Fitness of Spontaneous Rifampicin-Resistant Staphylococcus aureus Isolates in a Biofilm Environment
Biofilms of S. aureus accumulate cells resistant to the antibiotic rifampicin. We show here that the accumulation of rifampicin resistant mutants (RifR) in biofilms is not equable but rather is a local event, suggesting that the growth of a few locally emerged mutants is responsible for this. Compet...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Frontiers Media S.A.
2019-05-01
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| Series: | Frontiers in Microbiology |
| Subjects: | |
| Online Access: | https://www.frontiersin.org/article/10.3389/fmicb.2019.00988/full |
| _version_ | 1819232126447386624 |
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| author | Lisa Maudsdotter Yuri Ushijima Kazuya Morikawa |
| author_facet | Lisa Maudsdotter Yuri Ushijima Kazuya Morikawa |
| author_sort | Lisa Maudsdotter |
| collection | DOAJ |
| description | Biofilms of S. aureus accumulate cells resistant to the antibiotic rifampicin. We show here that the accumulation of rifampicin resistant mutants (RifR) in biofilms is not equable but rather is a local event, suggesting that the growth of a few locally emerged mutants is responsible for this. Competition assays demonstrated that, compared to wild-type bacteria, the isolated RifR mutants have a growth advantage in biofilms, but not in planktonic culture. To gain insight into the mechanism of the growth advantage, we tested the involvement of the two-component systems (TCS) that sense and respond to environmental changes. We found that a deletion of SrrAB or NreBC has a drastic effect on the growth advantage of RifR mutants, suggesting the importance of oxygen/respiration responses. All six of the RifR isolates tested showed increased resistance to at least one of the common stresses found in the biofilm environment (i.e., oxidative, nitric acid, and organic acid stress). The RifR mutants also had a growth advantage in a biofilm flow model, which highlights the physiological relevance of our findings. |
| first_indexed | 2024-12-23T11:55:54Z |
| format | Article |
| id | doaj.art-997ace04b1db47d39a98eaabe5802d3f |
| institution | Directory Open Access Journal |
| issn | 1664-302X |
| language | English |
| last_indexed | 2024-12-23T11:55:54Z |
| publishDate | 2019-05-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Microbiology |
| spelling | doaj.art-997ace04b1db47d39a98eaabe5802d3f2022-12-21T17:48:05ZengFrontiers Media S.A.Frontiers in Microbiology1664-302X2019-05-011010.3389/fmicb.2019.00988447646Fitness of Spontaneous Rifampicin-Resistant Staphylococcus aureus Isolates in a Biofilm EnvironmentLisa MaudsdotterYuri UshijimaKazuya MorikawaBiofilms of S. aureus accumulate cells resistant to the antibiotic rifampicin. We show here that the accumulation of rifampicin resistant mutants (RifR) in biofilms is not equable but rather is a local event, suggesting that the growth of a few locally emerged mutants is responsible for this. Competition assays demonstrated that, compared to wild-type bacteria, the isolated RifR mutants have a growth advantage in biofilms, but not in planktonic culture. To gain insight into the mechanism of the growth advantage, we tested the involvement of the two-component systems (TCS) that sense and respond to environmental changes. We found that a deletion of SrrAB or NreBC has a drastic effect on the growth advantage of RifR mutants, suggesting the importance of oxygen/respiration responses. All six of the RifR isolates tested showed increased resistance to at least one of the common stresses found in the biofilm environment (i.e., oxidative, nitric acid, and organic acid stress). The RifR mutants also had a growth advantage in a biofilm flow model, which highlights the physiological relevance of our findings.https://www.frontiersin.org/article/10.3389/fmicb.2019.00988/fullStaphylococcus aureusbiofilmrifampicinfitnessresistance |
| spellingShingle | Lisa Maudsdotter Yuri Ushijima Kazuya Morikawa Fitness of Spontaneous Rifampicin-Resistant Staphylococcus aureus Isolates in a Biofilm Environment Frontiers in Microbiology Staphylococcus aureus biofilm rifampicin fitness resistance |
| title | Fitness of Spontaneous Rifampicin-Resistant Staphylococcus aureus Isolates in a Biofilm Environment |
| title_full | Fitness of Spontaneous Rifampicin-Resistant Staphylococcus aureus Isolates in a Biofilm Environment |
| title_fullStr | Fitness of Spontaneous Rifampicin-Resistant Staphylococcus aureus Isolates in a Biofilm Environment |
| title_full_unstemmed | Fitness of Spontaneous Rifampicin-Resistant Staphylococcus aureus Isolates in a Biofilm Environment |
| title_short | Fitness of Spontaneous Rifampicin-Resistant Staphylococcus aureus Isolates in a Biofilm Environment |
| title_sort | fitness of spontaneous rifampicin resistant staphylococcus aureus isolates in a biofilm environment |
| topic | Staphylococcus aureus biofilm rifampicin fitness resistance |
| url | https://www.frontiersin.org/article/10.3389/fmicb.2019.00988/full |
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