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Related Concept Videos

Evolution of New Traits in Microbes01:24

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...
Pulmonary Tuberculosis II01:28

Pulmonary Tuberculosis II

Tuberculosis, or TB, is a bacterial infectious disease caused by Mycobacterium tuberculosis. While its primary impact is on the lungs, leading to pulmonary tuberculosis, it can also affect various other organs, a condition referred to as extrapulmonary tuberculosis.
Here is a detailed explanation of its pathophysiology:
Transmission: The process begins when a person inhales droplet nuclei containing M. tuberculosis. These are typically released into the air when an individual with pulmonary or...
Evolution of Microbial Genome01:08

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.
Pulmonary Tuberculosis III01:31

Pulmonary Tuberculosis III

Tuberculosis (TB) is a contagious infection primarily affecting the lung parenchyma but which can also affect other body parts. TB can be classified based on disease development, presentation, and the affected anatomical site.
The first classification is based on the development of the disease, and it includes the following categories:
Evolutionary Processes in Microbes01:26

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...
Pulmonary Tuberculosis I01:29

Pulmonary Tuberculosis I

Tuberculosis, often called TB, is a contagious illness primarily caused by Mycobacterium tuberculosis. It mainly affects the lung parenchyma but can also impact other body parts.
Causative Organism
The primary infectious agent causing tuberculosis is Mycobacterium tuberculosis, a slow-growing, acid-fast, aerobic rod that exhibits sensitivity to heat and ultraviolet light. Instances of Mycobacterium bovis and Mycobacterium avium contributing to the development of TB infection are rare.
Mode of...

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Related Experiment Video

Updated: May 13, 2026

Growth of Mycobacterium tuberculosis Biofilms
09:03

Growth of Mycobacterium tuberculosis Biofilms

Published on: February 15, 2012

Evolution of Mycobacterium tuberculosis.

Marcel A Behr1

  • 1McGill University Health Centre, Montreal General Hospital, Montreal, Canada. marcel.behr@mcgill.ca

Advances in Experimental Medicine and Biology
|March 8, 2013
PubMed
Summary
This summary is machine-generated.

Genomic studies reveal Mycobacterium tuberculosis evolved from an opportunistic pathogen through gene acquisition and DNA changes. Understanding these evolutionary steps illuminates bacterial virulence and host resistance to tuberculosis.

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Area of Science:

  • Microbiology
  • Evolutionary Biology
  • Genomics

Background:

  • The Mycobacterium genus, particularly Mycobacterium tuberculosis, exhibits significant genetic diversity.
  • Understanding this diversity offers insights into the evolution of virulence and host-pathogen interactions.

Purpose of the Study:

  • To elucidate the macro- and micro-evolutionary pathways of Mycobacterium tuberculosis.
  • To identify key genetic events driving the emergence of M. tuberculosis as a professional pathogen.
  • To explore the genetic basis of virulence and host resistance in mycobacterial infections.

Main Methods:

  • Comparative genomics
  • Analysis of horizontal gene transfer events
  • Study of mutation and DNA deletion patterns within the M. tuberculosis complex

Main Results:

  • Identified a two-step evolutionary process for M. tuberculosis: initial gene acquisition by an M. kansasii-like ancestor, followed by diversification within the M. tuberculosis complex.
  • Horizontal gene transfer enabled adaptation to an intracellular niche, transforming an opportunistic pathogen into a professional pathogen.
  • Subspecies and strain variation within the M. tuberculosis complex arose from mutations and DNA deletions.

Conclusions:

  • The evolutionary history of M. tuberculosis provides a framework for understanding bacterial virulence mechanisms.
  • Investigating genetic differences between M. tuberculosis and related mycobacteria can reveal insights into host resistance.
  • Understanding evolutionary forces within the M. tuberculosis complex is crucial for studying its dual role as a symbiont and pathogen.