Within-host genomic evolution of methicillin-resistant Staphylococcus aureus in long-term carriers
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Assessing the genomic evolution of Staphylococcus aureus can help us understand how the bacteria adapt to its environment. In this study, we aimed to assess the mutation rate within 144 methicillin-resistant Staphylococcus aureus (MRSA) carriers with a carriage time from 4 to 11 years, including some carriers who belonged to the same households. We found that 23 of the 144 individuals had completely different MRSA types over time and were therefore not long-term carriers of the same MRSA. From the remaining 121 individuals, we performed whole-genome sequencing (WGS) on 424 isolates and then compared these pairwise using core genome multilocus sequence typing (cgMLST) and single-nucleotide polymorphism (SNP) analyses. We found a median within-host mutation rate in long-term MRSA carriers of 4.9 (3.4–6.9) SNPs/genome/year and 2.7 (1.8–4.2) allelic differences/genome/year, when excluding presumed recombination. Furthermore, we stratified the cohort into subgroups and found no significant difference between the median mutation rate of members of households, individuals with presumed continued exposure, e.g., from travel and persons without known continued exposure. Finally, we found that SNPs occurred at random within the genes in our cohort.
Originalsprog | Engelsk |
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Artikelnummer | 95 |
Tidsskrift | Applied Microbiology and Biotechnology |
Vol/bind | 108 |
Udgave nummer | 1 |
Sider (fra-til) | 1-9 |
Antal sider | 9 |
ISSN | 0175-7598 |
DOI | |
Status | Udgivet - 2024 |
Bibliografisk note
Funding Information:
The study was only possible due to the help and support from the staff of the Department of Clinical Microbiology, Hvidovre Hospital, especially the Whole Genome Sequencing Team.
Publisher Copyright:
© 2024, The Author(s).
ID: 380213117