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Song Y, Xu X, Huang Z, Xiao Y, Yu K, Jiang M, Yin S, Zheng M, Meng H, Han Y, Wang Y, Wang D, Wei Q. Genomic Characteristics Revealed Plasmid-Mediated Pathogenicity and Ubiquitous Rifamycin Resistance of Rhodococcus equi. Front Cell Infect Microbiol 2022; 12:807610. [PMID: 35252029 PMCID: PMC8891757 DOI: 10.3389/fcimb.2022.807610] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2021] [Accepted: 01/27/2022] [Indexed: 11/22/2022] Open
Abstract
Rhodococcus equi is a zoonotic pathogen that can cause fatal disease in patients who are immunocompromised. At present, the epidemiology and pathogenic mechanisms of R. equi infection are not clear. This study characterized the genomes of 53 R. equi strains from different sources. Pan-genome analysis showed that all R. equi strains contained 11481 pan genes, including 3690 core genes and 602 ~ 1079 accessory genes. Functional annotation of pan genome focused on the genes related to basic lifestyle, such as the storage and expression of metabolic and genetic information. Phylogenetic analysis based on pan-genome showed that the R. equi strains were clustered into six clades, which was not directly related to the isolation location and host source. Also, a total of 84 virulence genes were predicted in 53 R. equi strains. These virulence factors can be divided into 20 categories related to substance metabolism, secreted protein and immune escape. Meanwhile, six antibiotic resistance genes (RbpA, tetA (33), erm (46), sul1, qacEdelta 1 and aadA9) were detected, and all strains carried RbpA related to rifamycin resistance. In addition, 28 plasmids were found in the 53 R. equi strains, belonging to Type-A (n = 14), Type-B (n = 8) and Type-N (n = 6), respectively. The genetic structures of the same type of plasmid were highly similar. In conclusion, R. equi strains show different genomic characteristics, virulence-related genes, potential drug resistance and virulence plasmid structures, which may be conducive to the evolution of its pathogenesis.
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Affiliation(s)
- Yang Song
- National Pathogen Resource Center, Chinese Center for Disease Control and Prevention (China CDC), Beijing, China
| | - Xinmin Xu
- Department of Clinical Laboratory, Beijing Ditan Hospital, Capital Medical University, Beijing, China
| | - Zhenzhou Huang
- Center for human Pathogenic Culture Collection, National Institute for Communicable Disease Control and Prevention, China CDC, Beijing, China
| | - Yue Xiao
- Center for human Pathogenic Culture Collection, National Institute for Communicable Disease Control and Prevention, China CDC, Beijing, China
| | - Keyi Yu
- Center for human Pathogenic Culture Collection, National Institute for Communicable Disease Control and Prevention, China CDC, Beijing, China
| | - Mengnan Jiang
- National Pathogen Resource Center, Chinese Center for Disease Control and Prevention (China CDC), Beijing, China
| | - Shangqi Yin
- Department of Clinical Laboratory, Beijing Ditan Hospital, Capital Medical University, Beijing, China
| | - Mei Zheng
- Department of Clinical Laboratory, Beijing Ditan Hospital, Capital Medical University, Beijing, China
| | - Huan Meng
- Department of Clinical Laboratory, Beijing Ditan Hospital, Capital Medical University, Beijing, China
| | - Ying Han
- Department of Clinical Laboratory, Beijing Ditan Hospital, Capital Medical University, Beijing, China
| | - Yajie Wang
- Department of Clinical Laboratory, Beijing Ditan Hospital, Capital Medical University, Beijing, China
- *Correspondence: Qiang Wei, ; Duochun Wang, ; Yajie Wang,
| | - Duochun Wang
- Center for human Pathogenic Culture Collection, National Institute for Communicable Disease Control and Prevention, China CDC, Beijing, China
- *Correspondence: Qiang Wei, ; Duochun Wang, ; Yajie Wang,
| | - Qiang Wei
- National Pathogen Resource Center, Chinese Center for Disease Control and Prevention (China CDC), Beijing, China
- *Correspondence: Qiang Wei, ; Duochun Wang, ; Yajie Wang,
