Simultaneous colonisation of Helicobacter pylori with and without mutations in the 23S rRNA gene in patients with no history of clarithromycin exposure. Issue 4 (1st October 1999)

• Record Type: Journal Article
• Authors: Matsuoka, M; Yoshida, Y; Hayakawa, K; Fukuchi, S; Sugano, K
• Is Part Of: Gut. Volume 45:Issue 4(1999)
• Page Start: 503
• Page End: 507
• Publication Date: 1999-10-01
• Subjects: Helicobacter pylori -- clarithromycin resistance -- 23S rRNA gene -- point mutation -- mixed strain colonisation; Gastroenterology -- Periodicals; 616.33
• DOI: 10.1136/gut.45.4.503
• Languages: English
• ISSNs: 0017-5749

Abstract

Abstract : BACKGROUND: It was recently reported that A to G transition mutations at positions 2143 and 2144 in the 23S rRNA gene are associated with clarithromycin resistance in Helicobacter pylori . AIMS: To study the incidence and mechanism of development of clarithromycin resistance by analysing these mutations. SUBJECTS: Eighty two H pylori positive patients who had an endoscopic examination and no history of treatment with macrolide antibiotics. METHODS: Clarithromycin resistance was screened for by polymerase chain reaction-restriction fragment length polymorphism of the 23S rRNA gene coupled with antibiotic susceptibility testing. In clinical isolates with mutations or resistance, mutations in individual colonies were analysed by direct sequencing. RESULTS: Of the 79 amplicons (DNA fragments amplified by polymerase chain reaction), Alw 26I and Mbo II digestion disclosed the mutation in four (5%) and one (1%) respectively. However, the Alw 26I cleavage was incomplete in two of the four amplicons, as was the Mbo II cleavage. Individual colony analysis of the isolates with incomplete cleavage patterns showed the presence of both wild type and mutated strains in the 23S rRNA genes. CONCLUSIONS: Both clarithromycin sensitive and resistant strains colonised in some patients with no history of exposure to macrolides. The results suggest that resistant strains may not be formed but selected by clarithromycin administration.