201
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Zhang AN, Li LG, Ma L, Gillings MR, Tiedje JM, Zhang T. Conserved phylogenetic distribution and limited antibiotic resistance of class 1 integrons revealed by assessing the bacterial genome and plasmid collection. MICROBIOME 2018; 6:130. [PMID: 30031405 PMCID: PMC6054849 DOI: 10.1186/s40168-018-0516-2] [Citation(s) in RCA: 60] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2018] [Accepted: 07/10/2018] [Indexed: 05/26/2023]
Abstract
BACKGROUND Integrons, especially the class 1 integrons, are major contributors to the acquisition and dissemination of antibiotic resistance genes (ARGs). However, comprehensive knowledge of the types, content, and distribution of integrons in bacterial taxa is lacking to evaluate their contribution. RESULTS We have constructed a new integrase database and developed a pipeline that provides comprehensive recovery of class 1 integrons. Previous PCR-based techniques might only detect one fourth of the integron-integrases and integrons recovered in this study. By exploring the class 1 integrons in over 73,000 currently available complete and draft bacterial genomes, the contribution of class 1 integrons in spreading and acquiring ARGs was evaluated. Firstly, the host species of class 1 integrons are highly conserved within (96%) in class Gammaproteobacteria, dominated by four pathogenic species of "ESKAPE." Secondly, more than half of class 1 integrons are embedded in chromosomes with less potential for horizontal gene transfer. Finally, ARGs that have been acquired by these integrons only cover 11% of all the ARG genotypes detected in bacterial genomes. CONCLUSIONS The above observations indicated that there are both biological and ecological limitations to class 1 integrons in acquiring and spreading ARGs across different classes of the domain Bacteria.
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Affiliation(s)
- An Ni Zhang
- Environmental Biotechnology Laboratory, The University of Hong Kong, Hong Kong, China
| | - Li-Guan Li
- Environmental Biotechnology Laboratory, The University of Hong Kong, Hong Kong, China
| | - Liping Ma
- Environmental Biotechnology Laboratory, The University of Hong Kong, Hong Kong, China
| | - Michael R Gillings
- Department of Biological Sciences, Species Spectrum Research Centre, Macquarie University, Sydney, New South Wales, Australia
| | - James M Tiedje
- Center for Microbial Ecology, Michigan State University, East Lansing, MI, USA
| | - Tong Zhang
- Environmental Biotechnology Laboratory, The University of Hong Kong, Hong Kong, China.
- International Center for Antibiotics and Resistance in Environments, Southern University of Science and Technology, Shenzhen, China.
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202
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Subirats J, Timoner X, Sànchez-Melsió A, Balcázar JL, Acuña V, Sabater S, Borrego CM. Emerging contaminants and nutrients synergistically affect the spread of class 1 integron-integrase (intI1) and sul1 genes within stable streambed bacterial communities. WATER RESEARCH 2018; 138:77-85. [PMID: 29573631 DOI: 10.1016/j.watres.2018.03.025] [Citation(s) in RCA: 67] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2017] [Revised: 03/01/2018] [Accepted: 03/09/2018] [Indexed: 06/08/2023]
Abstract
Wastewater effluents increase the nutrient load of receiving streams while introducing a myriad of anthropogenic chemical pollutants that challenge the resident aquatic (micro)biota. Disentangling the effects of both kind of stressors and their potential interaction on the dissemination of antibiotic resistance genes in bacterial communities requires highly controlled manipulative experiments. In this work, we investigated the effects of a combined regime of nutrients (at low, medium and high concentrations) and a mixture of emerging contaminants (ciprofloxacin, erythromycin, sulfamethoxazole, diclofenac, and methylparaben) on the bacterial composition, abundance and antibiotic resistance profile of biofilms grown in artificial streams. In particular, we investigated the effect of this combined stress on genes encoding resistance to ciprofloxacin (qnrS), erythromycin (ermB), sulfamethoxazole (sul1 and sul2) as well as the class 1 integron-integrase gene (intI1). Only genes conferring resistance to sulfonamides (sul1 and sul2) and intI1 gene were detected in all treatments during the study period. Besides, bacterial communities exposed to emerging contaminants showed higher copy numbers of sul1 and intI1 genes than those not exposed, whereas nutrient amendments did not affect their abundance. However, bacterial communities exposed to both emerging contaminants and a high nutrient concentration (1, 25 and 1 mg L-1 of phosphate, nitrate and ammonium, respectively) showed the highest increase on the abundance of sul1 and intI1 genes thus suggesting a factors synergistic effect of both stressors. Since none of the treatments caused a significant change on the composition of bacterial communities, the enrichment of sul1 and intI1 genes within the community was caused by their dissemination under the combined pressure exerted by nutrients and emerging contaminants. To the best of our knowledge, this is the first study demonstrating the contribution of nutrients on the maintenance and spread of antibiotic resistance genes in streambed biofilms under controlled conditions. Our results also highlight that nutrients could enhance the effect of emerging contaminants on the dissemination of antibiotic resistance.
