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Influence of insertion sequences on population structure of phytopathogenic bacteria in the Ralstonia solanacearum species complex

Ralstonia solanacearum species complex (RSSC) is a destructive group of plant pathogenic bacteria and the causative agent of bacterial wilt disease. Experimental studies have attributed RSSC virulence to insertion sequences (IS), transposable genetic elements which can both disrupt and activate host...

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Autores principales: Greenrod, Samuel T. E., Stoycheva, Martina, Elphinstone, John, Friman, Ville-Petri
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Microbiology Society 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10433421/
https://www.ncbi.nlm.nih.gov/pubmed/37458734
http://dx.doi.org/10.1099/mic.0.001364
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author Greenrod, Samuel T. E.
Stoycheva, Martina
Elphinstone, John
Friman, Ville-Petri
author_facet Greenrod, Samuel T. E.
Stoycheva, Martina
Elphinstone, John
Friman, Ville-Petri
author_sort Greenrod, Samuel T. E.
collection PubMed
description Ralstonia solanacearum species complex (RSSC) is a destructive group of plant pathogenic bacteria and the causative agent of bacterial wilt disease. Experimental studies have attributed RSSC virulence to insertion sequences (IS), transposable genetic elements which can both disrupt and activate host genes. Yet, the global diversity and distribution of RSSC IS are unknown. In this study, IS were bioinformatically identified in a diverse collection of 356 RSSC isolates representing five phylogenetic lineages and their diversity investigated based on genetic distance measures and comparisons with the ISFinder database. IS phylogenetic associations were determined based on their distribution across the RSSC phylogeny. Moreover, IS positions within genomes were characterised and their potential gene disruptions determined based on IS proximity to coding sequences. In total, we found 24732 IS belonging to eleven IS families and 26 IS subgroups with over half of the IS found in the megaplasmid. While IS families were generally widespread across the RSSC phylogeny, IS subgroups showed strong lineage-specific distributions and genetically similar bacterial isolates had similar IS contents. Similar associations with bacterial host genetic background were also observed with IS insertion positions which were highly conserved in closely related bacterial isolates. Finally, IS were found to disrupt genes with predicted functions in virulence, stress tolerance, and metabolism suggesting that they might be adaptive. This study highlights that RSSC insertion sequences track the evolution of their bacterial hosts potentially contributing to both intra- and inter-lineage genetic diversity.
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spelling pubmed-104334212023-08-18 Influence of insertion sequences on population structure of phytopathogenic bacteria in the Ralstonia solanacearum species complex Greenrod, Samuel T. E. Stoycheva, Martina Elphinstone, John Friman, Ville-Petri Microbiology (Reading) Microbial Evolution Ralstonia solanacearum species complex (RSSC) is a destructive group of plant pathogenic bacteria and the causative agent of bacterial wilt disease. Experimental studies have attributed RSSC virulence to insertion sequences (IS), transposable genetic elements which can both disrupt and activate host genes. Yet, the global diversity and distribution of RSSC IS are unknown. In this study, IS were bioinformatically identified in a diverse collection of 356 RSSC isolates representing five phylogenetic lineages and their diversity investigated based on genetic distance measures and comparisons with the ISFinder database. IS phylogenetic associations were determined based on their distribution across the RSSC phylogeny. Moreover, IS positions within genomes were characterised and their potential gene disruptions determined based on IS proximity to coding sequences. In total, we found 24732 IS belonging to eleven IS families and 26 IS subgroups with over half of the IS found in the megaplasmid. While IS families were generally widespread across the RSSC phylogeny, IS subgroups showed strong lineage-specific distributions and genetically similar bacterial isolates had similar IS contents. Similar associations with bacterial host genetic background were also observed with IS insertion positions which were highly conserved in closely related bacterial isolates. Finally, IS were found to disrupt genes with predicted functions in virulence, stress tolerance, and metabolism suggesting that they might be adaptive. This study highlights that RSSC insertion sequences track the evolution of their bacterial hosts potentially contributing to both intra- and inter-lineage genetic diversity. Microbiology Society 2023-07-17 /pmc/articles/PMC10433421/ /pubmed/37458734 http://dx.doi.org/10.1099/mic.0.001364 Text en © 2023 The Authors https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution License. This article was made open access via a Publish and Read agreement between the Microbiology Society and the corresponding author’s institution.
spellingShingle Microbial Evolution
Greenrod, Samuel T. E.
Stoycheva, Martina
Elphinstone, John
Friman, Ville-Petri
Influence of insertion sequences on population structure of phytopathogenic bacteria in the Ralstonia solanacearum species complex
title Influence of insertion sequences on population structure of phytopathogenic bacteria in the Ralstonia solanacearum species complex
title_full Influence of insertion sequences on population structure of phytopathogenic bacteria in the Ralstonia solanacearum species complex
title_fullStr Influence of insertion sequences on population structure of phytopathogenic bacteria in the Ralstonia solanacearum species complex
title_full_unstemmed Influence of insertion sequences on population structure of phytopathogenic bacteria in the Ralstonia solanacearum species complex
title_short Influence of insertion sequences on population structure of phytopathogenic bacteria in the Ralstonia solanacearum species complex
title_sort influence of insertion sequences on population structure of phytopathogenic bacteria in the ralstonia solanacearum species complex
topic Microbial Evolution
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10433421/
https://www.ncbi.nlm.nih.gov/pubmed/37458734
http://dx.doi.org/10.1099/mic.0.001364
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