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Related Concept Videos

Evolutionary Relationships through Genome Comparisons02:54

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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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Phylogeny01:23

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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.
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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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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...
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A Practical Guide to Phylogenetics for Nonexperts
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A Guide to Phylogenomic Inference.

José S L Patané1, Joaquim Martins2, João Carlos Setubal3

  • 1Laboratório de Genética e Cardiologia Molecular, Instituto do Coração/Heart Institute Hospital das Clínicas - Faculdade de Medicina da Universidade de São Paulo São Paulo, São Paulo, SP, Brazil.

Methods in Molecular Biology (Clifton, N.J.)
|May 31, 2024
PubMed
Summary

Phylogenomics reconstructs evolutionary history using whole genomes. This approach offers insights into species relationships and biological diversity, with practical examples provided.

Keywords:
Gene treesPhylogenetic networksPhylogenomicsPhylogenySpecies treesWhole genome

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Area of Science:

  • Evolutionary biology
  • Systematics
  • Comparative genomics
  • Conservation genetics

Background:

  • Phylogenomics utilizes entire genomes for evolutionary history reconstruction.
  • It has broad applications in understanding species origins and relationships.
  • This field is crucial for advancing biological diversity and evolutionary studies.

Purpose of the Study:

  • To survey phylogenetic concepts and methods for gene and species tree reconstruction.
  • To address common pitfalls in phylogenomic analyses.
  • To provide a practical example of phylogenomic analysis using bacterial genomes.

Main Methods:

  • Review of phylogenetic concepts and methodologies.
  • Discussion of common challenges and pitfalls in the field.
  • Demonstration of a phylogenomic analysis workflow.

Main Results:

  • Comprehensive overview of phylogenomic techniques.
  • Identification of potential challenges in reconstructing evolutionary histories.
  • Practical application of phylogenomic methods illustrated with a case study.

Conclusions:

  • Phylogenomics provides powerful tools for understanding evolutionary relationships.
  • Awareness of common pitfalls is essential for accurate phylogenetic reconstruction.
  • The presented example facilitates practical implementation of phylogenomic analyses.