ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2019, Vol. 50 ›› Issue (3): 592-601.doi: 10.11843/j.issn.0366-6964.2019.03.014

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Isolation and Gene Sequence Analysis of G6P[11] Bovine Rotavirus HY-1 Strain from Yak

LI Ran1, TANG Cheng1,2, LUO Xue1, YUE Hua1,2*   

  1. 1. College of Life Science and Technology, Southwest Minzu University, Chengdu 610041, China;
    2. Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization, Chengdu 610041, China
  • Received:2018-07-11 Online:2019-03-23 Published:2019-03-23

Abstract:

The aim of this study was to isolate and identify bovine rotavirus (BRV) from the diarrhea stool samples of Yak. BRV-positive samples detected by RT-PCR was used to inoculate into MA-104 cells for virus isolation and identification, and the complete genes of VP4, VP6 and VP7 were sequenced to determine their molecular characteristics. The cytopathic effect occurred after three continuous blind passages, and the stable time that cytopathic effect occurred was found after seven passages. The virus titer was 108.39TCID50·mL-1 after plaque purification. The isolate, named HY-1 strain, was confirmed to be BRV by RT-PCR, indirect immunofluorescence and electron microscopy. The complete VP4, VP6 and VP7 genes of HY-1 strain were sequenced successfully, showing that HY-1 strain belong to G6P[11] I2 genotype. The phylogenetic analysis showed that the complete VP4, VP6 and VP7 segments of HY-1 strain were closely genetic related to Chinese bovine DQ-75 strain and Indian bovine M-1 and RUBV319 strains, respectively, which indicated that HY-1 strain may be a reassortant strain. Compared with the domestic G6 and P[11] BRV strains, VP4 and VP7 of HY-1 isolate had significant variation in the important amino acid regions. In this study, a BRV strain was successfully isolated from yak with G6P[11] genotype. To the best of our knowledge, this is the first report on the identification of G6P[11] BRV in China.

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