›› 2017, Vol. 44 ›› Issue (2): 327-335.doi: 10.16431/j.cnki.1671-7236.2017.02.004

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Cloning and Sequence Analysis of σB Protein Genes of New-type Duck Reovirus Isolated from Guangdong

HUANG Wen-jing, LIANG Guo-zhi, MEI Min-min, LI Xiao-wen, HUANG Shu-jian   

  1. School of Life Science and Engineering, Foshan University, Foshan 528200, China
  • Received:2016-06-23 Online:2017-02-20 Published:2017-02-25

Abstract:

In order to study the genetic variation and evolution of new-type duck reovirus (NDRV) in Guangdong province, some samples (liver and spleen) were collected from different sick ducks in Guangdong province. Eight strains were initially isolated and identified. σB protein genes were amplified, cloned and sequenced by RT-PCR method,and σB protein characteristics of amino acid, antigen and genetic analysis of system evolution were compared with other strains. The results showed that the isolated viruses were the NDRV. Comparison of nucleotide sequences showed the NDRV isolated from duck in Guangdong province were more closely related to DRV reported in other parts of the country, the homology reached 96.6% to 99.5%, the NDRV isolated from duck in Guangdong province were not closely related with ARV and MDRV, the homology was 64.6% to 66.5% and 66.2% to 67.1%, respectively. Homology comparison of nucleotide between 8 strains NDRV were 97.7% to 99.7%.Compared with other strains, NDRV phosphorylation sites were less than ARV and MDRV reference strains, and the most area of the antigen index were high, similar to MDRV. Genetic evolution analysis results showed that NDRV and other domestic DRV were in the evolution of the same branch, but ARV and MDRV were in different branches. The result showed σB protein gene sequences of the NDRV were highly conserved,and NDRV isolated from Guangdong province had no significant regional differences with other regions.

Key words: new-type duck reovirus; σB protein; cloning; sequence analysis

CLC Number: