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Article

Persistence and Dissemination Capacities of a blaNDM-5-Harboring IncX-3 Plasmid in Escherichia coli Isolated from an Urban River in Montpellier, France

by
Florence Hammer-Dedet
1,
Fabien Aujoulat
1,
Estelle Jumas-Bilak
2 and
Patricia Licznar-Fajardo
2,*
1
HSM, University Montpellier, CNRS, IRD, 34090 Montpellier, France
2
HSM, University of Montpellier, CNRS, IRD, CHU Montpellier, 34090 Montpellier, France
*
Author to whom correspondence should be addressed.
Antibiotics 2022, 11(2), 196; https://doi.org/10.3390/antibiotics11020196
Submission received: 31 December 2021 / Revised: 24 January 2022 / Accepted: 28 January 2022 / Published: 2 February 2022
(This article belongs to the Special Issue Carbapenemase-Producing Enterobacterales)
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Abstract

:
To investigate the capacities of persistence and dissemination of blaNDM-5 within Escherichia coli and in aquatic environment, we characterized E. coli (sequence type 636) strains B26 and B28 isolated one month apart from the same urban river in Montpellier, France. The two isolates carried a pTsB26 plasmid, which sized 45,495 Kb, harbored blaNDM-5 gene and belonged to IncX-3 incompatibility group. pTsB26 was conjugative in vitro at high frequency, it was highly stable after 400 generations and it exerted no fitness cost on its host. blaNDM-5harboring plasmids are widely dispersed in E. coli all around the world, with no lineage specialization. The genomic comparison between B26 and B28 stated that the two isolates probably originated from the same clone, suggesting the persistence of pTsB26 in an E. coli host in aquatic environment.

Graphical Abstract

1. Introduction

Antimicrobial resistance (AMR) occurs worldwide and the World Health Organization has identified it as one of the three main threats to human health [1,2]. Due to the overuse and misuse of antimicrobials, selective pressure exerted on bacteria significantly enhances AMR, with consequences for antimicrobial treatments failures [3]. At first neglected, the environment is now considered as a main player in the emergence and diffusion of AMR. Water plays a major role in interconnecting different ecosystems such as humans, animals, soils and hydrosystems [4,5,6,7,8]. Urban and rural surface waters constitute hotspots for exchanges among microorganisms of human and environmental origin, which are all subject to strong selection pressures due to diverse pollutions [3,5]. β-lactams are by far the most widely consumed antibiotics worldwide [9], and among β-lactams, carbapenems are last resort treatment for multidrug-resistant bacterial infections [10,11,12]. Several studies reported the occurrence of Carbapenemase Encoding Genes (CEGs) in aquatic environments [6,7,8]. However, there is a lack of studies on the persistence and dissemination capacities of CEGs and bacteria carrying CEGs in waters.
In 2009, a New Delhi Metallo-β-lactamase-1 (NDM-1) encoding gene was first identified in a carbapenem-resistant Klebsiella pneumoniae involved in a urinary tract infection [13]. Since then, NDM-producing Enterobacterales have spread rapidly in humans and animals, and in various environments [14,15,16,17]. NDM enzymes belong to class B β-lactamases, which displays a broad lysis spectrum, hydrolyzing almost all β-lactams [7]. Until now, 29 variants of NDM have been described [18]. Several plasmids harboring blaNDM genes have been identified. Among them, plasmids of the incompatibility group IncX-3 are frequently associated with blaNDM-5 [14,19,20,21,22,23,24]. The IncX-3 plasmids group gathers self-transmissible plasmids with a narrow host spectrum restricted to Enterobacterales [25]. Characterizing these plasmids would be contributive for understanding their role in environmental AMR issue.
Several clinical, animal and environmental strains containing IncX-3 plasmids carrying blaNDM-5 have been isolated in China, South East Asian countries [26,27,28] and French urban waters [29]. Here, we described pTsB26, an IncX-3 plasmid encoding blaNDM-5 gene carried by two strains of E. coli isolated from an urban river one month apart. We studied the capacities of dissemination and persistence of pTsB26 by in vitro assays and the fitness cost associated with pTsB26 carriage. Metadata analysis was performed in order to identify common themes in blaNDM-5-harboring IncX-3 plasmids and to gain insights in IncX-3 success in E. coli population. The worldwide circulation of blaNDM-5-harboring IncX-3 plasmids in E. coli and in various environments as well as the high stability in host bacteria observed herein could explain the contribution of this type of plasmid in the global dissemination of carbapenemase genes.

