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Microplastics exhibit accumulation and horizontal transfer of antibiotic resistance genes
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Researchers investigated whether microplastics in wastewater treatment plants can accumulate and spread antibiotic resistance genes. They found that bacteria growing on microplastic surfaces in treatment tanks harbored antibiotic resistance genes and transferred them at higher rates than bacteria in the surrounding water. This suggests microplastics in wastewater systems may serve as hotspots for spreading antibiotic resistance, posing potential risks to both ecosystems and human health.
Although the fates of microplastics (0.1-5 mm) in marine environments and freshwater are increasingly studied, little is known about their vector effect in wastewater treatment plants (WWTPs). Previous studies have evaluated the accumulation of antibiotic resistance genes (ARGs) on microplastics, but there is no direct evidence for the selection and horizontal transfer of ARGs on different microplastics in WWTPs. Here, we show biofilm formation as well as bacterial community and ARGs in these biofilms grown on four kinds of microplastics via incubation in the aerobic and anaerobic tanks of a WWTP. Microplastics showed differential capacities for bacteria and ARGs enrichment, differing from those of the culture environment. Furthermore, ARGs in microplastic biofilms were horizontally transferred at frequencies higher than those in water samples in both tanks. Therefore, microplastics in WWTPs can act as substrates for horizontal transfer of ARGs, potentially causing a great harm to the ecological environment and adversely affecting human health.
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