相关实验视频
Updated: May 31, 2025

08:57
Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin
Published on: August 14, 2018
15.8K
CASTER:从全基因组对齐直接推断物种树
Chao Zhang1,2,3, Rasmus Nielsen1,3, Siavash Mirarab4
1Globe Institute, University of Copenhagen, Øster Voldgade 5-7, Copenhagen, Denmark.
概括
正确地推断生命树是因为不一致的基因组历史而具有挑战性. 新的结合意识对齐基于物种树估计器 (CASTER) 方法分析了整个基因组,提高了遗传学准确性.
科学领域:
- 进化生物学
- 基因组学
- 遗传学
背景情况:
- 基因组呈现出各种各样的进化历史, 复杂化了生命树的准确推断.
- 由于建模和可扩展性限制,当前的基因组学方法往往排除了大量的基因组.
- 需要先进的方法来直接从多个基因组对齐中推断物种树,从而解释不一致性.
研究的目的:
- 介绍一种新的,理论上有基础的物种树推断方法,直接利用多个基因组对齐.
- 解决处理基因组不一致性和可扩展性的现有方法的局限性.
- 提供一种能够分析全基因组数据以进行精确的遗传重建的工具.
主要方法:
- 开发了基于凝聚力对齐的物种树估计器 (CASTER),这是一个基于地点的基因组学方法.
- CASTER 消除了预先定义无重组位点的要求.
- 这种方法旨在扩展到数百种哺乳动物的全基因组.
主要成果:
- 通过包含重组的模拟来证明CASTER的准确性和可扩展性.
- 将CASTER应用于各种生物数据集,展示其在真实世界基因组数据上的性能.
- 展示了CASTER使用每站点分数识别基因组异常的生物和人工模式的能力.
结论:
- CASTER提供了一个理论上合理和可扩展的方法来从全基因组对齐中推断.
- 这种方法有效地处理基因组异常,提高生命树重建的准确性.
- 卡斯特的每站点分析为整个基因组的进化过程和潜在数据文物提供了有价值的见解.
相关概念视频
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
Phylogenetic Trees
45.1K
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.
45.1K
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
43.6K
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.
43.6K
Multi-species Conserved Sequences
3.9K
Next-generation sequencing technologies have created large genomic databases of a variety of animals and plants. Ever since the human genome project was completed, scientists studied the genome of primates, mammals, and other phylogenetically distant living beings. Such large-scale studies have provided new insights into the evolutionary relationship between organisms.
Although the genome of each species varies greatly from each other, a few sequences are highly conserved. Such conserved...
Although the genome of each species varies greatly from each other, a few sequences are highly conserved. Such conserved...
3.9K
The Tree of Life - Bacteria, Archaea, Eukaryotes
32.1K
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...
32.1K

