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Helicobacter pylori evolution and phenotypic diversification in a changing host.

Sebastian Suerbaum1, Christine Josenhans

  • 1Medizinische Hochschule Hannover, Institut für Medizinische Mikrobiologie und Krankenhaushygiene, Carl-Neuberg-Strasse 1, 30625 Hannover, Germany. suerbaum.sebastian@mh-hannover.de

Nature Reviews. Microbiology
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Summary

Helicobacter pylori (H. pylori) exhibits significant genetic diversity, allowing it to adapt to individual hosts. Declining H. pylori prevalence may accelerate its disappearance in Western populations due to reduced genetic recombination.

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Area of Science:

  • Microbiology
  • Genetics
  • Infectious Diseases

Background:

  • Helicobacter pylori is a highly successful human pathogen, colonizing over 50% of the global population.
  • H. pylori displays remarkable genetic variability, with individual strains and in vivo alterations driven by high mutation rates and recombination.

Purpose of the Study:

  • To review current knowledge on H. pylori genetic variation.
  • To explore how genetic changes contribute to host adaptation during chronic colonization.
  • To hypothesize the impact of decreasing H. pylori prevalence on its future in Western populations.

Main Methods:

  • Literature review of studies on H. pylori genetic variation.
  • Analysis of mutation and recombination processes in H. pylori.
  • Examination of host-pathogen interactions and adaptation mechanisms.

Main Results:

  • H. pylori possesses significant allelic diversity and genetic variability, affecting both housekeeping and virulence genes.
  • Genetic variability is crucial for H. pylori's adaptation to individual hosts through modification of host-interacting molecules.
  • Chronic colonization involves ongoing genetic alteration driven by mutation and recombination.

Conclusions:

  • H. pylori leverages mutation and recombination to adapt to its host environment.
  • Reduced intraspecies recombination due to declining H. pylori prevalence may hasten its decline in Western populations.