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Shi C, Wang Q, Liu Y, Wang S, Zhang Y, Liu C, Hu Y, Zheng D, Sun C, Song F, Yu X, Zhao Y, Bao J, Wang Z. Generation of High-Quality African Swine Fever Virus Complete Genome from Field Samples by Next-Generation Sequencing. Viruses 2024; 16:312. [PMID: 38400087 PMCID: PMC10891787 DOI: 10.3390/v16020312] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2023] [Revised: 02/12/2024] [Accepted: 02/12/2024] [Indexed: 02/25/2024] Open
Abstract
African swine fever (ASF) is a lethal contagious viral disease of domestic pigs and wild boars caused by the African swine fever virus (ASFV). The pandemic spread of ASF has caused severe effects on the global pig industry. Whole-genome sequencing provides crucial information for virus strain characterization, epidemiology analysis and vaccine development. Here, we evaluated the performance of next-generation sequencing (NGS) in generating ASFV genome sequences from clinical samples. Thirty-four ASFV-positive field samples including spleen, lymph node, lung, liver and blood with a range of Ct values from 14.73 to 25.95 were sequenced. For different tissue samples collected from the same sick pigs, the proportion of ASFV reads obtained from the spleen samples was 3.69-9.86 times higher than other tissues. For the high-viral-load spleen samples (Ct < 20), a minimum of a 99.8% breadth of ≥10× coverage was revealed for all the samples. For the spleen samples with Ct ≥ 20, 6/12 samples had a minimum of a 99.8% breadth of ≥10× coverage. A high average depth of sequencing coverage was also achieved from the blood samples. According to our results, high-quality ASFV whole-genome sequences could be obtained from the spleen or blood samples with Ct < 20. The high-quality ASFV genome sequence generated in this study was further used for the high-resolution phylogenetic analysis of the ASFV genomes in the early stage of the ASF epidemic in China. Our study demonstrates that NGS may act as a useful tool for efficient ASFV genome characterization, providing valuable information for disease control.
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Affiliation(s)
- Chuan Shi
- China Animal Health and Epidemiology Center, Qingdao 266032, China (Y.L.); (C.L.); (D.Z.); (C.S.)
- BGI-Qingdao, BGI-Shenzhen, Qingdao 266555, China
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing 518083, China
| | - Qinghua Wang
- China Animal Health and Epidemiology Center, Qingdao 266032, China (Y.L.); (C.L.); (D.Z.); (C.S.)
| | - Yutian Liu
- China Animal Health and Epidemiology Center, Qingdao 266032, China (Y.L.); (C.L.); (D.Z.); (C.S.)
| | - Shujuan Wang
- China Animal Health and Epidemiology Center, Qingdao 266032, China (Y.L.); (C.L.); (D.Z.); (C.S.)
| | - Yongqiang Zhang
- China Animal Health and Epidemiology Center, Qingdao 266032, China (Y.L.); (C.L.); (D.Z.); (C.S.)
| | - Chunju Liu
- China Animal Health and Epidemiology Center, Qingdao 266032, China (Y.L.); (C.L.); (D.Z.); (C.S.)
| | - Yongxin Hu
- China Animal Health and Epidemiology Center, Qingdao 266032, China (Y.L.); (C.L.); (D.Z.); (C.S.)
| | - Dongxia Zheng
- China Animal Health and Epidemiology Center, Qingdao 266032, China (Y.L.); (C.L.); (D.Z.); (C.S.)
| | - Chengyou Sun
- China Animal Health and Epidemiology Center, Qingdao 266032, China (Y.L.); (C.L.); (D.Z.); (C.S.)
| | - Fangfang Song
- China Animal Health and Epidemiology Center, Qingdao 266032, China (Y.L.); (C.L.); (D.Z.); (C.S.)
| | - Xiaojing Yu
- China Animal Health and Epidemiology Center, Qingdao 266032, China (Y.L.); (C.L.); (D.Z.); (C.S.)
| | - Yunling Zhao
- China Animal Health and Epidemiology Center, Qingdao 266032, China (Y.L.); (C.L.); (D.Z.); (C.S.)
| | - Jingyue Bao
- China Animal Health and Epidemiology Center, Qingdao 266032, China (Y.L.); (C.L.); (D.Z.); (C.S.)
| | - Zhiliang Wang
- China Animal Health and Epidemiology Center, Qingdao 266032, China (Y.L.); (C.L.); (D.Z.); (C.S.)
