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Ghaly TM, Gillings MR, Rajabal V, Paulsen IT, Tetu SG. Horizontal gene transfer in plant microbiomes: integrons as hotspots for cross-species gene exchange. Front Microbiol 2024; 15:1338026. [PMID: 38741746 PMCID: PMC11089894 DOI: 10.3389/fmicb.2024.1338026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Accepted: 04/08/2024] [Indexed: 05/16/2024] Open
Abstract
Plant microbiomes play important roles in plant health and fitness. Bacterial horizontal gene transfer (HGT) can influence plant health outcomes, driving the spread of both plant growth-promoting and phytopathogenic traits. However, community dynamics, including the range of genetic elements and bacteria involved in this process are still poorly understood. Integrons are genetic elements recently shown to be abundant in plant microbiomes, and are associated with HGT across broad phylogenetic boundaries. They facilitate the spread of gene cassettes, small mobile elements that collectively confer a diverse suite of adaptive functions. Here, we analysed 5,565 plant-associated bacterial genomes to investigate the prevalence and functional diversity of integrons in this niche. We found that integrons are particularly abundant in the genomes of Pseudomonadales, Burkholderiales, and Xanthomonadales. In total, we detected nearly 9,000 gene cassettes, and found that many could be involved in plant growth promotion or phytopathogenicity, suggesting that integrons might play a role in bacterial mutualistic or pathogenic lifestyles. The rhizosphere was enriched in cassettes involved in the transport and metabolism of diverse substrates, suggesting that they may aid in adaptation to this environment, which is rich in root exudates. We also found that integrons facilitate cross-species HGT, which is particularly enhanced in the phyllosphere. This finding may provide an ideal opportunity to promote plant growth by fostering the spread of genes cassettes relevant to leaf health. Together, our findings suggest that integrons are important elements in plant microbiomes that drive HGT, and have the potential to facilitate plant host adaptation.
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Affiliation(s)
- Timothy M. Ghaly
- School of Natural Sciences, Macquarie University, Sydney, NSW, Australia
| | | | - Vaheesan Rajabal
- School of Natural Sciences, Macquarie University, Sydney, NSW, Australia
- ARC Centre of Excellence in Synthetic Biology, Sydney, NSW, Australia
| | - Ian T. Paulsen
- School of Natural Sciences, Macquarie University, Sydney, NSW, Australia
- ARC Centre of Excellence in Synthetic Biology, Sydney, NSW, Australia
| | - Sasha G. Tetu
- School of Natural Sciences, Macquarie University, Sydney, NSW, Australia
- ARC Centre of Excellence in Synthetic Biology, Sydney, NSW, Australia
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Peng D, Wang Z, Tian J, Wang W, Guo S, Dai X, Yin H, Li L. Phyllosphere bacterial community dynamics in response to bacterial wildfire disease: succession and interaction patterns. FRONTIERS IN PLANT SCIENCE 2024; 15:1331443. [PMID: 38533399 PMCID: PMC10963427 DOI: 10.3389/fpls.2024.1331443] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/01/2023] [Accepted: 02/08/2024] [Indexed: 03/28/2024]
Abstract
Plants interact with complex microbial communities in which microorganisms play different roles in plant development and health. While certain microorganisms may cause disease, others promote nutrient uptake and resistance to stresses through a variety of mechanisms. Developing plant protection measures requires a deeper comprehension of the factors that influence multitrophic interactions and the organization of phyllospheric communities. High-throughput sequencing was used in this work to investigate the effects of climate variables and bacterial wildfire disease on the bacterial community's composition and assembly in the phyllosphere of tobacco (Nicotiana tabacum L.). The samples from June (M1), July (M2), August (M3), and September (M4) formed statistically separate clusters. The assembly of the whole bacterial population was mostly influenced by stochastic processes. PICRUSt2 predictions revealed genes enriched in the M3, a period when the plant wildfire disease index reached climax, were associated with the development of the wildfire disease (secretion of virulence factor), the enhanced metabolic capacity and environmental adaption. The M3 and M4 microbial communities have more intricate molecular ecological networks (MENs), bursting with interconnections within a densely networked bacterial population. The relative abundances of plant-beneficial and antagonistic microbes Clostridiales, Bacillales, Lactobacillales, and Sphingobacteriales, showed significant decrease in severally diseased sample (M3) compared to the pre-diseased samples (M1/M2). Following the results of MENs, we further test if the correlating bacterial pairs within the MEN have the possibility to share functional genes and we have unraveled 139 entries of such horizontal gene transfer (HGT) events, highlighting the significance of HGT in shaping the adaptive traits of plant-associated bacteria across the MENs, particularly in relation to host colonization and pathogenicity.
