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A Murine Model of Group B Streptococcus Vaginal Colonization
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RodA Promotes Intestinal Colonization by Group B Streptococcus.

Michelle J Vaz, Sanjana Sankaran, Molly E Sharp

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    Summary
    This summary is machine-generated.

    The gene rodA is essential for Group B Streptococcus (GBS) gut colonization fitness. Deleting rodA impairs GBS growth in bile and competition with wild-type strains in mice.

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    Area of Science:

    • Microbiology
    • Bacterial Pathogenesis
    • Molecular Biology

    Background:

    • Group B Streptococcus (GBS) intestinal colonization is a key factor in infant late-onset disease.
    • The gene rodA encodes a peptidoglycan polymerase involved in bacterial cell wall synthesis and integrity.

    Purpose of the Study:

    • To investigate the role of rodA in GBS gastrointestinal colonization.
    • To understand the impact of rodA deletion on GBS morphology, growth, and host cell interactions.

    Main Methods:

    • Comparison of wild-type GBS (A909 WT) and a rodA deletion mutant (A909ΔrodA) in a murine model.
    • Transmission electron microscopy (TEM) for morphological analysis.
    • In vitro assessment of growth under stress and host cell adhesion.

    Main Results:

    • The A909ΔrodA mutant exhibited altered morphology (chaining/aggregation) and confirmed capsule presence.
    • In competitive colonization, A909 WT outcompeted A909ΔrodA, though monocolonization showed similar bacterial burdens.
    • The mutant showed impaired growth in bile and increased adhesion to intestinal epithelial cells in vitro.

    Conclusions:

    • rodA is crucial for GBS intestinal colonization fitness.
    • Deletion of rodA increases GBS susceptibility to GI stressors and reduces its competitive ability in vivo.