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Affiliation(s)
- Jèssica Subirats
- Catalan Institute for Water Research (ICRA), Scientific and Technological Park of the University of Girona, Girona, Spain.
| | - Xisca Timoner
- Catalan Institute for Water Research (ICRA), Scientific and Technological Park of the University of Girona, Girona, Spain
| | - Alexandre Sànchez-Melsió
- Catalan Institute for Water Research (ICRA), Scientific and Technological Park of the University of Girona, Girona, Spain
| | - José Luis Balcázar
- Catalan Institute for Water Research (ICRA), Scientific and Technological Park of the University of Girona, Girona, Spain
| | - Vicenç Acuña
- Catalan Institute for Water Research (ICRA), Scientific and Technological Park of the University of Girona, Girona, Spain
| | - Sergi Sabater
- Catalan Institute for Water Research (ICRA), Scientific and Technological Park of the University of Girona, Girona, Spain; GRECO, Institute of Aquatic Ecology, University of Girona, Girona, Spain
| | - Carles M Borrego
- Catalan Institute for Water Research (ICRA), Scientific and Technological Park of the University of Girona, Girona, Spain; Group of Molecular Microbial Ecology, Institute of Aquatic Ecology, University of Girona, Girona, Spain
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203
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Zheng HS, Guo WQ, Wu QL, Ren NQ, Chang JS. Electro-peroxone pretreatment for enhanced simulated hospital wastewater treatment and antibiotic resistance genes reduction. ENVIRONMENT INTERNATIONAL 2018; 115:70-78. [PMID: 29550711 DOI: 10.1016/j.envint.2018.02.043] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2017] [Revised: 02/25/2018] [Accepted: 02/25/2018] [Indexed: 06/08/2023]
Abstract
Hospital wastewater is one of the possible sources responsible for antibiotic resistant bacteria spread into the environment. This study proposed a promising strategy, electro-peroxone (E-peroxone) pretreatment followed by a sequencing batch reactor (SBR) for simulated hospital wastewater treatment, aiming to enhance the wastewater treatment performance and to reduce antibiotic resistance genes production simultaneously. The highest chemical oxygen demand (COD) and total organic carbon (TOC) removal efficiency of 94.3% and 92.8% were obtained using the E-peroxone-SBR process. The microbial community analysis through high-throughput sequencing showed that E-peroxone pretreatment could guarantee microbial richness and diversity in SBR, as well as reduce the microbial inhibitions caused by antibiotic and raise the amount of nitrification and denitrification genera. Specially, quantitative real-time PCRs revealed that E-peroxone pretreatment could largely reduce the numbers and contents of antibiotic resistance genes (ARGs) production in the following biological treatment unit. It was indicated that E-peroxone-SBR process may provide an effective way for hospital wastewater treatment and possible ARGs reduction.
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Affiliation(s)
- He-Shan Zheng
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, 73 Huanghe Road, Harbin, Heilongjiang 150090, PR China; School of Chemistry and Environmental Engineering, Yancheng Teachers University, Yancheng 224007, PR China
| | - Wan-Qian Guo
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, 73 Huanghe Road, Harbin, Heilongjiang 150090, PR China.
