免疫系统缺陷不会改变SARS-CoV-2的进化速度,但通过延长病毒的持续性,有利于突变的出现
Laura Manuto1, Martina Bado1, Marco Cola2
1Department of Molecular Medicine, DMM, University of Padova, 35121 Padova, Italy.
Viruses
|March 28, 2024
概括
免疫功能低下的患者患有较长时间的COVID-19感染,但类似的SARS-CoV-2突变率. 免疫系统减弱并没有增加宿主体内的病毒基因组不稳定性或变异性.
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:
- 免疫抑制个体经常经历长时间的SARS-CoV-2感染,导致人们担心病毒突变和变种出现的增加.
- 主体免疫,抗病毒疗法和病毒进化之间的相互作用对于理解SARS-CoV-2 (严重急性呼吸系统综合征冠状病毒2) 动态至关重要.
研究的目的:
- 调查免疫功能低下患者的免疫功能受损是否会导致SARS-CoV-2更大的基因组不稳定性.
- 在SARS-CoV-2感染期间,比较免疫受损和非免疫受损个体之间的宿主内病毒进化和突变积累.
主要方法:
- 从8名免疫力低下和14名免疫力低下的SARS-CoV-2感染患者中采集了长度鼻拭子.
- 使用基于探针的丰富方法进行深度测序,以准确评估宿主内部的病毒进化,并最大限度地减少PCR诱导的人工突变.
- 在共识和低频突变水平上分析了病毒准物种的变异性.
主要成果:
- 与免疫力低下的患者相比,免疫力低下的患者的SARS-CoV-2感染持续时间明显更长.
- 尽管感染时间较长,但新型宿主内病毒突变的获取率在两组之间是可比的.
- 分析显示,在免疫受损和非免疫受损患者中,病毒群体的变异性相似,包括低频率突变.
结论:
- 仅仅免疫系统受损似乎不会增加宿主体内的SARS-CoV-2的基因组变异性.
- 这些发现表明,超出免疫状态的因素可能会显著影响病毒进化和免疫功能低下个体中SARS-CoV-2变种的出现.
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