S2亚单元在TW型禽类冠状病毒传染性支气管炎病毒的发病过程中发挥着关键作用
Gang Xu1, Yuping Deng1, Yang Li1
1Tianjin Key Laboratory of Agricultural Animal Breeding and Healthy Husbandry, College of Animal Science and Veterinary Medicine, Tianjin Agricultural University, Tianjin 300392, China.
Veterinary microbiology
|February 2, 2024
概括
禽传染性支气管炎病毒 (IBV) 的S2子单元对于其致病性至关重要. 在S2区域的突变显著减少IBV的毒性,提供了对疾病机制的见解.
科学领域:
- 兽医病毒学 兽医病毒学
- 分子病原体的产生.
- 鸟类健康 鸟类健康
背景情况:
- 禽传染性支气管炎病毒 (IBV) 在全球的家禽行业造成重大经济损失.
- S基因,特别是其S1和S2子单元,在IBV病原和宿主细胞相互作用中发挥着至关重要的作用.
- 了解S1和S2对病毒毒性的具体贡献,对于制定有效的控制策略至关重要.
研究的目的:
- 阐明S基因,特别是S1和S2子单元在TW型禽传染性支气管炎病毒 (IBV) 病变发生过程中的作用.
- 产生和描述具有修改S基因区域的复合IBV,以评估它们对毒性和致病性的影响.
主要方法:
- 通过在毒性GD和减弱的aGD菌株之间交换S1或S2区域,生成两个重组IBV (rGDaGD-S1和rGDaGD-S2).
- 在实验室评估胚胎蛋和胚胎脏细胞中的病毒复制.
- 在体内评估无特定病原体 (SPF) 的致病性,包括临床症状,粗大和微观的病变,气管状活动和病毒分布.
主要成果:
- 与野生型GD菌株相比,在S2区域发生突变的重组IBV的毒力显著降低.
- 在S2突变IBV的体外和体内模型中观察到病毒复制的减少.
- 病原性减弱,临床症状较少,病变减少,气管纤维活动改善,SPF具有rGDaGD-S2的病毒分布有限.
结论:
- 禽传染性支气管炎病毒 (IBV) 的S2子单元是类似TW的IBV病原性的关键决定因素.
- 针对S2区域提供了一个潜在的发展途径,用于开发不那么致命的IBV菌株或疫苗.
- 这项研究为进一步研究控制IBV病毒毒性的分子机制提供了基础.
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