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Dinhobl M, Spinard E, Tesler N, Birtley H, Signore A, Ambagala A, Masembe C, Borca MV, Gladue DP. Reclassification of ASFV into 7 Biotypes Using Unsupervised Machine Learning. Viruses 2023; 16:67. [PMID: 38257767 PMCID: PMC10819123 DOI: 10.3390/v16010067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Revised: 12/23/2023] [Accepted: 12/27/2023] [Indexed: 01/24/2024] Open
Abstract
In 2007, an outbreak of African swine fever (ASF), a deadly disease of domestic swine and wild boar caused by the African swine fever virus (ASFV), occurred in Georgia and has since spread globally. Historically, ASFV was classified into 25 different genotypes. However, a newly proposed system recategorized all ASFV isolates into 6 genotypes exclusively using the predicted protein sequences of p72. However, ASFV has a large genome that encodes between 150-200 genes, and classifications using a single gene are insufficient and misleading, as strains encoding an identical p72 often have significant mutations in other areas of the genome. We present here a new classification of ASFV based on comparisons performed considering the entire encoded proteome. A curated database consisting of the protein sequences predicted to be encoded by 220 reannotated ASFV genomes was analyzed for similarity between homologous protein sequences. Weights were applied to the protein identity matrices and averaged to generate a genome-genome identity matrix that was then analyzed by an unsupervised machine learning algorithm, DBSCAN, to separate the genomes into distinct clusters. We conclude that all available ASFV genomes can be classified into 7 distinct biotypes.
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Affiliation(s)
- Mark Dinhobl
- United States Department of Agriculture, Agricultural Research Service, Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, Orient, NY 11957, USA; (M.D.); (E.S.); (N.T.); (H.B.)
- United States Department of Agriculture, Agricultural Research Service, Foreign Animal Disease Research Unit, National Bio and Agro-Defense Facility, Manhattan, KS 66502, USA
- Center of Excellence for African Swine Fever Genomics, Guilford, CT 06437, USA; (A.S.); (A.A.); (C.M.)
| | - Edward Spinard
- United States Department of Agriculture, Agricultural Research Service, Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, Orient, NY 11957, USA; (M.D.); (E.S.); (N.T.); (H.B.)
- United States Department of Agriculture, Agricultural Research Service, Foreign Animal Disease Research Unit, National Bio and Agro-Defense Facility, Manhattan, KS 66502, USA
- Center of Excellence for African Swine Fever Genomics, Guilford, CT 06437, USA; (A.S.); (A.A.); (C.M.)
| | - Nicolas Tesler
- United States Department of Agriculture, Agricultural Research Service, Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, Orient, NY 11957, USA; (M.D.); (E.S.); (N.T.); (H.B.)
- Oak Ridge Institute for Science and Education (ORISE), Oak Ridge, TN 37830, USA
| | - Hillary Birtley
- United States Department of Agriculture, Agricultural Research Service, Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, Orient, NY 11957, USA; (M.D.); (E.S.); (N.T.); (H.B.)
- Oak Ridge Institute for Science and Education (ORISE), Oak Ridge, TN 37830, USA
| | - Anthony Signore
- Center of Excellence for African Swine Fever Genomics, Guilford, CT 06437, USA; (A.S.); (A.A.); (C.M.)
- National Centre for Foreign Animal Disease, Canadian Food Inspection Agency, Winnipeg, MB R3E 3M4, Canada
| | - Aruna Ambagala
- Center of Excellence for African Swine Fever Genomics, Guilford, CT 06437, USA; (A.S.); (A.A.); (C.M.)
- National Centre for Foreign Animal Disease, Canadian Food Inspection Agency, Winnipeg, MB R3E 3M4, Canada
| | - Charles Masembe
- Center of Excellence for African Swine Fever Genomics, Guilford, CT 06437, USA; (A.S.); (A.A.); (C.M.)
- Department of Zoology, Entomology and Fisheries Sciences, School of Biosciences, College of Natural Sciences, Makerere University, Kampala P.O. Box 7062, Uganda
| | - Manuel V. Borca
- United States Department of Agriculture, Agricultural Research Service, Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, Orient, NY 11957, USA; (M.D.); (E.S.); (N.T.); (H.B.)
