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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...

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...

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.The length of the branches can depict time or the relative amount of change among organisms. For instance, the branch length might indicate the number of amino acid changes in the sequence that underlies the...

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.The length of the branches can depict time or the relative amount of change among organisms. For instance, the branch length might indicate the number of amino acid changes in the sequence that underlies the...

Microbial Phylogeny

Microbial Phylogeny

Understanding the evolutionary relationships among microorganisms is fundamental to microbial ecology and taxonomy. Phylogenetic trees are essential tools for inferring these relationships, relying primarily on comparative analyses of molecular sequences such as DNA, RNA, or proteins. In microbial studies, these trees typically depict the evolutionary paths of diverse bacterial and archaeal species by mapping genetic differences accumulated over time.Phylogenetic trees are composed of tips,...

Genome Annotation and Assembly

Genome Annotation and Assembly

The genome refers to all of the genetic material in an organism. It can range from a few million base pairs in microbial cells to several billion base pairs in many eukaryotic organisms. Genome assembly refers to the process of taking the DNA sequencing data and putting it all back together in a correct order to create a close representation of the original genome. This is followed by the identification of functional elements on the newly assembled genome, a process called genome annotation.

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Updated: Jun 22, 2026

A Practical Guide to Phylogenetics for Nonexperts

A Practical Guide to Phylogenetics for Nonexperts

Published on: February 5, 2014

An open source phylogenetic search and alignment package.

Hyrum Carroll¹, Adam R Teichert, Jonathan Krein

¹Computer Science Department, Brigham Young University, Provo, Utah 84602, USA. hyrumcarroll@gmail.com

International Journal of Bioinformatics Research and Applications

|June 16, 2009

Summary

This summary is machine-generated.

PSODA is a new, open-source phylogenetics package offering alignment, search, and visualization tools. Its PsodaScript enables complex phylogenetic analyses, advancing novel algorithm development.

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Last Updated: Jun 22, 2026

A Practical Guide to Phylogenetics for Nonexperts

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Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin

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An Integrated Approach for Microprotein Identification and Sequence Analysis

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Area of Science:

Computational Biology
Bioinformatics
Evolutionary Biology

Background:

Phylogenetic analysis is crucial for understanding evolutionary relationships.
Existing tools like PAUP* are powerful but often proprietary.
There is a need for open-source, high-performance phylogenetics software.

Purpose of the Study:

Introduce PSODA, a comprehensive and open-source phylogenetics package.
Highlight the capabilities of PSODA, including alignment, parsimony, and maximum likelihood searches.
Detail the novel PsodaScript feature for implementing advanced phylogenetic algorithms.

Main Methods:

PSODA integrates alignment, phylogenetic search (parsimony, maximum likelihood), and data visualization.
It utilizes an extended NEXUS format called PsodaScript, incorporating conditional and loop constructs.
Performance is benchmarked against established software like PAUP*.

Main Results:

PSODA provides performance comparable to PAUP*.
PsodaScript facilitates the implementation of complex meta-search techniques, such as the parsimony ratchet.
The package is designed to support the development of new phylogenetic algorithms.

Conclusions:

PSODA is a valuable, open-source tool for phylogenetic research.
Its scripting language, PsodaScript, enhances the implementation of advanced phylogenetic methods.
PSODA offers a robust platform for researchers exploring novel phylogenetic techniques.