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Related Concept Videos

Phylogeny01:23

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 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

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...
Evolutionary Relationships through Genome Comparisons02:54

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...
The Tree of Life - Bacteria, Archaea, Eukaryotes02:40

The Tree of Life - Bacteria, Archaea, Eukaryotes

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 extant and...
Microbial Phylogeny01:28

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,...

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Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin
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Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin

Published on: August 14, 2018

An even "newer" animal phylogeny.

Rob DeSalle1, Bernd Schierwater

  • 1American Museum of Natural History, New York, Sackler Institute for Comparative Genomics, New York, NY 10024, USA. desalle@amnh.org

Bioessays : News and Reviews in Molecular, Cellular and Developmental Biology
|October 22, 2008
PubMed
Summary

A new animal phylogeny study uses expressed sequence tags (ESTs) to build large phylogenetic matrices. This research offers updated insights into the evolutionary relationships among major animal groups, prompting further scientific discussion.

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Area of Science:

  • Zoology
  • Evolutionary Biology
  • Genomics

Background:

  • Metazoa, a major monophyletic group, includes diverse organisms like Bilateria, Cnidaria, Porifera, Ctenophores, and Placozoa.
  • Determining the evolutionary relationships within and between these major animal groups has been a long-standing challenge in biology.

Purpose of the Study:

  • To present a novel animal phylogeny based on a high-throughput expressed sequence tag (EST) approach.
  • To critically evaluate the methodologies employed in generating new phylogenetic hypotheses for Metazoa.
  • To discuss the implications of the newly proposed animal phylogeny for understanding metazoan relationships.

Main Methods:

  • Utilized the expressed sequence tag (EST) approach for high-throughput data generation.
  • Constructed large phylogenetic matrices to infer evolutionary relationships.
  • Applied phylogenetic analyses to a broad range of metazoan taxa.

Main Results:

  • Presented a revised phylogeny for the Metazoa, challenging previous hypotheses.
  • The study generated a comprehensive dataset for metazoan phylogenetic analysis.
  • The findings provide a new framework for understanding animal evolution.

Conclusions:

  • The EST approach offers a powerful tool for resolving complex phylogenetic questions in Metazoa.
  • The proposed animal phylogeny warrants further investigation and discussion within the scientific community.
  • This study contributes significantly to our understanding of the evolutionary history of animal life.