Abstract
Metal(loid) selection contributes to selection pressure on antibiotic resistance, but to our knowledge, evidence of the dissemination of antibiotic resistance genes (ARGs) induced by metal(loid)s in mine soil ecosystems is rare. In the current study, using a high-throughput sequencing (HTS)-based metagenomic approach, 819 ARG subtypes were identified in a mine soil ecosystem, indicating that these environmental habitats are important reservoirs of ARGs. The results showed that metal(loid)-induced coselection has an important role in the distribution of soil ARGs. Furthermore, metal(loid) selection-induced ARGs were mainly associated with resistance-nodulation-division (RND) antibiotic efflux, which is distinct from what is observed in agricultural soil ecosystems. By using independent genome binning, metal(loid)s were shown impose coselection pressure on multiple ARGs residing on mobile genetic elements (MGEs), which promotes the dissemination of the antibiotic resistome. Interestingly, the current results showed that the density of several MGEs conferring ARGs was considerably higher in organisms most closely related to the priority pathogens Pseudomonas aeruginosa and Escherichia coli. Together, the results of this study indicate that mine soil ecosystems are important reservoirs of ARGs and that metal(loid)-induced coselection plays critical roles in the dissemination of ARGs in this type of soil habitat.
Key points
• Mining soil ecosystem is a reservoir of antibiotic resistance genes (ARGs).
• ARGs distribute via bacterial resistance-nodulation-division efflux systems.
• Metal(loid)s coselected ARGs residing on mobile genetic elements in P. aeruginosa and E. coli.
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Funding
This research was funded by the National Natural Science Foundation of China (41830753, 41807127, U1612442) and the Science and Technology Planning Project of Guangzhou (No. 202002020072).
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EZX and TFX contributed to the study conception and design. Material preparation, data collection, and analysis were performed by EZX, WMS, and ZPN. The first draft of the manuscript was written by EZX; YQW, JMD, WJF, FDM, and TFX commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Xiao, E., Sun, W., Ning, Z. et al. Occurrence and dissemination of antibiotic resistance genes in mine soil ecosystems. Appl Microbiol Biotechnol 106, 6289–6299 (2022). https://doi.org/10.1007/s00253-022-12129-0
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DOI: https://doi.org/10.1007/s00253-022-12129-0