- United States Department of Agriculture, Agricultural Research Service, Foreign Animal Disease Research Unit, National Bio and Agro-Defense Facility, Manhattan, KS 66502, USA
- Center of Excellence for African Swine Fever Genomics, Guilford, CT 06437, USA; (A.S.); (A.A.); (C.M.)
| | - Douglas P. Gladue
- United States Department of Agriculture, Agricultural Research Service, Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, Orient, NY 11957, USA; (M.D.); (E.S.); (N.T.); (H.B.)
- United States Department of Agriculture, Agricultural Research Service, Foreign Animal Disease Research Unit, National Bio and Agro-Defense Facility, Manhattan, KS 66502, USA
- Center of Excellence for African Swine Fever Genomics, Guilford, CT 06437, USA; (A.S.); (A.A.); (C.M.)
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Xin G, Kuang Q, Le S, Wu W, Gao Q, Gao H, Xu Z, Zheng Z, Lu G, Gong L, Wang H, Zhang G, Shi M, Sun Y. Origin, genomic diversity and evolution of African swine fever virus in East Asia. Virus Evol 2023; 9:vead060. [PMID: 37868933 PMCID: PMC10590196 DOI: 10.1093/ve/vead060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Revised: 08/29/2023] [Accepted: 10/05/2023] [Indexed: 10/24/2023] Open
Abstract
Since 2018, the outbreaks of genotype II African swine fever virus (ASFV) in China and several eastern Asian countries have caused a huge impact on the local swine industry, resulting in huge economic losses. However, little is known about the origin, genomic diversity, evolutionary features, and epidemiological history of the genotype II ASFV. Here, 14 high-quality complete genomes of ASFVs were generated via sequencing of samples collected from China over the course of 3 years, followed by phylogenetic and phylodynamic analyses. The strains identified were relatively homogeneous, with a total of 52 SNPs and 11 indels compared with the prototype strain HLJ/2018, among which there were four exceptionally large deletions (620-18,023 nt). Evolutionary analyses revealed that ASFV strains distributed in eastern Asia formed a monophyly and a 'star-like' structure centered around the prototype strain, suggesting a single origin. Additionally, phylogenetic network analysis and ancestral reconstruction of geographic state indicated that genotype II ASFV strains in eastern Asia likely originated from Western Europe. Overall, these results contribute to the understanding of the history and current status of genotype II ASFV strains in eastern Asian, which could be of considerable importance in disease control and prevention.
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Affiliation(s)
- Genyang Xin
- State Key Laboratory for Biocontrol, School of Medicine, Shenzhen campus of Sun Yat-sen University, Shenzhen 518107, China
| | - Qiyuan Kuang
- Guangdong Provincial Key Laboratory of Zoonosis Prevention and Control, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, PR China
- African Swine Fever Regional Laboratory of China (Guangzhou), South China Agricultural University, Guangzhou 510642, PR China
- Research Center for African Swine Fever Prevention and Control, South China Agricultural University, Guangzhou 510642, PR China
- Maoming Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong 510642, PR China
| | - Shijia Le
- State Key Laboratory for Biocontrol, School of Medicine, Shenzhen campus of Sun Yat-sen University, Shenzhen 518107, China
| | - Weichen Wu
- State Key Laboratory for Biocontrol, School of Medicine, Shenzhen campus of Sun Yat-sen University, Shenzhen 518107, China
| | - Qi Gao
- Guangdong Provincial Key Laboratory of Zoonosis Prevention and Control, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, PR China
- African Swine Fever Regional Laboratory of China (Guangzhou), South China Agricultural University, Guangzhou 510642, PR China
- Research Center for African Swine Fever Prevention and Control, South China Agricultural University, Guangzhou 510642, PR China
- Maoming Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong 510642, PR China
| | - Han Gao
- Guangdong Provincial Key Laboratory of Zoonosis Prevention and Control, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, PR China
- African Swine Fever Regional Laboratory of China (Guangzhou), South China Agricultural University, Guangzhou 510642, PR China
- Research Center for African Swine Fever Prevention and Control, South China Agricultural University, Guangzhou 510642, PR China
- Maoming Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong 510642, PR China
| | - Zhiying Xu
- Guangdong Provincial Key Laboratory of Zoonosis Prevention and Control, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, PR China
- African Swine Fever Regional Laboratory of China (Guangzhou), South China Agricultural University, Guangzhou 510642, PR China
- Research Center for African Swine Fever Prevention and Control, South China Agricultural University, Guangzhou 510642, PR China
- Maoming Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong 510642, PR China
| | - Zezhong Zheng