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Affiliation(s)
- Deyuan Peng
- Zhangjiajie Tobacco Company of Hunan Province, Zhangjiajie, China
| | - Zhenhua Wang
- Zhangjiajie Tobacco Company of Hunan Province, Zhangjiajie, China
| | - Jinyan Tian
- Zhangjiajie Tobacco Company of Hunan Province, Zhangjiajie, China
| | - Wei Wang
- Zhangjiajie Tobacco Company of Hunan Province, Zhangjiajie, China
| | - Shijie Guo
- Zhangjiajie Tobacco Company of Hunan Province, Zhangjiajie, China
| | - Xi Dai
- Zhangjiajie Tobacco Company of Hunan Province, Zhangjiajie, China
| | - Huaqun Yin
- School of Minerals Processing and Bioengineering, Central South University, Changsha, China
- Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha, China
| | - Liangzhi Li
- School of Minerals Processing and Bioengineering, Central South University, Changsha, China
- Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha, China
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Piña-Iturbe A, Hoppe-Elsholz G, Suazo ID, Kalergis AM, Bueno SM. Subinhibitory antibiotic concentrations promote the excision of a genomic island carried by the globally spread carbapenem-resistant Klebsiella pneumoniae sequence type 258. Microb Genom 2023; 9:001138. [PMID: 38079200 PMCID: PMC10763509 DOI: 10.1099/mgen.0.001138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2023] [Accepted: 11/07/2023] [Indexed: 12/18/2023] Open
Abstract
The ICEKp258.2 genomic island (GI) has been proposed as an important factor for the emergence and success of the globally spread carbapenem-resistant Klebsiella pneumoniae sequence type (ST) 258. However, a characterization of this horizontally acquired element is lacking. Using bioinformatic and experimental approaches, we found that ICEKp258.2 is not confined to ST258 and ST512, but also carried by ST3795 strains and emergent invasive multidrug-resistant pathogens from ST1519. We also identified several ICEKp258.2-like GIs spread among different K. pneumoniae STs, other Klebsiella species and even other pathogen genera, uncovering horizontal gene transfer events between different STs and bacterial genera. Also, the comparative and phylogenetic analyses of the ICEKp258.2-like GIs revealed that the most closely related ICEKp258.2-like GIs were harboured by ST11 strains. Importantly, we found that subinhibitory concentrations of antibiotics used in treating K. pneumoniae infections can induce the excision of this GI and modulate its gene expression. Our findings provide the basis for the study of ICEKp258.2 and its role in the success of K. pneumoniae ST258. They also highlight the potential role of antibiotics in the spread of ICEKp258.2-like GIs among bacterial pathogens.
