Isolation, Characterization, and Comparative Analysis of Two Subtypes of Goose Astrovirus in Guangdong Province, China
文献类型： 外文期刊
作者： Liu, Chenggang 1 ; Li, Linlin 1 ; Dong, Jiawen 1 ; Jin, Jin 2 ; Xiang, Yong 1 ; Zhang, Junqin 1 ; Zhai, Qi 1 ; Huang, Yunzhen 1 ; Sun, Binyi 2 ; Liao, Ming 1 ; Sun, Minhua 1 ;
作者机构： 1.Guangdong Acad Agr Sci, Inst Anim Hlth, Key Lab Prevent & Control Avian Influenza & Other, Minist Agr & Rural Affairs,Key Lab Livestock Dis P, Guangzhou 510640, Peoples R China
2.Shanwei Acad Agr Sci, Shanwei 516699, Peoples R China
3.Zhongkai Univ Agr & Engn, Coll Anim Sci & Technol, Guangzhou 510225, Peoples R China
关键词： goose astrovirus; gout; phylogenetic analysis; tissue tropism; protein structure
期刊名称：MICROORGANISMS （ 影响因子：4.2； 五年影响因子：4.6 ）
ISSN：
年卷期： 2025 年 13 卷 5 期
页码：
收录情况： SCI
摘要： Since 2017, an infectious disease characterized by gosling gout and caused by goose astrovirus (GAstV) has affected geese in most major goose-producing regions of China. In this study, a total of 385 geese displaying gout symptoms were sampled from 12 cities in Guangdong Province, China, between 2019 and 2021. RT-PCR analysis revealed that all samples were positive for GAstV (385/385), with GAstV-II being the predominant subtype, accounting for 90.4% (348/385) of the cases. Co-infection with GAstV-I and GAstV-II was detected in 50.4% (194/385) of the samples. Additionally, different GAstV subtypes were successfully isolated using goose embryos, namely GDYJ-21-01 (GAstV-I) and GDZJ-21-01 (GAstV-II). Analysis of viral copy numbers in major pathological tissues following infection of goslings and goose embryos revealed that GDZJ strain exhibited broader tissue tropism than GDYJ strain. Compared to other tissues, GDYJ strain displayed tissue tropism exclusively in the cecal tonsils of goslings and the allantoic fluid of embryos. Structural prediction and alignment using AlphaFold 2.0 identified an alpha-helix in the S223-A226 region of the GDZJ VP34 protein, while a loop structure was observed in the Q235-Q237 region of the corresponding GDYJ VP34 protein. Furthermore, although the VP27 protein regions of both subtypes contained five beta-sheet structures, the overall sequence similarity was relatively low, at 37.1%. This study broadens our understanding of the prevalence differences among GAstV subtypes and provides valuable insights into the development of reagents for preventing these viral infections.
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