| | - Qu-Li Wu
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, 73 Huanghe Road, Harbin, Heilongjiang 150090, PR China
| | - Nan-Qi Ren
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, 73 Huanghe Road, Harbin, Heilongjiang 150090, PR China
| | - Jo-Shu Chang
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, 73 Huanghe Road, Harbin, Heilongjiang 150090, PR China; Department of Chemical Engineering, National Cheng Kung University, Tainan 701, Taiwan; Research Center for Energy Technology and Strategy Center, National Cheng Kung University, Tainan 701, Taiwan
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204
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Peng S, Dolfing J, Feng Y, Wang Y, Lin X. Enrichment of the Antibiotic Resistance Gene tet(L) in an Alkaline Soil Fertilized With Plant Derived Organic Manure. Front Microbiol 2018; 9:1140. [PMID: 29904377 PMCID: PMC5990627 DOI: 10.3389/fmicb.2018.01140] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2017] [Accepted: 05/14/2018] [Indexed: 12/17/2022] Open
Abstract
Fifteen antibiotic resistance genes (ARGs) and intI1, a gene involved in horizontal gene transfer (HGT) of ARGs, were quantified in three different soil samples from a 22 year old field experiment that had received inorganic fertilizer (NPK), organic manure (OM; a mixture of wheat straw, soybean oil cake and cotton cake), and control fields that had received no fertilizer and manure (CK). Tet(L) was the most abundant ARG in OM, which also contained considerable levels of intI1. Molecular analysis of yearly collected archived soils over the past 22 years showed that tet(L) and intI1 were higher in OM soils than in NPK soils. The relative abundance of tet(L) was essentially constant during these years, while the level of intI1 in OM soils decreased over time. The main genotype of tet(L) was the same in archived and in fresh soil, OM, and irrigation water. Phylogenetic analysis of the 16S rRNA genes of tetracycline-resistant bacteria (TRB) isolates indicated that the Firmucutes carrying tet(L) in OM were similar to those in the OM soil, suggesting that OM transferred TRB into the OM soils where they survived. Almost all of the TRB isolated from OM carried tet(L) and belonged to the Firmicutes. Survival of bacteria from the organic manure that carried tet(L) may be the cause of the increased level of tet(L) in OM soil.
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Affiliation(s)
- Shuang Peng
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, China.,College of Environment and Ecology, Jiangsu Open University, Nanjing, China
| | - Jan Dolfing
- School of Engineering, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Youzhi Feng
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, China
| | - Yiming Wang
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, China
| | - Xiangui Lin
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, China
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205
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Zheng J, Zhou Z, Wei Y, Chen T, Feng W, Chen H. High-throughput profiling of seasonal variations of antibiotic resistance gene transport in a peri-urban river. ENVIRONMENT INTERNATIONAL 2018; 114:87-94. [PMID: 29499451 DOI: 10.1016/j.envint.2018.02.039] [Citation(s) in RCA: 129] [Impact Index Per Article: 21.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2017] [Revised: 02/23/2018] [Accepted: 02/23/2018] [Indexed: 06/08/2023]
Abstract
The rapid expansion of human activity in a region can exacerbate human health risks induced by antibiotic resistance genes (ARGs). Peri-urban ecosystems serve at the symbiotic interface between urban and rural ecosystems, and investigations into the dissemination of ARGs in peri-urban areas provide a basic framework for tracking the spread of ARGs and potential mitigations. In this study, through the use of high-throughput quantitative PCR and 16S rRNA gene high-throughput sequencing, seasonal and geographical distributions of ARGs and their host bacterial communities were characterized in a peri-urban river. The abundance of ARGs in downstream was 5.2-33.9 times higher than upstream, which indicated distinct antibiotic resistance pollution in the areas where human lives. With the comparison classified based on land use nearby, the abundance of ARGs in samples near farmland and villages was higher than in the background (3.47-5.58 times), pointing to the high load in the river caused by farming and other human activities in the peri-urban areas. With the co-occurrence pattern revealed by network analysis, blaVEB and tetM were proposed to be indicators of ARGs which get together in the same module. Furthermore, seasonal variations in ARGs and the transport of bacterial communities were observed. The effects of seasonal temperature on the dissemination of ARGs along the watershed was also evaluated. The highest absolute abundance of ARGs occurred in summer (2.81 × 109 copies/L on average), the trends of ARG abundances in four seasons were similar with local air temperature. The Linear discriminant analysis effect size (LEfSe) suggested that nine bacterial genera were implicated as biomarkers for the corresponding season. Mobile genetic elements (MGEs) showed significant positive correlation with ARGs (P < 0.01) and MGEs were also identified as the key-contributing factor driving ARG alteration. This study provides an overview of seasonal and geographical variations in ARGs distribution in a peri-urban river and draws attention to controlling pollutants in peri-urban ecosystems.
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Affiliation(s)
- Ji Zheng
- Department of Environmental Engineering, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Zhenchao Zhou
- Department of Environmental Engineering, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Yuanyuan Wei
- Department of Environmental Engineering, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Tao Chen
- Department of Environmental Engineering, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Wanqiu Feng
- Department of Environmental Engineering, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Hong Chen
- Department of Environmental Engineering, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China.
