相关实验视频

Updated: May 9, 2025

Isolation of Fidelity Variants of RNA Viruses and Characterization of Virus Mutation Frequency

Isolation of Fidelity Variants of RNA Viruses and Characterization of Virus Mutation Frequency

Published on: June 16, 2011

一个单一的VP2突变是负责新型变体和非常毒的IBDV菌株之间的致命性和抗原性差异

Nan Jiang^1,2, Guodong Wang^1,2, Wenying Zhang^1,2

¹Avian Immunosuppressive Diseases Division, State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, No. 678 Haping Road, Xiangfang District, Harbin, Heilongjiang 150069, China.

Transboundary and emerging diseases

|April 30, 2025

概括

传染病病毒 (IBDV) 的进化是由VP2蛋白质变化驱动的. 新型IBDV的特定突变 (D279N) 降低了致命性和疫苗逃逸,影响家禽的健康.

科学领域:

* 病毒学病毒学
* 免疫学免疫学
* 禽类疾病

背景情况:

* 传染性病 (IBD) 在全球家禽行业造成重大经济损失.
*非常毒的IBDV (vvIBDV) 和新型IBDV (nVarIBDV) 是东亚的主导菌株.
* 与致命的vvIBDV相比,nVarIBDV表现出潜伏的致病性和部分疫苗逃脱.

研究的目的:

* 阐明nVarIBDV和vvIBDV之间致病性和抗原性差异背后的分子机制.
* 为了确定对nVarIBDV.的适应性生存策略作出贡献的关键病毒因素.
* 了解VP2蛋白在IBDV毒性和免疫逃避中的作用.

主要方法:

*局部定向的突变发生引入vvIBDV.中的D279N替代.
*在身上进行体内致病性测定,以评估致死率和病毒载量.
* 测量免疫器官和血液中的炎症因素.
*抗原-抗体结合测试以评估中和能力.

主要成果:

* 在nVarIBDV和vvIBDV之间的致病性差异中,VP2蛋白的残留279是关键的.
*在vvIBDV中使用D279N替代剂,使死亡率从70%降至0%.
*这种替代导致病毒载量降低和炎症性细胞因子水平.
*D279N替代损害了nVarIBDV的vvIBDV抗血清中和,通过影响抗体与抗原的结合.

结论:

* nVarIBDV采用了一种生存策略,包括降低病原性和免疫逃避.
*VP2中的D279N替代是这些适应性特征的关键分子决定因素.
* 结果提供了对病毒演变,病原和IBDV控制策略的见解.

更多相关视频

Using Reverse Genetics to Manipulate the NSs Gene of the Rift Valley Fever Virus MP-12 Strain to Improve Vaccine Safety and Efficacy

Using Reverse Genetics to Manipulate the NSs Gene of the Rift Valley Fever Virus MP-12 Strain to Improve Vaccine Safety and Efficacy

Published on: November 1, 2011

A Simple and Efficient Approach to Construct Mutant Vaccinia Virus Vectors

A Simple and Efficient Approach to Construct Mutant Vaccinia Virus Vectors

Published on: October 30, 2016

相关概念视频

Leaky Scanning

Leaky Scanning

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...

Viral Mutations

Viral Mutations

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...