultural Organism Disease Control, Ministry of Agriculture, Function Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, 266071, China
- Dalian Ocean University, Dalian, 116023, China
| | - Xiao-Yuan Wan
- Qingdao Key Laboratory of Mariculture Epidemiology and Biosecurity, Key Laboratory of Maricultural Organism Disease Control, Ministry of Agriculture, Function Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, 266071, China
| | - Chen Li
- Qingdao Key Laboratory of Mariculture Epidemiology and Biosecurity, Key Laboratory of Maricultural Organism Disease Control, Ministry of Agriculture, Function Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, 266071, China
| | - Qing-Li Zhang
- Qingdao Key Laboratory of Mariculture Epidemiology and Biosecurity, Key Laboratory of Maricultural Organism Disease Control, Ministry of Agriculture, Function Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, 266071, China
- Shanghai Ocean University, Shanghai, 201306, China
| | - Xuan Dong
- Qingdao Key Laboratory of Mariculture Epidemiology and Biosecurity, Key Laboratory of Maricultural Organism Disease Control, Ministry of Agriculture, Function Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, 266071, China
| | - Bing Yang
- Qingdao Key Laboratory of Mariculture Epidemiology and Biosecurity, Key Laboratory of Maricultural Organism Disease Control, Ministry of Agriculture, Function Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, 266071, China
| | - Jian-Hai Xiang
- Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China
| | - Jie Huang
- Qingdao Key Laboratory of Mariculture Epidemiology and Biosecurity, Key Laboratory of Maricultural Organism Disease Control, Ministry of Agriculture, Function Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, 266071, China.
- Shanghai Ocean University, Shanghai, 201306, China.
- Dalian Ocean University, Dalian, 116023, China.
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4
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Li F, Xu L, Yang F. Genomic characterization of a novel iridovirus from redclaw crayfish Cherax quadricarinatus: evidence for a new genus within the family Iridoviridae. J Gen Virol 2017; 98:2589-2595. [DOI: 10.1099/jgv.0.000904] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Affiliation(s)
- Fang Li
- State Key Laboratory Breeding Base of Marine Genetic Resources; Fujian Key Laboratory of Marine Genetic Resources; Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources; Key Laboratory of Marine Genetic Resources of State Oceanic Administration, Third Institute of Oceanography, SOA, Xiamen 361005, PR China
| | - Limei Xu
- State Key Laboratory Breeding Base of Marine Genetic Resources; Fujian Key Laboratory of Marine Genetic Resources; Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources; Key Laboratory of Marine Genetic Resources of State Oceanic Administration, Third Institute of Oceanography, SOA, Xiamen 361005, PR China
| | - Feng Yang
- State Key Laboratory Breeding Base of Marine Genetic Resources; Fujian Key Laboratory of Marine Genetic Resources; Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources; Key Laboratory of Marine Genetic Resources of State Oceanic Administration, Third Institute of Oceanography, SOA, Xiamen 361005, PR China
- Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao, PR China
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5
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Dizman YA, Muratoglu H, Sandalli C, Nalcacioglu R, Demirbag Z. Chilo iridescent virus (CIV) ORF 012L encodes a protein with both exonuclease and endonuclease functions. Arch Virol 2016; 161:3029-37. [PMID: 27496102 DOI: 10.1007/s00705-016-3007-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2016] [Accepted: 08/01/2016] [Indexed: 10/21/2022]
Abstract
Chilo iridescent virus (CIV) is the type member of the genus Iridovirus within the family Iridoviridae. The virions of CIV contain a single linear dsDNA molecule that is circularly permuted and terminally redundant. The genome of CIV contains an open reading frame (ORF 012L) encoding a protein homologous to exonuclease II of Schizosaccharomyces pombe. In this study, we focused on the characterization of CIV ORF 012L. The target ORF was cloned into the pET28a vector, expressed in E. coli strain BL21 (DE3) pLysS with an N-terminal His tag and purified to homogeneity by using Ni-NTA affinity chromatography. Biochemical characterization of the purified CIV 012L confirmed that this viral protein is a functional 5'-3' exonuclease that digests 3'-biotin-labelled oligonucleotides and linear double-stranded DNA (dsDNA) molecules from their 5' termini in a highly processive manner. CIV 012L also has a potent endonuclease activity on dsDNA in vitro. In addition, CIV 012L converted supercoiled plasmid DNA (replicative form I, RFI) into the open circular form (RFII) and then open circular form into linear form (RFIII). Endonuclease activity of CIV 012L was optimal in the presence of 10 mM Mg(2+) or 30 mM Mn(2+) ions and at 150 mM NaCl or KCl salt concentrations. The highest endonuclease activity was obtained at pH 8, and it reached a maximum at 55 °C. The CIV 012L protein showed deficiencies for both double- and single-stranded RNAs.
