Evolution of multidrug resistance during staphylococcus aureus infection involves mutation of the essential two component regulator WalKR
Antimicrobial resistance in Staphylococcus aureus is a major public health threat, compounded by emergence of strains with resistance to vancomycin and daptomycin, both last line antimicrobials. Here we have performed high throughput DNA sequencing and comparative genomics for five clinical pairs of...
| Main Authors: | , , , , , , , , , , , , , |
|---|---|
| Format: | Journal Article |
| Published: |
2011
|
| Online Access: | http://hdl.handle.net/20.500.11937/35797 |
| _version_ | 1848754594070396928 |
|---|---|
| author | Howden, B. McEvoy, C. Allen, D. Chua, K. Gao, W. Harrison, P. Bell, J. Coombs, Geoffrey Bennett-Wood, V. Porter, J. Robins-Browne, R. Davies, J. Seemann, T. Stinear, T. |
| author_facet | Howden, B. McEvoy, C. Allen, D. Chua, K. Gao, W. Harrison, P. Bell, J. Coombs, Geoffrey Bennett-Wood, V. Porter, J. Robins-Browne, R. Davies, J. Seemann, T. Stinear, T. |
| author_sort | Howden, B. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Antimicrobial resistance in Staphylococcus aureus is a major public health threat, compounded by emergence of strains with resistance to vancomycin and daptomycin, both last line antimicrobials. Here we have performed high throughput DNA sequencing and comparative genomics for five clinical pairs of vancomycin-susceptible (VSSA) and vancomycin-intermediate ST239 S. aureus (VISA); each pair isolated before and after vancomycin treatment failure. These comparisons revealed a frequent pattern of mutation among the VISA strains within the essential walKR two-component regulatory locus involved in control of cell wall metabolism. We then conducted bi-directional allelic exchange experiments in our clinical VSSA and VISA strains and showed that single nucleotide substitutions within either walK or walR lead to co-resistance to vancomycin and daptomycin, and caused the typical cell wall thickening observed in resistant clinical isolates. Ion Torrent genome sequencing confirmed no additional regulatory mutations had been introduced into either the walR or walK VISA mutants during the allelic exchange process. However, two potential compensatory mutations were detected within putative transport genes for the walK mutant. The minimal genetic changes in either walK or walR also attenuated virulence, reduced biofilm formation, and led to consistent transcriptional changes that suggest an important role for this regulator in control of central metabolism. This study highlights the dramatic impacts of single mutations that arise during persistent S. aureus infections and demonstrates the role played by walKR to increase drug resistance, control metabolism and alter the virulence potential of this pathogen. © 2011 Howden et al. |
| first_indexed | 2025-11-14T08:42:53Z |
| format | Journal Article |
| id | curtin-20.500.11937-35797 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T08:42:53Z |
| publishDate | 2011 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-357972017-09-13T15:31:14Z Evolution of multidrug resistance during staphylococcus aureus infection involves mutation of the essential two component regulator WalKR Howden, B. McEvoy, C. Allen, D. Chua, K. Gao, W. Harrison, P. Bell, J. Coombs, Geoffrey Bennett-Wood, V. Porter, J. Robins-Browne, R. Davies, J. Seemann, T. Stinear, T. Antimicrobial resistance in Staphylococcus aureus is a major public health threat, compounded by emergence of strains with resistance to vancomycin and daptomycin, both last line antimicrobials. Here we have performed high throughput DNA sequencing and comparative genomics for five clinical pairs of vancomycin-susceptible (VSSA) and vancomycin-intermediate ST239 S. aureus (VISA); each pair isolated before and after vancomycin treatment failure. These comparisons revealed a frequent pattern of mutation among the VISA strains within the essential walKR two-component regulatory locus involved in control of cell wall metabolism. We then conducted bi-directional allelic exchange experiments in our clinical VSSA and VISA strains and showed that single nucleotide substitutions within either walK or walR lead to co-resistance to vancomycin and daptomycin, and caused the typical cell wall thickening observed in resistant clinical isolates. Ion Torrent genome sequencing confirmed no additional regulatory mutations had been introduced into either the walR or walK VISA mutants during the allelic exchange process. However, two potential compensatory mutations were detected within putative transport genes for the walK mutant. The minimal genetic changes in either walK or walR also attenuated virulence, reduced biofilm formation, and led to consistent transcriptional changes that suggest an important role for this regulator in control of central metabolism. This study highlights the dramatic impacts of single mutations that arise during persistent S. aureus infections and demonstrates the role played by walKR to increase drug resistance, control metabolism and alter the virulence potential of this pathogen. © 2011 Howden et al. 2011 Journal Article http://hdl.handle.net/20.500.11937/35797 10.1371/journal.ppat.1002359 fulltext |
| spellingShingle | Howden, B. McEvoy, C. Allen, D. Chua, K. Gao, W. Harrison, P. Bell, J. Coombs, Geoffrey Bennett-Wood, V. Porter, J. Robins-Browne, R. Davies, J. Seemann, T. Stinear, T. Evolution of multidrug resistance during staphylococcus aureus infection involves mutation of the essential two component regulator WalKR |
| title | Evolution of multidrug resistance during staphylococcus aureus infection involves mutation of the essential two component regulator WalKR |
| title_full | Evolution of multidrug resistance during staphylococcus aureus infection involves mutation of the essential two component regulator WalKR |
| title_fullStr | Evolution of multidrug resistance during staphylococcus aureus infection involves mutation of the essential two component regulator WalKR |
| title_full_unstemmed | Evolution of multidrug resistance during staphylococcus aureus infection involves mutation of the essential two component regulator WalKR |
| title_short | Evolution of multidrug resistance during staphylococcus aureus infection involves mutation of the essential two component regulator WalKR |
| title_sort | evolution of multidrug resistance during staphylococcus aureus infection involves mutation of the essential two component regulator walkr |
| url | http://hdl.handle.net/20.500.11937/35797 |