相关实验视频
Updated: Jul 23, 2025
12:00
A Practical Guide to Phylogenetics for Nonexperts
Published on: February 5, 2014
35.4K
埃斯帕利尔:高效的树木和解和祖先重组图的重建使用最大协议森林
David A Rasmussen1,2, Fangfang Guo1
1Department of Entomology and Plant Pathology, North Carolina State University, Campus Box 7613, Raleigh, NC 27695, USA.
Systematic biology
|July 17, 2023
概括
重建祖先重组图 (ARG) 是一个挑战. 这项研究引入了一种使用最大协议森林 (MAF) 调和家族遗传树木的新方法,提高了基因组数据分析的ARG准确性和效率.
科学领域:
- 进化生物学是进化的生物学.
- 生物信息学是一种生物信息学.
- 基因组学就是基因组学.
背景情况:
- 重组创造出具有不同祖先历史的马赛克基因组.
- 从基因组数据中重建祖先重组图 (ARG) 是计算上复杂的.
研究的目的:
- 开发一种方法来调和不一致的家族遗传树来重建ARG.
- 为了提高ARG重建的准确性和效率.
主要方法:
- 利用最大协议森林 (MAFs) 来识别不一致的家族遗传树之间的一致子树.
- 开发了一种调和方法,以保持支持的不一致性,并最大限度地减少遗传学噪音.
- 结合MAF和和解,在整个基因组中选择最佳的本地树木用于ARG构建.
主要成果:
- 启发式ARG重建方法在计算上高效,准确度与精确方法相比较.
- 重建的ARG准确地估计了诸如重组率之类的人口参数.
- 成功地将该方法应用于PotyvirusRNA病毒,区分真正的重组与噪音.
结论:
- 基于MAF的方法为ARG重建提供了一个有效和准确的方法.
- 这种方法有助于理解复杂的进化历史,由重组形成.
- 这种方法对于分析病毒进化和区分生物信号与数据文物是有价值的.
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
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
01:23Phylogeny
44.6K
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.
44.6K
02:37Gene Duplication and Divergence
6.2K
The seminal work of Ohno in 1970 popularized the idea of gene duplication and divergence. DNA sequence comparison studies reveal that a large portion of the genes in bacteria, archaebacteria, and eukaryotes was generated by gene duplication and divergence, indicating its critical role in evolution.
The duplicated copies of the gene are called Paralogs. Paralogs with similar sequences and functions form a gene family. Across several species, a large number of gene families are...
The duplicated copies of the gene are called Paralogs. Paralogs with similar sequences and functions form a gene family. Across several species, a large number of gene families are...
6.2K
02:53Conservative Site-specific Recombination and Phase Variation
6.0K
Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
The recognition sites for Cre recombinase called LoxP...
The recognition sites for Cre recombinase called LoxP...
6.0K
02:31Homologous Recombination
4.7K
4.7K