Abstract
Porcine circovirus 3 (PCV3) is a recently identified virus that is associated with reproductive failure, porcine dermatitis and nephropathy syndrome, and multi-systemic inflammation. To investigate the molecular epidemic characteristics and genetic evolution of PCV3 in northern China, a commercial TaqMan-based real-time quantitative PCR kit was used to detect PCV3 in 435 tissue specimens collected from pigs with various clinical signs from 105 different swine farms in northern China. The results showed that 48 out of 105 (45.7%) farms and 97 out of 435 (22.3%) samples tested positive for PCV3. Of the 97 PCV3-positive samples, 80 (82.5%) tested positive for other pathogens. PCV3 was found more frequently in pigs with reproductive failure than in those with other clinical signs. This study is the first to detect PCV3 in Tianjin. The complete genome sequences of six PCV3 isolates and the capsid (Cap) protein gene sequences of 11 isolates were determined. Based on the predicted amino acids at positions 24 and 27 of the Cap protein and their evolutionary relationships, the 17 PCV3 strains obtained from northern China and 49 reference strains downloaded from the GenBank database were divided into four major groups (3a-3d). An analysis of selection pressure and polymorphism indicated that the PCV3 Cap protein seems to be evolving under balancing selection, that the population is in dynamic equilibrium, and that no population expansion occurred during the study period. Our results provide new information about the molecular epidemiology and evolution of PCV3.
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Acknowledgements
This research was supported by the Program of the Modern Agriculture Industry Technology System Foundation of Hebei Province (HBCT2018110207), Science and Technology Innovation Program of Hebei Province for Graduate Students (CXZZBS2019095), and Key R & D Projects in Hebei Province, China (19226622D).
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Appendix 1
Appendix 1
No. | Strain name | GenBank accession no. | Collection location | Collection date | Gene type |
---|---|---|---|---|---|
1 | PCV3/CH/HB/CZ-2/2017 | MG727537 | Hebei | 2017 | Complete genome |
2 | PCV3/CH/HB/BD/2017 | MG727538 | Hebei | 2017 | Complete genome |
3 | PCV3/CH/HB/CZ-1/2017 | MG727539 | Hebei | 2017 | Complete genome |
4 | PCV3/CH/HB/SJZ/2017 | MG727540 | Hebei | 2017 | Complete genome |
5 | PCV3/CH/HB/HD/2017 | MH101645 | Hebei | 2017 | Complete genome |
6 | PCV3/CH/Tianjin-1/2018 | MH547276 | Tianjin | 2018 | Complete genome |
7 | PCV3/CH/Liaoning-1/2018 | MH547277 | Liaoning | 2018 | Full-length cap gene |
8 | PCV3/CH/Beijing-1/2016 | MH547278 | Beijing | 2016 | Full-length cap gene |
9 | PCV3/CH/Beijing-2/2018 | MH547279 | Beijing | 2018 | Full-length cap gene |
10 | PCV3/CH/Shanxi-1/2018 | MH547280 | Shanxi | 2018 | Full-length cap gene |
11 | PCV3/CH/Shanxi-2/2018 | MH548436 | Shanxi | 2018 | Full-length cap gene |
12 | PCV3/CH/Shandong-1/2018 | MH548437 | Shandong | 2018 | Full-length cap gene |
13 | PCV3/CH/Liaoning-2/2018 | MH548438 | Liaoning | 2018 | Full-length cap gene |
14 | PCV3/CH/Tianjin-2/2017 | MH579786 | Tianjin | 2017 | Full-length cap gene |
15 | PCV3/CH/HB-CD/2018 | MH636587 | Hebei | 2018 | Full-length cap gene |
16 | PCV3/CH/HB-ZJK/2018 | MH636589 | Hebei | 2018 | Full-length cap gene |
17 | PCV3/CH/HB-TS/2018 | MH636590 | Hebei | 2018 | Full-length cap gene |
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Gu, W., Shi, Q., Wang, L. et al. Detection and phylogenetic analysis of porcine circovirus 3 in part of northern China from 2016 to 2018. Arch Virol 165, 2003–2011 (2020). https://doi.org/10.1007/s00705-020-04709-0
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DOI: https://doi.org/10.1007/s00705-020-04709-0