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Dai Z, Wang H, Wu H, Zhang Q, Ji L, Wang X, Shen Q, Yang S, Ma X, Shan T, Zhang W. Parvovirus dark matter in the cloaca of wild birds. Gigascience 2022; 12:giad001. [PMID: 36734170 PMCID: PMC9896142 DOI: 10.1093/gigascience/giad001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Revised: 11/28/2022] [Accepted: 01/03/2023] [Indexed: 02/04/2023] Open
Abstract
With the development of viral metagenomics and next-generation sequencing technology, more and more novel parvoviruses have been identified in recent years, including even entirely new lineages. The Parvoviridae family includes a different group of viruses that can infect a wide variety of animals. In this study, systematic analysis was performed to identify the "dark matter" (datasets that cannot be easily attributed to known viruses) of parvoviruses and to explore their genetic diversity from wild birds' cloacal swab samples. We have tentatively defined this parvovirus "dark matter" as a highly divergent lineage in the Parvoviridae family. All parvoviruses showed several characteristics, including 2 major protein-coding genes and similar genome lengths. Moreover, we observed that the novel parvo-like viruses share similar genome organizations to most viruses in Parvoviridae but could not clustered with the established subfamilies in phylogenetic analysis. We also found some new members associated with the Bidnaviridae family, which may be derived from parvovirus. This suggests that systematic analysis of domestic and wild animal samples is necessary to explore the genetic diversity of parvoviruses and to mine for more of this potential dark matter.
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Affiliation(s)
- Ziyuan Dai
- Department of Laboratory Medicine, School of Medicine, Jiangsu University, Zhenjiang, Jiangsu 212013, China
- Department of Clinical Laboratory, The Sixth Affiliated Hospital of Nantong University, Yancheng Third People's Hospital, Yancheng, Jiangsu 224001, China
| | - Haoning Wang
- School of Geography and Tourism, Harbin University, Harbin, Heilongjiang 150076, China
| | - Haisheng Wu
- Department of Laboratory Medicine, School of Medicine, Jiangsu University, Zhenjiang, Jiangsu 212013, China
- Qinghai Institute of Endemic Disease Prevention and Control, Xining, Qinghai 810099, China
| | - Qing Zhang
- Qinghai Institute of Endemic Disease Prevention and Control, Xining, Qinghai 810099, China
| | - Likai Ji
- Department of Laboratory Medicine, School of Medicine, Jiangsu University, Zhenjiang, Jiangsu 212013, China
| | - Xiaochun Wang
- Department of Laboratory Medicine, School of Medicine, Jiangsu University, Zhenjiang, Jiangsu 212013, China
| | - Quan Shen
- Department of Laboratory Medicine, School of Medicine, Jiangsu University, Zhenjiang, Jiangsu 212013, China
| | - Shixing Yang
- Department of Laboratory Medicine, School of Medicine, Jiangsu University, Zhenjiang, Jiangsu 212013, China
| | - Xiao Ma
- Qinghai Institute of Endemic Disease Prevention and Control, Xining, Qinghai 810099, China
| | - Tongling Shan
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai 810099, China
| | - Wen Zhang
- Department of Laboratory Medicine, School of Medicine, Jiangsu University, Zhenjiang, Jiangsu 212013, China
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Characterization of the RNA Transcription Profile of Bombyx mori Bidensovirus. Viruses 2019; 11:v11040325. [PMID: 30987230 PMCID: PMC6521256 DOI: 10.3390/v11040325] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2019] [Revised: 03/29/2019] [Accepted: 03/30/2019] [Indexed: 01/15/2023] Open
Abstract
Bombyx mori bidensovirus (BmBDV) is a single-stranded DNA (ssDNA) virus from the genus Bidensovirus of the Bidnaviridae family, which, thus far, solely infects insects. It has a unique genome that contains bipartite DNA molecules (VD1 and VD2). In this study, we explored the detailed transcription mapping of the complete BmBDV genome (VD1 and VD2) by rapid amplification of cDNA ends (RACE), reverse transcription quantitative real-time PCR (RT-qPCR), and luciferase assays. For the first time, we report the transcription map of VD2. Our mapping of the transcriptional start sites reveals that the NS genes in VD1 have separate transcripts that are derived from overlapping promoters, P5 and P5.5. Thus, our study provides a strategy for alternative promoter usage in the expression of BmBDV genes.
