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Mechanisms of Resistance

Discriminatory Detection of Inhibitor-Resistant β-Lactamases in Escherichia coli by Single-Strand Conformation Polymorphism-PCR

Valérie Speldooren, Beate Heym, Roger Labia, Marie-Hélène Nicolas-Chanoine
Valérie Speldooren
Microbiology Department, Hôpital Ambroise-Paré, Université Paris V, 92100 Boulogne-Billancourt, and
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Beate Heym
Microbiology Department, Hôpital Ambroise-Paré, Université Paris V, 92100 Boulogne-Billancourt, and
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Roger Labia
UMR 175 CNRS, Musée National d’Histoire Naturelle, 29000 Quimper, France
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Marie-Hélène Nicolas-Chanoine
Microbiology Department, Hôpital Ambroise-Paré, Université Paris V, 92100 Boulogne-Billancourt, and
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DOI: 10.1128/AAC.42.4.879
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ABSTRACT

Plasmid-mediated mechanisms, comprising TEM hyperproduction, TEM derivative production, and OXA production, lead to amoxicillin-clavulanic acid resistance in enterobacteria. The ability of the single-strand conformation polymorphism (SSCP)-PCR method to differentiate the genes encoding inhibitor-resistant β-lactamases was evaluated with three blaTEM primer pairs. TheblaTEM genes, which were known to be different on the basis of their nucleotide sequences (blaTEM-1A, blaTEM-1B,blaTEM-2, blaTEM-30,blaTEM-32, andblaTEM-35), were identified as different by their electrophoretic mobilities. TheblaTEM-33, blaTEM-34,blaTEM-36, blaTEM-37,blaTEM-38, andblaTEM-39 genes, whose sequence differences have been established by oligotyping, displayed different SSCP profiles for different fragments, suggesting genetic differences in addition to those defined by oligotyping. Confirmed by sequencing, these additional genetic events concerned silent mutations at certain positions and, notably, a G→T transversion at position 1 of the −10 consensus sequence in blaTEM-34,blaTEM-36, blaTEM-37, and blaTEM-39. Applied to eight clinical isolates of Escherichia coli resistant to amoxicillin-clavulanic acid, the SSCP method detected TEM-1 in three strains and TEM-30, TEM-32, and TEM-35 in three other strains, respectively. A novel TEM derivative (TEM-58) was detected in another strain, and the deduced amino acid sequence showed two substitutions: Arg244Ser, which is known to confer amoxicillin-clavulanic acid resistance in TEM-30, and Val261Ile, which has not been described previously. The eighth strain produced an OXA β-lactamase. Given the discriminatory power and the applicability of SSCP-PCR, this method can be proposed as a means of following the evolution of the frequencies of the different inhibitor-resistant β-lactamases.

  • Copyright © 1998 American Society for Microbiology
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Discriminatory Detection of Inhibitor-Resistant β-Lactamases in Escherichia coli by Single-Strand Conformation Polymorphism-PCR
Valérie Speldooren, Beate Heym, Roger Labia, Marie-Hélène Nicolas-Chanoine
Antimicrobial Agents and Chemotherapy Apr 1998, 42 (4) 879-884; DOI: 10.1128/AAC.42.4.879

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Discriminatory Detection of Inhibitor-Resistant β-Lactamases in Escherichia coli by Single-Strand Conformation Polymorphism-PCR
Valérie Speldooren, Beate Heym, Roger Labia, Marie-Hélène Nicolas-Chanoine
Antimicrobial Agents and Chemotherapy Apr 1998, 42 (4) 879-884; DOI: 10.1128/AAC.42.4.879
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KEYWORDS

Enzyme Inhibitors
Escherichia coli
beta-lactamase inhibitors
beta-lactamases

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