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在Enterobacter cloacae复合体中,AMPC脱抑的突变率与物种或AMPC基因型之间的相关性
Lianyan Xie1, Yanrong Wu2, Qiulan Huang3
1Department of Laboratory Medicine, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
BMC microbiology
|September 24, 2025
概括
肠杆菌cloacae复合体 (ECC) 对于可诱导的AmpC产生具有很高的突变率,无论物种或基因型如何. 这造成了治疗失败的显著临床风险,第三代类的治疗失败.
科学领域:
- 微生物学 微生物学
- 遗传学 遗传学 是一个
- 临床医学 临床医学
背景情况:
- 研究了AMPC放缓突变率与对 ceftriaxone敏感的Enterobacter cloacae复合体 (ECC) 中的物种/基因型之间的相关性.
- 在2021年9月至2023年1月期间在上海瑞金医院采集的90个非重复的triaxone敏感ECC分离物进行了分析.
- 使用hsp60基因型定型和PCR分别用于物种和ampC识别.
研究的目的:
- 在各种ECC物种和基因型中确定AMPC放缓的突变率.
- 评估在ECC中诱导AMPC产生的临床影响.
- 为了研究潜在的物种或基因型特异性突变率的差异.
主要方法:
- 收集并鉴定了90个对氏素敏感的ECC分离物.
- 采用hsp60基因型和PCR用于物种和ampC识别.
- 在13个测序菌株上进行了卢里亚-德尔布鲁克波动分析,以确定AMPC脱压突变率.
主要成果:
- 最常见的物种是E. hormaechei (54.44%),其次是E. roggenkampii (12.22%) 和E. cloacae (11.11%).
- 在72个菌株中确定了blaACT,在13个菌株中确定了blaMIR,在5个菌株中确定了blaCMH.
- 在不同的物种和基因型中确定了不同的AMPC-减压突变率,没有明确的物种或基因型特异性趋势.
结论:
- 肠杆菌cloacae复合体 (ECC) 在可诱导的AmpC生产中表现出高的突变率.
- 根据ECC物种或AMPC基因型,没有观察到突变率的显著差异.
- 在患有可诱导的AmpC含ECC的患者中,第三代头素治疗失败的高风险.
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