一种新型的同卵性RHOH变异与T细胞功能障碍和反复的机会性感染有关
Jingyu Zhou1, Mengqing Qian1, Ning Jiang1,2,3
1Department of Infectious Diseases, Shanghai Key Laboratory of Infectious Diseases and Biosafety Emergency Response, National Medical Center for Infectious Diseases, Huashan Hospital, Shanghai Medical College, Fudan University, 12 M. Wulumuqi Road, Shanghai, 200040, China.
Journal of clinical immunology
|May 22, 2024
概括
一种新的RHOH基因变异通过损害T细胞功能并增加对机会性感染的易感性,导致严重的免疫缺陷. 这一发现突显了RHOH.
科学领域:
- 免疫学 免疫学 免疫学
- 遗传学 是一个遗传学.
- 细胞生物学 细胞生物学
背景情况:
- 血液细胞中的小GTPaseRHOH对于免疫功能至关重要.
- 低RHOH缺乏与各种疾病有关,包括免疫缺陷.
- 复发性感染表明潜在的原发性免疫缺陷.
研究的目的:
- 在年轻男性中确定反复出现的机会性感染的遗传原因.
- 描述一种新型RHOH变异的功能影响.
- 阐明与RHOH相关的T细胞功能障碍的分子机制.
主要方法:
- 整体外基因组测序以识别遗传变异.
- 流细胞计分析免疫细胞群 (CD4+,B,NK细胞).
- 在体外T细胞激活测定 (TCR刺激,CD69上调).
- 西方涂抹和共同免疫沉以评估蛋白质表达和相互作用 (RHOH,ZAP70).
主要成果:
- 在该患者身上发现了一种新型同卵性RHOH变体 (c.245G>A,p.Cys82Tyr).
- 该患者出现了T,B和NK细胞淋巴缺血和低免疫球蛋白血症.
- 该RHOH (C82Y) 变体影响了T细胞激活和ZAP70相互作用,降低了RHOH蛋白水平.
- RHOH ((C82Y) 作为一个低形态细胞,破坏ZAP70介导的T细胞受体信号传递.
结论:
- 鉴定到的自体递归的RHOH变体导致T细胞功能障碍和反复的机会性感染.
- 这种p.Cys82Tyr变种破坏ZAP70介导的T细胞信号传递,导致免疫缺陷.
- 这一发现扩大了RHOH相关疾病的范围,并为免疫调节提供了洞察力.
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