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      Bioinformatics insight into the spike glycoprotein gene of field porcine epidemic diarrhea strains during 2011–2013 in Guangdong, China

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          Abstract

          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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          Author and article information

          Contributors
          +86 20 39332938 , +86 20 39332841 , caoych@mail.sysu.edu.cn
          Journal
          Virus Genes
          Virus Genes
          Virus Genes
          Springer US (Boston )
          0920-8569
          1572-994X
          26 April 2014
          2014
          : 49
          : 1
          : 58-67
          Affiliations
          GRID grid.12981.33, ISNI 000000012360039X, State Key Laboratory of Biocontrol, School of Life Sciences, , Sun Yat-sen University, ; Guangzhou, 510006 People’s Republic of China
          Article
          1055
          10.1007/s11262-014-1055-y
          7088867
          24771495
          cd1a00c0-d871-4686-a290-fd11f6503400
          © Springer Science+Business Media New York 2014

          This article is made available via the PMC Open Access Subset for unrestricted research re-use and secondary analysis in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the World Health Organization (WHO) declaration of COVID-19 as a global pandemic.

          History
          : 28 November 2013
          : 6 March 2014
          Categories
          Article
          Custom metadata
          © Springer Science+Business Media New York 2014

          Microbiology & Virology
          porcine epidemic diarrhea virus,spike gene,bioinformatics analysis,phylogenetic relationship

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