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Affiliation(s)
- Alejandro Piña-Iturbe
- Millennium Institute on Immunology and Immunotherapy, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago 8331150, Chile
- Present address: Escuela de Medicina Veterinaria, Facultad de Agronomía y Sistemas Naturales, Facultad de Ciencias Biológicas y Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
| | - Guillermo Hoppe-Elsholz
- Millennium Institute on Immunology and Immunotherapy, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago 8331150, Chile
| | - Isidora D. Suazo
- Millennium Institute on Immunology and Immunotherapy, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago 8331150, Chile
| | - Alexis M. Kalergis
- Millennium Institute on Immunology and Immunotherapy, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago 8331150, Chile
- Departamento de Endocrinología, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago 8330023, Chile
| | - Susan M. Bueno
- Millennium Institute on Immunology and Immunotherapy, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago 8331150, Chile
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Genomic analysis reveals the role of integrative and conjugative elements in plant pathogenic bacteria. Mob DNA 2022; 13:19. [PMID: 35962419 PMCID: PMC9373382 DOI: 10.1186/s13100-022-00275-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2021] [Accepted: 06/22/2022] [Indexed: 11/29/2022] Open
Abstract
Background ICEs are mobile genetic elements found integrated into bacterial chromosomes that can excise and be transferred to a new cell. They play an important role in horizontal gene transmission and carry accessory genes that may provide interesting phenotypes for the bacteria. Here, we seek to research the presence and the role of ICEs in 300 genomes of phytopathogenic bacteria with the greatest scientific and economic impact. Results Seventy-eight ICEs (45 distinct elements) were identified and characterized in chromosomes of Agrobacterium tumefaciens, Dickeya dadantii, and D. solani, Pectobacterium carotovorum and P. atrosepticum, Pseudomonas syringae, Ralstonia solanacearum Species Complex, and Xanthomonas campestris. Intriguingly, the co-occurrence of four ICEs was observed in some P. syringae strains. Moreover, we identified 31 novel elements, carrying 396 accessory genes with potential influence on virulence and fitness, such as genes coding for functions related to T3SS, cell wall degradation and resistance to heavy metals. We also present the analysis of previously reported data on the expression of cargo genes related to the virulence of P. atrosepticum ICEs, which evidences the role of these genes in the infection process of tobacco plants. Conclusions Altogether, this paper has highlighted the potential of ICEs to affect the pathogenicity and lifestyle of these phytopathogens and direct the spread of significant putative virulence genes in phytopathogenic bacteria. Supplementary Information The online version contains supplementary material available at 10.1186/s13100-022-00275-1.
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Heilers JH, Reiners J, Heller EM, Golzer A, Smits SHJ, van der Does C. DNA processing by the MOBH family relaxase TraI encoded within the gonococcal genetic island. Nucleic Acids Res 2019; 47:8136-8153. [PMID: 31276596 PMCID: PMC6736028 DOI: 10.1093/nar/gkz577] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2018] [Revised: 06/18/2019] [Accepted: 06/26/2019] [Indexed: 11/26/2022] Open
Abstract
Relaxases of the MOBH family are often found on large plasmids, genetic islands and integrative conjugative elements. Many members of this family contain an N-terminal relaxase domain (TraI_2) followed by a disordered middle part and a C-terminal domain of unknown function (TraI_2_C). The TraI_2 domain contains two putative metal-binding motifs, an HD domain motif and an alternative 3H motif. TraI, encoded within the gonococcal genetic island of Neisseria gonorrhoeae, is the prototype of the MOBH family. SAXS experiments showed that TraI_2 and TraI_2_C form globular structures separated by an extended middle domain. The TraI_2 domain cleaves oriT-ssDNA in a site-specific Mn2+ or Co2+ dependent manner. The minimal oriT encompasses 50 nucleotides, requires an inverted repeat 3′ of the nic-site and several nucleotides around nic for efficient cleavage. Surprisingly, no stable covalent relaxase-DNA intermediate was observed. Mutagenesis of conserved tyrosines showed that cleavage was abolished in the Y212A mutant, whereas the Y212F and Y212H mutants retained residual activity. The HD and the alternative 3H motifs were essential for cleavage and the HD domain residues D162 and D267 for metal ion binding. We propose that the active site binds two metal ions, one in a high-affinity and one in a low-affinity site.
