Abstract
A novel circovirus designated "porcine circovirus type 4" (PCV4) was recently reported in pigs with severe clinical disease in Hunan Province, China. Relatively little is known about the molecular epidemiology of this recently discovered virus. In order to assess the prevalence of PCV4 infection in pigs and to analyze its genomic characteristics, 1683 clinical samples were collected in Inner Mongolia, China, from 2016 to 2018. The overall infection rate of PCV4 was 1.6% (27/1683) at the sample level and 21.6% (11/51) at the farm level, with rates ranging from 3.2% (1/31) to 20.0% (6/30) on different PCV4-positive pig farms. In addition, the PCV4 infection rates at both the sample and farm level increased from 2016 to 2018. This also showed that PCV4 was present in pigs in 2016 in China and therefore did not arrive later than this date. Additionally, our findings showed that PCV4 infections had no association with PCV2 or PCV3 infections. We sequenced the complete genomes of three PCV4 strains and found that the PCV4 strains had a high degree of genetic stability but shared less than 80% sequence identity with other circoviruses. We identified six amino acid mutations in the Rep protein and seven in the Cap protein. Phylogenetic analysis based on Cap and Rep sequences confirmed that the PCV4 strains grouped in an independent branch. Our findings provide important information about the prevalence and genetic characteristics of PCV4 strains.
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This work was supported by grants from the National Key Research and Development Program of China (Grant numbers 2017YFD0500101 and 2016YFD0500401). The funders did not play any role in the design, conclusions, or interpretation of the study.
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NYJ and HJL designed the experiments. ZH, CDY, CZX, and GYW performed the experiments. ZH, YZ, PFH, JFL, ZXL, YWL, and FLR analyzed the data. ZH, FLN, HZ, XYZ, YBX, and NS drew the graphs. ZH, YWL, PFH, and HJL wrote the paper. All authors approved the final manuscript.
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The clinical samples used in this study were obtained with written permission from the farm owners, and sampling was carried out in strict accordance with the Animal Ethics Procedures and Guidelines of the People's Republic of China. All of the animal protocols used in this study were approved by the Ethics Committee of the Military Veterinary Medicine Institute.
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Supplementary Fig. S1
The genomic organization of PCV4. Complete genome sequences of PCV4/NM1 (MT882410) with 1770 nt, containing two inversely arranged ORFs. ORF1 encodes the replicase protein (REP), and ORF2 encodes the capsid protein (CAP). (TIF 14054 KB)
Supplementary Fig. S2
Phylogenetic analysis of the three PCV4 Cap protein genes from this study, together with those of two PCV4 strains and 24 related circoviruses obtained from GenBank. The three PCV4 strains from this study are indicated by red triangles. The tree was constructed using MEGA version 6.06 with 1000 bootstraps replicates and a p-distance model. (a) Neighbor-joining method. (b) Maximum-likelihood method (JPG 2206 KB)
Supplementary Fig. S3
Phylogenetic analysis of the three PCV4 Rep protein genes from this study, together with those of two PCV4 strains and 24 related circoviruses obtained from GenBank. The three PCV4 strains from this study are indicated by red triangles. The tree was constructed using MEGA version 6.06 with 1000 bootstrap replicates and a p-distance model. (a) Neighbor-joining method. (b) Maximum-likelihood method (JPG 1906 KB)
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Ha, Z., Yu, C., Xie, C. et al. Retrospective surveillance of porcine circovirus 4 in pigs in Inner Mongolia, China, from 2016 to 2018. Arch Virol 166, 1951–1959 (2021). https://doi.org/10.1007/s00705-021-05088-w
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DOI: https://doi.org/10.1007/s00705-021-05088-w