2. Results

2.1. Characteristics of the Two NDM-5 Producing E. coli Isolates B26 and B28

B26 and B28 E. coli were isolated in the urban river of Font d’Aurelle, in August and September 2015, respectively. They both displayed high level of carbapenem resistance, with minimum inhibitory concentrations (MIC) over 15 mg/L for ertapenem, meropenem and imipenem.
The B26 genome is 4927 Mb and includes four plasmids belonging to IncFIA/FIB, IncFII, IncQ1 and IncX-3 incompatibility groups. The inventory of antimicrobial resistance genes identified blaNDM-5, blaTEM-1B and blaSHV-12 (previously identified as blaSHV-5 by multiplex PCR GeneXpert Cepheid). Genome of B28 is 4858 Mb, including a unique IncX-3 plasmid and blaNDM-5, was the only antimicrobial resistance gene detected.
Both isolates were affiliated to the sequence type (ST) 636 (B2 phylogroup) by in silico multilocus sequence typing. Whole-genome alignment and comparison showed no large indels. Only 21 variations between B26 and B28 genomes were identified, including 19 single nucleotide polymorphisms (SNPs) and two multi-nucleotide polymorphisms (four nucleotides). Among the 21 variations, six variations were related to hypothetic encoding sequences, four of them corresponding to synonymous mutations and two to missense mutations.

2.2. Characteristics of the blaNDM-5-Harboring IncX-3 Plasmids

Transformation assays in E. coli TOP10 with plasmids extracted from B26 and B28 were successful and gave two transformants, TsB26 and TsB28. These two transformants displayed high level of resistance to carbapenems (MIC ≥ 7.5 mg/L whatever the carbapenem). They were positive to specific PCRs anchored in pir gene (i.e., specific of IncX-3 plasmid) and blaNDM. PCR tests indicated that both transconjugants did not contain any other plasmid.
Genomic sequences of TsB26 and TsB28 were aligned and compared with those of E. coli TOP10. TsB26 presented a unique additional sequence onto a single contig corresponding to IncX-3 plasmid. The extremities of this contig were blaNDM-5 and ISAba125, corresponding to a plasmid region already sequenced [29]. Complete identity was observed between pTsB28 and pTsB26 encoding blaNDM-5 plasmids. So, the plasmid was called pTsB26 from then on. pTsB26 sizes 45,495 kb with a GC content of 46.5%. It belongs to IncX-3 plasmid incompatibility group. Nucleotide sequence analysis revealed 57 predicted open reading frames corresponding to 57 encoding genes (Figure 1). Alignment of pTsB26 with IncX3-plasmid conserved backbone, described by Liakopoulos [30], showed that pTsB26 backbone was typical of IncX-3 group. It is approximately 25 kb and includes encoding genes for replication (pir and bis), entry exclusion (eex), plasmid stability (parAB, topB and hns) and conjugative transfer (pilX1–11 and taxA-C) [30]. The accessory module of about 20 kb contains blaNDM-5, which is preceded by IS3000 and ISAba125 and followed by bleMBL (bleomycin resistance gene), trpF (N-5′phosphoribosylanthranilate isomerase), dsbD (disulfide oxidoreductase) and umuD (encoding a protein implicated in the SOS system).
BLASTn analysis showed that pTsB26 displayed nearly the same sequence (45494/45495 bp) as the plasmid pEC7-NDM-5 (accession number: MH347484) found in a E. coli strain isolated from dog in South Korea. A high homology (45475/45495 bp) was also observed with the well characterized IncX-3-blaNDM5 pEC463-NDM5 plasmid (accession number: MG545911) in an E. coli clinical strain from China [31].