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Affiliation(s)
- Jan-Hendrik Heilers
- Institute for Biology II, Microbiology, Albert Ludwig University Freiburg, 79104 Freiburg, Germany
| | - Jens Reiners
- Biochemie I, Heinrich Heine University Düsseldorf, 40225 Düsseldorf, Germany.,Center for Structural Studies, Heinrich Heine University, 40225 Düsseldorf, Germany
| | | | - Annika Golzer
- Institute for Biology II, Microbiology, Albert Ludwig University Freiburg, 79104 Freiburg, Germany
| | - Sander H J Smits
- Biochemie I, Heinrich Heine University Düsseldorf, 40225 Düsseldorf, Germany.,Center for Structural Studies, Heinrich Heine University, 40225 Düsseldorf, Germany
| | - Chris van der Does
- Institute for Biology II, Microbiology, Albert Ludwig University Freiburg, 79104 Freiburg, Germany
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Pathogenicity island excision during an infection by Salmonella enterica serovar Enteritidis is required for crossing the intestinal epithelial barrier in mice to cause systemic infection. PLoS Pathog 2019; 15:e1008152. [PMID: 31800631 PMCID: PMC6968874 DOI: 10.1371/journal.ppat.1008152] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2019] [Revised: 01/17/2020] [Accepted: 10/21/2019] [Indexed: 02/07/2023] Open
Abstract
Pathogenicity island excision is a phenomenon that occurs in several Salmonella enterica serovars and other members of the family Enterobacteriaceae. ROD21 is an excisable pathogenicity island found in the chromosome of S. Enteritidis, S. Dublin and S. Typhi among others, which contain several genes encoding virulence-associated proteins. Excision of ROD21 may play a role in the ability of S. Enteritidis to cause a systemic infection in mice. Our previous studies have shown that Salmonella strains unable to excise ROD21 display a reduced ability to colonize the liver and spleen. In this work, we determined the kinetics of ROD21 excision in vivo in C57BL/6 mice and its effect on virulence. We quantified bacterial burden and excision frequency in different portions of the digestive tract and internal organs throughout the infection. We observed that the frequency of ROD21 excision was significantly increased in the bacterial population colonizing mesenteric lymph nodes at early stages of the infective cycle, before 48 hours post-infection. In contrast, excision frequency remained very low in the liver and spleen at these stages. Interestingly, excision increased drastically after 48 h post infection, when intestinal re-infection and mortality begun. Moreover, we observed that the inability to excise ROD21 had a negative effect on S. Enteritidis capacity to translocate from the intestine to deeper organs, which correlates with an abnormal transcription of invA in the S. Enteritidis strain unable to excise ROD21. These results suggest that excision of ROD21 is a genetic mechanism required by S. Enteritidis to produce a successful invasion of the intestinal epithelium, a step required to generate systemic infection in mice. Salmonella is a bacterial genus that causes foodborne illnesses worldwide. The ability of Salmonella to cause disease is related to the presence of Pathogenicity Islands (PAIs), which are clusters of genes within the bacterial chromosome that are involved in virulence. Interestingly, some PAIs excise and re-integrate into the bacterial chromosome, which is a process probably involved in the capacity of Salmonella to cause infection in their hosts. Here we show that the excision of Region of Difference 21 (ROD21), one of the excisable PAIs within the genome of Salmonella enterica serovar Enteritidis, occurs with high frequency in the mesenteric lymph node at early stages of infection, suggesting that excision is required by S. Enteritidis to reach this organ from the intestinal tract. Accordingly, S. Enteritidis strains unable to excise ROD21 are unable to invade intestinal host cells, delaying the infective cycle and showing attenuated virulence. We propose that ROD21 excision in vivo is required by S. Enteritidis to cross the intestinal barrier, a fundamental step to further colonize deep organs, due to modulation of virulence genes transcription. Thus, ROD21 excision may play an important role in the capacity of the bacteria to cause a successful systemic infection in the mouse. Our data suggest that the excision of PAIs is a mechanism used by Salmonella and probably other Gram-negative enterobacteria to modulate the expression of virulence genes and may provide insights to design novel therapies to control the infection caused by these pathogens.
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Bignell DRD, Cheng Z, Bown L. The coronafacoyl phytotoxins: structure, biosynthesis, regulation and biological activities. Antonie van Leeuwenhoek 2018; 111:649-666. [PMID: 29307013 DOI: 10.1007/s10482-017-1009-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2017] [Accepted: 12/19/2017] [Indexed: 12/11/2022]
Abstract
Phytotoxins are secondary metabolites that contribute to the development and/or severity of diseases caused by various plant pathogenic microorganisms. The coronafacoyl phytotoxins are an important family of plant toxins that are known or suspected to be produced by several phylogenetically distinct plant pathogenic bacteria, including the gammaproteobacterium Pseudomonas syringae and the actinobacterium Streptomyces scabies. At least seven different family members have been identified, of which coronatine was the first to be described and is the best-characterized. Though nonessential for disease development, coronafacoyl phytotoxins appear to enhance the severity of disease symptoms induced by pathogenic microbes during host infection. In addition, the identification of coronafacoyl phytotoxin biosynthetic genes in organisms not known to be plant pathogens suggests that these metabolites may have additional roles other than as virulence factors. This review focuses on our current understanding of the structures, biosynthesis, regulation, biological activities and evolution of coronafacoyl phytotoxins as well as the different methods that are used to detect these metabolites and the organisms that produce them.