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Affiliation(s)
- Yesim Akturk Dizman
- Department of Biology, Faculty of Sciences, Karadeniz Technical University, 61080, Trabzon, Turkey.,Department of Biology, Faculty of Arts and Sciences, Recep Tayyip Erdoğan University, 53100, Rize, Turkey
| | - Hacer Muratoglu
- Department of Molecular Biology and Genetic, Faculty of Sciences, Karadeniz Technical University, 61080, Trabzon, Turkey
| | - Cemal Sandalli
- Department of Biology, Faculty of Arts and Sciences, Recep Tayyip Erdoğan University, 53100, Rize, Turkey
| | - Remziye Nalcacioglu
- Department of Biology, Faculty of Sciences, Karadeniz Technical University, 61080, Trabzon, Turkey.
| | - Zihni Demirbag
- Department of Biology, Faculty of Sciences, Karadeniz Technical University, 61080, Trabzon, Turkey
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Xu L, Wang T, Li F, Yang F. Isolation and preliminary characterization of a new pathogenic iridovirus from redclaw crayfish Cherax quadricarinatus. DISEASES OF AQUATIC ORGANISMS 2016; 120:17-26. [PMID: 27304867 DOI: 10.3354/dao03007] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We report the preliminary characterization of a new iridovirus detected in diseased Cherax quadricarinatus collected from a farm in Fujian, China. Transmission electron microscopy identified numerous icosahedral particles (~150 nm in diameter) in the cytoplasm and budding from the plasma membrane of hematopoietic tissue cells. SDS-PAGE of virions semi-purified from the hemolymph of moribund C. quadricarinatus identified 24 proteins including a 50 kDa major capsid protein (MCP). By summing the sizes of DNA restriction endonuclease fragments, the viral genome was estimated to be ~150 kb in length. A 34 amino acid sequence deduced from a 103 bp MCP gene region amplified by PCR using degenerate primers targeted to MCP gene regions conserved among iridoviruses and chloriridoviruses was most similar (55% identity) to Sergestid iridovirus. Based on virion morphology, protein composition, DNA genome length, and MCP sequence relatedness, the virus identified has tentatively been named Cherax quadricarinatus iridovirus (CQIV). In addition, experimental infection of healthy C. quadricarinatus, Procambarus clarkii, and Litopenaeus vannamei with CQIV caused the same disease and high mortality, suggesting that CQIV poses a potential threat to cultured and wild crayfish and shrimp.
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Affiliation(s)
- Limei Xu
- Key Laboratory of Marine Genetic Resources, Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources, Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, PR China
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Huang Y, Li S, Zhao Q, Pei G, An X, Guo X, Zhou H, Zhang Z, Zhang J, Tong Y. Isolation and characterization of a novel invertebrate iridovirus from adult Anopheles minimus (AMIV) in China. J Invertebr Pathol 2015; 127:1-5. [PMID: 25637833 DOI: 10.1016/j.jip.2015.01.007] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2014] [Revised: 01/20/2015] [Accepted: 01/21/2015] [Indexed: 12/01/2022]
Abstract
An invertebrate iridovirus (designated AMIV) was isolated from adult wild-captured Anopheles minimus mosquitoes in China. AMIV was pathologically and morphologically characterized and sequenced using the Ion Torrent™ sequencing platform. Phylogenetic analysis based on both the major capsid protein and core genes revealed that AMIV differs from all the members of the family Iridoviridae. The AMIV negatively strained virion has a diameter of about 130nm. AMIV contains a linear DNA molecule of 163,023bp, with 39% G+C content and 148 coding sequences. The genome analysis revealed that AMIV genome encodes a high content of replication associated genes including BRO-like genes. This is the ninth complete genome of IIV reported.
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Affiliation(s)
- Yong Huang
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, 20 Dong-Da Street, Fengtai District, Beijing 100071, China
| | - Shasha Li
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, 20 Dong-Da Street, Fengtai District, Beijing 100071, China
| | - Qiumin Zhao
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, 20 Dong-Da Street, Fengtai District, Beijing 100071, China
| | - Guangqian Pei
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, 20 Dong-Da Street, Fengtai District, Beijing 100071, China
| | - Xiaoping An
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, 20 Dong-Da Street, Fengtai District, Beijing 100071, China
| | - Xiaofang Guo
- Yunnan Institute of Parasitic Diseases, Pu'er, Yunnan, China
| | - Hongning Zhou
- Yunnan Institute of Parasitic Diseases, Pu'er, Yunnan, China
| | - Zhiyi Zhang
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, 20 Dong-Da Street, Fengtai District, Beijing 100071, China
| | - Jiusong Zhang
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, 20 Dong-Da Street, Fengtai District, Beijing 100071, China.
| | - Yigang Tong
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, 20 Dong-Da Street, Fengtai District, Beijing 100071, China.
