与Cryptococcus neoformans序列类型93的病毒性相关变异与独立的罕见突变相比,与人口结构相关的可能性较小
Katrina M Jackson1,2, Kisakye Diana Kabbale3,4, Marissa Macchietto5
1Department of Microbiology and Immunology, University of Minnesota, Minneapolis, Minnesota, USA.
Microbiology spectrum
|November 27, 2024
概括
这项研究揭示了Cryptococcus neoformans亚种群中的遗传变异 (SNP) 有关,影响病毒性. 与病毒性相关的突变似乎在感染期间独立出现,而不是通过长期进化.
科学领域:
- 微生物学 微生物学
- 遗传学 遗传学 是一个
- 进化生物学 进化生物学
背景情况:
- 新型菌 (Cryptococcus neoformans) 引起密码球菌脑膜炎,这是一个严重的感染.
- 新型菌的遗传构成会影响患者的治疗结果,但其机制尚不清楚.
- 环境C. neoformans分离物往往具有毒性,尽管与毒性菌株有遗传相似性.
研究的目的:
- 为了研究两种C. neoformans亚种群ST93A和ST93B之间的进化关系.
- 了解单核酸多态 (SNPs) 和链接不平衡 (LD) 在C. neoformans毒性的作用.
- 为了解与C. neoformans病毒性相关的突变提供一个进化框架.
主要方法:
- 对SNP之间的链接不平衡 (LD) 的分析,以区分ST93A和ST93B.
- 在ST93A和ST93B亚群中比较LD程度.
- 使用轮紧固凝电泳和长读测序的型分析.
主要成果:
- 在区分ST93A和ST93B的SNP之间观察到广泛的LD.
- 与ST93A.相比,ST93B亚种群中的LD更为明显.
- 与毒性相关的SNP显示较少的远程LD频率,更有可能是独立的突变.
结论:
- C. neoformans ST93亚种群的分化是由SNP在链接不平衡中驱动的.
- 在C. neoformans中,与病毒性相关的突变可能在感染期间独立出现,而不是通过长期进化过程积累.
- 在感染期间识别容易发生独立突变的基因对于理解C. neoformans的毒性至关重要.
相关概念视频
Viral Mutations
32.2K
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...
32.2K
Comparing Copy Number Variations and SNPs
17.3K
Sequencing of the human genome has opened up several best-kept secrets of the genome. Scientists have identified thousands of genome variations that exist within a population. These variations can be a single nucleotide or a larger chromosomal variation.
Copy number variations or CNVs are the structural variations that cover more than 1kb of DNA sequence. The single nucleotide polymorphism (SNP), on the other hand, is a single nucleotide change or a point mutation that is found in more than 1%...
Copy number variations or CNVs are the structural variations that cover more than 1kb of DNA sequence. The single nucleotide polymorphism (SNP), on the other hand, is a single nucleotide change or a point mutation that is found in more than 1%...
17.3K
Viral Recombination
23.3K
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.
23.3K
Viruses of Archaea
Archaeal viruses play a crucial role in the ecosystems of extremophilic archaea, particularly those belonging to the phyla Euryarchaeota and Crenarchaeota. By shaping host evolution and facilitating gene transfer, these viruses influence microbial communities and contribute to genetic diversity in extreme environments. The archaea they infect thrive in acidic hot springs and hydrothermal vents characterized by high temperatures and low pH. Archaeal viruses exhibit remarkable structural...
Evolutionary Relationships through Genome Comparisons
5.7K
Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
5.7K
Single Nucleotide Polymorphisms-SNPs
14.0K
A single nucleotide polymorphism or SNP is a single nucleotide variation at a specific genomic position in a large population. It is the most prevalent type of sequence variation found in the human genome. Point mutations that occur in more than 1% of the population qualify as SNPs. These are present once every 1000 nucleotides on an average in the human genome. Replacement of a purine with another purine (A/G) or a pyrimidine with another pyrimidine (C/T) is known as a transition. In contrast,...
14.0K