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Affiliation(s)
- Dawn R D Bignell
- Department of Biology, Memorial University of Newfoundland, St. John's, NL, A1B 3X9, Canada.
| | - Zhenlong Cheng
- Department of Biology, Memorial University of Newfoundland, St. John's, NL, A1B 3X9, Canada
| | - Luke Bown
- Department of Biology, Memorial University of Newfoundland, St. John's, NL, A1B 3X9, Canada
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Kazlauskas D, Sezonov G, Charpin N, Venclovas Č, Forterre P, Krupovic M. Novel Families of Archaeo-Eukaryotic Primases Associated with Mobile Genetic Elements of Bacteria and Archaea. J Mol Biol 2017; 430:737-750. [PMID: 29198957 PMCID: PMC5862659 DOI: 10.1016/j.jmb.2017.11.014] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2017] [Revised: 11/22/2017] [Accepted: 11/23/2017] [Indexed: 11/15/2022]
Abstract
Cellular organisms in different domains of life employ structurally unrelated, non-homologous DNA primases for synthesis of a primer for DNA replication. Archaea and eukaryotes encode enzymes of the archaeo-eukaryotic primase (AEP) superfamily, whereas bacteria uniformly use primases of the DnaG family. However, AEP genes are widespread in bacterial genomes raising questions regarding their provenance and function. Here, using an archaeal primase–polymerase PolpTN2 encoded by pTN2 plasmid as a seed for sequence similarity searches, we recovered over 800 AEP homologs from bacteria belonging to 12 highly diverse phyla. These sequences formed a supergroup, PrimPol-PV1, and could be classified into five novel AEP families which are characterized by a conserved motif containing an arginine residue likely to be involved in nucleotide binding. Functional assays confirm the essentiality of this motif for catalytic activity of the PolpTN2 primase–polymerase. Further analyses showed that bacterial AEPs display a range of domain organizations and uncovered several candidates for novel families of helicases. Furthermore, sequence and structure comparisons suggest that PriCT-1 and PriCT-2 domains frequently fused to the AEP domains are related to each other as well as to the non-catalytic, large subunit of archaeal and eukaryotic primases, and to the recently discovered PriX subunit of archaeal primases. Finally, genomic neighborhood analysis indicates that the identified AEPs encoded in bacterial genomes are nearly exclusively associated with highly diverse integrated mobile genetic elements, including integrative conjugative plasmids and prophages. Primases of the archaeo-eukaryotic primase (AEP) superfamily are widespread in bacteria. We describe five new AEP families in bacteria belonging to 12 diverse phyla. The new AEP families display a conserved signature motif likely involved in nucleotide binding. The primase domains are fused to diverse functional domains, revealing new families of putative helicases. The novel primases are encoded within highly diverse integrated mobile genetic elements.
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Affiliation(s)
- Darius Kazlauskas
- Institute of Biotechnology, Vilnius University, Saulėtekio av. 7, Vilnius 10257, Lithuania
| | - Guennadi Sezonov
- Sorbonne Universités, UPMC Université Paris 06, CNRS, UMR 7138 Evolution Paris Seine-Institut de Biologie Paris Seine, Paris 75005, France
| | - Nicole Charpin
- Unité Biologie Moléculaire du Gène chez les Extrêmophiles, Department of Microbiology, Institut Pasteur, 25 rue du Docteur Roux, Paris 75015, France
| | - Česlovas Venclovas
- Institute of Biotechnology, Vilnius University, Saulėtekio av. 7, Vilnius 10257, Lithuania.
| | - Patrick Forterre
- Unité Biologie Moléculaire du Gène chez les Extrêmophiles, Department of Microbiology, Institut Pasteur, 25 rue du Docteur Roux, Paris 75015, France
| | - Mart Krupovic
- Unité Biologie Moléculaire du Gène chez les Extrêmophiles, Department of Microbiology, Institut Pasteur, 25 rue du Docteur Roux, Paris 75015, France.
