Profile and actual transmissibility of Carbapenem resistance genes: Intracellular and extracellular DNA in hospital wastewater

被引：9

作者：

Zhang, Shengcen ^{[1
]}

Xu, Binbin ^{[1
]}

Chen, Mo ^{[2
]}

Zhang, Qianwen ^{[1
]}

Huang, Jiangqing ^{[1
]}

Cao, Yingping ^{[1
]}

Li, Bin ^{[1
]}

机构：

[1] Fujian Med Univ Union Hosp, Dept Clin Lab, 29 Xinquan Rd, Fuzhou 350001, Fujian, Peoples R China

[2] Fujian Med Univ Union Hosp, Fujian Inst Hematol, Fujian Prov Key Lab Hematol, Fuzhou 350001, Fujian, Peoples R China

来源：

JOURNAL OF ENVIRONMENTAL MANAGEMENT | 2023年 / 329卷

关键词：

Hospital wastewater; Carbapenem resistance genes; Metagenomics; Extracellular DNA; Plasmids; ACINETOBACTER SP ADP1; ANTIBIOTIC-RESISTANCE; HORIZONTAL TRANSFER; RISK-FACTORS; BACTERIA; ENTEROBACTERIACEAE; IDENTIFICATION; CHLORINATION; DIVERSITY; EFFLUENTS;

D O I：

10.1016/j.jenvman.2022.117085

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The current worldwide spread of carbapenem resistance genes (CRGs) has posed a major public health threat, which continues to grow in severity. Hospital wastewaters (HWWs) are major reservoirs for antibiotic resistance genes, while resistomes in HWWs are still poorly characterized when it comes to CRGs. We comprehensively characterized the profile and actual transmissibility of extracellular CRGs (eCRGs) and intracellular CRGs (iCRGs) in HWWs for the first time. In this study, CRGs showed similar relative abundance in treated and un-treated HWWs. Meanwhile, HWWs treatments led to the enrichment of blaIMP-8, probably attributed to the promotion of Novosphingobium and Prosthecobacter after treatment. To evaluate the transmission potential of CRGs, extracellular and intracellular carbapenem-resistant plasmids were captured from HWWs by trans-formation and conjugation, respectively. We found an interesting phenomenon regarding the transmission characteristics of CRGs: blaKPC-carrying plasmids could only be captured by transformation, while blaNDM-car-rying plasmids were captured by conjugation. Further experiments showed that HWW treatments increased the conjugation ability of blaNDM. In conclusion, our study demonstrated that HWWs are significant reservoirs of CRGs and various CRGs exhibit different modes of transmission in HWWs. CRGs cannot be removed by mem-brane bioreactor and chlorine disinfection. An urgent need is to develop more efficient wastewater treatments to limit CRG dissemination.

引用

页数：11

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