在病毒感染期间,人类tRNA池的基本性和动态表达
Noa Aharon-Hefetz1, Michal Schwartz1, Einav Aharon1
1Department of Molecular Genetics, Weizmann Institute of Science, Rehovot, 76100, Israel.
Molecular systems biology
|January 20, 2026
概括
像人类细胞巨乳病毒 (HCMV) 这样的病毒操纵宿主转移RNA (tRNA) 来进行复制,而SARS-CoV-2的影响较小. 特定的tRNA和酶极大地影响病毒感染力和宿主细胞生长.
科学领域:
- 分子病毒学分子病毒学
- 宿主-病原体相互作用
- 基因表达规范 基因表达规范
背景情况:
- 病毒依赖宿主翻译机制,包括细胞转移RNA (tRNA) 池,因为它们缺乏tRNA基因.
- 了解病毒如何与宿主tRNA环境相互作用和改变,对于破译病毒复制策略至关重要.
研究的目的:
- 在人类细胞巨核病毒 (HCMV) 和SARS-CoV-2感染期间分析成熟的tRNA水平和修改.
- 研究病毒编码子使用与宿主细胞过程 (增殖与分化) 之间的关系.
- 使用CRISPR屏幕识别影响病毒感染性的特定宿主tRNA和tRNA修饰酶.
主要方法:
- 成熟的tRNA测序是在感染HCMV和SARS-CoV-2的细胞上进行的.
- 分析了病毒编码器使用模式,并与人类基因编码器使用特征进行了比较.
- 采用系统的CRISPR-Cas9屏幕来评估人类tRNA基因和修饰酶在病毒感染中的作用.
主要成果:
- HCMV显著改变了成熟的tRNA水平和转录后修饰,主要是由病毒因素驱动的,而SARS-CoV-2的影响很小.
- HCMV病毒基因表现出与宿主细胞分化一致的密码使用,而SARS-CoV-2基因与扩散特征相匹配.
- 克里斯普尔屏幕识别了特定的tRNA和酶,可以差异调节HCMV感染力和宿主细胞生长.
结论:
- HCMV积极操纵宿主tRNA格局,包括修改,以优化其复制.
- 病毒在调整它们的编码子使用以适应宿主细胞状态时表现出不同的策略 (增殖与分化).
- 主体tRNA和相关酶代表病毒感染中的关键决定因素和潜在的治疗点.
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