integron

整合子
  • 文章类型: Journal Article
    在拉丁美洲,发现志贺氏菌病的疾病负担与对常用抗生素的耐药性迅速蔓延并存。抗生素抗性的分子基础在于质粒等遗传元件,转座子,积分子,基因组岛,等。,在细菌基因组中发现。已知获得积分,交换,并在基因盒内表达基因,并且假设它们在包括志贺氏菌在内的几种革兰氏阴性细菌中多药耐药基因的传播中起重要作用。一些研究已经描述了在拉丁美洲发现的耐多药志贺氏菌分离株中的抗生素抗性基因和整合子。例如,在巴西,玻利维亚,智利,哥斯达黎加和秘鲁,在志贺氏菌的多药耐药菌株中检测到1类和2类整合子;这种现象在对甲氧苄啶耐药的福氏杆菌分离株中更常见。磺胺甲恶唑,链霉素,氨苄青霉素,氯霉素,还有四环素.在耐磺胺类的志贺氏菌菌株中经常检测到的基因盒sul2,表明磺酰胺抗性表型可以通过独立于检测到的整合子类别的sul2基因的存在来解释。应注意,在这些研究中分析的所有分离物中sul3是阴性的。磺胺(由sul2编码)和甲氧苄啶耐药性的高频率可能是由于反复使用甲氧苄啶磺胺甲恶唑作为治疗志贺氏菌病的流行方案。观察到的志贺氏菌属菌株的耐药谱证实了氨苄西林和甲氧苄啶-磺胺甲恶唑作为治疗选择是无效的。需要有关该病原体中抗生素抗性机制的深入信息,以制定合适的干预策略。作为公共卫生战略的一部分,迫切需要将志贺氏菌的区域和局部抗微生物耐药性分析纳入其中。
    In Latin America, the disease burden of shigellosis is found to coexist with the rapid and rampant spread of resistance to commonly used antibiotics. The molecular basis of antibiotic resistance lies within genetic elements such as plasmids, transposons, integrons, genomic islands, etc., which are found in the bacterial genome. Integrons are known to acquire, exchange, and express genes within gene cassettes and it is hypothesized that they play a significant role in the transmission of multidrug resistance genes in several Gram-negative bacteria including Shigella. A few studies have described antibiotic resistance genes and integrons among multidrug resistant Shigella isolates found in Latin America. For example, in Brazil, Bolivia, Chile, Costa Rica and Peru, class 1 and class 2 integrons have been detected among multidrug resistant strains of Shigella; this phenomenon is more frequently observed in S. flexneri isolates that are resistant to trimethoprim, sulfamethoxazole, streptomycin, ampicillin, chloramphenicol, and tetracycline. The gene cassette sul2, which is frequently detected in Shigella strains resistant to the sulfonamides, suggests that the sulfonamide-resistant phenotype can be explained by the presence of the sul2 genes independent of the integron class detected. It is to be noted that sul3 was negative in all isolates analyzed in these studies. The high frequency of sulfonamide (as encoded by sul2) and trimethoprim resistance is likely to be a result of the recurrent use of trimethoprim sulfamethoxazole as a popular regimen for the treatment of shigellosis. The observed resistance profiles of Shigella strains confirm that ampicillin and trimethoprim-sulfamethoxazole are ineffective as therapeutic options. In-depth information regarding antibiotic resistance mechanism in this pathogen is needed in order to develop suitable intervention strategies. There is a pressing need for regional and local antimicrobial resistance profiling of Shigella to be included as a part of the public health strategy.
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