在免疫功能低下患者长期感染期间,SARS-CoV-2的演变
Andrew D Marques1, Jevon Graham-Wooten2, Ayannah S Fitzgerald2
1Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
mBio
|February 16, 2024
概括
长期的SARS-CoV-2感染在免疫受损患者加速病毒演变,导致突变增加和抗体耐药变体的出现. 这项研究追踪了长时间内在五名患者的病毒变化.
科学领域:
- 病毒学 病毒学
- 免疫学 免疫学 免疫学
- 基因组学就是基因组学.
背景情况:
- 严重急性呼吸系统综合征冠状病毒2 (SARS-CoV-2) 变种对全球健康构成重大威胁.
- 免疫功能低下的人可能会经历长时间的SARS-CoV-2感染,从而为病毒进化创造环境.
- 了解病毒进化途径对于开发有效的治疗方法和控制策略至关重要.
研究的目的:
- 研究长期感染的免疫功能低下患者中SARS-CoV-2的进化途径.
- 描述突变的积累,并确定长期病毒持久性期间出现的特定变异.
- 评估宿主免疫状况和治疗干预对病毒进化的影响.
主要方法:
- 从长期感染SARS-CoV-2 (79-203天) 的五名免疫功能低下患者的病毒基因组序列分析.
- 每个时间点至少生成两个独立的病毒基因组序列,以确保准确性和评估异质性.
- 监测突变率,并识别病毒基因组中的特定替代物,特别是尖端蛋白.
主要成果:
- 与社区背景相比,在免疫受损患者中长期感染SARS-CoV-2导致病毒基因组替代积累率更高.
- 尖蛋白编码区域显示出独特突变的密度明显更高.
- 观察到SARS-CoV-2变种的出现,其中的替代物对单克隆抗体 (bebtelovimab和sotrovimab) 产生了耐药性.
- 尽管患者接受治疗,但没有检测到耐雷梅西维尔的替代物.
结论:
- 长期的SARS-CoV-2感染在免疫功能受损的个体是病毒进化和变种生成的重要驱动因素.
- 尖蛋白是病毒适应的关键目标,导致免疫逃生机制.
- 监测持续性感染中的病毒演变对于了解流行病动态和指导治疗策略至关重要.
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