在SARS-CoV-2尖端糖蛋白驱动抗体逃生中的反复删除
Kevin R McCarthy1,2,3, Linda J Rennick4,2, Sham Nambulli4,2
1Center for Vaccine Research, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA. krm@pitt.edu pduprex@pitt.edu.
概括
在SARS-CoV-2尖端蛋白中经常发生的删除有助于病毒逃避免疫反应. 这些删除加速病毒的进化和适应,有助于传播有关新血统.
科学领域:
- 病毒学
- 免疫学
- 进化生物学
背景情况:
- 当动物病毒感染人类群体时,会出现动物性流行病,比如严重急性呼吸道综合征冠状病毒2 (SARS-CoV-2) 引起的流行病.
- 病毒适应人类宿主, 进化出逃避免疫系统压力的机制.
- 与其他RNA病毒相比,冠状病毒的替代率较慢.
研究的目的:
- 研究冠状病毒,特别是SARS-CoV-2如何克服其缓慢的替代率.
- 确定推动SARS-CoV-2病毒适应和免疫逃避的机制.
- 了解SARS-CoV-2的尖端糖蛋白中删除的作用.
主要方法:
- 对病毒遗传序列进行分析,以确定尖端糖蛋白中的反复删除.
- 将删除映射到抗体表位和反复删除区域 (RDR).
- 评估全球SARS-CoV-2谱系中删除变体的传播效率和流行率.
主要成果:
- 发现SARS-CoV-2尖端糖蛋白中的反复删除可以抵消病毒的缓慢替代率.
- 这些删除变体在多样化的群体中出现,有效地传播,并且在全球显著的血统中发现.
- 与抗体表位相对应的RDR中的删除赋予了对中和抗体的耐药性.
结论:
- 在SARS-CoV-2尖端糖蛋白中删除似乎加速了抗原进化.
- 这些删除可能在推动SARS-CoV-2的适应性进化方面发挥更广泛的作用.
- 了解这些删除机制对于管理病毒演变和流行病威胁至关重要.
更多相关视频
14:23A Restriction Enzyme Based Cloning Method to Assess the In vitro Replication Capacity of HIV-1 Subtype C Gag-MJ4 Chimeric Viruses
Published on: August 31, 2014
15.9K
08:07Author Spotlight: Advancing Antiviral Strategies Through Novel Immunocapture and Mass Spectrometry Techniques
Published on: January 12, 2024
1.0K
相关概念视频
Viral Mutations
37.5K
A mutation is a change in the sequence of bases of DNA or RNA in a genome. Some mutations occur during replication of the genome due to errors made by the polymerase enzymes that replicate DNA or RNA. Unlike DNA polymerase, RNA polymerase is prone to errors because it is not capable of “proofreading” its work. Viruses with RNA-based genomes, like HIV, therefore accrue mutations faster than viruses with DNA-based genomes. Because mutation and recombination provide the raw material...
37.5K
Leaky Scanning
5.4K
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...
5.4K
Single Nucleotide Polymorphisms-SNPs
17.3K
A single nucleotide polymorphism or SNP is a single nucleotide variation at a specific genomic position in a large population. It is the most prevalent type of sequence variation found in the human genome. Point mutations that occur in more than 1% of the population qualify as SNPs. These are present once every 1000 nucleotides on an average in the human genome. Replacement of a purine with another purine (A/G) or a pyrimidine with another pyrimidine (C/T) is known as a transition. In contrast,...
17.3K
Conjugated Proteins
23.9K
Simple proteins and protein complexes contain only amino acids. In contrast, many other proteins, called conjugated proteins, covalently bond with non-protein moieties.
Nucleoproteins are protein complexes that contain nucleic acids, categorized as deoxyribonucleoproteins (DNPs) or ribonucleoproteins (RNPs) respectively. The nucleosome is a typical example of a DNP where nuclear DNA is associated with histone proteins. The major antigen for the Covid-19 virus SARS-CoV is an RNP that is critical...
Nucleoproteins are protein complexes that contain nucleic acids, categorized as deoxyribonucleoproteins (DNPs) or ribonucleoproteins (RNPs) respectively. The nucleosome is a typical example of a DNP where nuclear DNA is associated with histone proteins. The major antigen for the Covid-19 virus SARS-CoV is an RNP that is critical...
23.9K
Viral Recombination
24.4K
Cells are sometimes infected by more than one virus at once. When two viruses disassemble to expose their genomes for replication in the same cell, similar regions of their genomes can pair together and exchange sequences in a process called recombination. Alternatively, viruses with segmented genomes can swap segments in a process called reassortment.
24.4K
