相关实验视频
Updated: Jun 20, 2025
08:57
Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin
Published on: August 14, 2018
15.9K
最后一个普遍共同祖先的未完成的重建性质
1Departamento de Ingeniería Genética, Cinvestav Unidad Irapuato, Km 9.6 Libramiento Norte Carretera Irapuato-León CP. 36824, Irapuato, Gto., Mexico. luis.delaye@cinvestav.mx.
Journal of molecular evolution
|July 18, 2024
概括
探索最后的普世共同祖先 (LUCA) 揭示了关于其复杂性的持续辩论. 不同的方法可以识别独特的古代蛋白质,突出了对早期生命的专用数据库的需求.
科学领域:
- 进化生物学 进化生物学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 达尔文的共同起源理论认为,所有生命都有一个共同的祖先.
- 生物化学和分子生物学证实了现存生命形式之间的共同祖先.
- 最后的普遍共同祖先 (LUCA) 的确切性质和复杂性仍在争论中.
研究的目的:
- 为了提供一个历史概述,试图推断LUCA的特征.
- 检查围绕LUCA推断性质的复杂性和辩论.
- 讨论不同的方法如何产生部分重叠的古代蛋白质集.
主要方法:
- 对历史上试图描述LUCA的历史尝试的回顾.
- 对识别古老蛋白质子单元 (例如ATP合成酶) 的生物信息学方法的分析.
- 对特定基因的分子进化分析,如反向旋转酶.
主要成果:
- 不同的方法识别了不同的,虽然部分重叠,可能从LUCA遗传的蛋白质集.
- 反向旋转酶的分子进化分析已经挑战了以前关于超热友好型LUCA的假设,这些假设仅来自生物信息管道.
- 通过整合各种分析方法,对LUCA的复杂性和环境的推断得到了改进.
结论:
- 了解LUCA需要整合自动化生物信息分析之外的多种证据线.
- 对古代蛋白质和基因的研究对于重建早期生命至关重要.
- 一个专门的基因和蛋白质数据库可追溯到LUCA和早期的进化阶段对于未来的研究至关重要.
相关概念视频
02:35What is Evolutionary History?
36.4K
Scientists record evolutionary history by analyzing fossil, morphological, and genetic data. The fossil record documents the history of life on Earth and provides evidence for evolution. However, both fossil and living organisms offer evidence that outlines Earth’s evolutionary history.
36.4K
01:23Phylogeny
43.8K
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.
43.8K
02:31Synteny 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
01:24Eukaryotic Evolution
33.3K
The endosymbiont theory is the most widely accepted theory of eukaryotic evolution; however, its progression is still somewhat debated. According to the nucleus-first hypothesis, the ancestral prokaryote first evolved a membrane to enclose DNA and form the nucleus. Conversely, the mitochondria-first hypothesis suggests that the nucleus was formed after endosymbiosis of mitochondria.
Contrary to the endosymbiont theory, the eukaryote-first hypothesis proposes that the simpler prokaryotic and...
Contrary to the endosymbiont theory, the eukaryote-first hypothesis proposes that the simpler prokaryotic and...
33.3K
03:21Phylogenetic Trees
45.3K
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.
45.3K
02:40The Tree of Life - Bacteria, Archaea, Eukaryotes
32.3K
The “tree of life” describes the evolution of life and the evolutionary relationships between organisms. The root of the tree is the common ancestor to all life on Earth. All other species radiate from this point, much like the branches of a tree. The numerous tips of these branches on the tree of life represent every living, or extant, species. Extinct species, which are species that no longer exist, can be found towards the center of the tree. Currently, these organisms, both...
32.3K