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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.
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.
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 kingdom.
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,...
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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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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Related Experiment Video

Updated: May 31, 2026

Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin
08:57

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Published on: August 14, 2018

'Lassoing' a phylogenetic tree I: basic properties, shellings, and covers.

Andreas W M Dress1, Katharina T Huber, Mike Steel

  • 1CAS-MPG Partner Institute and Key Lab for Computational Biology, Shanghai, China. andreas.dress@infinity-3.de

Journal of Mathematical Biology
|July 8, 2011
PubMed
Summary
This summary is machine-generated.

This study explores how much genetic data is needed to accurately reconstruct evolutionary trees. It identifies specific subsets of taxa distances sufficient for uniquely determining phylogenetic relationships.

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Last Updated: May 31, 2026

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Area of Science:

  • Evolutionary Biology
  • Phylogenetics
  • Computational Biology

Background:

  • Phylogenetic trees model evolutionary relationships and genetic divergence among species.
  • Reconstructing these trees typically relies on distances between all pairs of taxa (leaves).
  • Modern sequencing provides distance data for only specific taxa combinations, posing a reconstruction challenge.

Purpose of the Study:

  • To determine the minimal subsets of leaf-to-leaf distances required for unique phylogenetic tree reconstruction.
  • To investigate the 'lasso' problem: identifying which distance subsets suffice to "lasso" the correct tree.

Main Methods:

  • Theoretical analysis of tree metrics and distance matrices.
  • Investigating properties of edge-weighted trees and their induced distance matrices.
  • Exploring conditions for unique tree determination from partial distance information.

Main Results:

  • Identifies specific subsets of taxa distances that guarantee unique tree reconstruction.
  • Provides criteria for selecting informative taxa pairs for phylogenetic analysis.
  • Demonstrates that not all leaf-to-leaf distances are equally crucial for tree determination.

Conclusions:

  • Partial distance data can be sufficient for accurate phylogenetic tree reconstruction.
  • Understanding which distance subsets are informative is key for efficient use of sequencing data.
  • This research has implications for inferring evolutionary history with incomplete genetic information.