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Updated: Jan 31, 2026

Separating Bacteria by Capsule Amount Using a Discontinuous Density Gradient

Separating Bacteria by Capsule Amount Using a Discontinuous Density Gradient

Published on: January 7, 2019

Genetic exchanges are more frequent in bacteria encoding capsules.

Olaya Rendueles^1,2, Jorge A Moura de Sousa^1,2, Aude Bernheim^1,2

¹Microbial Evolutionary Genomics, Institut Pasteur, Paris, France.

|December 22, 2018

Summary

Bacterial capsules enhance genetic diversity and adaptation by increasing horizontal gene transfer and homologous recombination. This genetic flexibility aids bacteria in colonizing new environments and resisting antibiotics, particularly in nosocomial pathogens.

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Area of Science:

Microbiology
Genomics
Evolutionary Biology

Background:

Bacterial capsules are crucial for colonization, stress resistance, and antibiotic evasion.
It was hypothesized that capsules might impede genetic exchange, despite its adaptive potential.

Purpose of the Study:

To investigate the association between bacterial capsule systems and rates of genetic exchange.
To determine if capsules influence genome evolution and acquisition of antibiotic resistance genes.

Main Methods:

Analysis of over one hundred bacterial pan-genomes and thousands of individual genomes.
Comparative genomics to assess the correlation between capsule presence and genetic exchange elements.

Main Results:

Bacteria with capsules exhibit larger pan-genomes and higher rates of horizontal gene transfer and homologous recombination.
Capsule-encoding genomes possess more plasmids, conjugative elements, transposases, prophages, and integrons.
Capsular loci are frequently found on mobile genetic elements like plasmids and prophages.

Conclusions:

Capsule systems promote genetic diversity and rapid evolution of gene repertoires in bacteria.
This enhanced genetic adaptability contributes to the success of encapsulated bacteria, including nosocomial pathogens, in challenging environments and under antibiotic pressure.