相关实验视频

Updated: Jun 21, 2025

Rescue and Characterization of Recombinant Virus from a New World Zika Virus Infectious Clone

Rescue and Characterization of Recombinant Virus from a New World Zika Virus Infectious Clone

Published on: June 7, 2017

来自西非的当代寨卡病毒的复制特性

Dana Machmouchi¹, Marie-Pierre Courageot², Chaker El-Kalamouni¹

¹Processus Infectieux en Milieu Insulaire Tropical (PIMIT), Université de La Réunion, INSERM U1187, CNRS 9192, IRD 249, Plateforme Technologique CYROI, Sainte-Clotilde, La Réunion, France.

PLoS neglected tropical diseases

|July 5, 2024

概括

像GUINEA-18这样的非洲寨卡病毒 (ZIKV) 菌株的复制率和免疫激活率低于历史菌株. 非结构性蛋白质,特别是NS4B,是ZIKV复制和抑制宿主细胞应激反应的关键.

科学领域:

病毒学病毒学
分子生物学分子生物学
免疫学免疫学免疫学

背景情况:

寨卡病毒 (ZIKV) 构成了全球健康威胁,亚洲/美国基因型与人类发育障碍有关.
新出现的证据表明,非洲ZIKV菌株可能表现出增加的胎儿致病性,这需要对撒哈拉以南非洲的病毒分离物进行调查.

研究的目的:

为了生成西非ZIKV分离物 (GUINEA-18) 的传染性分子克隆,并将其特性与历史的非洲ZIKV菌株 (MR766MC) 进行比较.
研究ZIKV非结构蛋白 (NS1-NS4B) 在病毒复制,细胞毒性,宿主免疫反应和压力颗粒抑制中的作用.

主要方法:

从西非ZIKV分离物中生成一种传染性分子克隆 (GUINEA-18).
在使用GUINEA-18和MR766MC克隆的VeroE6,A549和HCM3细胞系中进行比较复制和细胞毒性测定.
构建和分析仿真病毒,以识别影响复制和宿主反应的关键病毒蛋白.
评估ZIKV在感染细胞中抑制压力颗粒形成的能力.

主要成果:

与MR766MC克隆相比,GUINEA-18克隆表现出较低的复制率,降低细胞毒性和较弱的先天免疫激活.
化学病毒分析强调了非结构蛋白NS1到NS4B,特别是NS4B在确定GUINEA-18的复制能力方面的重要性.
在A549细胞中,GUINEA-18有效地抑制了压力颗粒的形成,NS1-NS4B蛋白在这个过程中发挥了关键作用.

结论:

与历史菌株相比,非洲ZIKV菌株具有不同的复制和免疫调节策略.
非结构性蛋白质,特别是NS4B,对于ZIKV复制和抑制宿主细胞应激反应至关重要.
需要进一步的研究,以了解这些非结构性蛋白质在当代非洲ZIKV菌株的致病性中的作用.

更多相关视频

Zika Virus Infectious Cell Culture System and the In Vitro Prophylactic Effect of Interferons

Zika Virus Infectious Cell Culture System and the In Vitro Prophylactic Effect of Interferons

Published on: August 23, 2016

Rescue of Recombinant Zika Virus from a Bacterial Artificial Chromosome cDNA Clone

Rescue of Recombinant Zika Virus from a Bacterial Artificial Chromosome cDNA Clone

Published on: June 24, 2019

相关概念视频

Viral Recombination

Viral Recombination

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.

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...