增加的SARS-CoV-2 BQ和XBB亚型的令人担忧的抗体逃避特性
Qian Wang1, Sho Iketani1, Zhiteng Li1
1Aaron Diamond AIDS Research Center, Columbia University Vagelos College of Physicians and Surgeons, New York, NY, USA.
Cell
|December 29, 2022
概括
新的SARS-CoV-2亚型BQ和XBB显示出显著的抗体逃避. 目前的COVID-19疫苗和授权的单克隆抗体对这些变种的有效性较低,引发了公众健康的担忧.
科学领域:
- 病毒学
- 免疫学
- 传染性疾病
背景情况:
- SARS-CoV-2 Omicron 变种已经迅速演变,导致了新的亚变种的出现.
- BQ和XBB亚型具有额外的尖端突变,可能提高它们逃避免疫反应的能力.
研究的目的:
- 评估血清和单克隆抗体对SARS-CoV-2 BQ和XBB亚型的中和效果.
- 鉴定这些亚变种对免疫规避性质负责的特定突变.
主要方法:
- 使用疫苗和感染者的血清进行中和测定,包括用双价mRNA疫苗增强的血清.
- 对BQ和XBB亚型的单克隆抗体的评估.
- 对ACE2结合 afinities 的分析.
主要成果:
- 人类血清和双价疫苗增强剂对BQ和XBB亚变体的中和显著受损.
- 与之前的Omicron变种相比,对这些亚变种的抗体标位显著降低 (13至155倍).
- 大多数授权的单克隆抗体对BQ和XBB亚型无活性.
- 确定了导致免疫逃避的特定突变.
- BQ和XBB亚型表现出与前者相似的ACE2结合亲缘关系.
结论:
- BQ和XBB亚型对目前的COVID-19疫苗的有效性构成重大威胁.
- 现有的授权单克隆抗体在很大程度上对这些新出现的亚变体无效.
- BQ和XBB亚型的免疫逃避优势可能有助于它们的种群主导地位.
相关概念视频
Cross-reactivity
31.4K
Overview
31.4K
Leaky Scanning
5.2K
During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA. Marilyn Kozak discovered that the sequence RCCAUGG (where R...
5.2K
Antibody Actions
1.2K
Antibodies, or immunoglobulins, are critical players in the immune system's arsenal against invading pathogens. Produced by B cells and plasma cells, their primary role is to detect and bind to specific antigens, molecules found on the surface of pathogens like bacteria or viruses. Beyond antigen recognition, antibodies perform several vital functions that contribute to immune defense.
Neutralization
Antibodies can bind to pathogens, preventing them from infecting host cells. This process...
Neutralization
Antibodies can bind to pathogens, preventing them from infecting host cells. This process...
1.2K
Defense Against Bacterial Pathogens
1.5K
The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
1.5K


