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Evolutionary Relationships through Genome Comparisons

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...

Phylogenetic Trees

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.

Phylogeny

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.

What is Evolutionary History?

What is Evolutionary History?

Scientists record evolutionary history by analyzing fossil, morphological, and genetic data. The fossil record documents the history of life on Earth and provides evidence for evolution. However, both fossil and living organisms offer evidence that outlines Earth’s evolutionary history.

Gene Families

Gene Families

Gene families consist of groups of genes proposed to have originated from a common ancestor. Typically these arise through events in which a gene or genes are mistakenly duplicated during cell division. Unlike their parent genes (which are subject to selection pressure to maintain function), these gene copies do not need to preserve their sequences and may evolve at a relatively faster rate.
Occasionally these regions can be adapted to take on new roles within the organism, becoming novel genes...

Gene Families

Gene Families

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Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin

Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin

Published on: August 14, 2018

Reconstructing Evolutionary Histories with Hierarchical Orthologous Groups.

Garance Sarton-Lohéac¹, Nikolai Romashchenko^2,3, Clément Marie Train²

¹Department of Fundamental Microbiology, University of Lausanne, 1015, Lausanne, Switzerland.

Journal of Molecular Evolution

|November 21, 2025

Summary

This summary is machine-generated.

Hierarchical Orthologous Groups (HOGs) offer a precise, scalable method for analyzing gene families and evolutionary histories. This framework enhances understanding of gene relationships and species evolution across large-scale sequencing data.

Keywords:

Ancestral genomes Comparative genomics Gene function Hierarchical orthologous groups Orthology Orthology benchmarking Paralogy Phylogenetics

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Area of Science:

Genomics
Evolutionary Biology
Bioinformatics

Background:

Large-scale sequencing necessitates efficient methods for inferring gene relationships.
Traditional methods for identifying orthologs and paralogs have limitations in scalability and precision.

Purpose of the Study:

To introduce Hierarchical Orthologous Groups (HOGs) as a robust framework for gene family analysis.
To explore the advantages, applications, and inference methods of HOGs.

Main Methods:

Conceptual review of Hierarchical Orthologous Groups (HOGs).
Discussion of HOG construction processes and inference challenges.
Highlighting applications in gene family representation and evolutionary analysis.

Main Results:

HOGs offer a precise and scalable approach to studying gene families.
Key applications include ancestral genome inference, gene gain/loss tracking, functional annotation, and phylogenetic profiling.
The HOG framework structures homologous genes for deeper evolutionary insights.

Conclusions:

HOGs provide a structured method for organizing homologous genes.
This framework is crucial for understanding gene family and species evolution in the context of modern sequencing initiatives.