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Host associated polymorphisms in the Corynebacterium pseudotuberculosis rpoB gene sequence.

Patricio Retamal¹, Marco Ríos, Felipe Cheuquepán

¹Departamento de Medicina Preventiva Animal, Facultad de Ciencias Veterinarias y Pecuarias, Universidad de Chile. Casilla 2, Correo 15, Santiago, Chile. pretamal@uchile.cl

Veterinary Microbiology

|April 13, 2011

Summary

Corynebacterium pseudotuberculosis strains from sheep, goats, and horses show distinct genetic differences. Analyzing the rpoB gene can differentiate these bacterial subspecies for improved diagnostics.

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Area of Science:

Veterinary Microbiology
Bacterial Pathogenesis
Molecular Diagnostics

Background:

Corynebacterium pseudotuberculosis is a significant pathogen causing diseases like caseous lymphadenitis in livestock.
Subspecies-level characterization of C. pseudotuberculosis strains has been limited, hindering precise diagnostics.
Understanding genetic diversity is crucial for effective disease management in domestic animals.

Purpose of the Study:

To genetically characterize Corynebacterium pseudotuberculosis strains isolated from Chilean domestic animals.
To investigate the utility of the rpoB gene for subspecies-level differentiation.
To identify potential host-associated genetic polymorphisms.

Main Methods:

Sequencing of a hypervariable segment of the rpoB gene from C. pseudotuberculosis isolates.
Analysis of nucleotide sequence polymorphisms to assess genetic relatedness.
Comparative analysis of rpoB sequences from strains infecting different animal hosts.

Main Results:

Identification of host-associated rpoB polymorphisms in strains from sheep, goats, and horses.
Discovery of distinct bacterial genotypes with high nucleotide similarity (98.8–99.8%).
Evidence of genetic divergence correlating with host species.

Conclusions:

Partial rpoB sequence analysis is a valuable tool for differentiating C. pseudotuberculosis strains at the subspecies level.
Identified polymorphisms suggest the existence of host-specific C. pseudotuberculosis genotypes.
This molecular approach can enhance diagnostic accuracy and epidemiological studies.