相关实验视频

Updated: Jan 10, 2026

Experimental Viral Infection in Adult Mosquitoes by Oral Feeding and Microinjection

Experimental Viral Infection in Adult Mosquitoes by Oral Feeding and Microinjection

Published on: July 28, 2022

登革热病毒在宿主之间和宿主内部发生突变

Sachith Maduranga¹, Braulio Mark Valencia², Chathurani Sigera³

¹School of Biomedical Sciences, Faculty of Medicine and Health, University of New South Wales, Sydney, 2052, NSW, Australia; Kirby Institute, University of New South Wales, Sydney, 2052, NSW, Australia.

|November 29, 2025

概括

登革热病毒 (DENV) 基因组显示出高突变率,随着哈普洛型分析揭示了比共识测序更多的突变热点. 这突显了哈普洛型水平分析对于理解急性感染中的病毒演变和多样性的重要性.

科学领域:

病毒学病毒学
基因组学就是基因组学.
分子生物学分子生物学

背景情况:

包括登革热病毒 (DENV) 在内的RNA病毒表现出高突变率,导致宿主内部的准物种.
之前的研究集中在共识序列上,可能忽视了在单元型水平上关键的基因组变异性.

研究的目的:

在DENV基因组中的突变热点在共识和单种型水平上进行表征.
为了比较从共识中获得的见解与急性病毒感染中的哈普洛型测序.

主要方法:

使用牛津纳米孔技术 (ONT) 测序了几乎全长的DENV基因组.
使用Minimap-2生成共识序列;用Nano-Q重建了单元类型.
用香农 (SE) 评估了基因组变异性,使用Datamonkey套件工具 (FEL,MEME,FUBAR) 确定了多样化的选择.

主要成果:

与共识分析相比, Haplotype 分析揭示了更多具有高可变性和多样化选择下的 codon 的地点.
在共识水平上,NS2A显示了最高位 (根据基因长度进行调整);在平分型水平上,NS1显示了最多.
来自斯里兰卡患者的90个DENV基因组 (DENV1,DENV2,DENV3) 已成功进行了鉴定.

结论:

哈普洛型水平的分析对于揭示急性RNA病毒感染中病毒基因组变异的全谱至关重要.
达成共识的分析可能会掩盖病毒群体中存在的显著突变热点和选择性压力.

关键词:

登革热是因为登革热.多样化选择的选择.病毒RNARNA病毒RNA病毒香农 Entropy 香农的是什么意思斯里兰卡斯里兰卡斯里兰卡

更多相关视频

Protocol for Dengue Infections in Mosquitoes A. aegypti and Infection Phenotype Determination

Protocol for Dengue Infections in Mosquitoes A. aegypti and Infection Phenotype Determination

Published on: July 4, 2007

A Murine Model of Dengue Virus-induced Acute Viral Encephalitis-like Disease

A Murine Model of Dengue Virus-induced Acute Viral Encephalitis-like Disease

Published on: April 28, 2019

相关概念视频

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...

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.

Exon Recombination

Exon Recombination

The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes.
Exon shuffling follows “splice frame rules.” Each exon...

Mutations in Microorganisms

Mutations in Microorganisms

Mutations are heritable changes in an organism’s genome involving alterations in the base sequence of DNA or RNA. These changes can influence cellular processes and phenotypic traits, potentially transforming the unaltered wild type into a mutant form. Such changes, termed forward mutations, are pivotal in shaping the genetic diversity of organisms.RNA viruses exhibit the highest mutation rates due to the absence of robust proofreading mechanisms during genome replication. In contrast,...