2.3. Conjugative Transfer Success of pTsB26 In Vitro

Conjugative transfer rate of pTsB26 was studied by mating assays, with B26, B28, TsB26 and TsB28 as donor strains and XL1-Blue E. coli as receptor. All strains successfully transferred pTsB26, with high transfer rates (Table 1), and all transconjugant strains displayed carbapenem resistance (MIC ≥ 7.5 mg/L).

2.4. In Silico Population Study of blaNDM-5-Harboring IncX-3 Plasmids among E. coli Species

A genomes dataset was constructed with 28 complete genomes of E. coli-carrying blaNDM-5 on an IncX-3 plasmid and the genomes of B26 and B28 strains. In silico sequence types, phylotypes and metadata associated with the genomes are presented in Table 2. More than 96% of the genomes belong to A, B1 and C phylogroups. B26 and B28 were the only genomes of the B2 phylogroup in the dataset. The 31 genomes corresponded to strains isolated from diverse origins: humans (n = 20), environment (n = 6) and animals (n = 4).
In order to study the distribution of E. coli encoding blaNDM-5 on IncX-3 plasmids within the whole E. coli populations, we reconstructed genetic links by goeBURST analysis. The dataset of 30 genomes was matched with 178 776 available genomes of E. coli (11 058 STs) in the dataset EnteroBase (13 July 2021) (Figure 2). The genomes of E. coli-carrying blaNDM-5 IncX-3 plasmid spread out in 16 STs with no obvious lineage specialization. However, about half of the genomes (41.9%) belong to the CC10. This CC is a major sub-population in E. coli because it gathers 11.85% of the STs available in EnteroBase. The other genomes are scattered in the overall E. coli population structure. B26 and B28 belonged to ST636, which forms the CC636 together with 4 related STs. CC636 was relatively isolated in the E. coli population and gathers 451 strains (0.25%) of the 178,776 strains of EnteroBase.

2.5. Stability and Fitness Cost of pTsB26 on B26 and B28 E. coli

To evaluate the stability of the pTsB26 plasmid in B26 and B28, strains were passaged daily for 40 days without antibiotic selection. pTsB26 is highly stable, with more than 96% of plasmid containing cells after approximately 400 generations (Figure 3).
These assays allowed one to isolate strains without pTsB26: B26ΔpJ40 and B28ΔpJ19, respectively, isolated at day 40 and day 19 of the experiment. In parallel, two strains containing pTsB26 plasmid (B26J40a and B28J19a) were isolated the same day as B26ΔpJ40 and B28ΔpJ19. These strains, used as control, were thereafter called “LB-adapted” strains, with the letter “a” at the end of the strain name.
Growth kinetics assays were performed for the strains with (ancestral strains and LB-adapted strains) and without pTsB26 plasmid (Table 3). Growth rates of B26, B26ΔpJ40 and B26J40a did not vary significantly (p > 0.05), suggesting that the carriage of pTsB26 did not produce fitness lost for B26. Of note, B26ΔpJ19 and B26J19a contained the other plasmids IncFIA/FIB, IncFII and IncQ1 as the ancestral B26. On the other hand, growth rates of ancestral B28 or LB-adapted B28 (B28J19a) were equivalent and significantly better than observed for B28 cured for pTsB26 (p < 0.05). This last observation suggests that pTsB26 could provide fitness advantage even to its host, without selective pressure.

