Isolation, Identification, and Genomic Analysis of a Novel Reovirus from Healthy Grass Carp and Its Dynamic Proliferation In Vitro and In Vivo

文献类型： 外文期刊

第一作者： Zhang, Ke

作者： Zhang, Ke;Fan, Yuding;Zhang, Ke;Liu, Wenzhi;Li, Yiqun;Zhou, Yong;Meng, Yan;Zeng, Lingbing;Fan, Yuding;Vakharia, Vikram N.

作者机构：

关键词： healthy grass carp reovirus (HGCRV); grass carp reovirus (GCRV); genome; phylogenetic relationship; proliferate

期刊名称：VIRUSES-BASEL （ 影响因子：3.816； 五年影响因子：4.001 ）

ISSN：

年卷期： 2021 年 13 卷 4 期

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收录情况： SCI

摘要： A new grass carp reovirus (GCRV), healthy grass carp reovirus (HGCRV), was isolated from grass carp in 2019. Its complete genome sequence was determined and contained 11 dsRNAs with a total size of 23,688 bp and 57.2 mol% G+C content, encoding 12 proteins. All segments had conserved 5' and 3' termini. Sequence comparisons showed that HGCRV was closely related to GCRV-873 (GCRV-I; 69.57-96.71% protein sequence identity) but shared only 22.65-45.85% and 23.37-43.39% identities with GCRV-HZ08 and Hubei grass carp disease reovirus (HGDRV), respectively. RNA-dependent RNA-polymerase (RdRp) protein-based phylogenetic analysis showed that HGCRV clustered with Aquareovirus-C (AqRV-C) prior to joining a branch common with other aquareoviruses. Further analysis using VP6 amino acid sequences from Chinese GCRV strains showed that HGCRV was in the same evolutionary cluster as GCRV-I. Thus, HGCRV could be a new GCRV isolate of GCRV-I but is distantly related to other known GCRVs. Grass carp infected with HGCRV did not exhibit signs of hemorrhage. Interestingly, the isolate induced a typical cytopathic effect in fish cell lines, such as infected cell shrank, apoptosis, and plague-like syncytia. Further analysis showed that HGCRV could proliferate in grass carp liver (L28824), gibel carp brain (GiCB), and other fish cell lines, reaching a titer of up to 7.5 x 10(4) copies/mu L.

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