Transcriptomic analysis reveals that the small protein MgtS contributes to the virulence of uropathogenic Escherichia...

Area of Science:

• Microbiology
• Molecular Biology
• Infectious Diseases

Background:

• Uropathogenic Escherichia coli (UPEC) is a primary cause of urinary tract infections (UTIs).
• UPEC pathogenesis involves forming intracellular bacterial communities (IBCs) within bladder epithelial cells (BECs).

Purpose of the Study:

• To comprehensively analyze UPEC gene expression within BECs using RNA sequencing.
• To identify novel virulence factors and regulatory mechanisms involved in UPEC's intracellular lifestyle.

Main Methods:

• RNA sequencing to profile UPEC gene expression after BEC invasion.
• Investigating the role of the small protein MgtS in UPEC virulence.
• Confirming the regulatory role of the PhoPQ two-component system on mgtS expression.

Main Results:

• Identified MgtS as a small protein upregulated in BECs, positively impacting UPEC invasion and bladder colonization.
• Confirmed PhoPQ as a direct activator of mgtS expression in BECs.
• Proposed magnesium limitation as a host-derived cue activating the PhoPQ-mgtS pathway.

Conclusions:

• This study offers the first comprehensive transcriptomic analysis of UPEC within BECs.
• Revealed MgtS as a novel virulence-associated gene in UPEC pathogenesis.
• Elucidated a new regulatory mechanism involving PhoPQ and magnesium limitation for UPEC virulence in UTIs.