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206
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Coertze RD, Bezuidenhout CC. The prevalence and diversity of AmpC β-lactamase genes in plasmids from aquatic systems. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2018; 2017:603-611. [PMID: 29851413 DOI: 10.2166/wst.2018.188] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
This study aimed to investigate the presence and diversity of AmpC β-lactamase and integrase genes among DNA (genomic and plasmid) from bacterial populations in selected aquatic systems. Following an enrichment step, DNA was isolated and subjected to polymerase chain reaction (PCR) and digital droplet PCR. The intI1 gene and AmpC β-lactamase genes were present in genomic and plasmid DNA from all sites in the Mooi, Crocodile and Marico Rivers, with the exception of intI1 in the Marico River. Digital droplet PCR demonstrated that copy numbers varied considerably (0.0 to 29.38 copies per picogram of DNA). Some samples in which ampC was not detected, intI1 was present. Amplicons of ampC genes were subjected to restriction digest using HindIII. Samples where the restriction markers were absent were purified by cloning followed by plasmid extraction, PCR amplification, and sequencing of individual AmpC gene fragments. Phylogenetic analysis identified all positive AmpC genes as Class C β-lactamases, comprising of ampC, CMY- and ACT-families. Detecting AmpC and intl1 genes on plasmids suggests a high risk of horizontal gene transfer and potential dissemination of these and other antibiotic resistance genes surrounding immediate aquatic environments. Consequences of β-lactamase diversity in aquatic ecosystems are relatively unexplored in South African aquatic ecosystems.
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Affiliation(s)
- Roelof Dirk Coertze
- Unit for Environmental Science and Management: Microbiology, North-West University: Potchefstroom Campus, Private Bag X6001, Potchefstroom 2520, South Africa E-mail:
| | - Cornelius Carlos Bezuidenhout
- Unit for Environmental Science and Management: Microbiology, North-West University: Potchefstroom Campus, Private Bag X6001, Potchefstroom 2520, South Africa E-mail:
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207
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Impact of Wastewater Treatment on the Prevalence of Integrons and the Genetic Diversity of Integron Gene Cassettes. Appl Environ Microbiol 2018; 84:AEM.02766-17. [PMID: 29475864 DOI: 10.1128/aem.02766-17] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2017] [Accepted: 02/10/2018] [Indexed: 12/23/2022] Open
Abstract
The integron platform allows the acquisition, expression, and dissemination of antibiotic resistance genes within gene cassettes. Wastewater treatment plants (WWTPs) contain abundant resistance genes; however, knowledge about the impacts of wastewater treatment on integrons and their gene cassettes is limited. In this study, by using clone library analysis and high-throughput sequencing, we investigated the abundance of class 1, 2, and 3 integrons and their corresponding gene cassettes in three urban WWTPs. Our results showed that class 1 integrons were most abundant in WWTPs and that wastewater treatment significantly reduced the abundance of all integrons. The WWTP influents harbored the highest diversity of class 1 integron gene cassettes, whereas class 3 integron gene cassettes exhibited highest diversity in activated sludge. Most of the gene cassette arrays detected in class 1 integrons were novel. Aminoglycoside, beta-lactam, and trimethoprim resistance genes were highly prevalent in class 1 integron gene cassettes, while class 3 integrons mainly carried beta-lactam resistance gene cassettes. A core class 1 integron resistance gene cassette pool persisted during wastewater treatment, implying that these resistance genes could have high potential to spread into environments through WWTPs. These data provide new insights into the impact of wastewater treatment on integron pools and highlight the need for surveillance of resistance genes within both class 1 and 3 integrons.IMPORTANCE Wastewater treatment plants represent a significant sink and transport medium for antibiotic resistance bacteria and genes spreading into environments. Integrons are important genetic elements involved in the evolution of antibiotic resistance. To better understand the impact of wastewater treatment on integrons and their gene cassette contexts, we conducted clone library construction and high-throughput sequencing to analyze gene cassette contexts for class 1 and class 3 integrons during the wastewater treatment process. This study comprehensively profiled the distribution of integrons and their gene cassettes (especially class 3 integrons) in influents, activated sludge, and effluents of conventional municipal wastewater treatment plants. We further demonstrated that while wastewater treatment significantly reduced the abundance of integrons and the diversity of associated gene cassettes, a large fraction of integrons persisted in wastewater effluents and were consequentially discharged into downstream natural environments.
