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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...
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...
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,...
Synteny and Evolution02:31

Synteny and Evolution

John H. Renwick first coined the term “synteny” in 1971, which refers to the genes present on the same chromosomes, even if they are not genetically linked. The species with common ancestry tend to show conserved syntenic regions. Therefore, the concept of synteny is nowadays used to describe the evolutionary relationship between species.
Around 80 million years ago, the human and mice lineages diverged from the common ancestor. During the course of evolution, the ancestral chromosome underwent...
Gene Evolution - Fast or Slow?02:05

Gene Evolution - Fast or Slow?

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.
In contrast, regions which code...
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...

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Heuristic Mining of Hierarchical Genotypes and Accessory Genome Loci in Bacterial Populations
08:03

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Published on: December 7, 2021

Using PQ structures for genomic rearrangement phylogeny.

Laxmi Parida1

  • 1Computational Biology Center, IBM T.J.Watson Research Center, Yorktown Heights, New York 10598, USA. parida@us.ibm.com

Journal of Computational Biology : a Journal of Computational Molecular Cell Biology
|January 24, 2007
PubMed
Summary

This study introduces a novel method for reconstructing human phylogeny trees by analyzing genomic variations. The approach utilizes a modified PQ tree structure to efficiently identify common ancestors and evolutionary relationships within the species.

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Area of Science:

  • Genomics
  • Computational Biology
  • Evolutionary Biology

Background:

  • International efforts aim to catalog human genomic similarities and variations.
  • Discoveries include inversions and transpositions within the human species.
  • Reconstructing phylogeny trees for closely related individuals is challenging.

Purpose of the Study:

  • To develop an efficient method for human phylogeny tree reconstruction.
  • To address the challenge of small genetic distances between individuals.
  • To leverage genomic variations for understanding human evolutionary history.

Main Methods:

  • Utilizing a modified PQ tree structure (oPQ) for sequence analysis.
  • Exploiting the property of small genetic distances within the human species.
  • Developing a statistically well-defined framework for tree reconstruction.

Main Results:

  • Demonstrated that the number and size of consensus PQ trees (T) are constant (O(1)).
  • Established the statistical well-definedness of the tree reconstruction problem.
  • Presented a simple scheme for constructing phylogeny trees and identifying common ancestors.

Conclusions:

  • The proposed method offers a promising approach for human phylogeny reconstruction.
  • The oPQ structure provides an efficient tool for analyzing genomic data.
  • Preliminary experiments with simulated data yield encouraging results for evolutionary studies.