相关实验视频
Updated: May 16, 2025

08:57
Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin
Published on: August 14, 2018
15.8K
从线粒体基因组学推断的Tettigoniidae (Orthoptera) 的进化史和分歧时间
Tianyou Zhao1, Zhenbin Lin1, Hailin Yang2
1Department of Entomology and MOA Key Lab of Pest Monitoring and Green Management College of Plant Protection, China Agricultural University, Beijing, China.
Frontiers in genetics
|April 4, 2025
概括
对两种虫类物种的线粒体基因组分析揭示了进化关系和分歧时间. 这项研究增强了我们对Tettigoniidae家族进化的理解,起源于早期的古世.
科学领域:
- 进化生物学 进化生物学
- 基因组学就是基因组学.
- 人类遗传学 是一个学科.
背景情况:
- 高通量测序加速了对线粒体基因组 (线粒体基因组) 的研究.
- 线粒体基因组学是理解动物进化历史的关键工具.
- 泰蒂戈尼科家族 (猫科动物) 为进化研究提供了机会.
研究的目的:
- 组装和注释 *Letana rubescens* 和 *Isopsera denticulata* 的线粒基因组.
- 为了重建Tettigoniidae家族内的遗传关系.
- 分析线粒体基因的选择性压力和进化速率.
主要方法:
- 高通量测序用于线粒基因组组装和注释.
- 使用13个蛋白质编码基因 (PCG) 和2个核糖体RNA (rRNA) 基因进行了家族遗传学重建.
- 用概率映射,信号噪声比 (SNR) 和和分析评估的基因推断的稳定性.
主要成果:
- 选择性压力分析在*ND1*和*COX1*中发现了积极的选择部位,整体的负选择表明保持遗传完整性.
- 平均对对身份分析评估了五个主要子家族的进化速率.
- 遗传学分析提供了精确的洞察力,以多个分类层面的Tettigoniidae关系.
结论:
- 该研究估计,使用化石校准,katydids的起源可以追溯到早期的旧世 (~60.86万年前).
- 确定了五个主要的Tettigoniidae亚家族的分离时间.
- 线粒体基因组数据显著改进了对虫类生物进化历史的理解.
相关概念视频
Evolutionary Relationships through Genome Comparisons
5.6K
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...
5.6K
Phylogenetic Trees
44.9K
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.
44.9K
Gene Evolution - Fast or Slow?
7.0K
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...
7.0K
Phylogeny
43.4K
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.
43.4K
Synteny and Evolution
3.2K
John H. Renwick first coined the term “synteny” in 1971, which refers to the genes present on the same chromosomes, even if they are not genetically linked. The species with common ancestry tend to show conserved syntenic regions. Therefore, the concept of synteny is nowadays used to describe the evolutionary relationship between species.
Around 80 million years ago, the human and mice lineages diverged from the common ancestor. During the course of evolution, the ancestral...
Around 80 million years ago, the human and mice lineages diverged from the common ancestor. During the course of evolution, the ancestral...
3.2K
Convergent Evolution
27.2K
Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.
27.2K

