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Influence of microplastics on antibiotic resistance genes across diverse environments: A comprehensive meta and machine-learning analysis
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This large-scale analysis examined how microplastics influence the spread of antibiotic resistance genes across different environments including intestines, wastewater sludge, plants, soil, and water. Researchers found that microplastics significantly boosted antibiotic resistance gene levels in gut, sludge, and plant settings, with particle size and concentration being the most important factors. The findings suggest that microplastic pollution may be helping spread antibiotic resistance, a serious public health concern, through multiple environmental pathways.
The coexistence of microplastics (MPs) and antibiotic resistance genes (ARGs) in various environments presents significant ecological risks. However, the influence of MPs properties and environmental conditions shaping ARG dynamics remain unclear. This study utilized meta- and interaction analysis to elucidate how MPs properties (size, concentration, type, and age) and exposure environments drive ARGs fluctuations. Key findings indicate that MPs significantly influenced ARGs abundance in intestinal, sludge, and plant environments, no pronounced effects were observed in soil or water and sediments. Among the MPs properties, size and concentration were the most influential factors, with their impacts varying considerably across environments. In intestinal settings, exposure time and MPs concentration drove ARG proliferation; while the concentration-size interactions of MPs shaped ARGs in sludge environments; MPs size was the primary influencing factor in plant environments, reflecting unique ARG dynamics in these contexts. The study also highlighted significant pairwise interactions, such as MPs concentration and size, underscoring the combined effects of these factors on ARG abundance. Despite these contributions, the study acknowledges limitations, including the limited analysis of aerosolized ARGs and more diverse MPs characteristics. These findings provide valuable insights into the ecological risks of MPs and ARGs and emphasize the importance of tailored mitigation strategies across different environments.
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By analyzing large-scale genetic datasets with machine learning, researchers found that the type of microplastic strongly influences which bacteria grow on it and which antibiotic resistance genes those bacteria carry. Surprisingly, biodegradable plastics like PLA (often marketed as eco-friendly) posed a higher risk of harboring antibiotic resistance genes than conventional plastics, raising concerns about resistance spreading through water systems to humans.
Size-specific effects of polyethylene microplastics (100–10,000 nm) on the soil resistome and pathogens revealed via metagenomics and machine learning
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Researchers incubated polyethylene microplastics of three different sizes in antibiotic-resistant soils and found that smaller particles had the strongest effect on spreading antibiotic resistance genes and increasing pathogen abundance. The microplastics altered soil chemistry, reduced beneficial enzyme activity, and promoted the growth of potentially harmful bacteria while decreasing beneficial species. The findings suggest that microplastic pollution in soils may worsen the spread of antibiotic resistance, with particle size playing a key role.
Microplastics enhance the enrichment and dissemination of antibiotic resistance genes in aquatic environments: A meta-analysis
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Tiny plastic particles in water aren't just pollution, this analysis of multiple studies found they nearly double the amount of antibiotic-resistant bacteria genes in aquatic environments, essentially acting as gathering spots where these genes multiply and spread more easily. This matters because antibiotic resistance is already a major public health threat, and if microplastics in our waterways are helping resistant bacteria thrive and share their resistance traits, that could make infections harder to treat down the line, especially since smaller plastic particles seemed to make the problem worse.
Distinct accumulation and dissemination of intracellular and extracellular antibiotic resistance genes in nitrifying sludge under different microplastic stresses
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Scientists found that different types of microplastics in wastewater treatment plants can boost antibiotic-resistant bacteria in different ways, some plastics helped resistant genes spread more easily between bacteria, making the problem harder to contain. This matters because wastewater treatment plants are supposed to help protect us from pollution, but these findings suggest the type of plastic contamination present could affect how much antibiotic resistance ends up back in our environment, potentially making infections harder to treat down the line.
[Influencing Factors and Mechanisms of Antibiotic Resistance Gene Enrichment by Microplastics in the Environment].
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This review examines how microplastics in the environment serve as carriers for antibiotic resistance genes, enriching and spreading resistant bacteria across air, soil, water, and sediments. Researchers found that the type, surface characteristics, and aging of microplastics all influence how effectively they accumulate resistance genes and facilitate horizontal gene transfer. The findings highlight the need to consider microplastics as an important vector in the environmental spread of antibiotic resistance.
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