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Microbial Phylogeny

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 Processes in Microbes

Evolutionary Processes in Microbes

Microbial evolution occurs rapidly due to short generation times and a variety of genetic processes, including horizontal gene transfer, mutation, recombination, and genetic drift. These mechanisms collectively enable microbes to adapt swiftly to changing environments.Horizontal gene transfer (HGT) allows genes to move between different species and occurs through three main mechanisms: conjugation, transformation, and transduction. Conjugation involves direct cell-to-cell contact for DNA...

Evolution of New Traits in Microbes

Evolution of New Traits in Microbes

Microorganisms evolve rapidly due to their large population sizes and short generation times, often exhibiting measurable changes within days under laboratory conditions. Natural selection acts on standing genetic variation, enabling the retention and amplification of beneficial traits that confer fitness advantages in changing environments.Adaptive Pigment Regulation in RhodobacterIn Rhodobacter, a genus of purple non-sulfur bacteria, light-harvesting pigments such as bacteriochlorophyll and...

Evolution of Microbial Genome

Evolution of Microbial Genome

Microbial genome evolution is a highly dynamic process shaped by continual gene gain and loss across species and strains. This genomic flexibility allows microorganisms to adapt rapidly to environmental pressures and interactions with other organisms. Central to understanding this diversity is the distinction between the core and pan genomes.The core genome comprises the genes shared by all sampled strains of a species, representing essential functions needed for fundamental cellular processes.

Microbial Morphologies

Microbial Morphologies

Bacterial and archaeal cells exhibit remarkable diversity in shape and structure, critical in their adaptability and functionality. Among bacteria, the most commonly observed shapes include cocci and bacilli. Cocci are spherical and may exist singly or in groupings such as pairs (diplococci), chains (streptococci), clusters (staphylococci), or tetrads. Bacilli, in contrast, are rod-shaped and can also occur as single cells, in pairs, or chains, depending on their environmental and genetic...

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...

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Updated: Jul 9, 2026

Following the Dynamics of Structural Variants in Experimentally Evolved Populations

Following the Dynamics of Structural Variants in Experimentally Evolved Populations

Published on: February 3, 2023

The structure of microbial evolutionary theory.

¹Department of Biology, Faculty of Science and Engineering, York University, 4700 Keele St, Toronto, Ontario M3J 1P3, Canada. jsapp@yorku.ca

Studies in History and Philosophy of Biological and Biomedical Sciences

|December 7, 2007

Summary

Microbial phylogenetics, using macromolecular sequencing, has revolutionized evolutionary biology by revealing deep evolutionary taxonomy and life's history. Key principles include three primary lineages, symbiosis, and lateral gene transfer.

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Last Updated: Jul 9, 2026

Following the Dynamics of Structural Variants in Experimentally Evolved Populations

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Procedure for Adaptive Laboratory Evolution of Microorganisms Using a Chemostat

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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

Area of Science:

Microbial evolutionary biology
Phylogenetics
Genomics

Background:

Classical evolutionary biology differs from microbial evolution in methods and concepts.
Macromolecular sequencing has enabled unprecedented microbial classification and evolutionary insights.

Purpose of the Study:

To explore the transformative impact of microbial phylogenetics on evolutionary biology.
To highlight the core principles and ongoing debates in microbial evolutionary biology.

Main Methods:

Deployment of macromolecular sequencing for microbial classification.
Comparative analysis of phylogenetic data.

Main Results:

Established a deep evolutionary taxonomy for microbes, previously unattainable.
Revealed three primary phylogenetic lineages as central to microbial evolution.
Highlighted the significance of symbiosis and lateral gene transfer in evolutionary innovation.

Conclusions:

Microbial phylogenetics has fundamentally reshaped evolutionary biology, offering new perspectives on life's history.
The core principles of microbial evolution, including three lineages, symbiosis, and lateral gene transfer, are subjects of ongoing scientific discussion.