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抗生素耐药基因和 intI1 在猪污水处理厂的流行情况及其与金属耐药性、细菌群落和废水参数的相关性。

Antibiotic resistance genes and intI1 prevalence in a swine wastewater treatment plant and correlation with metal resistance, bacterial community and wastewater parameters.

机构信息

College of Environment Science and Engineering, Nanjing Tech University, 211816 Nanjing, Jiangsu, China.

College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, 211816 Nanjing, Jiangsu, China.

出版信息

Ecotoxicol Environ Saf. 2018 Oct;161:251-259. doi: 10.1016/j.ecoenv.2018.05.049. Epub 2018 Jun 7.

Abstract

The livestock wastewater treatment plant represents an important reservoir of antibiotic resistance determinants in the environment. The study explored the prevalence of five antibiotic resistance genes (ARGs, including sulI, tetA, qnrD, mphB and mcr-1) and class 1 integron (intI1) in a typical livestock wastewater treatment plant, and analyzed their integrated association with two metal resistance genes (copA and czcA), two pathogens genes (Staphylococcus and Campylobacter), bacterial community and wastewater properties. Results indicated that all investigated genes were detected in the plant. The treatment plant could not completely remove ARGs abundances, with up to 2.2 × 10~3.7 × 10 copies/L of them remaining in the effluent. Mcr-1 was further enriched by 27-fold in the subsequent pond. The correlation analysis showed that mphB significantly correlateed with tetA and intI. Mcr-1 strongly correlated with copA. MphB and intI significantly correlated with czcA. The correlations implied a potential co-selection risk of bacterial resistant to antibiotics and metals. Redundancy analyses indicated that qnrD and mcr-1 strongly correlated with 13 and 14 bacterial genera, respectively. Most ARGs positively correlated to wastewater nutrients, indicating that an efficient reduction of wastewater nutrients would contribute to the antibiotic resistance control. The study will provide useful implications on fates and reductions of ARGs in livestock facilities and receiving environments.

摘要

养殖场废水处理厂是环境中抗生素抗性决定因素的重要储存库。本研究探讨了在典型的养殖场废水处理厂中五种抗生素抗性基因(包括 sulI、tetA、qnrD、mphB 和 mcr-1)和类 1 整合子(intI1)的流行情况,并分析了它们与两种金属抗性基因(copA 和 czcA)、两种病原体基因(葡萄球菌和弯曲杆菌)、细菌群落和废水特性的综合关联。结果表明,该植物中检测到了所有研究的基因。处理厂无法完全去除 ARG 丰度,其中多达 2.2×10~3.7×10 个拷贝/L 的 ARG 残留在废水中。随后在池塘中 mcr-1 进一步富集了 27 倍。相关分析表明,mphB 与 tetA 和 intI 显著相关。mcr-1 与 copA 强烈相关。mphB 和 intI 与 czcA 显著相关。相关性表明了细菌对抗生素和金属的抗性存在潜在的共同选择风险。冗余分析表明,qnrD 和 mcr-1 与 13 和 14 个细菌属分别具有强烈的相关性。大多数 ARG 与废水营养物质呈正相关,表明有效减少废水中的营养物质将有助于控制抗生素抗性。本研究将为养殖场设施和接收环境中 ARG 的命运和减少提供有用的启示。

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