艾滋病毒-1病毒性的遗传结构
François Blanquart1, Chris Wymant2,3, Matthew Hall2,3
1Center for Interdisciplinary Research in Biology, CNRS, Collège de France, PSL Research University, 11 place Marcelin Berthelot, Paris 75231, France.
Virus evolution
|December 10, 2025
概括
人类免疫缺陷病毒-1 (HIV-1) 遗传变异显著影响病毒载荷设定点 (SPVL). 确定了两个HLA脱离突变,突出了它们在HIV病原和病毒性中的作用.
科学领域:
- 病毒学 病毒学
- 遗传学 是一个遗传学.
- 免疫学 免疫学 免疫学
背景情况:
- 人类免疫缺陷病毒-1 (HIV-1) 的毒性受到遗传变异的影响.
- 识别影响HIV-1病原和毒性的特定遗传变异至关重要.
- 以前的研究已经确定了影响HIV-1病毒性的有限遗传变异.
研究的目的:
- 为了识别影响病毒性表型的HIV-1内遗传变异,特别是设定点病毒载量 (SPVL) 和CD4细胞计数下降率.
- 开发和应用一种新的全基因组关联研究 (GWAS) 方法来分析复杂的病毒遗传变异.
- 研究病毒遗传变异在HIV-1病原和演变中的作用.
主要方法:
- 来自欧洲国家2294个血清转换器的全基因组HIV序列数据使用一种新的GWAS方法进行了分析.
- 在GWAS方法中,纳入了对人口结构的修正,考虑了多个等位基因,并测试了各种遗传变异 (SNP,k-mers,indels等). ) 的情况.
- 评估了两个表型:设定点病毒载量 (SPVL) 和CD4细胞计数下降率. 试图在独立的数据集中进行复制.
主要成果:
- 病毒基因组解释了SPVL26%的变异,但只有CD4细胞计数下降率的变异0.9%.
- 确定了两个重要的SPVL相关变异:一个HLA-B*57逃生突变 (减少SPVL) 和一个HLA-B*35逃生突变 (增加SPVL).
- 这些发现在独立数据集中的复制产生了混合的结果,表明宿主依赖的效应.
结论:
- 艾滋病毒-1SPVL在很大程度上是可遗传的,并受到病毒基因组的影响,特别是通过HLA逃脱变体.
- 这些变种可以对病毒载量产生实质性的宿主依赖性影响,这些病毒载量可能无法在不同种群中一致检测到.
- 这些发现强调了病毒遗传学和宿主免疫力之间的复杂相互作用,用于确定HIV-1病原体.
相关概念视频
Size and Structure of Viral Genomes
622
Viral genomes exhibit remarkable diversity in size, structure, and composition, influencing their replication strategies and interactions with host cells. These genomes consist of either DNA or RNA and may be linear or circular. Additionally, they can be single-stranded or double-stranded, with each configuration affecting how the virus propagates within a host. RNA viruses, for instance, generally have smaller genomes than DNA viruses, a factor that contributes to their high mutation rates and...
622
Viral Mutations
39.5K
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...
39.5K
Retroviruses
14.5K
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’...
14.5K
Mechanisms of Retrovirus-induced Cancers
6.8K
Retroviruses are RNA viruses that have been shown to cause cancers in diverse species, including chickens, mice, cats, and monkeys. The RNA genomes of these viruses are first reverse-transcribed into single and then double-stranded DNA (dsDNA) copies. This dsDNA called proviral DNA then integrates into the host genome. Subsequently, the host cell transcribes the proviral DNA in concert with the chromosomal DNA. This leads to the production of viral RNA and proteins that assemble at the host...
6.8K
Retrovirus Life Cycles
49.1K
Retroviruses have a single-stranded RNA genome that undergoes a special form of replication. Once the retrovirus has entered the host cell, an enzyme called reverse transcriptase synthesizes double-stranded DNA from the retroviral RNA genome. This DNA copy of the genome is then integrated into the host’s genome inside the nucleus via an enzyme called integrase. Consequently, the retroviral genome is transcribed into RNA whenever the host’s genome is transcribed, allowing the...
49.1K
Rous Sarcoma Virus (RSV) and Cancer
6.1K
Rous Sarcoma virus or RSV was discovered by F. Peyton Rous in the year 1911 as a filterable transmissible agent that could cause tumors in chickens. He won a Nobel Prize for this discovery in 1966. His experiments clearly demonstrated that some cancers could be caused by infectious agents and led to the discovery of many more cancer-causing viruses in animals as well as humans.
RSV is a retrovirus that contains two copies of a plus-strand RNA genome. Its genome consists of four main open...
RSV is a retrovirus that contains two copies of a plus-strand RNA genome. Its genome consists of four main open...
6.1K


