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Cristofer Sitinjak M, Chen JK, Lee MY, Liu HJ, Wang CY. Characterization of a novel reporter system for beak and feather disease virus. Gene 2023; 867:147371. [PMID: 36933814 DOI: 10.1016/j.gene.2023.147371] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Revised: 02/08/2023] [Accepted: 03/13/2023] [Indexed: 03/18/2023]
Abstract
Beak and feather disease virus (BFDV) belongs to the Circoviridae family, which has a relatively simple replication mechanism. As BFDV lacks a mature cell culture system, a novel mini-replicon system based on the reporter plasmid that contains the origin of replication, which can bind to the Rep protein expressed from another plasmid and thus trigger its replication and induce/increase luminescence was developed. The dual-luciferase assay was used in this system to measure replicative efficiency by comparing relative light units (RLU) of firefly luciferase. Linear relationships between the luciferase activity of the reporter plasmids with the BFDV origin of replication and the amounts of the Rep protein and vice versa were found, suggesting the mini-replicon system can be used to quantify viral replication. Moreover, the activities of reporter plasmids driven by mutated Rep proteins or the activities of reporter plasmids with mutations were significantly downregulated. The Rep and Cap promoter activities can be characterized using this luciferase reporter system. Notably, the RLU of the reporter plasmid was considerably inhibited in the presence of sodium orthovanadate (Na3VO4). When BFDV-infected birds were treated with Na3VO4, the viral loads of BFDV rapidly decreased. In conclusion, this mini-replicon reporter gene-based system provides a practical means to screen for anti-viral drug candidates.
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Affiliation(s)
- Mikael Cristofer Sitinjak
- Department of Veterinary Medicine, College of Veterinary Medicine, National Chung Hsing University, 145 Xingda Road, Taichung 402, Taiwan
| | - Jui-Kai Chen
- Department of Veterinary Medicine, College of Veterinary Medicine, National Chung Hsing University, 145 Xingda Road, Taichung 402, Taiwan
| | - Meng-Yuan Lee
- Department of Veterinary Medicine, College of Veterinary Medicine, National Chung Hsing University, 145 Xingda Road, Taichung 402, Taiwan
| | - Hung-Jen Liu
- Institute of Molecular Biology, College of Life Science, National Chung Hsing University, 145 Xingda Road, Taichung 402, Taiwan; The iEGG and Animal Biotechnology Center, National Chung Hsing University, 250 Kuo Kuang Road, Taichung 40227, Taiwan
| | - Chi-Young Wang
- Department of Veterinary Medicine, College of Veterinary Medicine, National Chung Hsing University, 145 Xingda Road, Taichung 402, Taiwan; The iEGG and Animal Biotechnology Center, National Chung Hsing University, 250 Kuo Kuang Road, Taichung 40227, Taiwan.
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Liu FL, Chang SP, Liu HJ, Liu PC, Wang CY. Genomic and phylogenetic analysis of avian polyomaviruses isolated from parrots in Taiwan. Virus Res 2022; 308:198634. [PMID: 34793873 DOI: 10.1016/j.virusres.2021.198634] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2021] [Revised: 11/11/2021] [Accepted: 11/12/2021] [Indexed: 11/27/2022]
Abstract
Avian polyomavirus (APV) is a non-enveloped virus with a circular double-stranded DNA genome approximately 5000 bp in length. APV was first reported in fledgling budgerigars (Melopsittacus undulatus) as the causative agent of budgerigar fledgling disease, resulting in high parrot mortality rates in the 1980s. This disease has been observed worldwide, and APV has a wide host range including budgerigars, cockatoos, lorikeets, lovebirds, and macaws. Twenty APV isolates have been collected from healthy and symptomatic parrots in Taiwan from 2015 to 2019. These isolates were then amplified via polymerase chain reaction, after which the whole genomes of these isolates were sequenced. The overall APV-positive rate was 14.2%, and the full lengths of the APV Taiwan isolates varied from 4971 to 4982 bps. The APV genome contains an early region that encodes two regulatory proteins (the large tumor antigen (Large T-Ag) and the small tumor antigen (Small t-Ag)) and a late region which encodes the capsid proteins VP1, VP2, VP3, and VP4. The nucleotide identities of the VP1 and VP4 genes ranged from 98.7 to 100%, whereas the nucleotide sequence of the Large T-Ag gene had the highest identity (99.2-100%) relative to other APV isolates from the GenBank database. A phylogenetic tree based on the whole genome demonstrated that the APV Taiwan isolates were closely related to Japanese and Portuguese isolates. Recombination events were analyzed using the Recombination Detection Program version 4 and APV Taiwan isolate TW-3 was identified as a minor parent of the APV recombinants. In this study, we first reported the characterization of the whole genome sequences of APV Taiwan isolates and their phylogenetic relationships with all APV isolates available in the GenBank database.
