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      Attenuation of a virulent swine acute diarrhea syndrome coronavirus strain via cell culture passage

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          Abstract

          Swine acute diarrhea syndrome coronavirus (SADS-CoV) is a newly identified enteric alphacoronavirus that causes fatal diarrhea in newborn piglets in China. Here, we propagated a virulent strain SADS-CoV/CN/GDWT/2017 in Vero cells for up to 83 passages. Four strains of SADS-CoV/GDWT-P7, -P18, -P48 and -P83 were isolated and characterized. Sequence alignments showed that these four novel strains exhibited 16 nucleotide mutations and resultant 10 amino acid substitutions in open reading frame 1a/1b, spike, NS3a, envelope, membrane and nucleocapsid proteins. Furthermore, a 58-bp deletion in NS7a/7b was found in P48 and P83 strains, which led to the loss of NS7b and 38 amino acid changes of NS7a. Pig infection studies showed that the P7 strain caused typical watery diarrhea, while the P83 strain induced none-to-mild, delayed and transient diarrhea. This is the first report on cell adaption of a virulent SADS-CoV strain, which gives information on the potential virulence determinants of SADS-CoV.

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          Multiple sequence alignment with the Clustal series of programs.

          R Chenna (2003)
          The Clustal series of programs are widely used in molecular biology for the multiple alignment of both nucleic acid and protein sequences and for preparing phylogenetic trees. The popularity of the programs depends on a number of factors, including not only the accuracy of the results, but also the robustness, portability and user-friendliness of the programs. New features include NEXUS and FASTA format output, printing range numbers and faster tree calculation. Although, Clustal was originally developed to run on a local computer, numerous Web servers have been set up, notably at the EBI (European Bioinformatics Institute) (http://www.ebi.ac.uk/clustalw/).
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            Live, attenuated coronavirus vaccines through the directed deletion of group-specific genes provide protection against feline infectious peritonitis.

            Bert Jan Haijema, Peter Rottier, Haukeline Volders (2004)
            Feline infectious peritonitis (FIP) is a fatal immunity-mediated disease caused by mutants of a ubiquitous coronavirus. Since previous attempts to protect cats under laboratory and field conditions have been largely unsuccessful, we used our recently developed system of reverse genetics (B. J. Haijema, H. Volders, and P. J. M. Rottier, J. Virol. 77:4528-4538, 2003) for the development of a modified live FIP vaccine. With this objective, we deleted the group-specific gene cluster open reading frame 3abc or 7ab and obtained deletion mutant viruses that not only multiplied well in cell culture but also showed an attenuated phenotype in the cat. At doses at which the wild-type virus would be fatal, the mutants with gene deletions did not cause any clinical symptoms. They still induced an immune response, however, as judged from the high levels of virus-neutralizing antibodies. The FIP virus (FIPV) mutant lacking the 3abc cluster and, to a lesser extent, the mutant missing the 7ab cluster, protected cats against a lethal homologous challenge; no protection was obtained with the mutant devoid of both gene clusters. Our studies show that the deletion of group-specific genes from the coronavirus genome results in live attenuated candidate vaccines against FIPV. More generally, our approach may allow the development of vaccines against infections with other pathogenic coronaviruses, including that causing severe acute respiratory syndrome in humans.
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              Mutations in the spike gene of porcine epidemic diarrhea virus associated with growth adaptation in vitro and attenuation of virulence in vivo

              Tetsuo Sato, Natsumi Takeyama, Atsushi Katsumata … (2011)
              Previously, we have reported that a serial passage of 83P-5 strain of porcine epidemic diarrhea virus (PEDV) in Vero cells resulted in a growth adaptation of the virus in cultured cells at the 22nd passage. In this study, we further maintained the 83P-5 in Vero cells up to the 100th passage and analyzed changes in the spike (S), membrane (M), and nucleocapsid (N) gene sequences and pathogenicity of the virus at the 34th, 61st, and 100th passage levels. Sequence analyses revealed a strong selection for the S gene of 83P-5 in Vero cells, and virtually all mutations occurring at the 34th and 61st passages had been carried over to the 100th-passaged virus. In contrast, the viral M and N genes showed a strong conservation during the serial passage. Pigs experimentally infected with the 34th- or 61st-passaged virus, but not the 100th-passaged virus, exhibited diarrhea, indicating an attenuation of the 83P-5 at the 100th passage. Interestingly, S protein of the attenuated 100th-passaged 83P-5 showed a remarkable sequence similarity to that of previously reported DR-13 strain of attenuated PEDV that also had been established by serial passage in Vero cells. Further studies will be required to define whether the mutations in the S gene of 83P-5 that had been selected and accumulated during the serial passages are indeed the causalities of the growth adaptation in vitro and the attenuation of virulence in vivo.
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                Author and article information

                Contributors
                T. Lan
                J.Y. Ma
                Journal
                Journal ID (nlm-ta): Virology
                Journal ID (iso-abbrev): Virology
                Title: Virology
                Publisher: Elsevier Inc.
                ISSN (Print): 0042-6822
                ISSN (Electronic): 1096-0341
                Publication date PMC-release: 21 September 2019
                Publication date (Print): December 2019
                Publication date (Electronic): 21 September 2019
                Volume: 538
                Pages: 61-70
                Affiliations
                [1]College of Animal Science, South China Agricultural University, Guangzhou, China
                Author notes
                [∗ ]Corresponding author. lantian2016@ 123456scau.edu.cn
                [∗∗ ]Corresponding author. majy2400@ 123456scau.edu.cn
                [1]

                These authors contributed equally to this work.

                Article
                Publisher ID: S0042-6822(19)30266-1
                DOI: 10.1016/j.virol.2019.09.009
                PMC ID: 7112038
                PubMed ID: 31580972
                SO-VID: a749bfbc-1a3a-4503-a9d0-df14ccb5af11
                Copyright © © 2019 Elsevier Inc. All rights reserved.
                License:

                Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.

                History
                Date received : 19 June 2019
                Date revision received : 16 September 2019
                Date accepted : 18 September 2019
                Categories
                Subject: Article

                ScienceOpen disciplines: Microbiology & Virology
                Keywords: sads-cov,attenuation,cell adaptation,genomic analysis,pathogenicity,ns7a/7b
                Data availability:
                ScienceOpen disciplines: Microbiology & Virology
                Keywords: sads-cov, attenuation, cell adaptation, genomic analysis, pathogenicity, ns7a/7b

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