Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, 610041, China.
Environ Sci Pollut Res Int. 2020 Aug;27(23):29191-29203. doi: 10.1007/s11356-020-09287-x. Epub 2020 May 20.
Antibiotic resistance genes (ARGs) in rural environments have been poorly characterized in the literature. In this study, the diversity, abundance, and distribution of ARGs in surface waters, soils, and sediments of a typical hilly rural area in the Upper Yangtze River watershed were investigated using the high-throughput quantitative polymerase chain reaction, and their relationships with chemical properties of the samples were analyzed. No significant differences in the diversity and abundance of ARGs were observed among the three medium types while the ARG distribution pattern in the sediments was obviously different from that of the surface waters. According to the co-occurrence pattern of ARGs subtypes obtained by network analysis, blaOXA10-02, blaPSE, lnuB-02, and qacEΔ1-01 can be used to estimate the relative abundance of total ARGs for the study area. It appeared that the prevalence of ARGs in the sediments was promoted by the horizontal gene transfer (HGT) and vertical gene transfer together, while their spread in the surface waters and soils were facilitated by the supply of biogenic elements and HGT, respectively. Mobile genetic elements (MGEs) were abundant and detected in all samples, and their abundance was significantly and positively correlated with that of ARGs, implying that the potential horizontal transfer of ARGs to other bacteria and pathogens in rural environments should not be overlooked.
抗生素耐药基因(ARGs)在农村环境中的研究还很少。本研究采用高通量定量聚合酶链式反应(qPCR)技术,调查了长江上游典型丘陵农村地区地表水、土壤和沉积物中 ARGs 的多样性、丰度和分布,并分析了其与样品化学性质的关系。虽然三种介质类型之间的 ARGs 多样性和丰度没有显著差异,但沉积物中的 ARG 分布模式明显不同于地表水。通过网络分析获得的 ARGs 亚类的共现模式表明,blaOXA10-02、blaPSE、lnuB-02 和 qacEΔ1-01 可用于估计研究区域总 ARGs 的相对丰度。似乎 HGT 和垂直基因转移共同促进了沉积物中 ARGs 的流行,而生物元素和 HGT 分别促进了它们在地表水和土壤中的传播。移动遗传元件(MGEs)在所有样品中都很丰富且被检测到,其丰度与 ARGs 呈显著正相关,这表明 ARGs 向农村环境中的其他细菌和病原体的水平转移的潜力不容忽视。