Tetracycline resistance in Chilean clinical isolates of Helicobacter pylori.

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Toledo H, Lopez-Solis R

Tetracycline resistance in Chilean clinical isolates of Helicobacter pylori.

J Antimicrob Chemother. 2010 Mar;65(3):470-3. doi: 10.1093/jac/dkp457. Epub 2009 Dec 24.

PubMed ID

20035020 [ View in PubMed

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Abstract

OBJECTIVES: Since high-level tetracycline resistance in Helicobacter pylori has been associated with a AGA926-928-->TTC substitution in the 16S rRNA genes rrnA/B, the aim of the study was to screen for tetracycline resistance in H. pylori clinical isolates obtained from Santiago, Chile by using a recently reported molecular assay. METHODS: A PCR-restriction fragment length polymorphism (PCR-RFLP) assay of the conserved 535 bp region of the H. pylori 16S rRNA genes rrnA/B (between nucleotides 710 and 1245) using HinfI was followed by DNA sequencing of the same fragment obtained from tetracycline-resistant H. pylori clinical isolates. RESULTS: The PCR-RFLP assay revealed that the tetracycline-resistant H. pylori isolates lacked the AGA926-928-->TTC substitution. In contrast, DNA sequencing of the 535 bp PCR fragment from 11 tetracycline-resistant H. pylori Chilean clinical isolates showed an association of low-level tetracycline resistance with 1 bp (A928C) or 2 bp (AG926-927-->GT and/or A926G/A928C) substitutions in both 16S rRNA genes. CONCLUSIONS: The PCR-RFLP (HinfI) assay alone is unreliable for the detection of tetracycline resistance in Chilean clinical isolates of H. pylori. To that end, it must be complemented by sequencing of the 535 bp PCR fragment.

DrugBank Data that Cites this Article

Drug Targets

Drug	Target	Kind	Organism	Pharmacological Action	Actions
Clomocycline	16S ribosomal RNA	Nucleotide	Enteric bacteria and other eubacteria	No	Inhibitor	Details