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208
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Abundances of Clinically Relevant Antibiotic Resistance Genes and Bacterial Community Diversity in the Weihe River, China. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2018; 15:ijerph15040708. [PMID: 29642605 PMCID: PMC5923750 DOI: 10.3390/ijerph15040708] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/03/2018] [Revised: 03/30/2018] [Accepted: 04/07/2018] [Indexed: 12/17/2022]
Abstract
The spread of antibiotic resistance genes in river systems is an emerging environmental issue due to their potential threat to aquatic ecosystems and public health. In this study, we used droplet digital polymerase chain reaction (ddPCR) to evaluate pollution with clinically relevant antibiotic resistance genes (ARGs) at 13 monitoring sites along the main stream of the Weihe River in China. Six clinically relevant ARGs and a class I integron-integrase (intI1) gene were analyzed using ddPCR, and the bacterial community was evaluated based on the bacterial 16S rRNA V3–V4 regions using MiSeq sequencing. The results indicated Proteobacteria, Actinobacteria, Cyanobacteria, and Bacteroidetes as the dominant phyla in the water samples from the Weihe River. Higher abundances of blaTEM, strB, aadA, and intI1 genes (103 to 105 copies/mL) were detected in the surface water samples compared with the relatively low abundances of strA, mecA, and vanA genes (0–1.94 copies/mL). Eight bacterial genera were identified as possible hosts of the intI1 gene and three ARGs (strA, strB, and aadA) based on network analysis. The results suggested that the bacterial community structure and horizontal gene transfer were associated with the variations in ARGs.
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209
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Eckert EM, Di Cesare A, Kettner MT, Arias-Andres M, Fontaneto D, Grossart HP, Corno G. Microplastics increase impact of treated wastewater on freshwater microbial community. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2018; 234:495-502. [PMID: 29216487 DOI: 10.1016/j.envpol.2017.11.070] [Citation(s) in RCA: 135] [Impact Index Per Article: 22.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2017] [Revised: 11/20/2017] [Accepted: 11/21/2017] [Indexed: 06/07/2023]
Abstract
Plastic pollution is a major global concern with several million microplastic particles entering every day freshwater ecosystems via wastewater discharge. Microplastic particles stimulate biofilm formation (plastisphere) throughout the water column and have the potential to affect microbial community structure if they accumulate in pelagic waters, especially enhancing the proliferation of biohazardous bacteria. To test this scenario, we simulated the inflow of treated wastewater into a temperate lake using a continuous culture system with a gradient of concentration of microplastic particles. We followed the effect of microplastics on the microbial community structure and on the occurrence of integrase 1 (int1), a marker associated with mobile genetic elements known as a proxy for anthropogenic effects on the spread of antimicrobial resistance genes. The abundance of int1 increased in the plastisphere with increasing microplastic particle concentration, but not in the water surrounding the microplastic particles. Likewise, the microbial community on microplastic was more similar to the original wastewater community with increasing microplastic concentrations. Our results show that microplastic particles indeed promote persistence of typical indicators of microbial anthropogenic pollution in natural waters, and substantiate that their removal from treated wastewater should be prioritised.
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Affiliation(s)
- Ester M Eckert
- Microbial Ecology Group (MEG), National Research Council - Institute of Ecosystem Study (CNR-ISE), Largo Tonolli, 50, 28922 Verbania, Italy.