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Affiliation(s)
- Fang-Lin Liu
- Department of Veterinary Medicine, College of Veterinary Medicine, National Chung Hsing University, 145 Xingda Road, Taichung 402, Taiwan
| | - Shu-Ping Chang
- Department of Laboratory, Chang Bing Show Chwan Memorial Hospital, 6 Lugong Road, Changhua, Lugang, Taiwan
| | - Hung-Jen Liu
- Institute of Molecular Biology, College of Life Science, National Chung Hsing University, 145 Xingda Road, Taichung 402, Taiwan; The iEGG and Animal Biotechnology Center, National Chung Hsing University, 145 Xingda Road, Taichung 402, Taiwan
| | - Pan-Chen Liu
- Department of Veterinary Medicine, College of Veterinary Medicine, National Chung Hsing University, 145 Xingda Road, Taichung 402, Taiwan
| | - Chi-Young Wang
- Department of Veterinary Medicine, College of Veterinary Medicine, National Chung Hsing University, 145 Xingda Road, Taichung 402, Taiwan; The iEGG and Animal Biotechnology Center, National Chung Hsing University, 145 Xingda Road, Taichung 402, Taiwan.
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Chen JK, Hsiao C, Lo AR, Wang CY. Characterization of the nuclear localization sequence of beak and feather disease virus capsid proteins and their assembly into virus-like particles. Virus Res 2020; 289:198144. [PMID: 32889107 DOI: 10.1016/j.virusres.2020.198144] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Revised: 08/20/2020] [Accepted: 08/21/2020] [Indexed: 10/23/2022]
Abstract
Beak and feather disease virus (BFDV) is a single-stranded circular DNA icosahedral virus that belongs to the Circoviridae family. This virus is the causative pathogen of beak and feather disease, which leads to feather loss, malformed claws, and immunosuppression of psittacine birds. Our study produced BFDV virus-like particles (VLPs) including capsid proteins, mutant Cap proteins (Cap ΔNLS54, Cap ΔNLS62, Cap C228S, and Cap ΔNES) and chimeric Cap proteins carrying the epitope (amino acid residues 64-70) of the replication-associated protein (R-Cap, Cap-R, R-Cap ΔNLS54, and Cap ΔNLS54-R). All of the aforementioned VLPs were observed via transmission electron microscopy and verified through immunogold labeling. The nuclear localization sequence (NLS) of the Cap protein was identified between amino acid residues 55-62. Nuclear export of the Cap protein depended on the nuclear export sequence (NES). All VLPs except Cap ΔNLS62 and Cap ΔNES entered the cells 2 h post-infection (hpi) and were shuttled into the nucleus at 8 hpi. Wheat germ agglutinin (WGA) blocked the nuclear entry of Cap proteins at 8 hpi and the nuclear export of Cap proteins at 16 hpi was inhibited by leptomycin B. The nuclear entry of Cap protein was inhibited by importin α and importin β inhibitors, as well as NLS peptides. Moreover, the interactions of Cap proteins and Cap VLPs with both importin α and importin β were characterized via the GST pull-down and immunofluorescence assays. These interactions were blocked by the presence of importin α and importin β inhibitors, as well as NLS peptides. Therefore, our study is the first to describe the precise position of the NLS of the BFDV Cap protein and the interaction of Cap protein with importin α and importin β in vitro.
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Affiliation(s)
- Jui-Kai Chen
- Department of Veterinary Medicine, College of Veterinary Medicine, National Chung Hsing University, 250 Kuo Kuang Road, Taichung 40227, Taiwan
| | - Chiaolong Hsiao
- Institute of Biochemical Sciences, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan
| | - An-Ru Lo
- Department of Veterinary Medicine, College of Veterinary Medicine, National Chung Hsing University, 250 Kuo Kuang Road, Taichung 40227, Taiwan
| | - Chi-Young Wang
- Department of Veterinary Medicine, College of Veterinary Medicine, National Chung Hsing University, 250 Kuo Kuang Road, Taichung 40227, Taiwan; The iEGG and Animal Biotechnology Center, National Chung Hsing University, 250 Kuo Kuang Road, Taichung 40227, Taiwan.
