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Preprint
Tracing the environmental footprint of the Burkholderia pseudomallei lipopolysaccharide genotypes in the tropical “Top End” of the Northern Territory, Australia
bioRxiv
Cold Spring Harbor Laboratory Press
2019
Abstract
The Tier 1 select agent Burkholderia pseudomallei is an environmental bacterium that causes melioidosis, a high mortality disease. Variably present genetic markers used to elucidate strain origin, relatedness and virulence in B. pseudomallei include the Burkholderia intracellular motility factor A (bimA) and filamentous hemagglutinin 3 (fhaB3) gene variants. Three lipopolysaccharide (LPS) O-antigen types in B. pseudomallei have been described, which vary in proportion between Australian and Asian isolates. However, it remains unknown if these LPS types can be used as genetic markers for geospatial analysis within a contiguous melioidosis-endemic region. Using a combination of whole-genome sequencing (WGS), statistical analysis and geographical mapping, we examined if the LPS types can be used as geographical markers in the Northern Territory, Australia. The clinical isolates revealed that LPS A prevalence was highest in the Darwin and surrounds (n = 660; 96% being LPS A and 4% LPS B) and LPS B in the Katherine and Katherine remote and East Arnhem regions (n = 79; 60% being LPS A and 40% LPS B). Bivariate logistics regression of 999 clinical B. pseudomallei isolates revealed that the odds of getting a clinical isolate with LPS B was highest in East Arnhem in comparison to Darwin and surrounds (OR 19.5, 95% CI 9.1 - 42.0; p<0.001). This geospatial correlation was subsequently confirmed by geographically mapping the LPS type from 340 environmental Top End strains. We also found that in the Top End, the minority bimA genotype bimABm has a similar remote region geographical footprint to that of LPS B. In addition, correlation of LPS type with multi-locus sequence typing (MLST) was strong, and where multiple LPS types were identified within a single sequence type, WGS confirmed homoplasy of the MLST loci. The clinical, sero-diagnostic and vaccine implications of geographically-based B. pseudomallei LPS types, and their relationships to regional and global dispersal of melioidosis, require global collaborations with further analysis of larger clinically and geospatially-linked datasets.
Details
- Title
- Tracing the environmental footprint of the Burkholderia pseudomallei lipopolysaccharide genotypes in the tropical “Top End” of the Northern Territory, Australia
- Authors
- Jessica R Webb (Author) - Menzies School of Health ResearchAudrey Rachlin (Author) - Menzies School of Health ResearchVanessa Rigas (Author) - Menzies School of Health ResearchDerek S Sarovich (Author) - University of the Sunshine CoastErin P Price (Author) - University of the Sunshine CoastMirjam Kaestli (Author) - Menzies School of Health ResearchLinda M Ward (Author) - Menzies School of Health ResearchMark Mayo (Author) - Menzies School of Health ResearchBart J Currie (Author) - Menzies School of Health Research
- Publication details
- bioRxiv
- Publisher
- Cold Spring Harbor Laboratory Press
- Date published
- 2019
- DOI
- 10.1101/603886
- ISSN
- 2692-8205
- Copyright note
- Copyright © 2019 The authors. This preprint (which was not peer-reviewed) is made available under a CC-BY-NC 4.0 International license.
- Organisation Unit
- School of Science, Technology and Engineering; Centre for Bioinnovation
- Language
- English
- Record Identifier
- 99450729602621
- Output Type
- Preprint
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