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Related Concept Videos

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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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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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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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...
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Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin
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Published on: August 14, 2018

Two novel closure rules for constructing phylogenetic super-networks.

S Grünewald1, K T Huber, Q Wu

  • 1Department of Combinatorics and Geometry, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China.

Bulletin of Mathematical Biology
|July 31, 2008
PubMed
Summary
This summary is machine-generated.

This study introduces new closure rules, the Y-rule and M-rule, to construct planar phylogenetic networks from partial trees. These methods avoid complex filtering, offering a more direct approach to inferring evolutionary relationships.

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Area of Science:

  • Evolutionary biology
  • Phylogenetics
  • Computational biology

Background:

  • Reconciling conflicting phylogenetic signals from multiple gene trees into a single species tree is a fundamental challenge.
  • Existing methods like Z-closure and Q-imputation can produce complex, multidimensional phylogenetic networks requiring filtering.
  • Phylogenetic networks are valuable for representing conflicting evolutionary histories.

Purpose of the Study:

  • To develop novel closure rules for constructing planar phylogenetic networks directly from partial trees.
  • To avoid the complexity and filtering steps associated with previous phylogenetic network construction methods.
  • To explore the theoretical properties and practical applicability of new closure rules in phylogenetics.

Main Methods:

  • Introduction of the novel Y-(closure) rule for phylogenetic network construction.
  • Combination of the Y-rule with Meacham's M-rule to leverage their theoretical properties.
  • Application of the M- and Y-rules to a case study (Rivera et al. "ring of life") and reanalysis of an *Arabidopsis thaliana* dataset.

Main Results:

  • The Y-rule, alone or with the M-rule, generates circular phylogenetic networks representable in the plane.
  • These novel rules offer a more direct method for constructing phylogenetic networks without requiring post-hoc filtering.
  • The case study and data reanalysis demonstrate the reconstructive power of the M- and Y-rules.

Conclusions:

  • The Y- and M-closure rules provide an effective and theoretically sound method for constructing planar phylogenetic networks.
  • These new rules offer a valuable alternative to existing methods, simplifying the process of inferring evolutionary relationships from partial trees.
  • The developed approach has practical implications for understanding complex evolutionary histories and resolving phylogenetic conflicts.