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Updated: Jun 28, 2026
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Heuristic Mining of Hierarchical Genotypes and Accessory Genome Loci in Bacterial Populations
Published on: December 7, 2021
Corynebacterium diphtheriae: genome diversity, population structure and genotyping perspectives
1Laboratory of Molecular Microbiology, St Petersburg Pasteur Institute, St Petersburg, Russia. imokrousov@mail.ru
Summary
Diphtheria outbreaks highlight the need for better tracking of Corynebacterium diphtheriae. Genomic markers like CRISPRs and minisatellites can help monitor bacterial changes and prevent future epidemics.
Area of Science:
- Microbiology
- Genomics
- Epidemiology
Background:
- Diphtheria re-emerged in Russia and NIS in the 1990s, demonstrating its continued threat.
- Corynebacterium diphtheriae utilizes bacteriophage-encoded toxin as a primary virulence factor.
- The bacterium has acquired additional pathogenicity factors through lateral gene transfer, enhancing its adaptability.
Purpose of the Study:
- To analyze the genome of Corynebacterium diphtheriae and understand its evolution.
- To investigate the phylogeographical structure and factors influencing C. diphtheriae circulation.
- To identify effective methods for monitoring C. diphtheriae populations and preventing epidemics.
Main Methods:
- Complete genome sequencing of C. diphtheriae.
- Phylogeographical analysis of circulating strains.
- Evaluation of genomic markers for typing and databasing.
Main Results:
- C. diphtheriae exhibits phylogeographical structure influenced by vaccination and socioeconomic factors.
- Importation of endemic strains can trigger localized or large epidemics.
- Increasing population heterogeneity and emergence of new toxigenic variants are alarming.
- CRISPRs and minisatellites show promise as high-resolution genomic markers.
Conclusions:
- Effective monitoring of C. diphtheriae requires portable and discriminatory typing methods.
- CRISPRs and minisatellites are valuable tools for developing high-resolution typing schemes.
- Genomic surveillance is crucial for understanding and controlling diphtheria outbreaks.
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