宿主类型形成岛屿生态系统中的病毒传播网络
Rebecca K French1, Sandra H Anderson2, Kristal E Cain2
1Sydney Institute for Infectious Diseases, School of Medical Sciences, The University of Sydney, Sydney, New South Wales, Australia. Rebecca.french@otago.ac.nz.
Nature ecology & evolution
|September 7, 2023
概括
基因关系,而不是宿主生态,主要影响病毒传播和疾病出现风险. 高度连接的病毒宿主网络增加了跨物种的传播,一般性病毒构成了最大的威胁.
科学领域:
- 生态生态学 生态生态学
- 病毒学 病毒学
- 进化生物学 进化生物学
背景情况:
- 病毒在物种之间传播是疾病出现的关键驱动力.
- 宿主类型和生态相互作用影响病毒的传播和动物感染潜力.
研究的目的:
- 研究宿主类型和生态如何影响病毒多样性和进化.
- 通过食物网连接的孤立岛屿生态系统中的病毒组结构的特征.
主要方法:
- 在新西兰菲奥德兰的各种宿主物种中分析病毒组合.
- 检查宿主遗传关系和生态因素 (掠食者-猎物,饮食).
- 病毒与宿主相互作用的网络分析,以确定社区结构.
主要成果:
- 在族群和较低的分类学层面上的家族遗传障碍显著抑制了跨物种病毒的传播.
- 主体生态,包括捕食者与猎物的关系和饮食,对病毒组合的影响有限.
- 观察到一个"小世界"的网络结构,其中富含病毒的宿主获得了更多的病毒,而通用病毒感染了更多的物种.
- 高度连接的社区增加了跨物种的传播,特别是在相关宿主之间.
结论:
- 宿主基因是病毒传播模式的强大决定因素,而不是宿主生态.
- 在相互连接的宿主群体内存在的通用性病毒对疾病出现的风险很大.
- 了解这些动态对于预测和减轻动物传染病威胁至关重要.
相关概念视频
Size and Structure of Viral Genomes
58
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...
58
Phylogeny
44.3K
Phylogeny is concerned with the evolutionary diversification of organisms or groups of organisms. A group of organisms with a name is called a taxon (singular). Taxa (plural) can span different levels of the evolutionary hierarchy. For instance, the group containing all birds is a taxon (comprising the class Aves), and the group of all species of daisies (the genus Bellis) is a taxon. Phylogenies can likewise include just one genus (i.e., depict species relationships) or span an entire kingdom.
44.3K
Phylogenetic Trees
45.4K
Phylogenetic trees come in many forms. It matters in which sequence the organisms are arranged from the bottom to the top of the tree, but the branches can rotate at their nodes without altering the information. The lines connecting individual nodes can be straight, angled, or even curved.
45.4K
Horizontal Gene Transfer
39
Horizontal gene transfer (HGT) is a process where genetic material moves between organisms within the same generation, unlike vertical gene transfer, which occurs from parent to offspring. HGT plays a crucial role in microbial evolution, adaptation, and survival, particularly in shared environments like the human gut.Mobile genetic elements such as plasmids, prophages, integrons, insertion sequences, and transposons facilitate this process. HGT occurs through three primary mechanisms:...
39
Mutation, Gene Flow, and Genetic Drift
58.5K
In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).
58.5K
Viral Recombination
23.5K
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.
23.5K


