尽管存在遗传约束,STAT2对 NS5 病毒的耐药性的演变却发生了多次
Ethan C Veit1, Madihah S Salim1, Mariel J Jung1
1Department of Microbiology, Icahn School of Medicine at Mount Sinai, New York, NY, USA.
Nature communications
|June 26, 2024
概括
寨卡病毒和登革热病毒对抗STAT2,一个关键的免疫调节器,导致疾病. 进化表明,对这种对抗性的抵抗在哺乳动物中出现了多次,但往往是以健康成本.
科学领域:
- 病毒学和免疫学 病毒学和免疫学
- 进化生物学 进化生物学
- 宿主-病原体相互作用
背景情况:
- 寨卡和登革热病毒非结构蛋白5 (NS5) 对抗STAT2,这是干扰素信号传递中的关键转录因子.
- 这种对抗性抑制宿主干扰素反应,这对于病毒复制 (病毒性病) 和疾病发展 (发病) 是必不可少的.
- 像小鼠这样的某些物种中STAT2的耐药性限制了病毒热带,将感染限制在免疫受损或人性化的STAT2模型中.
研究的目的:
- 研究STAT2的进化如何影响其易受寨卡病毒和登革热病毒病毒对抗性的敏感性.
- 了解与病毒NS5对抗性产生抗性的进化途径和局限性.
主要方法:
- 评估了38种不同的哺乳动物STAT2蛋白对病毒对抗性的敏感性.
- 分析了在四种不同物种中赋予耐药性的特定氨基酸变化.
- 研究了STAT2耐药性的进化史,包括在子血统中丧失它的实例.
主要成果:
- 病毒NS5对STAT2对抗性的抵抗在哺乳动物进化过程中独立地多次演变.
- 在四种物种中,不同的多种氨基酸替代组被确定为抵抗所必需的,单个变化通常会损害STAT2信号传递.
- 有证据表明,阻力和维持STAT2的基本信号功能之间存在一种权衡,称为"进化".
- 抵抗对抗主义可能会产生适应性成本,正如其早期进化后在一些子系中失去抵抗力所证明的那样.
结论:
- 进化对STAT2病毒对抗性的抵抗是可能的,但需要复杂的进化策略.
- 抵抗的进化受到STAT2维护重要细胞功能的需要的约束,突出了防御和宿主健康之间的平衡.
- 了解这些进化动态对于理解不同物种的病毒病原和宿主病毒相互作用至关重要.
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