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Updated: Oct 12, 2025

A Fluorescence-based Method to Study Bacterial Gene Regulation in Infected Tissues
Published on: February 19, 2019
A LysR-Type Transcriptional Regulator Controls Multiple Phenotypes in Acinetobacter baumannii
Aimee R P Tierney1, Chui Yoke Chin2,3,4,5, David S Weiss2,3,4,5,6
1Department of Microbiology and Immunology, Emory University School of Medicine, Atlanta, GA, United States.
Acinetobacter baumannii virulence switches between opaque and translucent variants. The gene ABUW_1132 regulates this switch, impacting gene expression, motility, and capsule production, offering a target for virulence attenuation.
Area of Science:
- Microbiology
- Molecular Biology
- Genetics
Background:
- Acinetobacter baumannii is a multidrug-resistant Gram-negative pathogen.
- Phenotypic heterogeneity leads to virulent opaque (VIR-O) and avirulent translucent (AV-T) colony variants.
- Understanding the genetic basis of this switch is key to attenuating virulence.
Purpose of the Study:
- To identify and characterize genes regulating the phenotypic switch in Acinetobacter baumannii.
- To investigate the role of ABUW_1132, a LysR-type transcriptional regulator, in virulence and colony switching.
Main Methods:
- Gene deletion mutant construction for ABUW_1132.
- Analysis of gene expression profiles.
- Assessment of colony switching frequency, 3-OH-C12-HSL secretion, surface motility, and capsule production.
Main Results:
- ABUW_1132 deletion significantly decreased VIR-O to AV-T switching (16-fold).
- ABUW_1132 is a global regulator, altering expression of 74 genes.
- Deletion of ABUW_1132 led to reduced motility, loss of 3-OH-C12-HSL secretion, and increased capsule production in AV-T variants.
Conclusions:
- ABUW_1132 is a critical global regulator of the Acinetobacter baumannii opacity-virulence switch.
- Targeting ABUW_1132 may offer a strategy to attenuate A. baumannii virulence.
- This study advances understanding of phenotypic switching mechanisms in this nosocomial pathogen.
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