3. Discussion

The spread of NDM-5 variant has been extensively described in hospital environments, including hospital sewage water [32,33] and in wastewater [34]. In France, in 2020, about 20% of carbapenemase-producing enterobacteria isolated from clinical samples were NDM-producers [35]. Among them, more than 35% were NDM-5 variant. Its emergence and successful spread are worth emphasizing as this variant represented only 5% of NDMs reported in 2013, 15% in 2016 and more than 30% in 2017, with stabilization since this date [35].
Focusing on hydric environments, this variant has been found in various environments such as urban waters [29,36]; rivers and lakes [8,37]; sediments and soil [38]; and seawater [8]. Various plasmid incompatibility groups carrying blaNDM-5 have been reported, with IncX-3 and IncF being among the most prevalent [8,27,34,37,38,39,40].
Here, we report the description of the blaNDM-5 carrying plasmid pTsB26 from two E. coli ST636 isolated from an urban river in Montpellier, France [29]. IncX-3 plasmids have a narrow host spectrum restricted to Enterobacterales species [25,28,41]. Their association with antimicrobial resistance has been documented worldwide [28,41,42,43,44,45,46,47,48,49].
The involvement of IncX-3 plasmids in the dissemination of blaNDM genes was first described in the 2000′s [43]. It became quickly prevalent within Enterobacterales all around the world, with predominance in Asia [27,28,41,42,44,45,46,47,49,50]. Here, we show that blaNDM-5-harboring IncX-3 plasmids are widely disseminated in the species E. coli in all the continents, with no lineage specialization (Figure 3). This strongly suggests horizontal spread within E. coli and proves the important implication of IncX-3 plasmid in the success of blaNDM-5 gene in this species.
Only 21 variations (19 SNPs and 2 multi-nucleotide polymorphisms) were detected between B26 and B28 isolated in the same urban aquatic environment a month apart. The scarce genomic differences strongly suggest their clonal origin. Clonal strains have certainly persisted for at least one month in the river, with iterative input being highly unlikely but not excluded. This hypothesis is strongly supported by the fact that the two isolates carried the same plasmid pTsB26 (100% nucleotide identity). Interestingly, the IncFIA/FIB, IncFII and IncQ1 plasmids carried by B26 (isolated in August 2015) were absent from the genome of B28 (isolated in September 2015). Only pTsB26 has persisted in the E. coli strain isolated in September, showing that pTsB26 is stable in B26 and B28 isolates, relative to other plasmids in the same strains. This in situ observation was verified by in vitro evolution experiments, demonstrating the longtime persistence of the plasmid after 400 generations in B26 and B28 isolates (Figure 3). Several factors could explain the stability of pTsB26 in the cell lineage. First, like the other IncX-3 plasmids, pTsB26 harbors the widespread partitioning system ParAB. This system limits the number of segregant cells during cell division, ensuring the correct inheritance of the plasmid to the daughter cells [51]. Moreover, the conjugative traits of pTsB26 allow for infection of segregant cells and thus limit their number. Thus, harboring pTsB26 does not reduce the fitness of B26 and B28 (Table 3) and enhances the growth of B28. It is generally admitted that plasmids cause a fitness burden on their bacterial host [52,53,54,55] and that the plasmid could be quickly eliminated from its host. High stability of IncX-3 plasmids has already been reported in Enterobacterales transconjugant strains [28,56]. The absence of fitness cost of IncX-3 plasmids could be explained by their small size [25] and by the presence of transcriptional regulator H-NS like protein [28,30,57,58,59,60]. The observed high stability of pTsB26 has potential due to its high conjugation frequency, to a low rate of segregational loss and due to the fact it does not pass a fitness cost onto the bacterial host.
The isolates B26 and B28 are the unique representants of ST636 in the studied dataset of E. coli-carrying blaNDM-5-encoding IncX-3 plasmid (Table 2). However, in their study, Kumwenda et al. reported two E. coli ST636 clinical isolates that carried blaNDM-5 onto a plasmid not affiliated to an incompatibility group [61]. EnteroBase reported 118 isolates belonging to ST636 (Figure 3). They were isolated in different countries (all continents are represented) and in environmental and clinical samples. Other studies reported the occurrence of ST636-producing ESBLs in clinical and environmental samples [62,63,64], suggesting a generalist trait for this ST.
Persistence of strains or STs carrying CEGs on self-transmissible plasmid such as pTsB26 in aquatic environment is of concern. Aquatic environment contains diverse autochtonous bacteria, including Enterobacterales (e.g., Enterobacter sp. [65] or Raoultella sp. [66]), which can exchange and receive IncX-3 plasmids [27,28,41]. These autochtonous bacteria can constitute an environmental reservoir and shuttles for blaNDM genes. Aquatic environments are strongly linked with anthropic activities, and during recreational activities, after flood episodes or by alimentation, humans can become exposed to bacteria from aquatic environments [7,67,68,69,70]. Thus, if water contains carbapenemase-producing-bacteria such as B26 or B28 or other autochtonous bacteria, and has acquired the plasmid by horizontal gene transfer, it represents a risk for human health (i) directly by causing antimicrobial-resistant bacterial infections [71] and (ii) indirectly by participating in the dissemination of blaNDM-5 on the occasion of gut colonization [71,72], or transit. These resistant bacteria can transfer the plasmid to host microbiota bacteria, making a “shuttle” between aquatic environment and humans [7,71].
We described for the first time the in situ persistence of a blaNDM-5harboring IncX-3 self-conjugative plasmid in an E. coli lineage in an aquatic environment. This study underlines, once again, the importance of investigations into environmentally emerging, resistant bacteria. Beside genomics, testing genetic transfer and resistance stability by in vitro evolution is a proxy for diffusion and persistence in natural environment. In addition to the strategy proposed in this study, experiments of resistance genes transfer to waterborne autochthonous bacteria in microcosm would be interesting to conduct for a better description of the resistance reservoirs and the conditions influencing these reservoirs. On another hand, rapid alerts on environmentally emerging antimicrobial resistance are needed for rapid responses to resistance with public health concern. For this, efficient surveillance of AMR in environment should be undertaken. This is one of the challenges of the current national and international projects aiming to limit global AMR outbreak.

