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Phylogeny

Phylogeny

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.

Phylogenetic Trees

Phylogenetic Trees

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.

Evolutionary Relationships through Genome Comparisons

Evolutionary Relationships through Genome Comparisons

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...

Multi-species Conserved Sequences

Multi-species Conserved Sequences

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...

Gene Evolution - Fast or Slow?

Gene Evolution - Fast or Slow?

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...

Gene Duplication and Divergence

Gene Duplication and Divergence

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...

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相关实验视频

Updated: Jul 6, 2025

Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin

Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin

Published on: August 14, 2018

杜洛-CDP:一个多项式时间算法,用于克拉德受约束的大型杜洛省略问题.

Junyan Dai¹, Tobias Rubel¹, Yunheng Han¹

¹Department of Computer Science, University of Maryland, College Park, MD, USA.

Algorithms for molecular biology : AMB

|January 8, 2024

概括

此摘要是机器生成的。

我们开发了一个新的算法,用于克拉德受约束的Dollo parsimony,改善瘤和物种进化研究的遗传树准确性. 这种方法有效地处理复杂的数据集,提供比传统方法更好的结果.

关键词:

娃娃娃娃娃,这是一个很好的方法.这就是帕西蒙尼 (Parsimony).人类遗传学是一个学科.它们是逆向转移的.

更多相关视频

A Practical Guide to Phylogenetics for Nonexperts

A Practical Guide to Phylogenetics for Nonexperts

Published on: February 5, 2014

Creating and Applying a Reference to Facilitate the Discussion and Classification of Proteins in a Diverse Group

Creating and Applying a Reference to Facilitate the Discussion and Classification of Proteins in a Diverse Group

Published on: August 16, 2017

相关实验视频

Last Updated: Jul 6, 2025

Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin

Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin

Published on: August 14, 2018

A Practical Guide to Phylogenetics for Nonexperts

A Practical Guide to Phylogenetics for Nonexperts

Published on: February 5, 2014

Creating and Applying a Reference to Facilitate the Discussion and Classification of Proteins in a Diverse Group

Creating and Applying a Reference to Facilitate the Discussion and Classification of Proteins in a Diverse Group

Published on: August 16, 2017

科学领域:

人类遗传学和计算生物学.
开发用于进化分析的算法
分子进化和生物信息学

背景情况:

遗传学方法越来越多地使用约束和动态编程来实现最佳树木结构.
种类树方法ASTRAL通过最大化四重奏得分和使用输入基因树二分区来说明这一点.
与二进制字符和缺失数据的节问题尚未完全采用这些基于约束的技术.

研究的目的:

介绍二进制字符的克拉德受约束的字符储蓄问题.
提出一个高效的算法,以解决用clade约束的Dollo节问题.
在软件包 (Dollo-CDP) 中实现和评估算法,以便进行实际的遗传学分析.

主要方法:

开发了一种新的算法,用于克拉德受约束的Dollo parsimony,时间复杂度为O ((nkdakdakCdak).
在Dollo-CDP软件包中实现了算法.
对蝙蝠,鸟类,有牙的鱼和模拟数据集的反向元素插入数据的评估性能.

主要成果:

Dollo-CDP通过经常找到更好的分数树来改善启发式搜索.
该软件可扩展到比分支和绑定方法更大的数据集,同时保持最佳性保证.
该算法可以适应卡明-索卡尔的储蓄,但不能适应菲奇的储蓄.

结论:

克莱德受约束的节提供了一个强大的方法来推断遗传学推断.
Dollo-CDP 提供了一个高效和可扩展的解决方案,用于 Dollo 节省约束.
开发的方法对瘤遗传学和物种进化研究有意义,特别是在低同位素数据的研究中.