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Gupta T, Ito K, Kadono-Okuda K, Murthy GN, Gowri EV, Ponnuvel KM. Characterization and genome comparison of an Indian isolate of bidensovirus infecting the silkworm Bombyx mori. Arch Virol 2017; 163:125-134. [PMID: 29030707 DOI: 10.1007/s00705-017-3584-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2017] [Accepted: 08/23/2017] [Indexed: 10/18/2022]
Abstract
The bipartite genome of an Indian isolate of Bombyx mori bidensovirus (BmBDV), one of the causative agents of the fatal silkworm disease 'Flacherie', was cloned and completely sequenced. Nucleotide sequence analysis of this Indian isolate of BmBDV revealed two viral DNA segments, VD1 and VD2 as well as a DNA polymerase motif which supports its taxonomical status as the type species of a new family of Bidnaviridae. The Indian isolate of BmBDV was found to have a total of six putative ORFs four of which were located on the VD1 with the other two being on the VD2 DNA segment. The VD1 DNA segment was found to code for three non-structural proteins including a viral DNA polymerase as well as one structural protein, while the VD2 DNA segment was found to code for one structural and one non-structural protein, similar to that of the Japanese and Zhenjiang isolates of BmBDV. A BmBDV ORF expression study was done through real time qPCR wherein the VD2 ORF 1 and 2 showed the maximum transcript levels. This is the first report of the genome characterization of an Indian isolate of BmBDV, infecting silkworm B. mori.
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Affiliation(s)
- Tania Gupta
- Seribiotech Research Laboratory, Carmelaram-Post, Kodathi, Bangalore, 560035, India
| | - Katsuhiko Ito
- Laboratory of Sericultural Science, Department of Science of Biological Production, Graduate School of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu, Tokyo, 183-8509, Japan
| | - Keiko Kadono-Okuda
- Division of Biotechnology, Institute of Agrobiological Sciences, National Agriculture and Food Research Organization (NARO), 1-2 Owashi, Tsukuba, 305-8634, Japan
| | - Geetha N Murthy
- Seribiotech Research Laboratory, Carmelaram-Post, Kodathi, Bangalore, 560035, India
| | - E Vijaya Gowri
- Seribiotech Research Laboratory, Carmelaram-Post, Kodathi, Bangalore, 560035, India
| | - Kangayam M Ponnuvel
- Seribiotech Research Laboratory, Carmelaram-Post, Kodathi, Bangalore, 560035, India.
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Zhang P, Miao D, Zhang Y, Wang M, Hu Z, Lü P, Yao Q. Cloning and rescue of the genome of Bombyx mori bidensovirus, and characterization of a recombinant virus. Virol J 2016; 13:126. [PMID: 27391602 PMCID: PMC4938981 DOI: 10.1186/s12985-016-0576-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2016] [Accepted: 06/28/2016] [Indexed: 01/12/2023] Open
Abstract
Background Bombyx mori bidensovirus (BmBDV), which belongs to the Bidnaviridae family established by the International Committee on Taxonomy of Viruses in 2011, was the first bidensovirus identified in insects. The structure of BmBDV is similar to that of parvoviruses, while its replication is similar to that of adenoviruses. Although BmBDV has the potential to be used as a tool in biological pest control and as an expression vector, virus rescue has been a bottleneck in the application of this virus. Methods In this study, we constructed a full-length genomic clone of BmBDV and showed that its terminal structure was restored. A recombinant BmBDV that expressed the green fluorescence protein (GFP) gene was constructed. Then, BmN cells, which are an ovarian cell line, were co-transfected with the linearized genome using continuous culture and expanded cell culture methods. Results The results showed that the GFP gene was expressed successfully, and that cell lesions occurred in virus-infected cells. Furthermore, typical densonucleosis viruses were observed in reinfected silkworm larvae and larval midgut tissues infected by BmBDV, as evidenced by the emission of green fluorescence. Conclusions Overall, these results suggest that the virus could be rescued from the infected BmN cells after co-transfection with the linear full length virus genome.