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Brader G, Compant S, Vescio K, Mitter B, Trognitz F, Ma LJ, Sessitsch A. Ecology and Genomic Insights into Plant-Pathogenic and Plant-Nonpathogenic Endophytes. ANNUAL REVIEW OF PHYTOPATHOLOGY 2017; 55:61-83. [PMID: 28489497 DOI: 10.1146/annurev-phyto-080516-035641] [Citation(s) in RCA: 194] [Impact Index Per Article: 27.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Plants are colonized on their surfaces and in the rhizosphere and phyllosphere by a multitude of different microorganisms and are inhabited internally by endophytes. Most endophytes act as commensals without any known effect on their plant host, but multiple bacteria and fungi establish a mutualistic relationship with plants, and some act as pathogens. The outcome of these plant-microbe interactions depends on biotic and abiotic environmental factors and on the genotype of the host and the interacting microorganism. In addition, endophytic microbiota and the manifold interactions between members, including pathogens, have a profound influence on the function of the system plant and the development of pathobiomes. In this review, we elaborate on the differences and similarities between nonpathogenic and pathogenic endophytes in terms of host plant response, colonization strategy, and genome content. We furthermore discuss environmental effects and biotic interactions within plant microbiota that influence pathogenesis and the pathobiome.
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Affiliation(s)
- Günter Brader
- Center for Health and Bioresources, Bioresources Unit, Austrian Institute of Technology (AIT), 3430 Tulln, Austria
| | - Stéphane Compant
- Center for Health and Bioresources, Bioresources Unit, Austrian Institute of Technology (AIT), 3430 Tulln, Austria
| | - Kathryn Vescio
- Department of Biochemistry and Molecular Biology, University of Massachusetts, Amherst, Massachusetts 01003;
| | - Birgit Mitter
- Center for Health and Bioresources, Bioresources Unit, Austrian Institute of Technology (AIT), 3430 Tulln, Austria
| | - Friederike Trognitz
- Center for Health and Bioresources, Bioresources Unit, Austrian Institute of Technology (AIT), 3430 Tulln, Austria
| | - Li-Jun Ma
- Department of Biochemistry and Molecular Biology, University of Massachusetts, Amherst, Massachusetts 01003;
| | - Angela Sessitsch
- Department of Biochemistry and Molecular Biology, University of Massachusetts, Amherst, Massachusetts 01003;
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Bañuelos-Vazquez LA, Torres Tejerizo G, Brom S. Regulation of conjugative transfer of plasmids and integrative conjugative elements. Plasmid 2017; 91:82-89. [DOI: 10.1016/j.plasmid.2017.04.002] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2017] [Revised: 04/18/2017] [Accepted: 04/19/2017] [Indexed: 10/25/2022]
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11
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Colombi E, Straub C, Künzel S, Templeton MD, McCann HC, Rainey PB. Evolution of copper resistance in the kiwifruit pathogenPseudomonas syringaepv.actinidiaethrough acquisition of integrative conjugative elements and plasmids. Environ Microbiol 2017; 19:819-832. [DOI: 10.1111/1462-2920.13662] [Citation(s) in RCA: 70] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2016] [Accepted: 01/02/2017] [Indexed: 11/30/2022]
Affiliation(s)
- Elena Colombi
- New Zealand Institute for Advanced Study, Massey University; Auckland New Zealand
| | - Christina Straub
- New Zealand Institute for Advanced Study, Massey University; Auckland New Zealand
| | - Sven Künzel
- Max Planck Institute for Evolutionary Biology; Plön Germany
| | - Matthew D. Templeton
- Plant and Food Research; Auckland New Zealand
- School of Biological Sciences; University of Auckland; Auckland New Zealand
| | - Honour C. McCann
- New Zealand Institute for Advanced Study, Massey University; Auckland New Zealand
- South China Botanical Institute; Chinese Academy of Sciences; Guangzhou China
| | - Paul B. Rainey
- New Zealand Institute for Advanced Study, Massey University; Auckland New Zealand
- Max Planck Institute for Evolutionary Biology; Plön Germany
- Ecole Supérieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris-Tech), PSL Research University; Paris France
