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Title: Insight into co-hosts of nitrate reduction genes and antibiotic resistance genes in an urban river of the qinghai-tibet plateau

Journal Article · · Water Research
 [1];  [1];  [2];  [1];  [3]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [1]
  1. Peking Univ., Beijing (China); State Environmental Protection Key Laboratory of All Material Fluxes in River Ecosystems, Beijing (China)
  2. Fujian Agriculture and Forestry University, Fuzhou (China)
  3. Qinghai University, Xining (China)
  4. Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Washington State Univ., Richland, WA (United States)
  5. Clemson Univ., SC (United States)

Microbial co-hosts of nitrate reduction genes (NRGs) and antibiotic resistance genes (ARGs) have been recently reported, but their ecology and biochemical role in urban waterways remain largely unknown. Here, we collected 69 surface water and sediment samples in the Huangshui River on the Qinghai-Tibet Plateau during the wet and dry season associated with comparatively low and high antibiotic levels. Using metagenomic sequencing, we retrieved 278 medium-to-high-quality metagenome-assembled genomes (MAGs) of NRG-ARG co-hosts, mainly belonging to the phyla Proteobacteria, Actinobacteriota, and Bacteroidota. Of microorganisms carrying ARGs, a high proportion (75.3?94.9%) also encoded NRGs, supporting nitrate reducing bacteria as dominant hosts of ARGs. Seasonal changes in antibiotic levels corresponded to significant variation in the relative abundance and community composition of NRG-ARG co-host in both water and sediments, resulting in a concomitant change in antibiotic resistance pathways. In contrast, the contribution of NRG-ARG co-hosts to nitrate reduction was stable between seasons. Further, we identify specific antibiotics (e.g., sulphonamides) and microbial taxa (e.g., Acinetobacter and Hafnia) that may disproportionately impact these relationships to serve as a basis for laboratory investigations into bioremediation strategies. Our study suggests that highly abundant nitrate reducing microorganisms in contaminated environments may also directly impact human health as carriers of antibiotic resistance.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE; National Natural Science Foundation of China (NSFC); Natural Science Foundation of Qinghai Province; USDA National Institute of Food and Agriculture (NIFA)
Grant/Contract Number:
AC05-76RL01830; 51925901; 52070002; 2019-ZJ-952Q
OSTI ID:
1895126
Report Number(s):
PNNL-SA-172262
Journal Information:
Water Research, Vol. 225; ISSN 0043-1354
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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