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Ou T, Zhang M, Huang Y, Wang L, Wang F, Wang R, Liu X, Zhou Z, Xie J, Xiang Z. Role of Rhizospheric Bacillus megaterium HGS7 in Maintaining Mulberry Growth Under Extremely Abiotic Stress in Hydro-Fluctuation Belt of Three Gorges Reservoir. FRONTIERS IN PLANT SCIENCE 2022; 13:880125. [PMID: 35712602 PMCID: PMC9195505 DOI: 10.3389/fpls.2022.880125] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2022] [Accepted: 03/17/2022] [Indexed: 05/03/2023]
Abstract
Plant growth-promoting rhizobacteria have been shown to play important roles in maintaining host fitness under periods of abiotic stress, and yet their effect on mulberry trees which regularly suffer drought after flooding in the hydro-fluctuation belt of the Three Gorges Reservoir Region in China remains largely uncharacterized. In the present study, 74 bacterial isolates were obtained from the rhizosphere soil of mulberry after drought stress, including 12 phosphate-solubilizing and 10 indole-3-acetic-acid-producing isolates. Bacillus megaterium HGS7 was selected for further study due to the abundance of traits that might benefit plants. Genomic analysis revealed that strain HGS7 possessed multiple genes that contributed to plant growth promotion, stress tolerance enhancement, and antimicrobial compound production. B. megaterium HGS7 consistently exhibited antagonistic activity against phytopathogens and strong tolerance to abiotic stress in vitro. Moreover, this strain stimulated mulberry seed germination and seedling growth. It may also induce the production of proline and antioxidant enzymes in mulberry trees to enhance drought tolerance and accelerate growth recovery after drought stress. The knowledge of the interactions between rhizobacteria HGS7 and its host plant might provide a potential strategy to enhance the drought tolerance of mulberry trees in a hydro-fluctuation belt.
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Affiliation(s)
- Ting Ou
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory of Sericultural Biology and Genetic Breeding in Ministry of Agriculture, College of Sericulture, Textile and Biomass Sciences, Southwest University, Chongqing, China
| | - Meng Zhang
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory of Sericultural Biology and Genetic Breeding in Ministry of Agriculture, College of Sericulture, Textile and Biomass Sciences, Southwest University, Chongqing, China
| | - Yazhou Huang
- Kaizhou District Nature Reserve Management Center, Chongqing, China
| | - Li Wang
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory of Sericultural Biology and Genetic Breeding in Ministry of Agriculture, College of Sericulture, Textile and Biomass Sciences, Southwest University, Chongqing, China
| | - Fei Wang
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory of Sericultural Biology and Genetic Breeding in Ministry of Agriculture, College of Sericulture, Textile and Biomass Sciences, Southwest University, Chongqing, China
| | - Ruolin Wang
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory of Sericultural Biology and Genetic Breeding in Ministry of Agriculture, College of Sericulture, Textile and Biomass Sciences, Southwest University, Chongqing, China
| | - Xiaojiao Liu
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory of Sericultural Biology and Genetic Breeding in Ministry of Agriculture, College of Sericulture, Textile and Biomass Sciences, Southwest University, Chongqing, China
| | - Zeyang Zhou
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory of Sericultural Biology and Genetic Breeding in Ministry of Agriculture, College of Sericulture, Textile and Biomass Sciences, Southwest University, Chongqing, China
- College of Life Sciences, Chongqing Normal University, Chongqing, China
| | - Jie Xie
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory of Sericultural Biology and Genetic Breeding in Ministry of Agriculture, College of Sericulture, Textile and Biomass Sciences, Southwest University, Chongqing, China
- *Correspondence: Jie Xie,
| | - Zhonghuai Xiang
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory of Sericultural Biology and Genetic Breeding in Ministry of Agriculture, College of Sericulture, Textile and Biomass Sciences, Southwest University, Chongqing, China
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