- Guangdong Provincial Key Laboratory of Zoonosis Prevention and Control, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, PR China
- African Swine Fever Regional Laboratory of China (Guangzhou), South China Agricultural University, Guangzhou 510642, PR China
- Research Center for African Swine Fever Prevention and Control, South China Agricultural University, Guangzhou 510642, PR China
- Maoming Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong 510642, PR China
| | - Gang Lu
- Guangdong Provincial Key Laboratory of Zoonosis Prevention and Control, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, PR China
- African Swine Fever Regional Laboratory of China (Guangzhou), South China Agricultural University, Guangzhou 510642, PR China
- Research Center for African Swine Fever Prevention and Control, South China Agricultural University, Guangzhou 510642, PR China
- Maoming Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong 510642, PR China
| | - Lang Gong
- Guangdong Provincial Key Laboratory of Zoonosis Prevention and Control, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, PR China
- African Swine Fever Regional Laboratory of China (Guangzhou), South China Agricultural University, Guangzhou 510642, PR China
- Research Center for African Swine Fever Prevention and Control, South China Agricultural University, Guangzhou 510642, PR China
- Maoming Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong 510642, PR China
| | - Heng Wang
- Guangdong Provincial Key Laboratory of Zoonosis Prevention and Control, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, PR China
- African Swine Fever Regional Laboratory of China (Guangzhou), South China Agricultural University, Guangzhou 510642, PR China
- Research Center for African Swine Fever Prevention and Control, South China Agricultural University, Guangzhou 510642, PR China
- Maoming Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong 510642, PR China
| | - Guihong Zhang
- Guangdong Provincial Key Laboratory of Zoonosis Prevention and Control, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, PR China
- African Swine Fever Regional Laboratory of China (Guangzhou), South China Agricultural University, Guangzhou 510642, PR China
- Research Center for African Swine Fever Prevention and Control, South China Agricultural University, Guangzhou 510642, PR China
- Maoming Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong 510642, PR China
- State Key Laboratory for Biocontrol, School of Medicine, Shenzhen campus of Sun Yat-sen University, Shenzhen 518107, China
| | - Mang Shi
- State Key Laboratory for Biocontrol, School of Medicine, Shenzhen campus of Sun Yat-sen University, Shenzhen 518107, China
| | - Yankuo Sun
- Guangdong Provincial Key Laboratory of Zoonosis Prevention and Control, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, PR China
- African Swine Fever Regional Laboratory of China (Guangzhou), South China Agricultural University, Guangzhou 510642, PR China
- Research Center for African Swine Fever Prevention and Control, South China Agricultural University, Guangzhou 510642, PR China
- Maoming Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong 510642, PR China
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Okwasiimire R, Flint JF, Kayaga EB, Lakin S, Pierce J, Barrette RW, Faburay B, Ndoboli D, Ekakoro JE, Wampande EM, Havas KA. Whole Genome Sequencing Shows that African Swine Fever Virus Genotype IX Is Still Circulating in Domestic Pigs in All Regions of Uganda. Pathogens 2023; 12:912. [PMID: 37513759 PMCID: PMC10386283 DOI: 10.3390/pathogens12070912] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Revised: 07/01/2023] [Accepted: 07/03/2023] [Indexed: 07/30/2023] Open
Abstract
Blood samples were collected from pigs at six abattoirs in the Kampala, Uganda metropolitan area from May 2021 through June 2022, and tested for African swine fever virus. Thirty-one samples with cycle threshold values < 26 from pigs with different geographic origins, clinical and pathologic signs, and Ornithodoros moubata exposure underwent whole genome sequencing. The p72 gene was used to genotype the isolates, and all were found to be genotype IX; whole genome sequences to previous genotype IX isolates confirmed their similarity. Six of the isolates had enough coverage to evaluate single nucleotide polymorphisms (SNPs). Five of the isolates differed from historic regional isolates, but had similar SNPs to one another, and the sixth isolate also differed from historic regional isolates, but also differed from the other five isolates, even though they are all genotype IX. Whole genome sequencing data provide additional detail on viral evolution that can be useful for molecular epidemiology, and understanding the impact of changes in genes to disease phenotypes, and may be needed for vaccine targeting should a commercial vaccine become available. More sequencing of African swine fever virus isolates is needed in Uganda to understand how and when the virus is changing.
