新的TLR8和TLR9的替代转录揭示了保护蛋白质结构的进化压力
Jorge Martinez-Laso1, Isabel Cervera1, María José Muñoz-Gómez2
1Immunogenetics Unit. National Center of Microbiology, Instituto de Salud Carlos III, 28220, Madrid, Spain.
Biochimie
|September 7, 2025
概括
收费类受体8和9 (TLR8和TLR9) 是识别病毒威胁的关键. 这项研究确定了新的TLR8和TLR9基因转录,揭示了维护受体功能的进化机制.
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 是一个遗传学.
背景情况:
- 收费类受体 (TLRs) 对天生的免疫非常重要,特别是在识别病毒病原体时.
- TLR8检测病毒RNA,而TLR9识别病毒DNA,启动早期免疫反应.
- 功能障碍的TLR增加了对感染的易感性.
研究的目的:
- 在健康的人群中全面分析TLR8和TLR9基因转录.
- 为了确定TLR8和TLR9的新型替代转录.
- 研究产生mRNA变异的机制及其对受体结构和功能的影响.
主要方法:
- 对TLR8和TLR9基因表达数据的生物信息分析.
- 新型mRNA变异的识别和表征.
- 对转录结构和预测的蛋白质序列进行比较分析.
主要成果:
- 发现了两个新的TLR8转录 (V3,V4) 和四个新的TLR9转录 (V2,V5,V6,V7).
- 已识别的转录生成机制包括外跳转和内保留.
- 氨基酸变化局部存在于N端白丰富的重复 (LRR) 区域,从而保持了整体受体完整性.
- 有证据表明,有强大的进化压力维持TLR8和TLR9功能域.
结论:
- 人类基因组编码的TLR8和TLR9转录的多样性比以前所知的更大.
- 替代拼接机制产生TLR8和TLR9.9的功能变体.
- TLR8和TLR9的保存结构表明,在先天免疫中具有显著的进化重要性.
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