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ToolsWilkinson, Paul, Waterfield, Nicholas R., Crossman, Lisa, Corton, Craig, Sanchez-Contreras, Maria, Vlisidou, Isabella, Barron, Andrew, Bignell, Alexandra, Clark, Louise, Ormond, Douglas, Mayho, Matthew, Bason, Nathalie, Smith, Frances, Simmonds, Mark, Churcher, Carol, Harris, David, Thompson, Nicholas R., Quail, Michael, Parkhill, Julian and ffrench-Constant, Richard H. (2009) Comparative genomics of the emerging human pathogen Photorhabdus asymbiotica with the insect pathogen Photorhabdus luminescens. BMC Genomics, 10. ISSN 1471-2164
Full text not available from this repository. (Request a copy)Abstract
Background: The Gram-negative bacterium Photorhabdus asymbiotica (Pa) has been recovered from human infections in both North America and Australia. Recently, Pa has been shown to have a nematode vector that can also infect insects, like its sister species the insect pathogen P. luminescens (Pl). To understand the relationship between pathogenicity to insects and humans in Photorhabdus we have sequenced the complete genome of Pa strain ATCC43949 from North America. This strain (formerly referred to as Xenorhabdus luminescens strain 2) was isolated in 1977 from the blood of an 80 year old female patient with endocarditis, in Maryland, USA. Here we compare the complete genome of Pa ATCC43949 with that of the previously sequenced insect pathogen P. luminescens strain TT01 which was isolated from its entomopathogenic nematode vector collected from soil in Trinidad and Tobago. Results: We found that the human pathogen Pa had a smaller genome (5,064,808 bp) than that of the insect pathogen Pl (5,688,987 bp) but that each pathogen carries approximately one megabase of DNA that is unique to each strain. The reduced size of the Pa genome is associated with a smaller diversity in insecticidal genes such as those encoding the Toxin complexes (Tc's), Makes caterpillars floppy (Mcf) toxins and the Photorhabdus Virulence Cassettes (PVCs). The Pa genome, however, also shows the addition of a plasmid related to pMT1 from Yersinia pestis and several novel pathogenicity islands including a novel Type Three Secretion System (TTSS) encoding island. Together these data suggest that Pa may show virulence against man via the acquisition of the pMT1-like plasmid and specific effectors, such as SopB, that promote its persistence inside human macrophages. Interestingly the loss of insecticidal genes in Pa is not reflected by a loss of pathogenicity towards insects. Conclusion: Our results suggest that North American isolates of Pa have acquired virulence against man via the acquisition of a plasmid and specific virulence factors with similarity to those shown to play roles in pathogenicity against humans in other bacteria.
| Item Type: | Article |
|---|---|
| Additional Information: | Funding Information: We thank the BBSRC for funding this work under a grant to RffC via the Exploiting Genomics initiative and the EU (EMBEK1 and GAMEXP programs) for support of NW and RffC during the writing of the manuscript. This paper is dedicated to the memory of Marie-Adele Rajandream who passed away during the course of this project. |
| Uncontrolled Keywords: | biotechnology,genetics ,/dk/atira/pure/subjectarea/asjc/1300/1305 |
| Faculty \ School: | Faculty of Science > School of Biological Sciences |
| Related URLs: | |
| Depositing User: | LivePure Connector |
| Date Deposited: | 14 May 2024 10:31 |
| Last Modified: | 14 May 2024 13:31 |
| URI: | https://ueaeprints.uea.ac.uk/id/eprint/95152 |
| DOI: | 10.1186/1471-2164-10-302 |
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