4. Materials and Methods

4.1. Escherichia coli Strains

E. coli strains B26 and B28 were isolated from water sampled at the same site of the urban river Font d’Aurelle in the city of Montpellier (N43.62711 E003.85316), France. They were isolated in August and September 2015, respectively [29].
Transformant strains, TsB26 and TsB28, were obtained by transformation experiments (see Section 4.2.).
Strains B26ΔpJ40, B28ΔpJ19, B26J40a and B28J19a were obtained during plasmid stability assays (see Section 4.3.).

4.2. Transformation and Conjugation Assays

Plasmid DNA extraction was done using the NucleoSpin Plasmid Kit (Macherey-Nagel, Allentown, PA, USA). Plasmid extracts were used for transformation assays using One Shot TOP10 chemically competent E. coli (Invitrogen, ThermoFisher Scientific, Paisley, UK) as recipient cell.
Conjugation experiments were performed using non-competent XL1-Blue E. coli MRF’, a recipient strain resistant to tetracycline and sensitive to meropenem. Briefly, donor (B26, B28 and transformants TsB26 and TsB28) and recipient strains were grown overnight at 37 °C in Luria Bertani (LB) broth supplemented (donor strains) or not (recipient strain) with ertapenem (4 mg/L). Cells were washed from antibiotic and resuspended in LB broth, and each donor strain suspension was mixed (1:1 ratio) with the receptor strain. 200 µL of each mix was deposited onto nitrocellulose membrane, itself stuck on LB agar media and incubated at 37 °C during 24 h. Transconjugants were selected by plating the bacteria from the nitrocellulose membrane onto LB agar plates supplemented with ertapenem (4 mg/L) and tetracycline (12 mg/L). The conjugative frequencies were determined by calculating the transfer rate (ratio transconjugant/donor).
The presence of blaNDM and pir (encoding the IncX-3 plasmid-specific Pir protein) in selected transconjugants and transformants was assessed by specific PCRs [14,73].

4.3. Evaluation of Plasmid Stability

Strains B26 and B28 were grown overnight at 37 °C in 10 mL of LB broth supplemented with ertapenem (4 mg/L). Bacterial cells were washed from antibiotic by centrifugation, the pellet was resuspended in 1 mL of LB broth and 10 mL of fresh LB broth without antibiotic was spiked with 10 µL of the bacterial suspension and incubated 24 h at 37 °C in a shaking water bath. Serial passages of 10 µL of overnight culture to 10 mL of fresh LB broth were done daily. One passage corresponded approximatively to 10 generations of growth. Every 50 generations, samples were diluted and plated on LB agar plates. Then, 50 colonies from each lineage were screened on LB agar plates supplemented or not with ertapenem (4mg/L) to determine the fraction of plasmid-containing cells. The lack of plasmid was confirmed by the absence of blaNDM and pir genes with specific PCRs, and these strains (B26ΔpJ40 and B28ΔpJ19) were harvested for fitness cost assays. Parallelly, strains from the same generation, carrying pTsB26 plasmid, were harvested as controls (B26J40a and B28J19a). Experiments were done in triplicate.

