ChromosomalampCmutations in cefpodoxime-resistant, ESBL-negative uropathogenicEscherichia coli
| ISSN: | 0967-4845 |
|---|---|
| DOI: | 10.1080/09674845.2015.11666789 |
| Přístupová URL adresa: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::31928eb5ba629765ce936e669d107e10 https://doi.org/10.1080/09674845.2015.11666789 |
| Rights: | OPEN |
| Přírůstkové číslo: | edsair.doi.dedup.....31928eb5ba629765ce936e669d107e10 |
| Autor: | P C L Moore, Dawn L. Arnold, J A Lewis, L M Lawrance |
| Rok vydání: | 2015 |
| Předmět: |
Adult
Male 0301 basic medicine Microbiology (medical) Adolescent 030106 microbiology Clinical Biochemistry Immunology Drug resistance Biology medicine.disease_cause Microbiology beta-Lactamases Young Adult 03 medical and health sciences Plasmid Bacterial Proteins Genotype polycyclic compounds medicine Humans Uropathogenic Escherichia coli Immunology and Allergy Child Promoter Regions Genetic Escherichia coli Aged Aged 80 and over Genetics Mutation Cephalosporin Resistance Transition (genetics) Point mutation Biochemistry (medical) Ceftizoxime Infant Promoter Chromosomes Bacterial Middle Aged biochemical phenomena metabolism and nutrition bacterial infections and mycoses Anti-Bacterial Agents 030104 developmental biology Infectious Diseases Child Preschool |
| Zdroj: | British Journal of Biomedical Science. 72:7-11 |
| ISSN: | 0967-4845 |
| DOI: | 10.1080/09674845.2015.11666789 |
| Popis: | AmpC β-lactamase is an enzyme commonly produced by Escherichia coli that causes resistance to cephalosporins and penicillins. Enzyme production is controlled by the strength of the promoter encoded by the chromosomal ampC gene, with the level of production affected by the presence of certain mutations in this region. This study sets out to determine the prevalence of ampC promoter mutations present in a group of uropathogenic E. coli strains. A total of 50 clinical strains of E. coli were collected from urine samples between June 2011 and November 2011. Strains were investigated for the presence of mutations in the chromosomal ampC promoter region by amplification and sequencing of a 271 bp product. The presence of ampC-carrying plasmids derived from other species was also determined, to exclude these from further analysis. ampC-carrying plasmids were found in 10 of the 50 strains, all of which were of the CIT-type. Analysis of the chromosomal ampC promoter region in the 40 remaining strains showed mutations at 16 different positions, with 18 different genotype patterns detected overall. The most common ampC chromosomal mutation, present in 25 of 40 strains, was a T --> A transition at position -32. This mutation has been shown by others to increase enzyme production by up to 46-fold. Altogether, three separate mutations (-32, -42 and -13ins) were present in 90% of the 40 non-plasmid strains, indicating a strong association with the resistance observed. It appears, therefore, that the majority of AmpC-mediated resistance in E. coli can be accounted for by just three point mutations in the chromosome. |
| Databáze: | OpenAIRE |
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