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相关概念视频

The Evidence for Evolution02:55

The Evidence for Evolution

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Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.
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Convergent Evolution01:54

Convergent Evolution

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Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.
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Nuclear Fusion02:45

Nuclear Fusion

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The process of converting very light nuclei into heavier nuclei is also accompanied by the conversion of mass into large amounts of energy, a process called fusion. The principal source of energy in the sun is a net fusion reaction in which four hydrogen nuclei fuse and ultimately produce one helium nucleus and two positrons.
A helium nucleus has a mass that is 0.7% less than that of four hydrogen nuclei; this lost mass is converted into energy during the fusion. This reaction produces about...
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Eukaryotic Evolution01:24

Eukaryotic Evolution

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The endosymbiont theory is the most widely accepted theory of eukaryotic evolution; however, its progression is still somewhat debated. According to the nucleus-first hypothesis, the ancestral prokaryote first evolved a membrane to enclose DNA and form the nucleus. Conversely, the mitochondria-first hypothesis suggests that the nucleus was formed after endosymbiosis of mitochondria.
Contrary to the endosymbiont theory, the eukaryote-first hypothesis proposes that the simpler prokaryotic and...
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Synteny and Evolution02:31

Synteny and Evolution

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John H. Renwick first coined the term “synteny” in 1971, which refers to the genes present on the same chromosomes, even if they are not genetically linked. The species with common ancestry tend to show conserved syntenic regions. Therefore, the concept of synteny is nowadays used to describe the evolutionary relationship between species.
Around 80 million years ago, the human and mice lineages diverged from the common ancestor. During the course of evolution, the ancestral...
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Self-Evaluation: Self-Enhancement and Self-Verification03:00

Self-Evaluation: Self-Enhancement and Self-Verification

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Social psychologists have documented that feeling good about ourselves and maintaining positive self-esteem is a powerful motivator of human behavior (Tavris & Aronson, 2008). In the United States, members of the predominant culture typically think very highly of themselves and view themselves as good people who are above average on many desirable traits (Ehrlinger, Gilovich, & Ross, 2005). Often, our behavior, attitudes, and beliefs are affected when we experience a threat to our...
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相关实验视频

Updated: Jan 29, 2026

Author Spotlight: A Pseudotype Virus System for Assessing Omicron Subvariants and Neutralizing Antibodies in SARS-CoV-2 Research
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Author Spotlight: A Pseudotype Virus System for Assessing Omicron Subvariants and Neutralizing Antibodies in SARS-CoV-2 Research

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随着SARS-CoV-2的进化,增强了内细胞吸收,同时保持了TMPRSS2-依赖的融合.

Clara L Magnus1, Zeliha Hamed Jaber1, Andreas Hiergeist2

  • 1Institute of Clinical Microbiology and Hygiene, University Hospital Regensburg, Regensburg, Germany.

Frontiers in immunology
|January 28, 2026
PubMed
概括

在SARS-CoV-2的Omicron变种中,细胞进入的目的不仅仅是直接融合,而是利用内细胞结合,从而增强上呼吸道的复制和传播能力. 然而,它们保留了融合活性,保持了下呼吸道感染的潜力,对一些人来说构成风险.

关键词:
这就是SARS-CoV-2病毒.冠状病毒冠状病毒的新冠病毒.细胞内分泌症 (endocytosis) 发生在细胞内.进化 演化 演化 演化 演化 演化 演化 演化融合 融合 融合 融合 融合 融合 融合 融合 融合 融合热带主义 热带主义 热带主义关注的变体 - 关注的变体病毒入口病毒入口.

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科学领域:

  • 病毒学 病毒学
  • 分子生物学分子生物学
  • 传染性疾病 传染性疾病

背景情况:

  • 一种令人担忧的SARS-CoV-2变种Omicron表现出增加的传染性和感染性,但降低了病原性.
  • 这种病毒性转变与病毒进入机制的改变有关,有利于内细胞形成而不是直接融合.

研究的目的:

  • 为了比较各种SARS-CoV-2变体的进入机制 (内细胞分裂与直接融合),包括Omicron.
  • 研究特定突变在确定病毒进入途径中的作用.

主要方法:

  • 在四个人类细胞系中分析了九种临床SARS-CoV-2分离物 (野生型,阿尔法,三角形,欧米克朗).
  • 使用TMPRSS2抑制剂 (卡莫斯塔特) 和甲素抑制剂 (阿洛克西斯塔丁) 来区分进入途径.
  • 通过下一代测序确定全长的病毒基因组.

主要成果:

  • 阿尔法和三角形变体主要使用TMPRSS2-依赖的融合.
  • 奥米克朗变体显示出明显的转向内细胞分裂,特别是在特定的细胞类型中.
  • 某些突变 (Δ69/Δ70,L452R,F486V) 与对内细胞吸收的依赖性增加有关.

结论:

  • 奥米克龙变体通过保持融合活性,同时增强内细胞分裂,扩大了它们的细胞热带.
  • 观察到上呼吸道复制和传播能力增加,但下呼吸道感染能力保持不变.
  • 特定的突变组合可能会赋予选择性优势,有助于它们的流行.