4.4. Fitness Cost of Plasmid Carriage

Growth of strains carrying (B26, B28, B26J40a and B28J19a) or not (B26ΔpJ40 and B28ΔpJ19) pTsB26 plasmid were measured at 37 °C in LB broth without antibiotics using a CLARIOstar Plus microplate reader (BMG, Labtech). Every 15 min, the microplate was shacked at 200 rpm during 20 s, and optical density was measured at 600 nm. Growth rates were calculated according to Sandegren et al. [74].

4.5. Carbapenem Susceptibility Testing

Susceptibility to carbapenems of B26, B28, TsB26, TsB28, B26J40a, B28J19a, B26ΔpJ40 and B281ΔpJ19 was assessed by determining the Minimal Inhibitory Concentration (MIC) in liquid media [75] for ertapenem, meropenem and imipenem. E. coli strain ATCC 25922 was used as control strain, as recommended by the CA-SFM (https://www.sfm-microbiologie.org/2021/04/23/casfm-avril-2021-v1-0/, accessed on 28 September 2021).

4.6. In Silico Analysis

4.6.1. DNA Extraction and Whole-Genome Sequencing

Genomic DNA of B26, B28, TsB26, TsB28 and E. coli TOP10 was extracted using the MasterPure™ purification kit (Lucigen, Middleton, WI, USA). High-throughput genome sequencing was carried out at the Plateforme de Microbiologie Mutualisée (P2M, Institut Pasteur, Paris, France). DNAs were processed for sequencing with Illumina systems (libraries using the Nextera XT DNA Library Prep kit and sequencing with the NextSeq 500 system). Paired-end reads were submitted to pre-processing using fqCleaner and to de novo assembly using SPAdes v3.12.0 [76] with k-mer lengths 21, 33, 55 and 77. The raw data and assemblies have been deposited in GenBank under the BioProject accession number PRJNA796954.

4.6.2. Genotyping Methods

B26 and B28 strains were genotyped by Clermont typing [77] using the in silico tool EzClermont [78] and by MultiLocus Sequence Typing (MLST) using the Achtman scheme (https://pubmlst.org/data, accessed on 28 September 2021).

4.6.3. Plasmid Sequence and Annotation

The sequence of the plasmid pTsB26 was deduced from the alignment of the genomes of TsB26 and TsB28 with that of E. coli TOP10 using the ProgressiveMauve algorithm of Mauve software [79]. Identification of plasmid incompatibility group was done with PlasmidFinder [80]. Plasmid annotation was performed with Prokka v1.14.6 [81] with default parameters through the Galaxy platform (v4.6.0 + galaxy0) [82], and the plasmid sequence was manually curated; plasmid-specific genes were named according to Thomas et al. recommendations [83].
For ORF annotation as hypothetical protein, functional prediction was performed with default settings using NCBI BLASTp [84], InterProScan [85] and Pfam [86] servers. Identification of antimicrobial resistance genes was done using ResFinder 4.1 [87]. pTsB26 representation was done using genomeVx [88].

4.6.4. Comparative Genomics of B26 and B28 Genomes

Genomes of B26 and B28 were first aligned with the ProgressiveMauve algorithm of Mauve software. Snippy v4.6.0 (https://github.com/tseemann/snippy, accessed on 20 November 2021) was used to detect both substitutions and insertions/deletions (indels) between B26 and B28 genomes. Snippy was run on the Galaxy platform (v4.6.0 + galaxy0) [82] with the default parameters.