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Nieto PA, Pardo-Roa C, Salazar-Echegarai FJ, Tobar HE, Coronado-Arrázola I, Riedel CA, Kalergis AM, Bueno SM. New insights about excisable pathogenicity islands in Salmonella and their contribution to virulence. Microbes Infect 2016; 18:302-9. [DOI: 10.1016/j.micinf.2016.02.001] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2015] [Revised: 02/05/2016] [Accepted: 02/09/2016] [Indexed: 12/15/2022]
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13
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Panda P, Vanga BR, Lu A, Fiers M, Fineran PC, Butler R, Armstrong K, Ronson CW, Pitman AR. Pectobacterium atrosepticum and Pectobacterium carotovorum Harbor Distinct, Independently Acquired Integrative and Conjugative Elements Encoding Coronafacic Acid that Enhance Virulence on Potato Stems. Front Microbiol 2016; 7:397. [PMID: 27065965 PMCID: PMC4814525 DOI: 10.3389/fmicb.2016.00397] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2015] [Accepted: 03/14/2016] [Indexed: 12/25/2022] Open
Abstract
Integrative and conjugative elements (ICEs) play a central role in the evolution of bacterial virulence, their transmission between bacteria often leading to the acquisition of virulence factors that alter host range or aggressiveness. Much is known about the functions of the virulence determinants that ICEs harbor, but little is understood about the cryptic effects of ICEs on their host cell. In this study, the importance of horizontally acquired island 2 (HAI2), an ICE in the genome of Pectobacterium atrosepticum SCRI1043, was studied using a strain in which the entire ICE had been removed by CRISPR-Cas-mediated genome editing. HAI2 encodes coronafacic acid, a virulence factor that enhances blackleg disease of potato stems caused by P. atrosepticum SCRI1043. As expected, deletion of HAI2 resulted in reduced blackleg symptoms in potato stems. A subsequent screen for HAI2-related ICEs in other strains of the Pectobacterium genus revealed their ubiquitous nature in P. atrosepticum. Yet, HAI2-related ICEs were only detected in the genomes of a few P. carotovorum strains. These strains were notable as blackleg causing strains belonging to two different subspecies of P. carotovorum. Sequence analysis of the ICEs in different strains of both P. atrosepticum and P. carotovorum confirmed that they were diverse and were present in different locations on the genomes of their bacterial host, suggesting that the cfa cluster was probably acquired independently on a number of occasions via chromosomal insertion of related ICEs. Excision assays also demonstrated that the ICEs in both P. atrosepticum and P. carotovorum are mobilized from the host chromosome. Thus, the future spread of these ICEs via lateral gene transfer might contribute to an increase in the prevalence of blackleg-causing strains of P. carotovorum.
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Affiliation(s)
- Preetinanda Panda
- The Bio-Protection Research CentreLincoln, New Zealand
- Plant Pathology, The New Zealand Institute for Plant and Food Research LimitedLincoln, New Zealand
| | - Bhanupratap R. Vanga
- Plant Pathology, The New Zealand Institute for Plant and Food Research LimitedLincoln, New Zealand
- Department of Microbiology and Immunology, University of OtagoDunedin, New Zealand
| | - Ashley Lu
- Plant Pathology, The New Zealand Institute for Plant and Food Research LimitedLincoln, New Zealand
| | - Mark Fiers
- Plant Pathology, The New Zealand Institute for Plant and Food Research LimitedLincoln, New Zealand
| | - Peter C. Fineran
- The Bio-Protection Research CentreLincoln, New Zealand
- Department of Microbiology and Immunology, University of OtagoDunedin, New Zealand
| | - Ruth Butler
- Plant Pathology, The New Zealand Institute for Plant and Food Research LimitedLincoln, New Zealand
| | | | - Clive W. Ronson
- Department of Microbiology and Immunology, University of OtagoDunedin, New Zealand
| | - Andrew R. Pitman
- The Bio-Protection Research CentreLincoln, New Zealand
- Plant Pathology, The New Zealand Institute for Plant and Food Research LimitedLincoln, New Zealand
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