Identification and characterization of ostreid herpesvirus 1 associated with massive mortalities of Scapharca broughtonii broodstocks in China

文献类型： 外文期刊

第一作者： Bai, Changming

作者： Bai, Changming;Gao, Wenhui;Wang, Chongming;Wang, Qingchen;Huang, Jie;Bai, Changming;Wang, Chongming;Huang, Jie;Yu, Tao;Zhang, Tianwen;Qiu, Zhaoxing

作者机构：

关键词： Scapharca broughtonii;Herpes-like virus;Ostreid herpesvirus 1;Mass mortality;Aquaculture

期刊名称：DISEASES OF AQUATIC ORGANISMS （ 影响因子：1.802； 五年影响因子：2.148 ）

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收录情况： SCI

摘要： In the early summer of 2012 and 2013, mass mortalities of blood ark shell (Scapharca [Anadara] broughtonii), broodstocks were reported in several hatcheries on the coast of northern China. Clinical signs including slow response, gaping valves and pale visceral mass were observed in diseased individuals. In response to these reported mortalities, 238 samples were collected from hatcheries at 6 sites. Microscopic changes including lysed connective tissue, dilation of the digestive tubules, eosinophilic inclusion bodies, nuclear chromatin margination and pyknosis were found in affected animals. Transmission electron microscopy (TEM) revealed herpes-like viral particles within the connective tissue of the mantle. Quantative PCR (qPCR) and nested PCR (nPCR) analysis using primers specific for ostreid herpesvirus 1 (OsHV-1) indicated significant higher prevalence of OsHV-1 DNA in cases associated with mass mortalities than those without mass mortalities (p = 0.0012 for qPCR, p < 0.0001 for nPCR). qPCR also indicated that samples associated with mass mortalities carried high viral DNA loads, while the loads in apparently healthy samples were significantly lower (t = 3.15, df = 92, p = 0.002). Sequence analysis of the C2/C6 region of nPCR products revealed 5 newly described variants, which were closely related to each other. Phylogenetic analysis of the 5 virus variants and 48 virus variants reported in previous studies identified 2 main phylogenetic groups, and the 5 virus variants identified here were allocated to a separate subclade. To our knowledge, this is the first report of mass mortalities of bivalve broodstocks associated with OsHV-1 infection.

分类号： Q17

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