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Liu S, Yang X, Li R, Wang S, Han Z, Yang M, Zhang Y. IS6 family insertion sequences promote optrA dissemination between plasmids varying in transfer abilities. Appl Microbiol Biotechnol 2024; 108:132. [PMID: 38229329 DOI: 10.1007/s00253-023-12858-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Revised: 09/25/2023] [Accepted: 11/13/2023] [Indexed: 01/18/2024]
Abstract
Plasmids are the primary vectors for intercellular transfer of the oxazolidinone and phenicol cross-resistance gene optrA, while insertion sequences (ISs) are mobile genetic elements that can mobilize plasmid-borne optrA intracellularly. However, little is known about how the IS-mediated intracellular mobility facilitates the dissemination of the optrA gene between plasmid categories that vary in transfer abilities, including non-mobilizable, mobilizable, and conjugative plasmids. Here, we performed a holistic genomic study of 52 optrA-carrying plasmids obtained from searches guided by the Comprehensive Antibiotic Resistance Database. Among the 132 ISs identified within 10 kbp from the optrA gene in the plasmids, IS6 family genes were the most prevalent (86/132). Homologous gene arrays containing IS6 family genes were shared between different plasmids, especially between mobilizable and conjugative plasmids. All these indicated the central role of IS6 family genes in disseminating plasmid-borne optrA. Thirty-three of the 52 plasmids were harbored by Enterococcus faecalis found mainly in humans and animals. By Nanopore sequencing and inverse PCR, the potential of the enterococcal optrA to be transmitted from a mobilizable plasmid to a conjugative plasmid mediated by IS6 family genes was further confirmed in Enterococcus faecalis strains recovered from the effluents of anaerobic digestion systems for treating chicken manure. Our findings highlight the increased intercellular transfer abilities and dissemination risk of plasmid-borne optrA gene caused by IS-mediated intracellular mobility, and underscore the importance of routinely monitoring the dynamic genetic contexts of clinically important antibiotic resistance genes to effectively control this critical public health threat. KEY POINTS: • IS6 was prevalent in optrA-plasmids varying in intercellular transfer abilities. • Enterococcal optrA-plasmids were widespread among human, animal, and the environment. • IS6 elevated the dissemination risk of enterococcal optrA-plasmids.
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Affiliation(s)
- Shihai Liu
- State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
- National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Xiaoxiao Yang
- State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
| | - Ruichao Li
- College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, Jiangsu, China
| | - Shaolin Wang
- National Key Laboratory of Veterinary Public Health Security, College of Veterinary Medicine, China Agricultural University, Beijing, 100193, China
| | - Ziming Han
- State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
- National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Min Yang
- State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
- National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Yu Zhang
- State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China.
- National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China.
- University of Chinese Academy of Sciences, Beijing, 100049, China.
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Dai X, Sun J, Zhao W, Wang J, Zhang X, Liu X, Li A, Zhao J, Han P, Wang X, Wang L, Huang J. Emergence of a novel ISS1N-optrA-carrying transposon within an integrative and conjugative element from Streptococcus parasuis. J Antimicrob Chemother 2024; 79:61-65. [PMID: 37965874 DOI: 10.1093/jac/dkad347] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2023] [Accepted: 10/25/2023] [Indexed: 11/16/2023] Open
Abstract
OBJECTIVES To investigate the genetic context and transferability of the oxazolidinone resistance gene optrA in a Streptococcus parasuis isolate. METHODS The optrA-carrying S. parasuis isolate SFJ45 was characterized by PCR, antimicrobial susceptibility testing, complete genome sequencing and bioinformatic analysis. The transferability of optrA was verified by conjugation, followed by SmaI-PFGE and Southern blotting. RESULTS The S. parasuis isolate SFJ45 was positive for optrA, mef(A), msr(D), erm(B), tetAB(P)', tet(M), aadE, aphA3, catQ, dfrG and mdt(A), conferring an MDR phenotype. The optrA gene was flanked by ISS1N at both termini in the same orientation, representing a novel 8750 bp pseudo-compound transposon, organized as the ISS1N-hth-clb-4hp-optrA-2hp-ISS1N structure. The ISS1N-optrA-carrying transposon was further inserted within an integrative and conjugative element, ICESpsuSFJ45, at 3' end of the fda gene. Conjugative transfer of the ISS1N-optrA-carrying transposon with ICESpsuSFJ45 was observed from S. parasuis to Streptococcus suis at a frequency of (1.01 ± 3.12) × 10-7. CONCLUSIONS ISS1N was found to be associated with optrA spreading for the first time. Integration of the ISS1N-optrA transposon within ICESpsuSFJ45 may lead to the co-selection of optrA with other antimicrobial resistance genes, contributing to its horizontal transfer from S. parasuis to clinically more important bacterial pathogens.
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Affiliation(s)
- Xingyang Dai
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China
| | - Junjie Sun
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China
| | - Wenbin Zhao
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China
| | - Jianzhong Wang
- Agricultural Technology Integrated Service Center, Agricultural and Rural Bureau of Xiangcheng District of Suzhou City, Suzhou 215131, China
| | - Xiaohui Zhang
- Department of Veterinary Medicine, College of Animal Science and Technology, Hainan University, Haikou 570228, China
| | - Xiao Liu
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China
| | - Aijuan Li
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China
| | - Jiaqi Zhao
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China
| | - Peizhao Han
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China
| | - Xiaoming Wang
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China
- Risk Assessment Center of Veterinary Drug Residue and Antimicrobial Resistance, Nanjing Agricultural University, Nanjing 210095, China
- Center for Veterinary Drug Research and Evaluation, Nanjing Agricultural University, Nanjing 210095, China
| | - Liping Wang
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China
- Risk Assessment Center of Veterinary Drug Residue and Antimicrobial Resistance, Nanjing Agricultural University, Nanjing 210095, China
- Center for Veterinary Drug Research and Evaluation, Nanjing Agricultural University, Nanjing 210095, China
| | - Jinhu Huang
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China
- Risk Assessment Center of Veterinary Drug Residue and Antimicrobial Resistance, Nanjing Agricultural University, Nanjing 210095, China
- Center for Veterinary Drug Research and Evaluation, Nanjing Agricultural University, Nanjing 210095, China
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