对SARS-CoV-2尖峰的反向突变扫描BA.2.86识别了有助于免疫脱离多克隆血清的表位
Najat Bdeir1, Tatjana Lüddecke1, Henrike Maaß1
1Department of Viral Immunology, Helmholtz Centre for Infection Research, Braunschweig, Germany.
Nature communications
|January 18, 2025
概括
奥米克朗BA.2.86和JN.1变种显示出显著的免疫逃脱. 反向突变扫描确定了尖端蛋白中的关键突变,导致这种在接种疫苗的个体中逃避抗体.
科学领域:
- 病毒学 病毒学
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
背景情况:
- 拥有超过30个突变的Omicron BA.2.86血统及其JN.1衍生物表现出免疫逃避.
- 之前的研究表明,在完全接种疫苗的个体中,抗体对这些变种的中和性降低了.
研究的目的:
- 确定负责Omicron BA.2.86和JN.1.免疫逃逸的特定表位.
- 了解个体突变对抗体逃避的贡献.
主要方法:
- 产生33个BA.2.86.6.的单基因突变逆转性伪病毒.
- 应用反向突变扫描来量化对每个突变的中和度.
- 在XBB.1.5增剂接种疫苗后对抗体中和的评估.
主要成果:
- 受体结合域 (K356T,V483Δ,N460K,A484K,F486P) 中的突变显著增强了免疫逃生.
- 突变16insMPLF (N终端域) 和P621S (S1/S2) 也对抗体逃逸有很大的贡献.
- 对BA.2.86和JN.1的XBB.1.5强剂接种提高了中和度,其残留逃逸与16insMPLF,N460K,E554K,P621S和A484K有关.
结论:
- 在BA.2.86和JN.1的尖端蛋白中的特定突变是免疫逃逸的关键驱动因素.
- 反向突变扫描是一种有效的方法来绘制病毒免疫逃避的表位图.
- 补充疫苗可以恢复中和,但不能完全废除通过关键突变调解的免疫逃脱.
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