对环境DNA的分类学赋值来解释遗传学定位
Isabelle Ewers1, Lubomír Rajter1,2, Lucas Czech3
1Eukaryotic Microbiology, Faculty of Biology, University of Duisburg-Essen, Essen, Germany.
The Journal of eukaryotic microbiology
|July 14, 2023
概括
通过比较环境DNA的分类学赋值方法,这项研究发现,操作分类学单位 (OTU) 和参考数据库之间的低相似性解释了对对对齐和基因排列的不同结果. 通过GAPPA进行进一步的分析,对多次安置的任务进行了细化.
科学领域:
- 生物信息学是一种生物信息学.
- 微生物生态学 微生物生态学
- 计算生物学 计算生物学
背景情况:
- 操作分类单位 (OTU) 的准确分类对分析环境测序数据至关重要.
- 配对对齐和族系定位是用于分类学赋值的常见生物信息学方法,但可以产生不同的结果.
研究的目的:
- 用VSEARCH (对对齐) 和EPA-ng (家族遗传定位) 来比较来自森林土壤的科尔波德状动物OTU的分类学分配.
- 在不同生物信息学方法之间出现差异时,评估分类学赋值的方法.
- 使用GAPPA.ng来展示EPA-ng输出的综合分析工作流程.
主要方法:
- 对由VSEARCH和EPA-ng生成的鱼类OTU产生的分类学赋值进行比较分析.
- 基于对比相似性对参考数据库的分类学赋值差异的评估.
- 应用GAPPA来通过考虑多个位置的概率权重和分支距离来完善EPA-ng分配.
主要成果:
- 在分类层层面上对对对齐和族系学定位之间的分类学分配的差异与OTU与参考数据库的低对对相似性相关.
- GAPPA有效地通过量化多个同样可能的位置的概率和系遗传距离来评估分类学赋值.
- 根据其精细的遗传学位置,推断了colpodean OTUs的进化和生态特征.
结论:
- 与参考数据库的低OTU相似性是对对齐和放置方法之间的分类学赋值差异的一个关键因素.
- EPA-ng和GAPPA的结合为准确的分类学分配和下游生态/进化分析提供了一个强大的框架.
- 了解分类特异性多样性对于充分解释分类遗传定位结果至关重要.
相关概念视频
02:54Evolutionary Relationships through Genome Comparisons
5.8K
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...
5.8K
01:20Applications of Molecular Taxonomy
42
Molecular taxonomy has revolutionized the understanding and classification of bacteria, providing precise insights into their diversity, evolutionary relationships, and ecological roles. By utilizing molecular techniques such as DNA sequencing and fingerprinting, researchers have made significant strides in various fields related to bacterial studies.Resolving Taxonomic AmbiguitiesMolecular taxonomy has been instrumental in distinguishing closely related bacterial species initially thought to...
42
01:29Modern Molecular Taxonomy
53
Advancements in molecular biology have revolutionized the identification and characterization of bacteria, with multiple methods leveraging DNA sequencing for enhanced precision. As sequencing technologies improve and costs decline, these approaches are increasingly used in clinical, environmental, and evolutionary studies.Multilocus Sequence Typing (MLST) examines several housekeeping genes, essential chromosomal genes encoding cellular functions, to distinguish strains. Approximately...
53
02:05Gene Evolution - Fast or Slow?
7.2K
The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
In contrast, regions which code...
In contrast, regions which code...
7.2K
03:21Phylogenetic Trees
45.6K
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.
45.6K
01:30Diversity of Archaea I
35
Archaea, a domain of single-celled microorganisms, are classified into five major phyla based on genetic and biochemical characteristics: Euryarchaeota, Crenarchaeota, Thaumarchaeota, Korarchaeota, and Nanoarchaeota. Among these, the phylum Euryarchaeota is notable for its remarkable diversity in morphology, metabolism, and ecological adaptations.Morphological and Metabolic DiversityMembers of Euryarchaeota exhibit a variety of cellular shapes, including rods and cocci. Their metabolic pathways...
35