在COPA的C端域中发生的异合体突变是复杂的自身炎症综合征的基础
Selket Delafontaine1,2, Alberto Iannuzzo3, Tarin M Bigley4
1Laboratory for Inborn Errors of Immunity, Department of Microbiology, Immunology and Transplantation, KU Leuven, Leuven, Belgium.
The Journal of clinical investigation
|January 4, 2024
概括
在COPA的C端域中的突变通过破坏外套蛋白质复合物I (COPI) 功能,导致自身炎症和自身免疫. 这导致ER压力,细胞内流通受损,I型干扰素信号增加.
科学领域:
- 遗传学 是一个遗传学.
- 免疫学 免疫学 免疫学
- 细胞生物学 细胞生物学
背景情况:
- 已知协同体蛋白质复合体α子单元 (COPA) 的N端WD40域中的突变会导致I型干扰性病变.
- 对于子蛋白综合体I (COPI) 的完整性和功能来说,COPA是必不可少的,它调解细胞内贩运.
研究的目的:
- 研究COPA中C端域 (CTD) 突变的作用.
- 阐明CTDCOPA突变引起的自身炎症和自身免疫的分子机制.
主要方法:
- 在受影响儿童中,描述了COPA的CTD (p.C1013S,p.R1058C和p.R1142X) 中的异构基因突变.
- 在患者衍生纤维细胞和细胞系中分析了COPI功能,细胞内贩运 (ER-to-Golgi和Golgi-to-ER) 和信号通路 (cGAS/STING,ER压力,NF-κB).
主要成果:
- 在3个家庭的6名儿童中鉴定了3种CTDCOPA突变,这些儿童有自身炎症和自身免疫.
- 证明CTD COPA突变破坏COPI的完整性和功能,导致前进和逆向的贩运缺陷.
- 显示COPI功能障碍通过cGAS/STING依赖途径调节I型干扰素信号,并激活ER压力和NF-κB信号.
结论:
- COPA CTD的完整性对于COPI功能,细胞内贩运和ER平衡至关重要.
- CTD COPA 突变通过增加 ER 压力,干扰细胞内运输和增强的促炎信号引起疾病.
- 这些发现扩大了对COPA相关疾病和I型干扰症的理解.
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