4.6.5. Distribution of IncX3-blaNDM Plasmids in E. coli Population

In order to select E. coli genomes carrying blaNDM-5 on an IncX3 plasmid, complete genomes available on NCBI database (6 April 2021) were investigated using BLASTn tool [84]. blaNDM-5 and pir gene of pTsB26 sequences were used, and genomes carrying the 2 genes (minimum homology 100% and 92%, respectively) on the same replicon were selected. Metadata associated with each genome were collected, and ST were determined in silico using the MLST 2.0 [89]. STs (Achtman MLST scheme) associated with selected genomes and B26 and B28 strains were compared to general E. coli population using EnteroBase database [90] (178,776 strains the 13 July 2021) and the goesBURST algorithm (single locus variant level) of PHYLOViZ 2.0 software [91]. Plasmid homologies were determined by BLASTn analysis [84] against the NCBI nr/nt database with default parameters.

4.7. Statistical Assays

Statistical analysis of growth rates was performed using Student’s t-test. All statistics were made using the GraphPad Prism software V 5.03. Test results were considered as statistically significant when the associated p-value was less than 0.05.

Author Contributions

F.H.-D. conceptualized and conducted the in vitro and in silico studies, carried out the statistical analysis, wrote the manuscript and designed all tables and Figures. F.A. brought his expertise in bioinformatics tools and participated in the in silico study. P.L.-F. and E.J.-B. reviewed the manuscript. All authors have read and agreed to the published version of the manuscript.

Funding

This research received no external funding.

Institutional Review Board Statement

Not applicable.

Informed Consent Statement

Not applicable.

Acknowledgments

We acknowledge the Institute of Biomolecules Max Mousseron for the loan of their equipment, particularly Morgan Pellerano for his welcoming manner, his availability and his explanations. We acknowledge the UNESCO water-related Centre ICIReWARD ‘International Center for Interdisciplinary Research on Water Systems Dynamics’ that supports the study.

Conflicts of Interest

The authors declare no conflict of interest.

