scholarly journals Point mutations in the 23S rRNA gene of Helicobacter pylori associated with different levels of clarithromycin resistance

1997 ◽  
Vol 40 (2) ◽  
pp. 283-286 ◽  
Author(s):  
J Versalovic
Keyword(s):  
Helicobacter Pylori ◽  
Point Mutations ◽  
23S Rrna ◽  
Rrna Gene ◽  
Clarithromycin Resistance ◽  
23S Rrna Gene ◽  
Different Levels

Prediction of Helicobacter Pylori Clarithromycin Resistance by Detection of Point Mutations in 23S rRNA Gene

2018 ◽  
Vol 27 (3) ◽  
pp. 13-20
Author(s):  
Hayam E. Rashed ◽  
Marwa A. Mansour ◽  
Mostafa A. Soltan ◽  
Tarek I. Zahir ◽  
Yasmin A. Fahmy
Keyword(s):  
Helicobacter Pylori ◽  
Point Mutations ◽  
23S Rrna ◽  
Rrna Gene ◽  
Clarithromycin Resistance ◽  
23S Rrna Gene

scholarly journals Molecular Assessment of Resistance to Clarithromycin in Helicobacter pylori Strains Isolated from Patients with Dyspepsia by Fluorescent In Situ Hybridization in the Center of Iran

2020 ◽  
Vol 2020 ◽  
pp. 1-7
Author(s):  
Jina Vazirzadeh ◽  
Jamal Falahi ◽  
Sharareh Moghim ◽  
Tahmineh Narimani ◽  
Rahmatollah Rafiei ◽  
...  
Keyword(s):  
Helicobacter Pylori ◽  
In Situ Hybridization ◽  
Point Mutations ◽  
23S Rrna ◽  
Rrna Gene ◽  
Clarithromycin Resistance ◽  
Genotypic Analysis ◽  
23S Rrna Gene ◽  
H Pylori

Background and Aims. Helicobacter pylori is a common infectious bacterium mostly found in gastroduodenal diseases. The increased prevalence of clarithromycin-resistant H. pylori strains is a major challenge in the successful treatment of infections caused by this organism. The present study is aimed at detecting the clarithromycin resistance pattern of H. pylori strains isolated from gastric biopsies and evaluating point mutations of the 23S rRNA gene. Patients and methods. In the present descriptive cross-sectional study, 165 patients with gastrointestinal disorders, who were referred to the Endoscopy Center of Dr. Shariati Hospital of Isfahan, Iran, were enrolled from April to July 2018. H. pylori infection was diagnosed by culture, and susceptibility of the isolates to clarithromycin was assessed by the E-test. Minimum inhibitory concentration (MIC) values were obtained based on EUCAST recommendations. Also, fluorescence in situ hybridization (FISH) was used to determine point mutations associated with clarithromycin resistance. Results. By using culturing, H. pylori was isolated from 50.3% (83/165) gastric biopsy specimens. The overall frequency of resistance to clarithromycin was 25.3% (21/83) by the E-test. In the resistance genotypic analysis, 19 isolates had mutations. The prevalence of A2143G and A2144G mutations was 68.4% (13/19) and 31.5% (6/19), respectively. A2143C mutation was not tracked in any isolate. Two isolates with MIC>0.5 μg/mL had no mutations that could be related to other mechanisms of resistance. Conclusion. As presented in the study, the high prevalence of clarithromycin-resistant H. pylori due to point mutations of the 23S rRNA gene indicates the necessity of revising the standard treatment regimen based on antibiotic susceptibility pattern of each region.

scholarly journals T2182C Mutation in 23S rRNA Is Associated with Clarithromycin Resistance in Helicobacter pylori Isolates Obtained in Bangladesh

2004 ◽  
Vol 48 (9) ◽  
pp. 3567-3569 ◽  
Author(s):  
Rasel Khan ◽  
Shamsun Nahar ◽  
Jinath Sultana ◽  
Mian Mashhud Ahmad ◽  
Motiur Rahman
Keyword(s):  
Helicobacter Pylori ◽  
Gene Sequence ◽  
Point Mutations ◽  
23S Rrna ◽  
Rrna Gene ◽  
Rrna Gene Sequence ◽  
Clarithromycin Resistance ◽  
Gene Sequence Analysis ◽  
23S Rrna Gene ◽  
Transition Mutation

ABSTRACT Twelve clarithromycin-resistant (MIC, ≥1 μg/ml) Helicobacter pylori isolates were analyzed for point mutations in the 23S rRNA gene. Sequence analysis of all of the resistant isolates revealed a T-to-C transition mutation at position 2182. Transformation experiments confirmed that a single T-to-C transition mutation at position 2182 is associated with clarithromycin resistance.

scholarly journals PCR-RFLP detection of point mutations A2143G and A2142G in 23S rRNA gene conferring resistance to clarithromycin in Helicobacter pylori strains.