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8
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Piégu B, Asgari S, Bideshi D, Federici BA, Bigot Y. Evolutionary relationships of iridoviruses and divergence of ascoviruses from invertebrate iridoviruses in the superfamily Megavirales. Mol Phylogenet Evol 2015; 84:44-52. [PMID: 25562178 DOI: 10.1016/j.ympev.2014.12.013] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2014] [Revised: 10/09/2014] [Accepted: 12/19/2014] [Indexed: 12/29/2022]
Abstract
The family Iridoviridae of the superfamily Megavirales currently consists of five genera. Three of these, Lymphocystivirus, Megalocytivirus and Ranavirus, are composed of species that infect vertebrates, and the other two, Chloriridovirus and Iridovirus, contain species that infect invertebrates. Until recently, the lack of genomic sequence data limited investigation of the evolutionary relationships between the invertebrate iridoviruses (IIVs) and vertebrate iridoviruses (VIVs), as well as the relationship of these viruses to those of the closely related family Ascoviridae, which only contains species that infect insects. To help clarify the phylogenetic relationships of these viruses, we recently published the annotated genome sequences of five additional IIV isolates. Here, using classical approaches of phylogeny via maximum likelihood, a Bayesian approach, and resolution of a core protein tree, we demonstrate that the invertebrate and vertebrate IV species constitute two lineages that diverged early during the evolution of the family Iridoviridae, before the emergence of the four IIV clades, previously referred to as Chloriridoviruses, Polyiridoviruses, Oligoiridoviruses and Crustaceoiridoviruses. In addition, we provide evidence that species of the family Ascoviridae have a more recent origin than most iridoviruses, emerging just before the differentiation between the Oligoiridoviruses and Crustaceoiridovirus clades. Our results also suggest that after emergence, based on their molecular clock, the ascoviruses evolved more quickly than their closest iridovirus relatives.
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Affiliation(s)
- Benoît Piégu
- UMR INRA-CNRS 7247, PRC, Centre INRA de Nouzilly, 37380 Nouzilly, France
| | - Sassan Asgari
- UMR INRA-CNRS 7247, PRC, Centre INRA de Nouzilly, 37380 Nouzilly, France; School of Biological Sciences, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Dennis Bideshi
- California Baptist University, Department of Natural and Mathematical Sciences, 8432 Magnolia Avenue, Riverside, CA 92504, USA; Department of Entomology and Developmental Biology, University of California, Riverside, CA 92521, USA
| | - Brian A Federici
- Department of Entomology and Developmental Biology, University of California, Riverside, CA 92521, USA; Interdepartmental Graduate Programs in Microbiology and Cell, Molecular and Developmental Biology, University of California, Riverside, CA 92521, USA
| | - Yves Bigot
- UMR INRA-CNRS 7247, PRC, Centre INRA de Nouzilly, 37380 Nouzilly, France.
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9
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Ozgen A, Muratoglu H, Demirbag Z, Vlak JM, van Oers MM, Nalcacioglu R. Construction and characterization of a recombinant invertebrate iridovirus. Virus Res 2014; 189:286-92. [PMID: 24930447 DOI: 10.1016/j.virusres.2014.05.012] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2014] [Revised: 05/09/2014] [Accepted: 05/13/2014] [Indexed: 01/04/2023]
Abstract
Chilo iridescent virus (CIV), officially named Insect iridescent virus 6 (IIV6), is the type species of the genus Iridovirus (family Iridoviridae). In this paper we constructed a recombinant CIV, encoding the green fluorescent protein (GFP). This recombinant can be used to investigate viral replication dynamics. We showed that homologous recombination is a valid method to make CIV gene knockouts and to insert foreign genes. The CIV 157L gene, putatively encoding a non-functional inhibitor of apoptosis (IAP), was chosen as target for foreign gene insertion. The gfp open reading frame preceded by the viral mcp promoter was inserted into the 157L locus by homologous recombination in Anthonomus grandis BRL-AG-3A cells. Recombinant virus (rCIV-Δ157L-gfp) was purified by successive rounds of plaque purification. All plaques produced by the purified recombinant virus emitted green fluorescence due to the presence of GFP. One-step growth curves for recombinant and wild-type CIV were similar and the recombinant was fully infectious in vivo. Hence, CIV157L can be inactivated without altering the replication kinetics of the virus. Consequently, the CIV 157L locus can be used as a site for insertion of foreign DNA, e.g. to modify viral properties for insect biocontrol.
