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Genomic changes during chronic Helicobacter pylori infection
Christian Kraft1, Allison Stack, Christine Josenhans
1Institut für Medizinische Mikrobiologie und Krankenhaushygiene, Medizinische Hochschule Hannover, Carl-Neuberg-Strasse 1, 30625 Hannover, Germany.
Journal of Bacteriology
|December 15, 2005
Summary
Helicobacter pylori genetic diversity arises mainly from homologous recombination, not gene gain or loss. This suggests sequence changes drive H. pylori adaptation within hosts.
Area of Science:
- Microbiology
- Genetics
- Pathogen Evolution
Background:
- Helicobacter pylori exhibits significant genetic variability in gene content and sequence.
- Understanding the mechanisms driving this variability is crucial for comprehending pathogen adaptation.
Purpose of the Study:
- To investigate the origins of genetic variability in Helicobacter pylori.
- To compare genomic changes with sequence-level alterations in H. pylori isolates.
Main Methods:
- Comparative genomics using whole-genome DNA microarrays on 21 patient-derived H. pylori isolate pairs.
- Sequencing of loci identified with genomic changes.
- Integration of microarray data with prior multilocus sequence analysis and mathematical modeling.
Main Results:
- Homologous recombination is the primary driver of genetic change in H. pylori.
- Gene gain or loss events are rare, occurring at a rate of approximately 1 in 650 recombination events.
- Genomic adaptation of H. pylori within a host predominantly involves sequence modification.
Conclusions:
- Homologous recombination, rather than gene acquisition or deletion, is the principal mechanism for H. pylori genetic adaptation.
- Sequence-level changes are key to H. pylori's ability to adapt to individual human hosts.