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在ST11 CRKP中,bla_KPC-2放大和一种新的mrcA突变驱动了sefiderocol异阻力

Yuxuan Liu¹, Hanxu Hong¹, QianBin Dai²

¹Department of Clinical Laboratory, The First Affiliated Hospital, Jiangxi Medical College, Nanchang University, Nanchang, PR China; School of Public Health, Jiangxi Medical College, Nanchang University, Nanchang, PR China.

International journal of antimicrobial agents

|December 3, 2025

概括

耐卡巴尼姆的Klebsiella pneumoniae (CRKP) 可以通过blaKPC-2放大和mrcA突变,发展出对 cefiderocol (FDC) 的异阻力. 这种双重机制可能导致治疗失败,并在临床环境中低估了耐药性.

科学领域:

微生物学微生物学
分子生物学分子生物学
抗微生物耐药性抗微生物耐药性

背景情况:

塞菲德罗科尔 (Cefiderocol,FDC) 是一种关键的治疗方法,用于治疗耐卡巴因的克莱布西拉肺炎 (CRKP) 感染.
新出现的对FDC的异体电阻 (HR) 对其临床有效性构成威胁.
了解CRKP中FDC-HR的分子基础对于有效的治疗策略至关重要.

研究的目的:

研究在体内进化过程中在CRKP中驱动FDC异阻的分子机制.
描述与FDC-HR出现相关的遗传和分子变化.
通过功能性测试验证已识别的机制.

主要方法:

对477个临床CRKP分离物的分析.
使用人口分析分析和抗菌素敏感性测试,对FDC异能耐药 (FDC-HR) 亚种群的表征.
分子技术包括定量PCR,转录组学,全基因组测序和CRISPR-Cas9功能验证.
分子建模用于预测FDC与突变蛋白结合.

主要成果:

在477个CRKP分离物中,12个 (2.52%) 呈现FDC-HR表型.
抗FDC的亚种群显示blaKPC-2等离子体拷贝数量增加和表达上调.
在mrcA中发现了一种G652A突变,影响FDC结合.
mrcA突变和blaKPC-2放大组合将FDC MIC从2升至32 mg/L,模仿临床异阻力.

结论:

在体内进化过程中,blaKPC-2等离子体拷贝数的放大和mrcA G652A突变是CRKP中FDC-HR的关键驱动因素.
这种耐药性机制可能会被标准敏感性测试低估,从而增加治疗失败的风险.
这些发现突显了检测异体电阻对于优化CRKP感染中的FDC治疗的重要性.

关键词:

耐卡巴胺的Klebsiella 肺炎菌是一种耐卡巴胺的菌种.在Cefiderocol的异电阻.等离子体拷贝数放大放大 bla (KPC-2) 的使用情况.这是一种Mrca突变.

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