结合性免疫缺陷是由ZAP70C终端SH2域中的致病变体引起的
Cédric Mongellaz1, Rita Vicente1, Lenora M Noroski2
1Institut de Génétique Moléculaire de Montpellier, University of Montpellier, Centre National de la Recherche Scientifique (CNRS), Montpellier, France.
Frontiers in immunology
|June 14, 2023
概括
在ZAP-70基因的突变导致联合免疫缺陷. 这项研究发现,ZAP-70的SH2-C域中的突变会损害T细胞受体信号传递,导致严重的免疫缺陷和CD8淋巴缺血症.
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:
- ZAP-70 (zeta链相关蛋白激酶70 kDa) 对于T细胞受体 (TCR) 信号传递至关重要.
- ZAP-70基因的突变导致联合免疫缺陷 (CID),其特征是CD8+T细胞缺乏和非功能CD4+T细胞.
- 与酶域突变相比,对ZAP-70调节TCR招募的SH2域突变的作用不太了解.
研究的目的:
- 研究ZAP-70 SH2域突变对TCR信号传递和T细胞功能的影响.
- 在患有CD8淋巴缺血和联合免疫缺陷的患者中描述ZAP-70新型突变.
- 阐明特定ZAP-70 SH2-C域变异的结构和功能后果.
主要方法:
- 为ZAP-70突变开发了一种高分辨率的化选试验.
- 对四名患有CD8淋巴缺血症的患者进行了基因分析.
- 进行生物化学测定,功能分析和蛋白质建模,以评估SH2域突变的影响.
主要成果:
- 在患有严重综合免疫缺陷的婴儿中,ZAP-70 SH2-C域中发现了一种新型的同卵性突变 (p.R170C).
- R170C突变损害了ZAP-70与TCR-ζ的结合,减少了TCR诱导的酸化,并取消了T细胞的增殖.
- 证实了SH2-C域突变的致病性,包括R170C和R192W,突出了它们在TCR-ζ结合和免疫信号传递中的关键作用.
结论:
- 在ZAP-70 SH2-C域中的有害突变显著减弱了ZAP-70的功能.
- 这些突变导致联合免疫缺陷的临床表现,包括CD8淋巴缺陷症.
- 了解SH2域突变对于诊断和潜在治疗ZAP-70相关免疫缺陷至关重要.
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