Gene content differences across strains of Streptococcus uberis identified using oligonucleotide microarray...

Area of Science:

• Veterinary Microbiology
• Bacterial Genomics
• Pathogen Evolution

Background:

• Streptococcus uberis is a primary cause of bovine mastitis.
• It is generally classified as an environmental pathogen.
• Understanding its genetic diversity is crucial for controlling mastitis.

Purpose of the Study:

• To investigate genome flexibility in Streptococcus uberis strains.
• To compare genetic content using multilocus sequence typing (MLST) and whole-genome DNA microarrays.
• To explore the relationship between gene content and epidemiological characteristics.

Main Methods:

• Utilized two MLST schemes and whole-genome DNA microarrays for analysis.
• Examined 21 S. uberis isolates from a larger international collection.
• Estimated the core genome and identified regions of difference (RDs) in variable gene content.

Main Results:

• The core genome of S. uberis comprises approximately 82.5% of genes (1530 ORFs).
• 26 regions of difference (RDs) were identified among variable genes, enriched in functions like protection and lateral gene acquisition.
• MLST data indicated high recombination rates, hindering phylogenetic analysis.
• Microarray data suggested a potential link between gene content and transmissibility/host-adaptation.

Conclusions:

• Streptococcus uberis possesses a flexible genome with significant variation in gene content.
• Variable genes are often associated with adaptation and host interaction.
• Further research is needed to confirm the role of specific genes in bovine transmissibility and host adaptation.