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Affiliation(s)
- Panpan Zhang
- Institute of Life Sciences, Jiangsu University, 301 Xuefu Road, Zhenjiang, 212013, China
| | - Di Miao
- Institute of Life Sciences, Jiangsu University, 301 Xuefu Road, Zhenjiang, 212013, China
| | - Yahui Zhang
- Institute of Life Sciences, Jiangsu University, 301 Xuefu Road, Zhenjiang, 212013, China
| | - Meizi Wang
- Institute of Life Sciences, Jiangsu University, 301 Xuefu Road, Zhenjiang, 212013, China
| | - Zhaoyang Hu
- Institute of Life Sciences, Jiangsu University, 301 Xuefu Road, Zhenjiang, 212013, China
| | - Peng Lü
- Institute of Life Sciences, Jiangsu University, 301 Xuefu Road, Zhenjiang, 212013, China
| | - Qin Yao
- Institute of Life Sciences, Jiangsu University, 301 Xuefu Road, Zhenjiang, 212013, China.
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Determination of the proteins encoded by BmBDV VD1-ORF4 and their interacting proteins in BmBDV-infected midguts. Curr Microbiol 2015; 70:623-9. [PMID: 25561406 DOI: 10.1007/s00284-014-0765-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2014] [Accepted: 11/14/2014] [Indexed: 12/23/2022]
Abstract
Bombyx mori bidensovirus (BmBDV) VD1-ORF4 consists of 3,318 nucleotides, which codes for a predicted protein with molecular weight of about 127 kDa. However, the authentic proteins encoded by VD1-ORF4 in silkworm midguts infected with BmBDV and their interacting proteins are still unclear. In this study, Western blot analysis revealed that a 127-kDa protein was confirmed to be translated from the VD1-ORF4 transcript using polyclonal antibodies and monoclonal antibodies against VD1-ORF4 deduced amino acid. Moreover, four smaller proteins with molecular weight of about 70, 60, 53, and 42 kDa were also examined in the infected midguts. Transient expression assay indicated that the expression amount of VD1-ORF4 fused with egfp was at least 30-fold lower than that of egfp gene, and immunofluorescence staining result indicated that these proteins encoded by VD1-ORF4 were located in both the cytoplasm and nucleus. Co-immunoprecipitation result showed that Aminopeptidase and Heat shock protein 90 can be captured by these proteins encoded by VD1-ORF4. In conclusion, multiple proteins were produced from the transcripts of VD1-ORF4 gene by an uncertain expression strategy, which may play important roles in viral replication and assembly.
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Networks of evolutionary interactions underlying the polyphyletic origin of ssDNA viruses. Curr Opin Virol 2013; 3:578-86. [PMID: 23850154 DOI: 10.1016/j.coviro.2013.06.010] [Citation(s) in RCA: 86] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2013] [Revised: 06/13/2013] [Accepted: 06/17/2013] [Indexed: 11/22/2022]
Abstract
Viruses with single-stranded (ss) DNA genomes infect hosts from all three domains of life and are present in all imaginable environments. Many new ssDNA viruses have been recently isolated, including those infecting algae, fungi, insects and even archaea. In parallel, culture-independent metagenomic approaches have illuminated the tremendous genetic diversity of these viruses, yielding valuable insights into their evolution. Here, I integrate this knowledge to propose a scenario in which certain groups of ssDNA viruses (including Geminiviridae, Circoviridae, Parvoviridae and Microviridae) have originated from plasmids via acquisition of jelly-roll capsid protein genes from ssRNA viruses. This scenario places structurally related viruses with DNA and RNA genomes into an evolutionary continuum and highlights general evolutionary trends in the virosphere.
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Li G, Hu Z, Guo X, Li G, Tang Q, Wang P, Chen K, Yao Q. Identification of Bombyx mori bidensovirus VD1-ORF4 reveals a novel protein associated with viral structural component. Curr Microbiol 2013; 66:527-34. [PMID: 23328902 DOI: 10.1007/s00284-013-0306-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2012] [Accepted: 01/02/2013] [Indexed: 01/27/2023]
Abstract
Bombyx mori bidensovirus (BmBDV) VD1-ORF4 (open reading frame 4, ORF4) consists of 3,318 nucleotides, which codes for a predicted 1,105-amino acid protein containing a conserved DNA polymerase motif. However, its functions in viral propagation remain unknown. In the current study, the transcription of VD1-ORF4 was examined from 6 to 96 h postinfection (p.i.) by RT-PCR, 5'-RACE revealed the transcription initiation site of BmBDV ORF4 to be -16 nucleotides upstream from the start codon, and 3'-RACE revealed the transcription termination site of VD1-ORF4 to be +7 nucleotides downstream from termination codon. Three different proteins were examined in the extracts of BmBDV-infected silkworms midguts by Western blot using raised antibodies against VD1-ORF4 deduced amino acid, and a specific protein band about 53 kDa was further detected in purified virions using the same antibodies. Taken together, BmBDV VD1-ORF4 codes for three or more proteins during the viral life cycle, one of which is a 53 kDa protein and confirmed to be a component of BmBDV virion.
