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Related Concept Videos

Phylogenetic Trees03:21

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 Trees03:21

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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...
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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...
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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.
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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,...

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Related Experiment Video

Updated: Jun 28, 2026

Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin
08:57

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Published on: August 14, 2018

AUGIST: inferring species trees while accommodating gene tree uncertainty.

Jeffrey C Oliver1

  • 1Interdisciplinary Program in Insect Science, University of Arizona, Tucson, AZ 85721, USA. jeffrey.oliver@yale.edu

Bioinformatics (Oxford, England)
|October 28, 2008
PubMed
Summary
This summary is machine-generated.

AUGIST is new software for building species trees that accounts for uncertainty in gene trees. This tool provides confidence estimates for species tree reconstruction, improving phylogenetic accuracy.

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Last Updated: Jun 28, 2026

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12:00

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Area of Science:

  • Phylogenetics
  • Computational Biology
  • Evolutionary Biology

Background:

  • Inferring species trees is complex due to gene tree incongruence.
  • Existing methods often do not fully account for uncertainty in gene genealogies.

Purpose of the Study:

  • Introduce AUGIST (accommodating uncertainty in genealogies while inferring species trees), a novel software package.
  • To provide a robust method for species tree inference that incorporates gene tree uncertainty.

Main Methods:

  • AUGIST is implemented within the Mesquite software system.
  • Utilizes sampling procedures to integrate uncertainty from gene tree reconstruction.

Main Results:

  • Enables the incorporation of gene tree uncertainty into species tree inference.
  • Provides confidence estimates for the resulting species trees.

Conclusions:

  • AUGIST offers a new approach to species tree inference, specifically addressing gene tree uncertainty.
  • The software enhances phylogenetic analysis by providing confidence measures for species trees.