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Title: The Distinctive Evolution of orfX Clostridium parabotulinum Strains and Their Botulinum Neurotoxin Type A and F Gene Clusters Is Influenced by Environmental Factors and Gene Interactions via Mobile Genetic Elements

Abstract

Of the seven currently known botulinum neurotoxin-producing species of Clostridium, C. parabotulinum, or C. botulinum Group I, is the species associated with the majority of human botulism cases worldwide. Phylogenetic analysis of these bacteria reveals a diverse species with multiple genomic clades. The neurotoxins they produce are also diverse, with over 20 subtypes currently represented. The existence of different bont genes within very similar genomes and of the same bont genes/gene clusters within different bacterial variants/species indicates that they have evolved independently. The neurotoxin genes are associated with one of two toxin gene cluster types containing either hemagglutinin (ha) genes or orfX genes. These genes may be located within the chromosome or extrachromosomal elements such as large plasmids. Although BoNT-producing C parabotulinum bacteria are distributed globally, they are more ubiquitous in certain specific geographic regions. Notably, northern hemisphere strains primarily contain ha gene clusters while southern hemisphere strains have a preponderance of orfX gene clusters. OrfX C. parabotulinum strains constitute a subset of this species that contain highly conserved bont gene clusters having a diverse range of bont genes. While much has been written about strains with ha gene clusters, less attention has been devoted to those with orfX genemore » clusters. The recent sequencing of 28 orfX C. parabotulinum strains and the availability of an additional 91 strains for analysis provides an opportunity to compare genomic relationships and identify unique toxin gene cluster characteristics and locations within this species subset in depth. The mechanisms behind the independent processes of bacteria evolution and generation of toxin diversity are explored through the examination of bacterial relationships relating to source locations and evidence of horizontal transfer of genetic material among different bacterial variants, particularly concerning bont gene clusters. Analysis of the content and locations of the bont gene clusters offers insights into common mechanisms of genetic transfer, chromosomal integration, and development of diversity among these genes.« less

Authors:
 [1];  [1];  [2]; ORCiD logo [2]; ORCiD logo [2];  [3];  [3];  [4];  [4];  [1];  [1]
  1. Northern Arizona Univ., Flagstaff, AZ (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Istituto Superiore di Sanita, Rome (Italy)
  4. Universidad Nacional de Cuyo, Mendoza (Argentina)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
U.S. Department of Homeland Security (DHS); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1868218
Report Number(s):
LA-UR-20-24104
Journal ID: ISSN 1664-302X
Grant/Contract Number:  
89233218CNA000001; HSHQDC-16-C-B0013
Resource Type:
Accepted Manuscript
Journal Name:
Frontiers in Microbiology
Additional Journal Information:
Journal Volume: 12; Journal ID: ISSN 1664-302X
Publisher:
Frontiers Research Foundation
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; clostridium parabotulinum; neurotoxin; plasmids; orfX; lycA; arsC; pulE

Citation Formats

Smith, Theresa J., Williamson, Charles D., Hill, Karen K., Johnson, Shannon L., Xie, Gary, Anniballi, Fabrizio, Auricchio, Bruna, Fernández, Rafael A., Caballero, Patricia A., Keim, Paul, and Sahl, Jason W. The Distinctive Evolution of orfX Clostridium parabotulinum Strains and Their Botulinum Neurotoxin Type A and F Gene Clusters Is Influenced by Environmental Factors and Gene Interactions via Mobile Genetic Elements. United States: N. p., 2021. Web. doi:10.3389/fmicb.2021.566908.
Smith, Theresa J., Williamson, Charles D., Hill, Karen K., Johnson, Shannon L., Xie, Gary, Anniballi, Fabrizio, Auricchio, Bruna, Fernández, Rafael A., Caballero, Patricia A., Keim, Paul, & Sahl, Jason W. The Distinctive Evolution of orfX Clostridium parabotulinum Strains and Their Botulinum Neurotoxin Type A and F Gene Clusters Is Influenced by Environmental Factors and Gene Interactions via Mobile Genetic Elements. United States. https://doi.org/10.3389/fmicb.2021.566908
Smith, Theresa J., Williamson, Charles D., Hill, Karen K., Johnson, Shannon L., Xie, Gary, Anniballi, Fabrizio, Auricchio, Bruna, Fernández, Rafael A., Caballero, Patricia A., Keim, Paul, and Sahl, Jason W. Fri . "The Distinctive Evolution of orfX Clostridium parabotulinum Strains and Their Botulinum Neurotoxin Type A and F Gene Clusters Is Influenced by Environmental Factors and Gene Interactions via Mobile Genetic Elements". United States. https://doi.org/10.3389/fmicb.2021.566908. https://www.osti.gov/servlets/purl/1868218.
@article{osti_1868218,
title = {The Distinctive Evolution of orfX Clostridium parabotulinum Strains and Their Botulinum Neurotoxin Type A and F Gene Clusters Is Influenced by Environmental Factors and Gene Interactions via Mobile Genetic Elements},
author = {Smith, Theresa J. and Williamson, Charles D. and Hill, Karen K. and Johnson, Shannon L. and Xie, Gary and Anniballi, Fabrizio and Auricchio, Bruna and Fernández, Rafael A. and Caballero, Patricia A. and Keim, Paul and Sahl, Jason W.},
abstractNote = {Of the seven currently known botulinum neurotoxin-producing species of Clostridium, C. parabotulinum, or C. botulinum Group I, is the species associated with the majority of human botulism cases worldwide. Phylogenetic analysis of these bacteria reveals a diverse species with multiple genomic clades. The neurotoxins they produce are also diverse, with over 20 subtypes currently represented. The existence of different bont genes within very similar genomes and of the same bont genes/gene clusters within different bacterial variants/species indicates that they have evolved independently. The neurotoxin genes are associated with one of two toxin gene cluster types containing either hemagglutinin (ha) genes or orfX genes. These genes may be located within the chromosome or extrachromosomal elements such as large plasmids. Although BoNT-producing C parabotulinum bacteria are distributed globally, they are more ubiquitous in certain specific geographic regions. Notably, northern hemisphere strains primarily contain ha gene clusters while southern hemisphere strains have a preponderance of orfX gene clusters. OrfX C. parabotulinum strains constitute a subset of this species that contain highly conserved bont gene clusters having a diverse range of bont genes. While much has been written about strains with ha gene clusters, less attention has been devoted to those with orfX gene clusters. The recent sequencing of 28 orfX C. parabotulinum strains and the availability of an additional 91 strains for analysis provides an opportunity to compare genomic relationships and identify unique toxin gene cluster characteristics and locations within this species subset in depth. The mechanisms behind the independent processes of bacteria evolution and generation of toxin diversity are explored through the examination of bacterial relationships relating to source locations and evidence of horizontal transfer of genetic material among different bacterial variants, particularly concerning bont gene clusters. Analysis of the content and locations of the bont gene clusters offers insights into common mechanisms of genetic transfer, chromosomal integration, and development of diversity among these genes.},
doi = {10.3389/fmicb.2021.566908},
journal = {Frontiers in Microbiology},
number = ,
volume = 12,
place = {United States},
year = {Fri Feb 26 00:00:00 EST 2021},
month = {Fri Feb 26 00:00:00 EST 2021}
}

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