耐卡巴胺抗性Acinetobacter baumannii分离物的分子和毒性特征:一个前性队列研究
Seung Min Park1, Jin Woong Suh2, Yong Kuk Ju1
1Institute of Emerging Infectious Diseases, Korea University, Seoul, Republic of Korea.
Scientific reports
|November 9, 2023
概括
在韩国,抗卡巴因的Acinetobacter baumannii (CRAB) 感染与高死亡率有关. 这项研究确定了关键的毒性基因和序列类型,其中ST191是最常见的. 一个粉虫模型显示ST195显著增加了死亡率.
科学领域:
- 医学微生物学 医学微生物学
- 传染性疾病 传染性疾病
- 抗微生物耐药性 抗微生物耐药性
背景情况:
- 耐卡巴胺的宝曼尼菌 (CRAB) 构成了全球严重的健康威胁,特别是在医院环境中.
- 了解CRAB的分子特征和毒性因素对于开发有效的治疗和控制策略至关重要.
- CRAB细菌症与高发病率和死亡率有关,需要对其临床影响进行进一步调查.
研究的目的:
- 从血液培养物中鉴定临床CRAB分离物的分子特征和毒性概况.
- 为了确定在CRAB分离物中特定毒性基因和序列类型的流行率.
- 使用Tenebrio molitor感染模型评估不同CRAB序列类型的毒性.
主要方法:
- 从2015年7月至2021年7月期间,从患有CRAB细菌病的成年患者中收集临床CRAB分离物.
- 使用实时聚合酶链反应检测了13个毒性基因.
- 通过多部位序列类型 (MLST) 来对CRAB分离物的基因定型.
- 使用Tenebrio molitor生存模型对CRAB毒性的评估.
主要成果:
- 所有170个CRAB分离物都携带了blaOXA-23和blaOXA-51基因.
- 确定了11种CRAB序列类型 (ST),其中ST191占主导地位 (25.7%).
- 检测到的关键毒性基因包括bap (92.4%),ompA (77.1%),basD (58.9%) 和espA (15.9%).
- 坦尼布里奥 molitor 模型表明,ST195 隔离物与其他STs相比,死亡率显著更高 (73.3%).
结论:
- 韩国的CRAB血液分离物表现出特定的分子和毒性特征,与高的住院死亡率 (57.6%) 有关.
- ST191是主要的CRAB序列类型,ST195在Tenebrio molitor模型中显示出增强的毒性.
- 芽虫模型作为一种潜在的工具来表征CRAB病毒性,指导进一步研究影响临床结果的机制.
更多相关视频
07:41Author Spotlight: A Comprehensive Protocol for Acinetobacter Biofilm Quantification, Assessment, and Visualization
Published on: August 4, 2023
3.4K
05:06Author Spotlight: Advancing Antibiotic Resistance Research Using an Efflux-Deficient Bacterial Strain and a Single-Copy Gene Expression System
Published on: January 5, 2024
633
相关概念视频
Mechanism of Antibiotic Resistance in MRSA
Antibiotic resistance in bacteria arises when microorganisms evolve the ability to withstand drugs designed to kill them or inhibit their growth, rendering once-effective treatments useless. This phenomenon, driven by genetic change and selection under antibiotic exposure, poses a profound threat to modern medicine. Mechanisms include drug-inactivating enzymes (e.g., β-lactamases), efflux pumps that eject antibiotics, mutations altering antibiotic targets, decreased drug uptake, and acquisition...
Clinical Significance of Antibiotic Resistance
Methicillin-resistant Staphylococcus aureus (MRSA) presents a critical public health threat, arising from its capacity to resist β-lactam antibiotics due to acquisition of the mecA gene within the staphylococcal cassette chromosome mec (SCCmec). This gene encodes penicillin-binding protein 2a (PBP2a), which impairs binding efficacy of methicillin and other β-lactams. MRSA has evolved into distinct clonal lineages impacting humans and animals alike, reinforcing its significance within the One...
