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Related Concept Videos

Modern Molecular Taxonomy01:29

Modern Molecular Taxonomy

Advancements in molecular biology have revolutionized the identification and characterization of bacteria, with multiple methods leveraging DNA sequencing for enhanced precision. As sequencing technologies improve and costs decline, these approaches are increasingly used in clinical, environmental, and evolutionary studies.Multilocus Sequence Typing (MLST) examines several housekeeping genes, essential chromosomal genes encoding cellular functions, to distinguish strains. Approximately...

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A High-throughput Platform for the Screening of Salmonella spp./Shigella spp.
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Selection and validation of a multilocus variable-number tandem-repeat analysis panel for typing Shigella spp.

Olivier Gorgé1, Stéphanie Lopez, Valérie Hilaire

  • 1Department of Analytical Microbiology, Centre d'Etudes du Bouchet, BP3, F-91710 Vert-le-Petit, France. olivier.gorge@dga.defense.gouv.fr

Journal of Clinical Microbiology
|January 25, 2008
PubMed
Summary

Multilocus variable-number tandem-repeat analysis (MLVA) effectively types Shigella and Escherichia strains, offering a rapid and discriminatory method. This approach aids in tracking bacterial infections and outbreaks, complementing existing methods like multilocus sequence typing (MLST).

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Area of Science:

  • Microbiology and Molecular Biology
  • Genetics and Genomics
  • Epidemiology

Background:

  • Traditional Shigella classification relies on biochemical assays and serotyping, which have limitations in phylogenetic analysis.
  • Genome sequencing and multilocus sequence typing (MLST) have advanced understanding of Shigella and Escherichia evolution, revealing their close relationship.
  • Multilocus variable-number tandem-repeat analysis (MLVA) offers polymorphic markers for genotyping bacterial pathogens.

Purpose of the Study:

  • To evaluate the efficacy of MLVA for typing Shigella strains.
  • To assess MLVA's potential for differentiating Shigella and Escherichia coli strains, including pathogenic types.
  • To establish a robust MLVA assay for epidemiological investigations.

Main Methods:

  • In silico analysis of five Shigella genomic sequences identified 32 potentially polymorphic VNTRs.
  • A panel of 15 VNTRs (MLVA15) was selected and validated.
  • MLVA15 analysis was performed on 78 Shigella strains/sequences and 11 Escherichia coli strains/sequences.

Main Results:

  • MLVA15 analysis successfully distinguished 83 distinct genotypes among the tested Shigella and Escherichia coli strains.
  • Shigella population clustering using MLVA15 aligned with results from MLST.
  • MLVA15 demonstrated capability in classifying pathogenic and non-pathogenic Escherichia coli strains.

Conclusions:

  • The MLVA15 assay is a rapid, highly discriminatory, and reproducible method for typing Shigella and Escherichia strains.
  • MLVA15 shows significant potential for epidemiological trace-back analysis of Shigella infections and pathogenic Escherichia outbreaks.
  • Further studies are recommended to include a broader range of pathogenic Escherichia coli types and diverse strain origins.