| | - Andrea Di Cesare
- Microbial Ecology Group (MEG), National Research Council - Institute of Ecosystem Study (CNR-ISE), Largo Tonolli, 50, 28922 Verbania, Italy; Department of Earth, Environmental and Life Sciences (DISTAV), University of Genoa, Corso Europa 26, 16132 Genoa, Italy
| | - Marie Therese Kettner
- Leibniz Institute of Freshwater Ecology and Inland Fisheries (IGB), Dept. Experimental Limnology, Alte Fischerhuette 2, D-16775 Stechlin, Germany; Potsdam University, Inst. of Biochemistry and Biology, Maulbeerallee 2, D-14469 Potsdam, Germany
| | - Maria Arias-Andres
- Leibniz Institute of Freshwater Ecology and Inland Fisheries (IGB), Dept. Experimental Limnology, Alte Fischerhuette 2, D-16775 Stechlin, Germany; Potsdam University, Inst. of Biochemistry and Biology, Maulbeerallee 2, D-14469 Potsdam, Germany; Central American Institute for Studies on Toxic Substances (IRET), Universidad Nacional, Campus Omar Dengo, P.O. Box 86-3000, Heredia, Costa Rica
| | - Diego Fontaneto
- Microbial Ecology Group (MEG), National Research Council - Institute of Ecosystem Study (CNR-ISE), Largo Tonolli, 50, 28922 Verbania, Italy
| | - Hans-Peter Grossart
- Leibniz Institute of Freshwater Ecology and Inland Fisheries (IGB), Dept. Experimental Limnology, Alte Fischerhuette 2, D-16775 Stechlin, Germany; Potsdam University, Inst. of Biochemistry and Biology, Maulbeerallee 2, D-14469 Potsdam, Germany
| | - Gianluca Corno
- Microbial Ecology Group (MEG), National Research Council - Institute of Ecosystem Study (CNR-ISE), Largo Tonolli, 50, 28922 Verbania, Italy
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210
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Jang HM, Kim YB, Choi S, Lee Y, Shin SG, Unno T, Kim YM. Prevalence of antibiotic resistance genes from effluent of coastal aquaculture, South Korea. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2018; 233:1049-1057. [PMID: 29031406 DOI: 10.1016/j.envpol.2017.10.006] [Citation(s) in RCA: 98] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2017] [Revised: 09/01/2017] [Accepted: 10/03/2017] [Indexed: 06/07/2023]
Abstract
The wide use of antibiotics in aquaculture for prophylactic and therapeutic purposes can potentially lead to the prevalence of antibiotic resistance genes (ARGs). This study reports for the first time the profile of ARGs from effluents of coastal aquaculture located in South Jeolla province and Jeju Island, South Korea. Using quantitative PCR (qPCR), twenty-two ARGs encoding tetracycline resistance (tetA, tetB, tetD, tetE, tetG, tetH, tetM, tetQ, tetX, tetZ, tetBP), sulfonamide resistance (sul1, sul2), quinolone resistance (qnrD, qnrS, aac(6')-Ib-cr), β-lactams resistance (blaTEM, blaCTX, blaSHV), macrolide resistance (ermC), florfenicol resistance (floR) and multidrug resistance (oqxA) and a class 1 integrons-integrase gene (intI1) were quantified. In addition, Illumina Miseq sequencing was applied to investigate microbial community differences across fish farm effluents. Results from qPCR showed that the total number of detected ARGs ranged from 4.24 × 10-3 to 1.46 × 10-2 copies/16S rRNA gene. Among them, tetB and tetD were predominant, accounting for 74.8%-98.0% of the total ARGs. Furthermore, intI1 gene showed positive correlation with tetB, tetD, tetE, tetH, tetX, tetZ tetQ and sul1. Microbial community analysis revealed potential host bacteria for ARGs and intI1. Two genera, Vibrio and Marinomonas belonging to Gammaproteobacteria, showed significant correlation with tetB and tetD, the most dominant ARGs in all samples. Also, operational taxonomic units (OTUs)-based network analysis revealed that ten OTUs, classified into the phyla Proteobacteria, Cyanobacteria/Chloroplast, Bacteroidetes, Verrucomicrobia and an unclassified phylum, were potential hosts of tetracycline resistance genes (i.e., tetA, tetG, tetH, tetM, tetQ and tetZ). Further systematic monitoring of ARGs is warranted for risk assessment and management of antibacterial resistance from fish farm effluents.
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Affiliation(s)
- Hyun Min Jang
- School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology, Buk-gu, Gwangju 500-712, South Korea
| | - Young Beom Kim
- School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology, Buk-gu, Gwangju 500-712, South Korea
| | - Sangki Choi
- School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology, Buk-gu, Gwangju 500-712, South Korea
| | - Yunho Lee
- School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology, Buk-gu, Gwangju 500-712, South Korea
| | - Seung Gu Shin
- Department of Energy Engineering, Gyeongnam National University of Science and Technology, Jinju, Gyeongnam, South Korea
| | - Tatsuya Unno
- Faculty of Biotechnology, College of Applied Life Sciences, SARI, Jeju National University, Jeju 690-756, South Korea
| | - Young Mo Kim
- School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology, Buk-gu, Gwangju 500-712, South Korea.