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González-Hein G, Gil IA, Sanchez R, Huaracan B. Prevalence of Aves Polyomavirus 1 and Beak and Feather Disease Virus From Exotic Captive Psittacine Birds in Chile. J Avian Med Surg 2020; 33:141-149. [PMID: 31251501 DOI: 10.1647/2018-349] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Avian polyomavirus disease and psittacine beak and feather disease (PBFD) are both contagious viral diseases in psittacine birds with similar clinical manifestations and characterized by abnormal feathers. To determine the prevalence of Aves polyomavirus 1 (APyV) and beak and feather disease virus (BFDV) in captive, exotic psittacine birds in Chile, feathers from 250 psittacine birds, representing 17 genera, were collected and stored during the period 2013-2016. Polymerase chain reaction testing was used to detect APyV and BFDV were detected in feather bulb samples. The results indicated that 1.6% (4/250) of the samples were positive for APyV, 23.2% (58/250) were positive to BFDV, and 0.8% (2/250) were positive to both APyV and BFDV. This is the first report, to our knowledge, of APyV and BFDV prevalence in captive, exotic psittacine birds in South America. Analysis of 2 Chilean partial sequences of the gene encoding agnoprotein 1a (APyV) and the replication-associated protein (BFDV) extends the knowledge of genomic variability for both APyV and BFDV isolates and their spectrum of hosts. No geographical marker was detected for the local isolates.
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Affiliation(s)
| | - Isabel Aguirre Gil
- Laboratorio de Biotecnología y Patología Acuaática, Departamento de Patología Animal, Facultad de Ciencias Veterinarias, Universidad Austral de Chile, Isla Teja, Valdivia 5090000, Chile
| | - Rodolfo Sanchez
- Bioingentech, Bernardo O'Higgins 1186 oficina 1307, Concepción 4070242, Chile
| | - Bernardo Huaracan
- Bioingentech, Bernardo O'Higgins 1186 oficina 1307, Concepción 4070242, Chile
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Kessler S, Heenemann K, Krause T, Twietmeyer S, Fuchs J, Lierz M, Corman VM, Vahlenkamp TM, Rubbenstroth D. Monitoring of free-ranging and captive Psittacula populations in Western Europe for avian bornaviruses, circoviruses and polyomaviruses. Avian Pathol 2019; 49:119-130. [PMID: 31617746 DOI: 10.1080/03079457.2019.1681359] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Avian pathogens such as bornaviruses, circoviruses and polyomaviruses are widely distributed in captive collections of psittacine birds worldwide and can cause fatal diseases. In contrast, only little is known about their presence in free-ranging psittacines and their impact on these populations. Rose-ringed parakeets (Psittacula krameri) and Alexandrine parakeets (Psittacula eupatria) are non-native to Europe, but have established stable populations in parts of Western Europe. From 2012-2017, we surveyed free-ranging populations in Germany and France as well as captive Psittacula individuals from Germany and Spain for avian bornavirus, circovirus and polyomavirus infections. Samples from two out of 469 tested free-ranging birds (0.4%; 95% confidence interval [CI-95]: 0.1-1.5%) were positive for beak and feather disease virus (BeFDV), whereas avian bornaviruses and polyomaviruses were not detected in the free-ranging populations. In contrast, avian bornaviruses and polyomaviruses, but not circoviruses were detected in captive populations. Parrot bornavirus 4 (PaBV-4) infection was detected by RT-PCR in four out of 210 captive parakeets (1.9%; CI-95: 0.7-4.8%) from four different holdings in Germany and Spain and confirmed by detection of bornavirus-reactive antibodies in two of these birds. Three out of 160 tested birds (1.9%; CI-95: 0.5-5.4%) possessed serum antibodies directed against budgerigar fledgling disease virus (BuFDV). PaBV-4 and BuFDV were also detected in several psittacines of a mixed holding in Germany, which had been in contact with free-ranging parakeets. Our results demonstrate that Psittacula parakeets are susceptible to common psittacine pathogens and their populations in Western Europe are exposed to these viruses. Nevertheless, the prevalence of avian bornaviruses, circoviruses and polyomaviruses in those populations is very low.RESEARCH HIGHLIGHTS Psittacula parakeets are susceptible to bornavirus, circovirus and polyomavirus infection.Introduced Psittacula populations in Europe have been exposed to these viruses.Nevertheless, they may be absent or present at only low levels in free-ranging Psittacula populations.Free-ranging populations in Europe pose a minor threat of transmitting these viruses to captive Psittaciformes.