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Antibiotics 11 00196 g001 550
Figure 1. pTsB26 plasmid representation.
Figure 1. pTsB26 plasmid representation.
Antibiotics 11 00196 g001
Antibiotics 11 00196 g002 550
Figure 2. goeBURST diagram of E. coli genomes carrying a blaNDM-5 encoding IncX-3 plasmid within a global population of E. coli established on 178 776 strains available in the EnteroBase database. Each node corresponds to a Sequence Type (ST). The size of the node is scaled to the number of genomes of that ST. Nodes linked between them present one allele in common among the 7 genes considered in the MultiLocus Sequence Type scheme. Red nodes correspond to STs for which genomes with a blaNDM-5 encoding IncX-3 plasmid was identified; the proportion in the ST of genomes containing the plasmid is noted in parentheses.
Figure 2. goeBURST diagram of E. coli genomes carrying a blaNDM-5 encoding IncX-3 plasmid within a global population of E. coli established on 178 776 strains available in the EnteroBase database. Each node corresponds to a Sequence Type (ST). The size of the node is scaled to the number of genomes of that ST. Nodes linked between them present one allele in common among the 7 genes considered in the MultiLocus Sequence Type scheme. Red nodes correspond to STs for which genomes with a blaNDM-5 encoding IncX-3 plasmid was identified; the proportion in the ST of genomes containing the plasmid is noted in parentheses.
Antibiotics 11 00196 g002
Antibiotics 11 00196 g003 550
Figure 3. Stability of pTsB26 in B26 and B28.
Figure 3. Stability of pTsB26 in B26 and B28.
Antibiotics 11 00196 g003
Table
Table 1. Conjugative transfer rates of pTsB26 from different donor strains to Escherichia coli XL1-Blue receptor.
Table 1. Conjugative transfer rates of pTsB26 from different donor strains to Escherichia coli XL1-Blue receptor.
Donor StrainsConjugative Frequency
B262.09 × 10−3
B284.81 × 10−4
TsB263.52 × 10−3
TsB283.76 × 10−3
Table
Table 2. Characteristics of E. coli genomes carrying a blaNDM-5 IncX-3 plasmid.
Table 2. Characteristics of E. coli genomes carrying a blaNDM-5 IncX-3 plasmid.
StrainAccession
Number		STPhylotypeCountrySource TypeSource Niche Year
CRE1493 CP019071167AChinarectal swabhomo sapiens2013
165 CP020509101B1USAabdominalhomo sapiens2015
CREC-591 CP024821101B1South Koreaperitoneal fluidhomo sapiens2015
WCHEC025943 CP027205410CChinawastewaterenvironment2017
WCHEC005784CP028578617AChinarectal swabhomo sapiens2014
135CP02863211ECanadaNAlivestock2006
ECCRA-119 CP029242156B1Chinastoolsdog2017
CH613 MCRE0100000110AChinaurinehomo sapiens2015
GSH8M-2 NZ_AP019675542AJapanwastewater treatment plantenvironment2018
WP8-S18-CRE-02 NZ_AP022245542AJapanwastewater treatment plantenvironment2018
TUM18781 NZ_AP0232052040B1JapanNAhomo sapiens2018
YJ3 NZ_AP02322610AMyanmastoolshomo sapiens2018
WCHEC005237 NZ_CP026580167AChinarectal swabhomo sapiens2014
SCEC020001 NZ_CP032426410CChinaurinary tracthomo sapiens2016
SCEC020022 NZ_CP032892156B1Chinastoolshomo sapiens2016
WCHEC020031 NZ_CP033401410CChinaNAhomo sapiens2016
L37 NZ_CP03458948AChinarectal swabhomo sapiens2018
L65 NZ_CP0347383076B1ChinaNAhomo sapiens2018
SCEC020026 NZ_CP034958410CChinaNAhomo sapiens2016
WCHEC020032 NZ_CP034966410CChinaNAhomo sapiens2016
WCHEC025970 NZ_CP036177167AChinaNAhomo sapiens2017
L725 NZ_CP0362022161B1Chinastoolshomo sapiens2018
EC-129 NZ_CP038453167AJapansputumhomo sapiens2018
GZ04-0086 NZ_CP04233644AChinastoolshomo sapiens2018
GZEC065 NZ_CP048025156B1Chinabloodhomo sapiens2017
pV11-19-E11-025-038 NZ_CP0490501721ASouth KoreaNAdog2019
3R NZ_CP049348156B1ChinaNApoultry2015
SFE8 NZ_CP051219533B1Chinastoolspork2019
B26B26636B2Franceurban waterenvironment2015
B28B28636B2Franceurban waterenvironment2015
ST, Sequence Type; NA, Not Available.
Table
Table 3. Growth rates of strains with and without the pTsB26 plasmid.
Table 3. Growth rates of strains with and without the pTsB26 plasmid.
Strainµmax (h−1) (±sd)
B260.43351667 (±0.02560949) a
B26ΔpJ400.4441375 (±0.02775884) a
B26J40a0.44380714 (±0.03785335) a
B280.43683889 (±0.0217273) a, b
B28ΔpJ190.40048824 (±0.0333677) c
B28J19a0.43095 (±0.03460016) a, b
sd, standard deviation; values with a different letter (a,b,c) are significantly different at p < 0.05 (Student’s t-test).
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Hammer-Dedet, F.; Aujoulat, F.; Jumas-Bilak, E.; Licznar-Fajardo, P. Persistence and Dissemination Capacities of a blaNDM-5-Harboring IncX-3 Plasmid in Escherichia coli Isolated from an Urban River in Montpellier, France. Antibiotics 2022, 11, 196. https://doi.org/10.3390/antibiotics11020196

AMA Style

Hammer-Dedet F, Aujoulat F, Jumas-Bilak E, Licznar-Fajardo P. Persistence and Dissemination Capacities of a blaNDM-5-Harboring IncX-3 Plasmid in Escherichia coli Isolated from an Urban River in Montpellier, France. Antibiotics. 2022; 11(2):196. https://doi.org/10.3390/antibiotics11020196

Chicago/Turabian Style

Hammer-Dedet, Florence, Fabien Aujoulat, Estelle Jumas-Bilak, and Patricia Licznar-Fajardo. 2022. "Persistence and Dissemination Capacities of a blaNDM-5-Harboring IncX-3 Plasmid in Escherichia coli Isolated from an Urban River in Montpellier, France" Antibiotics 11, no. 2: 196. https://doi.org/10.3390/antibiotics11020196

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