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Affiliation(s)
- Guohui Li
- Institute of Life Sciences, Jiangsu University, 301# Xuefu Road, Zhenjiang 212013, China.
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Characterization of the promoter elements of Bombyx mori bidensovirus nonstructural gene 1. Curr Microbiol 2012; 65:643-8. [PMID: 22898833 DOI: 10.1007/s00284-012-0199-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2011] [Accepted: 06/29/2012] [Indexed: 10/28/2022]
Abstract
Bombyx mori Bidensovirus (BmBDV), a bipartite virus possesses two single-stranded linear DNAs (VD1 and VD2) and shows high pathogenic ability to Bombyx mori. Previous research found that the genes of nonstructural protein ns1 and ns2 were in the same transcript. To investigate the mechanism of transcriptional regulation of ns1 and ns2 genes, the 5'-flanking sequence (289 nt) of ns1 gene, encompasses the regions of the common terminal sequence (CTS) and the predicted P5 promoter from the 5'-terminus of the viral genome to the transcription initiation site of the ns1 gene was cloned and fused to the upstream of the luciferase reporter gene. The luciferase reporter assay showed that the 53 nt CTS of VD1 and VD2 can downregulate the activity of P5 by 13.3 %. The comparison in different cell lines showed that P5 possessed high promoter activity in BmN and Hi5 cell lines. Interestingly, P5 also had high activity in Hela cells, a kind of cancer cell of human. Subsequent truncated promoter analysis showed that the 31 nt (-236 to -206 nt) sequence is very important to P5 for the activity down to 36.5 % after deletion of it. While the activity also remained 26.5 % after the deletion of the TATA box, suggesting that the promoter is TATA independent. Moreover, in order to further understand the activity intensity of P5, a comparison with other three promoters, B. mori actin3 (Bm-actin3), B. mori nuclear polyhedrosis virus (BmNPV) immediate early 1 gene promoter (BmNPV-ie-1), and a synthetic promoter (3xP3) was carried out, the result indicated that the activity of P5 was weaker than that of anyone of them.
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Expression analysis of Bombyx mori parvo-like virus VD2-ORF1 gene encoding a minor structural protein. Biologia (Bratisl) 2011. [DOI: 10.2478/s11756-011-0074-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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The non-structural protein NS-2 of Bombyx mori parvo-like virus is localized to the nuclear membrane. Curr Microbiol 2011; 63:8-15. [PMID: 21479931 DOI: 10.1007/s00284-011-9933-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2011] [Accepted: 03/30/2011] [Indexed: 01/13/2023]
Abstract
Bombyx mori parvo-like virus (BmPLV) has two complementary single-stranded DNA genome (VD1 and VD2) and owns a self-encoding DNA polymerase motif, but its replication mechanism is unclear. In our previous research, a protein encoded by VD1-ORF1 was indentified in the midgut of BmPLV China Zhenjiang isolate-(BmPLV-Z) infected silkworm larvae via two-dimensional gel electrophoresis (2-DE). This protein was named as non-structural protein 2 (NS2), which showed no similarity to that of parvoviruses. To date, little is known about it. In this study, sequence alignment results showed that NS2 shared homology with some chromosomal replication initiator protein dnaA and DNA-binding response regulators. The ns2 was cloned and expressed in E. coli, and then a polyclonal antibody of the NS2 protein was prepared successfully. The data from real-time quantitative PCR displayed that the transcription of VD1-ORF1 from BmPLV-Z-infected midguts started from 28-h post inoculation (h p.i.) in low amounts, but in high amounts at late stages of infection. Immunofluorescence showed that NS2 ultimately concentrated on the nuclear membrane in BmN cells at late stages, indicating that NS2 might be associated with integral membrane protein.
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