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211
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Burch TR, Sadowsky MJ, LaPara TM. Effect of Different Treatment Technologies on the Fate of Antibiotic Resistance Genes and Class 1 Integrons when Residual Municipal Wastewater Solids are Applied to Soil. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2017; 51:14225-14232. [PMID: 29148730 DOI: 10.1021/acs.est.7b04760] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Residual wastewater solids are a significant reservoir of antibiotic resistance genes (ARGs). While treatment technologies can reduce ARG levels in residual wastewater solids, the effects of these technologies on ARGs in soil during subsequent land-application are unknown. In this study we investigated the use of numerous treatment technologies (air drying, aerobic digestion, mesophilic anaerobic digestion, thermophilic anaerobic digestion, pasteurization, and alkaline stabilization) on the fate of ARGs and class 1 integrons in wastewater solids-amended soil microcosms. Six ARGs [erm(B), qnrA, sul1, tet(A), tet(W), and tet(X)], the integrase gene of class 1 integrons (intI1), and 16S rRNA genes were quantified using quantitative polymerase chain reaction. The quantities of ARGs and intI1 decreased in all microcosms, but thermophilic anaerobic digestion, alkaline stabilization, and pasteurization led to the most extensive decay of ARGs and intI1, often to levels similar to that of the control microcosms to which no wastewater solids had been applied. In contrast, the rates by which ARGs and intI1 declined using the other treatment technologies were generally similar, typically varying by less than 2 fold. These results demonstrate that wastewater solids treatment technologies can be used to decrease the persistence of ARGs and intI1 during their subsequent application to soil.
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Affiliation(s)
- Tucker R Burch
- Department of Civil, Environmental, and Geo- Engineering, University of Minnesota , Minneapolis, Minnesota 55455, United States
| | - Michael J Sadowsky
- Biotechnology Institute, University of Minnesota , St. Paul, Minnesota 55108, United States
- Department of Soil, Water, and Climate, University of Minnesota , St. Paul, Minnesota 55108, United States
- Department of Plant and Microbial Biology, University of Minnesota , St. Paul, Minnesota 55108, United States
| | - Timothy M LaPara
- Department of Civil, Environmental, and Geo- Engineering, University of Minnesota , Minneapolis, Minnesota 55455, United States
- Biotechnology Institute, University of Minnesota , St. Paul, Minnesota 55108, United States
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212
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Auguet O, Pijuan M, Borrego CM, Rodriguez-Mozaz S, Triadó-Margarit X, Giustina SVD, Gutierrez O. Sewers as potential reservoirs of antibiotic resistance. THE SCIENCE OF THE TOTAL ENVIRONMENT 2017; 605-606:1047-1054. [PMID: 28709370 DOI: 10.1016/j.scitotenv.2017.06.153] [Citation(s) in RCA: 74] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2017] [Revised: 06/19/2017] [Accepted: 06/19/2017] [Indexed: 05/06/2023]
Abstract
Wastewater transport along sewers favors the colonization of inner pipe surfaces by wastewater-derived microorganisms that grow forming biofilms. These biofilms are composed of rich and diverse microbial communities that are continuously exposed to antibiotic residues and antibiotic resistant bacteria (ARB) from urban wastewater. Sewer biofilms thus appear as an optimal habitat for the dispersal and accumulation of antibiotic resistance genes (ARGs). In this study, the concentration of antibiotics, integron (intI1) and antibiotic resistance genes (qnrS, sul1, sul2, blaTEM, blaKPC, ermB, tetM and tetW), and potential bacterial pathogens were analyzed in wastewater and biofilm samples collected at the inlet and outlet sections of a pressurized sewer pipe. The most abundant ARGs detected in both wastewater and biofilm samples were sul1 and sul2 with roughly 1 resistance gene for each 10 copies of 16s RNA gene. Significant differences in the relative abundance of gene intI1 and genes conferring resistance to fluoroquinolones (qnrS), sulfonamides (sul1 and sul2) and betalactams (blaTEM) were only measured between inlet and outlet biofilm samples. Composition of bacterial communities also showed spatial differences in biofilms and a higher prevalence of Operational Taxonomic Units (OTUs) with high sequence identity (>98%) to well-known human pathogens was observed in biofilms collected at the inlet pipe section. Our study highlights the role of sewer biofilms as source and sink of ARB and ARGs and supports the idea that community composition rather than antibiotic concentration is the main factor driving the diversity of the sewage resistome.
