Adaptation of Stenotrophomonas maltophilia in cystic fibrosis: molecular diversity, mutation frequency and antibiotic resistance.

2.50
Hdl Handle:
http://hdl.handle.net/10033/332865
Title:
Adaptation of Stenotrophomonas maltophilia in cystic fibrosis: molecular diversity, mutation frequency and antibiotic resistance.
Authors:
Vidigal, P G; Dittmer, S; Steinmann, E; Buer, J; Rath, P-M; Steinmann, J
Abstract:
Due to the continuous exposure to a challenging environment and repeated antibiotic treatment courses, bacterial populations in cystic fibrosis (CF) patients experience selective pressure causing the emergence of mutator phenotypes. In this study we investigated the genotypic diversity, mutation frequency and antibiotic resistance of S. maltophilia isolates chronically colonizing CF patients. S. maltophilia was isolated from a total of 90 sputum samples, collected sequentially from 19 CF patients admitted between January 2008 and March 2012 at the University Hospital Essen, Germany. DNA fingerprinting by repetitive-sequence-based PCR revealed that 68.4% (n=13) of CF patients harbored different S. maltophilia genotypes during the 4-year study course. Out of 90 S. maltophilia isolates obtained from chronically colonized CF patients, 17.8% (n=16) were hypomutators, 27.7% (n=25), normomutators, 23.3% (n=21), weak hypermutators and 31.2% (n=28) strong hypermutators. We also found that mutation rates of the most clonally related genotypes varied over time with the tendency to become less mutable. Mutator isolates were found to have no significant increase in resistance against eight different antibiotics versus nonmutators. Sequencing of the mismatch repair genes mutL, mutS and uvrD revealed alterations that resulted in amino acid changes in their corresponding proteins. Here, we could demonstrate that several different S. maltophilia genotypes are present in CF patients and as a sign of adaption their mutation status switches over time to a less mutator phenotype without increasing resistance. These results suggest that S. maltophilia attempts to sustain its biological fitness as mechanism for long-term persistence in the CF lung.
Citation:
Adaptation of Stenotrophomonas maltophilia in cystic fibrosis: molecular diversity, mutation frequency and antibiotic resistance. 2014, 304 (5-6):613-9 Int. J. Med. Microbiol.
Journal:
International journal of medical microbiology : IJMM
Issue Date:
Jul-2014
URI:
http://hdl.handle.net/10033/332865
DOI:
10.1016/j.ijmm.2014.04.002
PubMed ID:
24836944
Type:
Article
Language:
en
ISSN:
1618-0607
Appears in Collections:
publications of the department experimental Virology([TC]EVIR)

Full metadata record

DC FieldValue Language
dc.contributor.authorVidigal, P Gen
dc.contributor.authorDittmer, Sen
dc.contributor.authorSteinmann, Een
dc.contributor.authorBuer, Jen
dc.contributor.authorRath, P-Men
dc.contributor.authorSteinmann, Jen
dc.date.accessioned2014-10-17T13:07:04Zen
dc.date.available2014-10-17T13:07:04Zen
dc.date.issued2014-07en
dc.identifier.citationAdaptation of Stenotrophomonas maltophilia in cystic fibrosis: molecular diversity, mutation frequency and antibiotic resistance. 2014, 304 (5-6):613-9 Int. J. Med. Microbiol.en
dc.identifier.issn1618-0607en
dc.identifier.pmid24836944en
dc.identifier.doi10.1016/j.ijmm.2014.04.002en
dc.identifier.urihttp://hdl.handle.net/10033/332865en
dc.description.abstractDue to the continuous exposure to a challenging environment and repeated antibiotic treatment courses, bacterial populations in cystic fibrosis (CF) patients experience selective pressure causing the emergence of mutator phenotypes. In this study we investigated the genotypic diversity, mutation frequency and antibiotic resistance of S. maltophilia isolates chronically colonizing CF patients. S. maltophilia was isolated from a total of 90 sputum samples, collected sequentially from 19 CF patients admitted between January 2008 and March 2012 at the University Hospital Essen, Germany. DNA fingerprinting by repetitive-sequence-based PCR revealed that 68.4% (n=13) of CF patients harbored different S. maltophilia genotypes during the 4-year study course. Out of 90 S. maltophilia isolates obtained from chronically colonized CF patients, 17.8% (n=16) were hypomutators, 27.7% (n=25), normomutators, 23.3% (n=21), weak hypermutators and 31.2% (n=28) strong hypermutators. We also found that mutation rates of the most clonally related genotypes varied over time with the tendency to become less mutable. Mutator isolates were found to have no significant increase in resistance against eight different antibiotics versus nonmutators. Sequencing of the mismatch repair genes mutL, mutS and uvrD revealed alterations that resulted in amino acid changes in their corresponding proteins. Here, we could demonstrate that several different S. maltophilia genotypes are present in CF patients and as a sign of adaption their mutation status switches over time to a less mutator phenotype without increasing resistance. These results suggest that S. maltophilia attempts to sustain its biological fitness as mechanism for long-term persistence in the CF lung.en
dc.language.isoenen
dc.rightsArchived with thanks to International journal of medical microbiology : IJMMen
dc.titleAdaptation of Stenotrophomonas maltophilia in cystic fibrosis: molecular diversity, mutation frequency and antibiotic resistance.en
dc.typeArticleen
dc.identifier.journalInternational journal of medical microbiology : IJMMen

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