SARS-CoV-2 Omicron EG.5.1 变种的病毒学特征
Shuhei Tsujino1, Sayaka Deguchi2, Tomo Nomai3
1Department of Microbiology and Immunology, Faculty of Medicine, Hokkaido University, Sapporo, Japan.
Microbiology and immunology
|July 4, 2024
概括
由于关键突变,SARS-CoV-2 EG.5.1 变种,Omicron XBB 的亚系,显示病毒适应性增加. 它的病毒学特征与XBB.1.5相似,尽管有结构上的差异.
科学领域:
- 病毒学 病毒学
- 流行病学 流行病学
- 分子生物学分子生物学
背景情况:
- 一种SARS-CoV-2 Omicron XBB亚系,EG.5.1,在2023年全球出现.
- EG.5.1是XBB.1.9.2的后代,在全球迅速传播.
研究的目的:
- 调查新出现的SARS-CoV-2 EG.5.1变种的病毒学特征.
- 了解导致病毒适应性和传播增加的进化特征.
主要方法:
- 遗传学分析和流行病动态建模.
- 用伪病毒,临床分离物和细胞培养和动物模型中的重组病毒进行感染实验.
- 使用冷电子显微镜评估病毒生长动力学,抗病毒敏感性,融合性,致病性和结构分析.
主要成果:
- 遗传学和建模数据确定S:F456L和ORF9b:I5T是EG.5.1增强病毒适应性的关键替代物.
- 实验数据表明EG.5.1的病毒学特征与XBB.1.5.5.1相似.
- 低温电子显微镜揭示了EG.5.1和XBB.1.5之间尖端蛋白的结构差异;ORF9b:I5T突变的影响在实验中可以忽略不计.
结论:
- 这项研究提供了对新出现的SARS-CoV-2变种,如EG.5.1.1,进化机制的见解.
- 关键突变有助于增加EG.5.1.1.的适应性和传播.
- EG.5.1与XBB.1.5具有相似的病毒学特征,需要持续监测.
相关概念视频
Viral Structure
62.1K
Viruses are extraordinarily diverse in shape and size, but they all have several structural features in common. All viruses have a core that contains a DNA- or RNA-based genome. The core is surrounded by a protective coat of proteins called the capsid. The capsid is composed of subunits called capsomeres. The capsid and genome-containing core are together known as the nucleocapsid.
62.1K
Viral Mutations
32.2K
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...
32.2K
Viral Recombination
23.4K
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.
23.4K
Retroviruses
12.2K
Retroviruses and retrotransposons both insert copies of their genetic elements into the genome of the host cell. Thus, the viral genes are passed on when the host genome is replicated or translated. A typical retroviral DNA sequence contains 3-4 genes that encode the different proteins required for its structural assembly and function as a molecular parasite. This DNA is transcribed into a single mRNA, which is very similar in structure to conventional mRNAs, i.e., it is capped at the 5’...
12.2K
Single Nucleotide Polymorphisms-SNPs
15.0K
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,...
15.0K
What are Viruses?
114.7K
Overview
114.7K


