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Related Experiment Video

Updated: Jun 13, 2026

A Fluorescence-based Method to Study Bacterial Gene Regulation in Infected Tissues

A Fluorescence-based Method to Study Bacterial Gene Regulation in Infected Tissues

Published on: February 19, 2019

SOS regulatory elements are essential for UPEC pathogenesis.

Birong Li¹, Peter Smith, Dennis J Horvath

¹Center for Microbial Pathogenesis, The Research Institute at Nationwide Children's Hospital, The Ohio State University School of Medicine, Columbus, OH 43205, USA.

Microbes and Infection

|May 4, 2010

Summary

This summary is machine-generated.

Epithelial cells use DNA damage to control invading bacteria like UPEC. Bacterial DNA repair regulators, SulA, LexA, and RecA, are crucial for virulence in the urinary tract infection model.

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Last Updated: Jun 13, 2026

A Fluorescence-based Method to Study Bacterial Gene Regulation in Infected Tissues

A Fluorescence-based Method to Study Bacterial Gene Regulation in Infected Tissues

Published on: February 19, 2019

Area of Science:

Microbiology
Cell Biology
Infectious Diseases

Background:

Epithelial cells act as a primary defense against pathogens.
Mechanisms by which epithelial cells control bacterial infections are not fully understood.
SulA, a DNA damage repair protein, is vital for Uropathogenic Escherichia coli (UPEC) virulence in a mouse model of urinary tract infection.

Purpose of the Study:

To investigate the role of DNA damage repair regulators in the intracellular survival of UPEC within bladder epithelial cells.
To understand how LexA and RecA influence the SOS response and bacterial virulence.
To determine the significance of bacterial DNA repair in combating epithelial defense mechanisms.

Main Methods:

Examining UPEC strains with defects in LexA and RecA mediated SOS response regulation.
Assessing bacterial virulence in immunocompetent and immunocompromised mouse models.
Analyzing the intracellular lifestyle of UPEC within superficial bladder epithelial cells.

Main Results:

UPEC strains lacking proper RecA and LexA regulation of the SOS response showed reduced virulence in immunocompetent mice within 6 hours.
The RecA and LexA regulation of the SOS regulon was not essential for virulence in immunocompromised mice.
Epithelial cells appear to generate DNA-damaging agents that necessitate bacterial DNA repair for survival.

Conclusions:

Bacterial DNA damage repair mechanisms are essential for controlling pathogen invasion at the epithelial barrier.
The epithelial defense system relies on DNA damaging agents to manage bacterial presence.
Intracellular bacterial adaptation to DNA damage may confer resistance to host immune responses, such as phagocytosis.