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Affiliation(s)
- Olga Auguet
- Catalan Institute for Water Research (ICRA), Scientific and Technologic Park of the University of Girona, Emili Grahit 101, 17003 Girona, Spain
| | - Maite Pijuan
- Catalan Institute for Water Research (ICRA), Scientific and Technologic Park of the University of Girona, Emili Grahit 101, 17003 Girona, Spain
| | - Carles M Borrego
- Catalan Institute for Water Research (ICRA), Scientific and Technologic Park of the University of Girona, Emili Grahit 101, 17003 Girona, Spain; Group of Molecular Microbial Ecology, Institute of Aquatic Ecology, University of Girona, Girona, Spain
| | - Sara Rodriguez-Mozaz
- Catalan Institute for Water Research (ICRA), Scientific and Technologic Park of the University of Girona, Emili Grahit 101, 17003 Girona, Spain
| | - Xavier Triadó-Margarit
- Group of Molecular Microbial Ecology, Institute of Aquatic Ecology, University of Girona, Girona, Spain; Integrative Freshwater Ecology Group, Centre d'Estudis Avançats de Blanes, CEAB-CSIC, Accés Cala Sant Francesc, 14, 17300, Blanes, Girona, Spain
| | - Saulo Varela Della Giustina
- Catalan Institute for Water Research (ICRA), Scientific and Technologic Park of the University of Girona, Emili Grahit 101, 17003 Girona, Spain
| | - Oriol Gutierrez
- Catalan Institute for Water Research (ICRA), Scientific and Technologic Park of the University of Girona, Emili Grahit 101, 17003 Girona, Spain.
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213
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Vikesland PJ, Pruden A, Alvarez PJJ, Aga D, Bürgmann H, Li XD, Manaia CM, Nambi I, Wigginton K, Zhang T, Zhu YG. Toward a Comprehensive Strategy to Mitigate Dissemination of Environmental Sources of Antibiotic Resistance. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2017; 51:13061-13069. [PMID: 28976743 DOI: 10.1021/acs.est.7b03623] [Citation(s) in RCA: 187] [Impact Index Per Article: 26.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Antibiotic resistance is a pervasive global health threat. To combat the spread of resistance, it is necessary to consider all possible sources and understand the pathways and mechanisms by which resistance disseminates. Best management practices are urgently needed to provide barriers to the spread of resistance and maximize the lifespan of antibiotics as a precious resource. Herein we advise upon the need for coordinated national and international strategies, highlighting three essential components: (1) Monitoring, (2) Risk Assessment, and (3) Mitigation of antibiotic resistance. Central to all three components is What exactly to monitor, assess, and mitigate? We address this question within an environmental framework, drawing from fundamental microbial ecological processes driving the spread of resistance.
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Affiliation(s)
- Peter J Vikesland
- Department of Civil and Environmental Engineering, Virginia Tech , Blacksburg, Virginia United States
- Virginia Tech Global Change Center and Virginia Tech Institute of Critical Technology and Applied Science, Virginia Tech , Blacksburg, Virginia United States
| | - Amy Pruden
- Department of Civil and Environmental Engineering, Virginia Tech , Blacksburg, Virginia United States
- Virginia Tech Global Change Center and Virginia Tech Institute of Critical Technology and Applied Science, Virginia Tech , Blacksburg, Virginia United States
| | - Pedro J J Alvarez
- Department of Civil and Environmental Engineering, Rice University , Houston, Texas United States
| | - Diana Aga
- Department of Chemistry, University at Buffalo , Buffalo, New York United States
| | - Helmut Bürgmann
- Eawag: Swiss Federal Institute of Aquatic Science and Technology , 6047 Kastanienbaum, Switzerland
| | - Xiang-Dong Li
- Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University , Hong Kong
| | - Celia M Manaia
- Universidade Católica Portuguesa, CBQF - Centro de Biotecnologia e Química Fina - Laboratório Associado, Escola Superior de Biotecnologia , Rua Arquiteto Lobão Vital, Apartado 2511, 4202-401 Porto, Portugal
| | - Indumathi Nambi
- Department of Civil Engineering, Indian Institute of Technology - Madras , Chennai, India
| | - Krista Wigginton
- Department of Civil and Environmental Engineering, The University of Michigan , Ann Arbor, Michigan United States
| | - Tong Zhang
- Department of Civil Engineering, Hong Kong University , Hong Kong
| | - Yong-Guan Zhu
- Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences , Xiamen 361021, China
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