Abstract
Two rare strains of Proteus mirabilis with swarming migration deficiency were isolated from urine samples of two patients with urinary tract infections and were named as G121 and G137. Migration experiments showed that P. mirabilis HI4320 had typical migration on blood agar, while G121 and G137 had significantly weakened migration ability. Results of adhesion tests showed that the adhesion ability of G121 and G137 to the bladder epithelial cell line 5637 was significantly reduced. High-throughput sequencing and alignment analysis of the transcriptomes of the three P. mirabilis strains were conducted, with P. mirabilis HI4320 as the reference strain. Reverse transcription quantitative PCR (RT-qPCR) was used to verify differentially expressed genes. Results of transcriptome analysis and RT-qPCR showed that, compared to the HI4320 strain, genes related to flagellum and fimbria formation, dicarboxylate transport, and cystathionine and anthranilate metabolism were down-regulated in G121 and G137, while genes related to iron transport, molybdenum metabolism, and metalloprotease were up-regulated, suggesting that these genes may be involved in the migration ability and epithelial cell adhesion ability of P. mirabilis. These results provide important insight to the search for virulence genes and the screening of new antibacterial targets for P. mirabilis.
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Acknowledgements
We would like to thank Prof. Harry L. T. Mobley (Department of Microbiology and Immunology, University of Michigan Medical School) for providing the Proteus mirabilis strain HI4320.
Funding
This study was funded by the National Natural Science Foundation of China (No. 81670637 for Liang Peng) and General Medical Project of Guangzhou Municipal Health Bureau (No. 20171A011300 for Liang Peng).
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Conceived and designed the experiments: LP, DQC, LY, NS. Performed the experiments: LP, DQC, GMJ, JYO. Analyzed the data: LP, LY, NS. Contributed reagents/materials/analysis tools: LTZ, YX, QJ, QYJ. Wrote the paper: LP, DQC, LY, NS.
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All experiments were approved by the Ethics Committee of the Fifth Affiliated Hospital of Guangzhou Medical University.
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Peng, L., Chen, DQ., Jiang, GM. et al. Transcriptome Analysis of Two Strains of Proteus mirabilis with Swarming Migration Deficiency Isolated from Patients with Urinary Tract Infection. Curr Microbiol 77, 1381–1389 (2020). https://doi.org/10.1007/s00284-020-01931-6
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DOI: https://doi.org/10.1007/s00284-020-01931-6