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Affiliation(s)
- Susanne Kessler
- Institute of Virology, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Kristin Heenemann
- Institute of Virology, Faculty of Veterinary Medicine, University of Leipzig, Leipzig, Germany
| | - Tobias Krause
- City administration Düsseldorf - environmental authority, Düsseldorf, Germany
| | - Sönke Twietmeyer
- Department of Research and Documentation, Eifel National Park, Schleiden-Gemünd, Germany
| | - Jérôme Fuchs
- ISYEB UMR 7205 Institut de Systématique, Evolution, Biodiversité, CNRS, MNHN, UPMC, EPHE, Sorbonne Universités, Muséum National d'Histoire Naturelle, Paris, France
| | - Michael Lierz
- Clinic for Birds, Reptiles, Amphibians and Fish, Justus Liebig University Giessen, Giessen, Germany
| | - Victor Max Corman
- Institute of Virology, Charité-Universitätsmedizin Berlin, Corporate member of Free University, Humboldt-University and Berlin Institute of Health, Berlin, Germany.,German Centre for Infection Research (DZIF), Berlin, Germany
| | - Thomas M Vahlenkamp
- Institute of Virology, Faculty of Veterinary Medicine, University of Leipzig, Leipzig, Germany
| | - Dennis Rubbenstroth
- Institute of Virology, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany.,Institute of Diagnostic Virology, Friedrich-Loeffler-Institut, Greifswald - Insel Riems, Germany
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Chen JK, Hsiao C, Wu JS, Lin SY, Wang CY. Characterization of the endonuclease activity of the replication-associated protein of beak and feather disease virus. Arch Virol 2019; 164:2091-2106. [PMID: 31139938 DOI: 10.1007/s00705-019-04292-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2018] [Accepted: 04/24/2019] [Indexed: 11/25/2022]
Abstract
Beak and feather disease virus (BFDV) belongs to the family Circoviridae. A rolling-circle replication strategy based on a replication-associated protein (Rep) has been proposed for BFDV. The Rep gene of BFDV was expressed and purified, and it was shown to cleave short oligonucleotides containing the conserved nonanucleotide sequence found in the replication origin of circoviruses. This endonuclease activity was most efficient in the presence of the divalent metal ions Mg2+ and Mn2+. Rep proteins containing mutation in the ATPase/GTPase motifs and the 14FTLNN18, 61KKRLS65, 89YCSK92, and 170GKS172 motifs lacked endonuclease activity. The endonuclease activity was not affected by ATPase inhibitors, with the exception of N-ethylmaleimide (NEM), or by GTPase inhibitors, but it was decreased by treatment with the endonuclease inhibitor L-742001. Both the ATPase and GTPase activities were decreased by site-directed mutagenesis and deletion of the ATPase/GTPase and endonuclease motifs. The Rep protein was able to bind a double-stranded DNA fragment of P36 (dsP36) containing the stem-loop structure of the replication origin of BFDV. All of the Rep mutant proteins showed reduced ability to bind this fragment, suggesting that all the ATPase/GTPase and endonuclease motifs are involved in the binding. Other than NEM, all ATPase, GTPase, and endonuclease inhibitors inhibited the binding of the Rep protein to the dsP36 fragment. This is the first report describing the endonuclease activity of the Rep protein of BFDV.
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Affiliation(s)
- Jui-Kai Chen
- Department of Veterinary Medicine, College of Veterinary Medicine, National Chung Hsing University, 250 Kuo Kuang Road, Taichung, 40227, Taiwan
| | - Chiaolong Hsiao
- Institute of Biochemical Sciences, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei, 10617, Taiwan
| | - Jian-Shin Wu
- Department of Veterinary Medicine, College of Veterinary Medicine, National Chung Hsing University, 250 Kuo Kuang Road, Taichung, 40227, Taiwan
| | - Shin-Yi Lin
- Institute of Biochemical Sciences, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei, 10617, Taiwan
| | - Chi-Young Wang
- Department of Veterinary Medicine, College of Veterinary Medicine, National Chung Hsing University, 250 Kuo Kuang Road, Taichung, 40227, Taiwan. .,The iEGG and Animal Biotechnology Center, National Chung Hsing University, 250 Kuo Kuang Road, Taichung, 40227, Taiwan.
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Ho CF, Huang SW, Chan KW, Wu JS, Chang SP, Wang CY. Development of an antigen-capture ELISA for beak and feather disease virus. Arch Virol 2017; 163:145-151. [DOI: 10.1007/s00705-017-3596-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2017] [Accepted: 09/03/2017] [Indexed: 10/18/2022]
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