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Related Concept Videos

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...
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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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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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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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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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Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin
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Phylogenetic relationships among insect orders based on three nuclear protein-coding gene sequences.

Keisuke Ishiwata1, Go Sasaki, Jiro Ogawa

  • 1Department of Biological Sciences, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan.

Molecular Phylogenetics and Evolution
|November 16, 2010
PubMed
Summary

This study uses DNA polymerase and RNA polymerase II gene sequences to clarify insect evolutionary relationships. The findings strongly support major insect group monophyly and resolve many interordinal connections, advancing insect phylogeny.

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Area of Science:

  • * Zoology and evolutionary biology, focusing on insect systematics.
  • * Molecular evolution and phylogenetics of arthropods.

Background:

  • * Insect phylogeny remains contentious despite extensive morphological and molecular research.
  • * Resolving interordinal relationships is crucial for understanding insect evolution.
  • * Previous studies often yielded conflicting or unresolved phylogenetic trees.

Purpose of the Study:

  • * To reconstruct the higher-level phylogeny of insects using novel molecular markers.
  • * To investigate the monophyly and interrelationships of major insect clades.
  • * To evaluate the effectiveness of specific nuclear genes for phylogenetic analysis.

Main Methods:

  • * Sequencing of three nuclear genes: DNA polymerase delta (catalytic subunit) and RNA polymerase II (two largest subunits).
  • * Phylogenetic analyses using maximum likelihood and Bayesian inference methods.
  • * Analysis of approximately 3500 amino acid sites from representatives of all insect orders.

Main Results:

  • * Strong support for the monophyly of Palaeoptera, Neoptera, Polyneoptera, and Holometabola.
  • * Resolved relationships within Polyneoptera, including the Dictyoptera grouping.
  • * Well-resolved Holometabola phylogeny, with Hymenoptera as the sister lineage and detailed sister-groupings for other orders.

Conclusions:

  • * Amino acid sequences of these three nuclear genes provide a robust framework for insect phylogeny.
  • * The study clarifies numerous previously ambiguous interordinal relationships.
  • * Confirms the utility of these genes for resolving deep evolutionary divergences in insects.