Pleitotropic 对功能和稳定性的突变影响限制了流感血素的抗原演变
Timothy C Yu1,2, Caroline Kikawa1,3,4, Bernadeta Dadonaite1
1Division of Basic Sciences and Computational Biology Program, Fred Hutchinson Cancer Center, Seattle, WA.
bioRxiv : the preprint server for biology
|June 6, 2025
概括
表观症允许流感血质素 (HA) 突变逃离免疫系统,但无法克服稳定性问题. 这就解释了为什么一些避开抗体的突变不会在人类流感病毒中占主导地位.
科学领域:
- 病毒学 病毒学
- 进化生物学 进化生物学
- 分子生物学分子生物学
背景情况:
- 流感病毒血质素 (HA) 进化需要平衡免疫逃脱与蛋白质功能和稳定性.
- 一种突变的效果取决于其他突变的表现作用 (epistasis) 影响了这个进化过程.
- 在解决抗原漂移和蛋白质约束之间的冲突中,表皮病的作用尚未完全被理解.
研究的目的:
- 调查表观病对人类流感病毒血质素 (HA) 演变的影响.
- 量化H3N2HA中所有可能的氨基酸突变如何影响细胞进入,酸稳定性和抗体中和.
- 确定表皮病可以在多大程度上减轻抗原突变的类效应.
主要方法:
- 在H3N2 HA中对所有单个氨基酸突变的系统测量.
- 检测细胞进入功能,酸性稳定性和通过人血清抗体的中和.
- 对塑造HA演变的表皮相互作用的分析.
主要成果:
- 表观症促进了抗原突变的出现,否则会损害HA的细胞进入.
- 然而,表皮症不足以弥补破坏稳定性的抗原突变.
- 突变强烈逃避抗体,但破坏HA稳定的突变在流通的流感菌株中罕见.
结论:
- 表观症在使流感HA的抗原演变成为可能方面发挥着重要作用.
- Pleitotropic 约束,特别是蛋白质稳定性,限制了流感演变的轨迹.
- 了解这些限制对于预测未来流感病毒演变和疫苗设计至关重要.
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