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Mohammad Kargar 2 Articles
Molecular Investigation of Quinolone Resistance of Quinolone Resistance-Determining Region in Streptococcus pneumoniae Strains Isolated from Iran Using Polymerase Chain Reaction–Restriction Fragment Length Polymorphism Method
Mohammad Kargar, Fataneh Moein Jahromi, Abbas Doosti, Somayeh Handali
Osong Public Health Res Perspect. 2014;5(5):245-250.   Published online October 31, 2014
DOI: https://doi.org/10.1016/j.phrp.2014.08.010
  • 1,941 View
  • 21 Download
  • 1 Citations
AbstractAbstract PDF
Objectives
The resistance of Streptococcus pneumoniae to the recently available antibiotic treatment has been a growing problem. The aim of the study was to determine the quinolone-resistant strains and detect the presence of mutations in the quinolone resistance-determining regions of the gyrA, parE, and parC genes.
Methods
In this study, for the first time in Iran, the polymerase chain reaction–restriction fragment length polymorphism (PCR-RFLP) method was used to investigate the presence of mutations at quinolone resistance-determining regions of topoisomerase IV and DNA gyrase on 82 S. pneumoniae strains, among them 45 clinical samples were from patients and 37 from healthy carriers (control group).
Results
In clinical samples, 34 (75.56%) strains contained mutations in the parC gene, 31 (68.89%) carried mutations in the gyrA gene, and 14 (31.11%) had parE gene mutations. Antibiotic susceptibility test was performed using the CLSI (Clinical and Laboratory Standards Institute) criteria on three different generations of quinolone family, with nalidixic acid (82.22%) showing the highest resistance and levofloxacin (42.22%) the least resistance.
Conclusion

Results
indicated that there is a significant correlation between quinolone resistance development and mutations in the parE gene as well as in the parC and gyrA genes.

Citations

Citations to this article as recorded by  
  • Mutant selection window of four quinolone antibiotics against clinical isolates of Streptococcus pneumoniae , Haemophilus influenzae and Moraxella catarrhalis
    Hajime Nakai, Takumi Sato, Takashi Uno, Emiko Furukawa, Masato Kawamura, Hiroshi Takahashi, Akira Watanabe, Shigeru Fujimura
    Journal of Infection and Chemotherapy.2018; 24(2): 83.     CrossRef
High Prevalence of Class 1 to 3 Integrons Among Multidrug-Resistant Diarrheagenic Escherichia coli in Southwest of Iran
Mohammad Kargar, Zahra Mohammadalipour, Abbas Doosti, Shahrokh Lorzadeh, Alireza Japoni-Nejad
Osong Public Health Res Perspect. 2014;5(4):193-198.   Published online August 31, 2014
DOI: https://doi.org/10.1016/j.phrp.2014.06.003
  • 2,187 View
  • 22 Download
  • 34 Citations
AbstractAbstract PDF
Objectives
Horizontal transfer of integrons is one of the important factors that can contribute to the occurrence of multidrug-resistant (MDR) bacteria. This study aimed to determine the prevalence of integrons among MDR Escherichia coli strains isolated from stool specimens and investigate the associations between the existence of integrons and MDR properties in the southwest of Iran.
Methods
There were 164 E. coli strains isolated from January 2012 to June 2012. Fecal specimens identified as E. coli by the conventional methods. Subsequently the antibiotic resistance was assessed using Clinical and Laboratory Standard Institute criteria. The presence of class 1–3 integrons and embedded gene cassettes was verified using specific primers by multiplex polymerase chain reaction assay.
Results
Among a total of 164 studied samples, 69 (42.07%) isolates were multidrug resistant. Class 1 and class 2 integrons were present in 78.26% and 76.81% MDR isolates, respectively. For the first time in Iran, class 3 integron was observed in 26.09% MDR isolates. Significant correlations were identified between: class 1 integron and resistance to amikacin, gentamicin, chloramphenicol, ampicillin, tetracycline, nalidixic acid, and co-trimoxazole; class 2 integron and resistance to aminoglycosides, co-trimoxazole, cefalexin, ampicillin, and chloramphenicol; and class 3 integron and resistance to gentamicin, kanamycin, and streptomycin.
Conclusion
Our results indicate that integrons are common among MDR isolates and they can be used as a marker for the identification of MDR isolates. Therefore, due to the possibility of a widespread outbreak of MDR isolates, molecular surveillance and sequencing of the integrons in other parts of the country is recommended.

Citations

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    Science of The Total Environment.2022; 820: 153176.     CrossRef
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    Antibiotics.2021; 10(11): 1333.     CrossRef
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