Migration of antibiotic resistance genes and evolution of flora structure in the Xenopus tropicalis intestinal tract with combined exposure to roxithromycin and oxytetracycline

Lin, Xinhua; Xu, Yanbin; Han, Ruiqi; Luo, Wenshi; Zheng, Li

doi:10.1016/j.scitotenv.2022.153176

Cited by 14 publications

(1 citation statement)

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“…Proteobacteria include major nitrogen-removal functional bacteria, such as nitroso bacteria, nitrifying bacteria and denitrifying bacteria [48,49]. Under oxytetracycline stress, these bacteria may develop resistance or acquire resistance genes through horizontal gene transfer [50,51]. Yang [52] reported that the use of tetracycline antibiotics inhibited the growth of soil bacteria and actinomycetes, significantly reduced the soil microbial biomass and promoted an increase in soil fungi.…”

Section: Discussionmentioning

confidence: 99%

Effects of Three Antibiotics on Nitrogen-Cycling Bacteria in Sediment of Aquaculture Water

Li,

He,

Ding

et al. 2024

Water

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Antibiotics are commonly used to prevent and control aquaculture diseases. However, long-term overuse of antibiotics not only leaves residues but also leads to changes in the nitrogen cycle in water, which threatens the survival of aquaculture organisms. The current results showed that sulfamethoxazole had no significant effect on the nitrogen cycle process in the actual aquaculture concentration. The inhibitory effect of 1.05 mg/L norfloxacin on ammonia-oxidizing bacteria was significantly greater than that on ammonia-oxidizing archaea, and the gene abundance of AOB amoA on the 14th day increased by 2.48 times compared with the 7th day. Under the influence of 3.9 mg/L oxytetracycline, the gene abundance of AOB amoA decreased significantly, while the number of AOA amoA genes increased, suggesting that there may be functional redundancy between AOA and AOB. At the genus level in the norfloxacin group, the relative abundance of Sva0485 increased by 14.0% on the 7th day compared with the control group but decreased 12.77% in the addition group. The relative abundance of Firmicutes, another dominant species in the oxytetracycline group, was 25.9%. This study shows that the addition of antibiotics may have a negative effect on the nitrogen-cycling microorganisms in aquaculture water.

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