通过双链RNA结合蛋白DGCR8控制干扰素反应的逆转移素驱动激活
Ana Gázquez-Gutiérrez1,2, Priscilla Chin3, Guillermo Peris2,4
1Department of Biochemistry and Molecular Biology II, Faculty of Pharmacy, University of Granada, Granada 18071, Spain.
Nucleic acids research
|March 5, 2026
概括
双链RNA结合蛋白DGCR8通常通过控制可转移元素的内源dRNA来防止免疫过度激活. 它的失活会触发有害的I型干扰素反应,与22q11.2删除综合征相关.
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
- 遗传学 遗传学 是一个
背景情况:
- I型干扰素 (IFN) 反应对于对病毒的天生的免疫力至关重要,但需要严格监管.
- IFN通路的调节失调可能导致过度的免疫激活和病原性.
- 内源双链RNA (dsRNA) 如果不适当管理,可以触发免疫反应.
研究的目的:
- 调查DGCR8在调节I型IFN反应中的作用.
- 为了识别触发IFN信号的内源dsRNA的来源.
- 探索这个机制在22q11.2删除综合征 (22qDS) 中的重要性.
主要方法:
- 研究了DGCR8失活对人类细胞IFN反应的影响.
- 分析了内源性dsRNA的起源,重点关注mRNA中的可移植元素 (TE).
- 利用来自22qDS患者的细胞来评估DGCR8水平和IFN反应.
主要成果:
- 由于DGCR8的失活,TEs (LINE,SINE) 中的内源dSRNA会在mRNA中积累.
- 累积的dsRNA激活了MDA5-MAVS通路,触发了I型IFN反应.
- 来自22qDS患者的细胞显示I型IFN反应升高,与DGCR8水平相反相关.
结论:
- 通过在富含TE的mRNA中分解dRNA结构,DGCR8抑制了I型IFN反应.
- 如果无法控制内源性TE-dsRNA积累,就会导致不必要的免疫激活.
- 这种DGCR8介导的法规对于预防包括22qDS在内的免疫相关疾病至关重要.
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