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The spike glycoprotein genes of porcine epidemic diarrhea viruses isolated in China.

ABSTRACT: The porcine epidemic diarrhea virus (PEDV) causes a highly contagious disease in pigs, which is one of the most devastating viral diseases of swine in the world. In China, PEDV was first confirmed in 1984 and PEDV infections occurred sporadically from 1984 to early 2010. From late 2010 until present, PEDV infections have swept every province or region in China. In this study, we analyzed a total of 186 full-length spike genes and deduced proteins of all available complete genomes of PEDVs isolated in China during 2007-2019. A total of 28 potential recombination events were identified in the spike genes of PEDVs in China. Spike gene recombination not only expanded the genetic diversity of PEDVs in the GII genogroup, but also resulted in the emergence of a new evolutional branch GI-c during 2016-2018. In addition, comparative analysis of spike proteins between GI-a prototype virulent CV777 and GII strain AJ1102 reveals that the amino acid variations could affect 20 potential linear B cell epitopes, demonstrating a dramatic antigen drift in the spike protein. These results provide a thorough view of the information about the genetic and antigenic diversity of PEDVs circulating in China and therefore could benefit the development of suitable strategies for disease control.

SUBMITTER: Wang PH

PROVIDER: S-EPMC8205199 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Project description:Three strains of porcine epidemic diarrhea virus (PEDV) were isolated from dead or diseased pigs at different swine farms in Guangdong during 2011-2013, and their S genes were sequenced. In the same period, seven PEDV strains were also isolated in Guangdong by other laboratories. The spike sequences of 10 Guangdong isolates were compared with vaccine strains and reference pathogenic isolates using six bioinformatics tools. The results revealed that 10 Guangdong strains, excluding strain GDS03, had distinct characteristics in terms of primary structure, secondary structure, high-specificity N-glycosylation sites, potential phosphorylation sites, and palmitoylation sites. Phylogenetic analysis also confirmed these findings and revealed that all PEDV strains were clustered into three distinct groups. Ten Guangdong strains, not including GDS03, belong to Group 1, whereas four vaccine strains and GDS03 belong to Group 3, which is evolutionarily distant from Group 1. Alignment analysis of the neutralizing region amino acid sequences indicated that the amino acid substitutions of Y/D766S, T549S, and G594S that are present in the Guangdong strains, not including GDS03, were a sign of predominant genetic changes among the isolated strains. GDS03 is closely related to the 83P-5 vaccine strain, which suggests that it might represent re-isolation of the vaccine strain or vaccine variants. Taken together, these results indicate that there have been predominant new strains circulating in Guangdong from 2011 to 2013, and the circulating PEDV strains have a genetic composition that is distant from reference strains, especially the vaccine strains; however, the vaccinations might also provide some level of cross-protection, as there have been no changes in the neutralizing epitopes of SS2 and 2C10. This explains why there have been constant but infrequent outbreaks recently in comparison to late 2010 in which PEDV outbreaks were more frequent and severe. In addition, the USA-Colorado-2013 strain had the same amino acid substitutions in the neutralizing regions as the Guangdong strains except GDS03, which suggests that the information and strategies in this study may play role in PEDV variant research in other countries.

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The spike glycoprotein genes of porcine epidemic diarrhea viruses isolated in China.

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