2014 ◽  
Vol 61 (2) ◽  
Author(s):  
Karolina Klesiewicz ◽  
Paweł Nowak ◽  
Elżbieta Karczewska ◽  
Iwona Skiba ◽  
Izabela Wojtas-Bonior ◽  
...  
Keyword(s):  
Helicobacter Pylori ◽  
Point Mutations ◽  
Rflp Analysis ◽  
23S Rrna ◽  
Rrna Gene ◽  
Efficient Management ◽  
Clarithromycin Resistance ◽  
Pcr Rflp ◽  
23S Rrna Gene ◽  
H Pylori

The occurrence of clarithromycin resistance among Helicobacter pylori strains is a major cause of the treatment failure. Resistance to this drug is conferred by point mutations in 23S rRNA gene and the most prevalent mutations are A2143G and A2142G. The aim of the study was to evaluate the occurrence of A2143G and A2142G mutations in a group of H. pylori strains resistant to clarithromycin. The study included 21 clarithromycin-resistant H. pylori strains collected between 2006 and 2009 in southern Poland. Resistance to clarithromycin was quantitatively tested with the E-test to determine the minimal inhibitory concentration (MIC value). The point mutations of H. pylori isolates were detected by PCR followed by RFLP analysis. The MIC values for clarithromycin for the analyzed strains ranged from 1.5 mg/L to 64 mg/L. Nine H. pylori strains exhibited A2143G mutation and A2142G mutation was found in 9 isolates as well. The results of RFLP analysis of 3 clarithromycin-resistant strains were negative for both mutations. The average MIC values for A2143G and A2142G mutants were 6 and 30 mg/L, respectively. Frequencies of A2143G and A2142G mutations were the same in all isolates tested. Strains with A2143G mutation exhibited lower MIC values than A2142G mutants. Application of PCR-RFLP method for detection of clarithromycin resistance allows for better and more efficient management of H. pylori infections.

scholarly journals Clarithromycin resistance and 23s rrna gene point mutations of helicobacter pylori infection in children

2016 ◽  
Vol 58 (4) ◽  
pp. 371 ◽  
Author(s):  
Yeliz Çağan-Appak ◽  
Hörü Gazi ◽  
Semin Ayhan ◽  
Beyhan Cengiz-Özyurt ◽  
Semra Kurutepe ◽  
...  
Keyword(s):  
Helicobacter Pylori ◽  
Point Mutations ◽  
Helicobacter Pylori Infection ◽  
23S Rrna ◽  
Rrna Gene ◽  
Clarithromycin Resistance ◽  
23S Rrna Gene

STUDY ON POINT MUTATIONS AT POSITIONS 2132 AND 2143 IN 23S RRNA GENE OF HELICOBACTER PYLORI AMONG PATIENTS WITH CHRONIC GASTRITIS

2016 ◽  
pp. 12-20
Author(s):  
Thi Minh Thi Ha ◽  
Van Huy Tran ◽  
Viet Nhan Nguyen ◽  
Thanh Hoa Nguyen ◽  
Phan Tuong Quynh Le
Keyword(s):  
Helicobacter Pylori ◽  
Chronic Gastritis ◽  
Point Mutations ◽  
23S Rrna ◽  
Rrna Gene ◽  
Clarithromycin Resistance ◽  
Pcr Rflp ◽  
23S Rrna Gene ◽  
History Of ◽  
H Pylori

Background: Clarithromycin resistance in Helicobacter pylori has been found to be associated with point mutations at positions 2142 and 2143 in 23SrRNA gene. The aims of this study were: (1) to determine the rates of point mutations A2143G, A2142G and A2142C in 23SrRNA gene of H. pylori among patients with chronic gastritis by PCR-RFLP technique; and (2) to assessthe association between these mutations and some clinical, endoscopic and histopathological characteristics of chronic gastritis. Patients and methods: two hundreds and twenty six patients with H. pylori-positive chronic gastritis were determined A2143G, A2142G and A2142C mutations by PCR-RFLP technique with DNA extracted from endoscopic biopsy specimens of gastric mucosa. Results: The rate of point mutations at positions 2142 and 2143 in 23S rRNA gene of H. pylori was 35.4% in total, the A2143G and A2142G mutationsaccounted for 92.5% and 7.5% of all point mutations, respectively. No A2142C mutation was found. These mutations were not associated with age, gender,distribution of gastritis, and the presence of atrophic gastritis. The rate of A2143G mutation in groups with and without a history of clarithromycin treatment were 44.9% and 24.8%, respectively (p = 0,0065). The A2142G mutation was associated with intestinal metaplasia and/or dysplasia. Conclusion: The point mutations at positions 2142 and 2143 in 23S rRNA gene were found at a high rate in H. pylori strains amongpatients with chronic gastritis, with the absolute predominance of A2143G mutation. The A2143G mutation was associated with a history of clarithromycin treatment. Key words: 23S rRNA gene, Helicobacter pylori, A2143G, A2142G, A2142C mutation, clarithromycin resistance, chronic gastritis.

Clarithromycin‐resistance and point mutations in the 23S rRNA gene in Helicobacter pylori isolates from Japan

2000 ◽  
Vol 15 (8) ◽  
pp. 906-909 ◽  
Author(s):  
Noriko Umegaki ◽  
Tadashi Shimoyama ◽  
Daisuke Nishiya ◽  
Toshiyuki Suto ◽  
Shinsaku Fukuda ◽  
...  
Keyword(s):  
Helicobacter Pylori ◽  
Point Mutations ◽  
23S Rrna ◽  
Rrna Gene ◽  
Clarithromycin Resistance ◽  
23S Rrna Gene
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