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OxyR of Haemophilus parasuis is a global transcriptional regulator important in oxidative stress resistance and growth.
Gene 2018 Februrary 16
Haemophilus parasuis is an opportunistic pathogen and the causative agent of Glässer's disease in swine. This disease has high morbidity and mortality rates in swine populations, and is responsible for major economic losses worldwide. Survival of H. parasuis within the host requires mechanisms for coping with oxidative stress conditions. In many bacteria, OxyR is known to mediate protection against oxidative stress; however, little is known about the role of OxyR in H. parasuis. In the current study, an oxyR mutant strain was constructed in H. parasuis strain SC1401 and designated H. parasuis SC1401∆oxyR. The oxyR mutant strain had a slower growth rate and impaired biofilm formation compared to the wild type strain. Complementation restored the growth-associated phenotypes to wild type levels. Oxidative stress susceptibility testing, using a range of concentrations of H2 O2 , indicated that H. parasuis SC1401∆oxyR was more sensitive to oxidative stress than the wild type strain. RNA sequencing transcriptome analysis comparing H. parasuis SC1401 with H. parasuis SC1401∆oxyR identified 466 differentially expressed genes. These genes were involved in a wide range of biological processes, including: oxidative stress, transcriptional regulation, and DNA replication, recombination, and repair. These findings provide a foundation for future research to examine the role of OxyR as a global transcriptional regulator and to better define its role in oxidative stress resistance in H. parasuis.
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