在尖端蛋白编码区域的APOBEC3相关突变促进了SARS-CoV-2的进化
Jiaying Shen1,2,3, Xinxin Xu4, Junyan Fan2,3,5
1Tongji University School of Medicine, Tongji University, Shanghai 200120, China.
Heliyon
|June 13, 2024
概括
在COVID-19患者中,炎症因素可能会激活APOBEC3 (阿波蛋白B mRNA编辑催化子单元类蛋白3),可能导致SARS-CoV-2的演变. APOBEC3B和USP18作为抑制病毒传播和免疫规避的治疗点具有前途.
科学领域:
- 病毒学 病毒学
- 分子生物学分子生物学
- 免疫学 免疫学 免疫学
背景情况:
- SARS-CoV-2 的演变受宿主因素的影响.
- APOBEC3酶与病毒基因组编辑有关.
- 在COVID-19中,炎症反应可能会影响APOBEC3活动.
研究的目的:
- 调查APOBEC3相关突变在SARS-CoV-2感染性和免疫逃避中的作用.
- 阐明APOBEC3表达,疾病严重程度和病毒演变之间的关系.
- 为了确定控制SARS-CoV-2传播的潜在治疗点.
主要方法:
- 在SARS-CoV-2基因组中分析与APOBEC3相关的C>U突变.
- 在患者血液中量化APOBEC3A,APOBEC3B和APOBEC3GmRNA表达.
- 识别涉及APOBEC3蛋白质的蛋白质相互作用 (例如,USP18).
- 在USP18,ACE2和TMPRSS2表达之间的相关性分析.
- 基因淘汰和子宫外表达研究以评估功能影响.
主要成果:
- C>U突变是SARS-CoV-2的一个显著突变类型.
- APOBEC3A,APOBEC3B和APOBEC3G的mRNA水平随着COVID-19的严重程度而增加.
- APOBEC3B上调与中性粒细胞比例和疾病严重程度有关.
- USP18蛋白与APOBEC3蛋白相互作用,其表达与ACE2/TMPRSS2.2相关.
- USP18 Knockdown 降低了 APOBEC3B 的表达; APOBEC3B 异位表达增强了病毒感染力.
- 特定的C>U突变 (S371F,S373L,S375F) 提供免疫逃脱.
结论:
- 由炎症上调的APOBEC3酶可能推动SARS-CoV-2的进化和传播.
- 在APOBEC3驱动的病毒进化途径中,USP18起到调解作用.
- APOBEC3B和USP18代表了抑制SARS-CoV-2进化和免疫逃避的潜在治疗点.
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