Phylogenetic analysis of newly isolated grass carp reovirus.
Grass carp reovirus (GCRV) is a causative agent of haemorrhagic disease in grass carp that drastically affects grass carp aquaculture. Here we report a novel GCRV isolate isolated from sick grass carp that induces obvious cytopathic effect in CIK cells and name it as GCRV096. A large number of GCRV 096 viral particles were found in the infected CIK cells by electron microscope. The shape, size and the arrangement of this virus were similar to those of grass carp reovirus. With the primers designed according to GCRV 873 genome sequences, specific bands were amplified from sick grass carp and the infected CIK cells. The homology rates among vp4, vp6 and vp7 gene in GCRV 096 and those of some GCRV isolates were over 89%. In this study, the sequences of vp4, vp6 and vp7 were used to analyse sequence variation, phylogenetic relationships and genotypes in twenty five GCRV isolates. The results indicated these twenty five GCRV isolates should be attributed to four genotypes. And there were no obvious characteristics in the geographical distribution of GCRV genotype. The study should provide the exact foundation for developing more effective prevention strategies of grass carp haemorrhagic disease.
Guangdong Key Laboratory of Pathogenic Biology and Epidemiology for Aquatic Economic Animals, Guangdong Ocean University, Huguangyan East, Zhanjiang, 524088 China.
Xiu-Ying
XY
Yan
Guangdong Key Laboratory of Pathogenic Biology and Epidemiology for Aquatic Economic Animals, Guangdong Ocean University, Huguangyan East, Zhanjiang, 524088 China.
Ya
Y
Wang
Guangdong Key Laboratory of Pathogenic Biology and Epidemiology for Aquatic Economic Animals, Guangdong Ocean University, Huguangyan East, Zhanjiang, 524088 China.
Ling-Fang
LF
Xiong
Guangdong Key Laboratory of Pathogenic Biology and Epidemiology for Aquatic Economic Animals, Guangdong Ocean University, Huguangyan East, Zhanjiang, 524088 China.
Ji-Chang
JC
Jian
Zhongkai University of Agriculture and Engineering, Guangzhou, 510225 China.
Zao-He
ZH
Wu
Genotype; Grass carp reovirus (GCRV); Identification; Phylogenetic relationship