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Affiliation(s)
- Rodney Okwasiimire
- Central Diagnostic Laboratory, College of Veterinary Medicine, Animal Resources and Biosecurity, Makerere University, Kampala P.O. Box 7062, Uganda
| | - Joseph F Flint
- Department of Public and Ecosystem Health, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853, USA
| | - Edrine B Kayaga
- Central Diagnostic Laboratory, College of Veterinary Medicine, Animal Resources and Biosecurity, Makerere University, Kampala P.O. Box 7062, Uganda
| | - Steven Lakin
- Foreign Animal Disease Diagnostic Laboratory, National Veterinary Services Laboratories, Veterinary Services, Animal and Plant Health Inspection Services, United States Department of Agriculture, Greenport, NY 11957, USA
| | - Jim Pierce
- Foreign Animal Disease Diagnostic Laboratory, National Veterinary Services Laboratories, Veterinary Services, Animal and Plant Health Inspection Services, United States Department of Agriculture, Greenport, NY 11957, USA
| | - Roger W Barrette
- Foreign Animal Disease Diagnostic Laboratory, National Veterinary Services Laboratories, Veterinary Services, Animal and Plant Health Inspection Services, United States Department of Agriculture, Greenport, NY 11957, USA
| | - Bonto Faburay
- Foreign Animal Disease Diagnostic Laboratory, National Veterinary Services Laboratories, Veterinary Services, Animal and Plant Health Inspection Services, United States Department of Agriculture, Greenport, NY 11957, USA
| | - Dickson Ndoboli
- Central Diagnostic Laboratory, College of Veterinary Medicine, Animal Resources and Biosecurity, Makerere University, Kampala P.O. Box 7062, Uganda
| | - John E Ekakoro
- Department of Public and Ecosystem Health, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853, USA
| | - Eddie M Wampande
- Central Diagnostic Laboratory, College of Veterinary Medicine, Animal Resources and Biosecurity, Makerere University, Kampala P.O. Box 7062, Uganda
| | - Karyn A Havas
- Department of Public and Ecosystem Health, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853, USA
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Zhang Y, Wang Q, Zhu Z, Wang S, Tu S, Zhang Y, Zou Y, Liu Y, Liu C, Ren W, Zheng D, Zhao Y, Hu Y, Li L, Shi C, Ge S, Lin P, Xu F, Ma J, Wu X, Ma H, Wang Z, Bao J. Tracing the Origin of Genotype II African Swine Fever Virus in China by Genomic Epidemiology Analysis. Transbound Emerg Dis 2023. [DOI: 10.1155/2023/4820809] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023]
Abstract
The pandemic spread of African swine fever (ASF) has caused serious effects on the global pig industry. Virus genome sequencing and genomic epidemiology analysis play an important role in tracking the outbreaks of the disease and tracing the transmission of the virus. Here we obtained the full-length genome sequence of African swine fever virus (ASFV) in the first outbreak of ASF in China on August 3rd, 2018 and compared it with other published genotype II ASFV genomes including 9 genomes collected in China from September 2018 to October 2020. Phylogenetic analysis on genomic sequences revealed that genotype II ASFV has evolved into different genetic clusters with temporal and spatial correlation since being introduced into Europe and then Asia. There was a strong support for the monophyletic grouping of all the ASFV genome sequences from China and other Asian countries, which shared a common ancestor with those from the Central or Eastern Europe. An evolutionary rate of 1.312 × 10−5 nucleotide substitutions per site per year was estimated for genotype II ASFV genomes. Eight single nucleotide variations which located in MGF110-1L, MGF110-7L, MGF360-10L, MGF505-5R, MGF505-9R, K145R, NP419L, and I267L were identified as anchor mutations that defined genetic clusters of genotype II ASFV in Europe and Asia. This study expanded our knowledge of the molecular epidemiology of ASFV and provided valuable information for effective control of the disease.
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Bao J, Zhang Y, Shi C, Wang Q, Wang S, Wu X, Cao S, Xu F, Wang Z. Genome-Wide Diversity Analysis of African Swine Fever Virus Based on a Curated Dataset. Animals (Basel) 2022; 12:ani12182446. [PMID: 36139306 PMCID: PMC9495133 DOI: 10.3390/ani12182446] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2022] [Revised: 09/11/2022] [Accepted: 09/12/2022] [Indexed: 11/29/2022] Open
Abstract
Simple Summary African swine fever (ASF) is one of the most important animal diseases affecting the domestic swine population globally. Whole-genome sequence analysis on the circulating African swine fever virus (ASFV) strains would provide valuable information in tracking the outbreaks of the disease. The aim of this study was to prepare a curated dataset of ASFV genome sequences and investigate genome-wide diversity of circulating ASFV strains. We prepared a curated dataset containing 123 high-quality ASFV genome sequences representing 10 genotypes collected from 28 countries between 1949 and 2020. Phylogenetic analysis based on whole-genome sequences provided high-resolution topology in genotyping ASFV isolates, which was supported by pairwise genome sequence similarity comparison. Wide distribution and high variation of tandem repeat sequences were found in ASFV genomes. Structural variation and highly variable poly G or poly C tracts were also identified. This study improved our understanding on the patterns of genetic variation of ASFV and facilitated future studies on ASFV molecular epidemiology. Abstract African swine fever (ASF) is a lethal contagious viral disease of domestic pigs and wild boars caused by the African swine fever virus (ASFV). The pandemic spread of ASF has had serious effects on the global pig industry. Virus genome sequencing and comparison play an important role in tracking the outbreaks of the disease and tracing the transmission of the virus. Although more than 140 ASFV genome sequences have been deposited in the public databases, the genome-wide diversity of ASFV remains unclear. Here we prepared a curated dataset of ASFV genome sequences by filtering genomes with sequencing errors as well as duplicated genomes. A total of 123 ASFV genome sequences were included in the dataset, representing 10 genotypes collected between 1949 and 2020. Phylogenetic analysis based on whole-genome sequences provided high-resolution topology in differentiating closely related ASFV isolates, and drew new clues in the classification of some ASFV isolates. Genome-wide diversity of ASFV genomes was explored by pairwise sequence similarity comparison and ORF distribution comparison. Tandem repeat sequences were found widely distributed and highly varied in ASFV genomes. Structural variation and highly variable poly G or poly C tracts also contributed to the genome diversity. This study expanded our knowledge on the patterns of genetic diversity and evolution of ASFV, and provided valuable information for diagnosis improvement and vaccine development.
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Affiliation(s)
- Jingyue Bao
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, China
- China Animal Health and Epidemiology Center, Qingdao 266032, China
| | - Yong Zhang
- China Animal Health and Epidemiology Center, Qingdao 266032, China
- Lars Bolund Institute of Regenerative Medicine, Qingdao-Europe Advanced Institute for Life Sciences, BGI-Qingdao, BGI-Shenzhen, Qingdao 266555, China
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing 518083, China
| | - Chuan Shi
- China Animal Health and Epidemiology Center, Qingdao 266032, China
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing 518083, China
- BGI-Qingdao, BGI-Shenzhen, Qingdao 266555, China
| | - Qinghua Wang
- China Animal Health and Epidemiology Center, Qingdao 266032, China
| | - Shujuan Wang
- China Animal Health and Epidemiology Center, Qingdao 266032, China
| | - Xiaodong Wu
- China Animal Health and Epidemiology Center, Qingdao 266032, China
| | - Shengbo Cao
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, China
| | - Fengping Xu
- Lars Bolund Institute of Regenerative Medicine, Qingdao-Europe Advanced Institute for Life Sciences, BGI-Qingdao, BGI-Shenzhen, Qingdao 266555, China
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing 518083, China
- Correspondence: (F.X.); (Z.W.)
| | - Zhiliang Wang
- China Animal Health and Epidemiology Center, Qingdao 266032, China
- Correspondence: (F.X.); (Z.W.)
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