Acta Veterinaria et Zootechnica Sinica ›› 2021, Vol. 52 ›› Issue (7): 2065-2072.doi: 10.11843/j.issn.0366-6964.2021.07.029

• RESEARCH NOTES • Previous Articles    

Molecular Characteristics Analysis of HE Genes of Bovine Torovirus

ZHAO Long1, TANG Cheng1,2, YUE Hua1,2*   

  1. 1. College of Animal&Veterinary Sciences, Southwest Minzu University, Chengdu 610041, China;
    2. Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization, Chengdu 610041, China
  • Received:2020-11-23 Online:2021-07-23 Published:2021-07-23

Abstract: The purpose of this study was to characterize the molecular characteristics of the HE genes of bovine torovirus (BToV). An RT-PCR assay was used to detect BToV from 94 diarrheic fecal samples collected in Liaoning, Henan, and Sichuan provinces and full-length hemagglutinin-esterase (HE) genes were further amplified from the positive samples. Approximate 10.64% (10/94) samples were detected as BToV positive, and 15 full-length HE genes were sequenced from 10 positive samples, including 9 genotype Ⅱ strains and 6 genotype Ⅲ strains. Among the 10 positive samples, 5 samples were co-infected with genotype Ⅱ and Ⅲ strains, 1 sample was infected with genotype Ⅲ only and 4 samples were infected with genotype Ⅱ strains only. Compared with other available genotype Ⅲ BToV HE genes in the GenBank database, 4 unique amino acid variations were found in the HE gene, including 2 variations in the lectin domain which may affect HE receptor binding. Recombination analysis showed that BToV genotype Ⅲ strains may be derived from the recombination of genotype Ⅱand genotype Ⅰstrains in the HE gene. This study is the first confirmation of genotype Ⅲ BToV in China and the co-infection of genotype Ⅱ and Ⅲ strains. These findings contributed to the diagnosis and control of bovine diarrhea in China and enhance the current understanding of the genetic evolution of BToV.

Key words: bovine torovirus, HE gene, genotype Ⅲ, recombination

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