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Affiliation(s)
- Arzu Ozgen
- Karadeniz Technical University, Faculty of Science, Department of Biology, 61080 Trabzon, Turkey
| | - Hacer Muratoglu
- Karadeniz Technical University, Faculty of Science, Department of Molecular Biology and Genetics, 61080 Trabzon, Turkey
| | - Zihni Demirbag
- Karadeniz Technical University, Faculty of Science, Department of Biology, 61080 Trabzon, Turkey
| | - Just M Vlak
- Laboratory of Virology, Wageningen University, Droevendaalsesteeg 1, 6708 PB Wageningen, The Netherlands
| | - Monique M van Oers
- Laboratory of Virology, Wageningen University, Droevendaalsesteeg 1, 6708 PB Wageningen, The Netherlands
| | - Remziye Nalcacioglu
- Karadeniz Technical University, Faculty of Science, Department of Biology, 61080 Trabzon, Turkey.
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10
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Piégu B, Guizard S, Yeping T, Cruaud C, Couloux A, Bideshi DK, Federici BA, Bigot Y. Complete genome sequence of invertebrate iridovirus IIV22A, a variant of IIV22, isolated originally from a blackfly larva. Stand Genomic Sci 2014; 9:940-7. [PMID: 25197475 PMCID: PMC4149023 DOI: 10.4056/sigs.5059132] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Members of the family Iridoviridae are animal viruses that infect only invertebrates and poikilothermic vertebrates. The invertebrate iridoviruses 22 (IIV22) and 25 (IIV25) were originally isolated from a single sample of blackfly larva (Simulium spp., order Diptera) collected from the Ystwyth river near Aberystwyth, Wales. Recently, the genomes of IIV22 (197.7 kbp) and IIV25 (204.8 kbp) were sequenced and reported. Here, we describe the complete genome sequence of IIV22A, a variant that was isolated from the same pool of virions collected from the blackfly larva from which the IIV22 virion genome originated. The IIV22A genome, 196.5 kbp, is smaller than IIV22. Nevertheless, it contains 7 supplementary putative ORFs. Its analysis enables evaluation of the degree of genomic polymorphisms within an IIV isolate. Despite the occurrence of this IIV variant with IIV22 and IIV25 in a single blackfly larva and the features of their DNA polymerase, we found no evidence of lateral genetic transfers between the genomes of these two IIV species.
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Affiliation(s)
- Benoît Piégu
- UMR INRA-CNRS 7247, PRC, Centre INRA de Nouzilly, Nouzilly, France
| | | | | | | | | | | | | | - Yves Bigot
- UMR INRA-CNRS 7247, PRC, Centre INRA de Nouzilly, Nouzilly, France
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11
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Piégu B, Guizard S, Yeping T, Cruaud C, Asgari S, Bideshi DK, Federici BA, Bigot Y. Genome sequence of a crustacean iridovirus, IIV31, isolated from the pill bug, Armadillidium vulgare. J Gen Virol 2014; 95:1585-1590. [PMID: 24722681 DOI: 10.1099/vir.0.066076-0] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
Members of the family Iridoviridae are animal viruses that infect only invertebrates and poikilothermic vertebrates. The invertebrate iridovirus 31 (IIV31) was originally isolated from adult pill bugs, Armadillidium vulgare (class Crustacea, order Isopoda, suborder Oniscidea), found in southern California on the campus of the University of California, Riverside, USA. IIV31 virions are icosahedral, have a diameter of about 135 nm, and contain a dsDNA genome 220.222 kbp in length, with 35.09 mol % G+C content and 203 ORFs. Here, we describe the complete genome sequence of this virus and its annotation. This is the eighth genome sequence of an IIV reported.
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Affiliation(s)
- Benoît Piégu
- UMR INRA-CNRS 7247, PRC, Centre INRA Val de Loire, 37380 Nouzilly, France
| | - Sébastien Guizard
- UMR INRA-CNRS 7247, PRC, Centre INRA Val de Loire, 37380 Nouzilly, France
| | - Tan Yeping
- Interdepartmental Graduate Programs in Cell, Molecular and Developmental Biology, University of California, Riverside, CA 92521, USA.,Department of Entomology, Molecular and Developmental Biology, University of California, Riverside, CA 92521, USA
| | - Corinne Cruaud
- CEA/Institut de Génomique GENOSCOPE, 2 Rue Gaston Crémieux, CP 5706, 91057 Evry CEDEX, France
| | - Sassan Asgari
- School of Biological Sciences, University of Queensland, St Lucia, QLD 4072, Australia
| | - Dennis K Bideshi
- California Baptist University, Department of Natural and Mathematical Sciences, 8432 Magnolia Avenue, Riverside, CA 92504, USA.,Department of Entomology, Molecular and Developmental Biology, University of California, Riverside, CA 92521, USA
| | - Brian A Federici
- Interdepartmental Graduate Programs in Cell, Molecular and Developmental Biology, University of California, Riverside, CA 92521, USA.,Department of Entomology, Molecular and Developmental Biology, University of California, Riverside, CA 92521, USA
| | - Yves Bigot
- UMR INRA-CNRS 7247, PRC, Centre INRA Val de Loire, 37380 Nouzilly, France
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