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Molecular characterization of HLJ-073, a recombinant canine coronavirus strain from China with an ORF3abc deletion. Arch Virol. 2019 May 31

Si Chen,Dafei Liu,Jin Tian,Hongtao Kang,Dongchun Guo,Qian Jiang,Jiasen Liu,Zhijie Li,Xiaoliang Hu,Liandong Qu

 

Arch Virol. 2019 May 31. doi: 10.1007/s00705-019-04296-9

 

Abstract

Canine enteric coronaviruses (CCoVs) are important enteric pathogens of dogs. CCoVs with different variations are typically pantropic and pathogenic in dogs. In this study, we isolated a CCoV, designated HLJ-073, from a dead 6-week-old male Pekingese with gross lesions and diarrhea. Interestingly, sequence analysis suggested that HLJ-073 contained a 350-nt deletion in ORF3abc compared with reference CCoV isolates, resulting in the loss of portions of ORF3a and ORF3c and the complete loss of ORF3b. Phylogenetic analysis based on the S gene showed that HLJ-073 was more closely related to members of the FCoV II cluster than to members of the CCoV I or CCoV II cluster. Furthermore, recombination analysis suggested that HLJ-073 originated from the recombination of FCoV 79-1683 and CCoV A76, which were both isolated in the United States. Cell tropism experiments suggested that HLJ-073 could effectively replicate in canine macrophages/monocytes and human THP-1 cells. This is the first report of the isolation of strain HLJ-073 in China, and this virus has biological characteristics that are different from those of other reported CCoVs.

 

KEYWORDS:

Canine coronavirus; ORF3abc; Pantropic; Recombination; Viral cell tropism

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