一个tRNA基因有可能激活干扰素信号传递,涉及选择性终止,并可被La蛋白/SSB抑制
Alan C Kessler1, Sandy Mattijssen1, Gennady H Margolin2
1Section on Molecular and Cell Biology, Eunice Kennedy Shriver National Institute of Child Health and Human Development, Intramural Research Program, National Institutes of Health, Bethesda, MD 20892, United States.
Nucleic acids research
|July 10, 2025
概括
人类tRNA基因TRT-TGT4-1通过RNA聚合酶III (Pol III) 转录激活干扰素刺激基因 (ISG) 反应. 特定的终端序列和侧面元素控制这种非正规的免疫信号通路.
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
- 在RNA生物学,RNA生物学.
背景情况:
- RNA聚合酶III (Pol III) 转录小型非编码RNA,其中一些被免疫系统利用.
- 天生的免疫系统通过像RIG-I.这样的模式识别受体识别了与病原体相关的分子模式,包括5'-三酸盐 (5'ppp) RNA.
研究的目的:
- 为了研究人类tRNA基因TRT-TGT4-1的非正规免疫活性.
- 为了确定控制tRNA基因介导的干扰素刺激基因 (ISG) 反应的序列特征.
主要方法:
- 用TRT-TGT4-1基因感染HEK293T细胞.
- 评估依赖于Pol III转录的ISG反应激活.
- 描述Pol III终端元件及其在ISG活动中的作用.
- 研究La蛋白对ISG信号传递的影响.
主要成果:
- TRT-TGT4-1基因强烈激活ISG反应,需要Pol III转录和特定的侧翼序列.
- 在TRT-TGT4-1中最小的T(4) 终端元件对于ISG活动至关重要.
- tRNA终端子的序列变化,特别是5'-二核酸和T (n) 长度,决定了ISG阳性或阴性状态.
- 用ISG阴性5'GG替换ISG阳性5'AC显著降低了ISG活动.
结论:
- 波尔III终结器可以调节RNA转录特性,影响ISG活动或tRNA成熟.
- 特定的tRNA基因特征,包括终端序列,在天生的免疫信号传递中发挥作用.
- 某些tRNA基因具有免疫反应激活的固有潜力.
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