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Identification of Genes Regulating Cell Death in Staphylococcus aureus

Rebecca Yee, Jie Feng, Jiou Wang, Jiazhen Chen, Ying Zhang
doi: https://doi.org/10.1101/569053
Rebecca Yee
aDepartment of Molecular Microbiology and Immunology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD
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Jie Feng
aDepartment of Molecular Microbiology and Immunology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD
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Jiou Wang
bDepartment of Biochemistry and Molecular Biology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD
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Jiazhen Chen
cDepartment of Infectious Diseases, Huashan Hospital, Fudan University, Shanghai, China
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Ying Zhang
aDepartment of Molecular Microbiology and Immunology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD
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  • For correspondence: yzhang@jhsph.edu
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Abstract

Staphylococcus aureus is an opportunistic pathogen that causes acute and chronic infections. Due to S. aureus’ s highly resistant and persistent nature, it is paramount to identify better drug targets in order to eradicate S. aureus infections. Despite the efforts in understanding bacterial cell death, the genes and pathways of S. aureus cell death remain elusive. Here, we performed a genome-wide screen using a transposon mutant library to study the genetic mechanisms involved in S. aureus cell death. Using a precisely controlled heat-ramp and acetic acid exposure assays, mutations in 27 core genes (hsdR1, hslO, nsaS, sspA, folD, mfd, vraF, kdpB, USA300HOU_2684, 0868, 0369, 0420, 1154, 0142, 0930, 2590, 0997, 2559, 0044, 2004, 1209, 0152, 2455, 0154, 2386, 0232, 0350 involved in transporters, transcription, metabolism, peptidases, kinases, transferases, SOS response, nucleic acid and protein synthesis) caused the bacteria to be more death-resistant. In addition, we identified mutations in core 10 genes (capA, gltT, mnhG1,USA300HOU_1780, 2496, 0200, 2029, 0336, 0329, 2386, involved in transporters, metabolism, transcription, cell wall synthesis) from heat-ramp and acetic acid that caused the bacteria to be more death-sensitive or with defect in persistence. Interestingly, death-resistant mutants were more virulent than the parental strain USA300 and caused increased mortality in a Caenorhabditis elegans infection model. Conversely, death-sensitive mutants were less persistent and formed less persister cells upon exposure to different classes of antibiotics. These findings provide new insights into the mechanisms of S. aureus cell death and offer new therapeutic targets for developing more effective treatments caused by S. aureus.

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Posted March 06, 2019.
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Identification of Genes Regulating Cell Death in Staphylococcus aureus
Rebecca Yee, Jie Feng, Jiou Wang, Jiazhen Chen, Ying Zhang
bioRxiv 569053; doi: https://doi.org/10.1101/569053
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Identification of Genes Regulating Cell Death in Staphylococcus aureus
Rebecca Yee, Jie Feng, Jiou Wang, Jiazhen Chen, Ying Zhang
bioRxiv 569053; doi: https://doi.org/10.1101/569053

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