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Plastisphere as a resistome incubator: Substrate biodegradability escalates compounded genetic risks
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Scientists found that microplastics, especially "biodegradable" ones, can become breeding grounds for bacteria carrying antibiotic resistance genes, sometimes even more than regular plastics. These bacteria also picked up traits that help them spread resistance and cause infections, suggesting that eco-friendly plastics may not be as harmless to health as assumed.
Plastispheres formed on microplastics represent unique hotspots for antibiotic-resistant bacteria, yet how substrate biodegradability shapes resistome profiles remains unclear. To address this gap, this study evaluated the resistome and its associated mobility and pathogenicity risks across nine polymer-specific plastispheres and the surrounding water. Results showed that antibiotic resistance gene (ARG) enrichment was widespread across plastispheres formed on all tested substrates, following a biodegradability-driven gradient that peaked in polyhydroxyalkanoate (PHA). This enrichment was systematically coupled with the co-accumulation of mobile genetic elements (MGEs) and virulence factor genes (VFGs). Host-resolved analysis revealed the selective enrichment of high-risk biomarker taxa in biodegradable plastispheres, particularly Aeromonas and Escherichia, which concurrently harbored antibiotic resistance, genetic mobility, and virulence determinants. Genetic-context analysis revealed contig-level co-localization of these determinants, indicating their potential genetic linkage. Within this structural framework, the co-occurrence of ARGs and MGEs indicated an increased potential for MGE-mediated horizontal gene transfer, whereas the enrichment of VFGs involved in environmental sensing, colonization, and nutrient acquisition suggested potential adaptation to resource competition, thereby potentially contributing to the co-selection of genetically linked ARGs. Substrate biodegradability amplifies both pathways by intensifying these spatial and competitive interactions, rendering plastispheres critical incubators for resistant pathogens in riverine ecosystems. Ultimately, this resistome expansion independent of antibiotic selective pressure reveals the potential ecological hazards of biodegradable plastics, substantiating the need for a systematic reassessment of their widespread use within the "One Health" framework.
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Determining Antimicrobial Resistance in the Plastisphere: Lower Risks of Nonbiodegradable vs Higher Risks of Biodegradable Microplastics
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This study found that biodegradable microplastics actually pose a higher risk for spreading antibiotic resistance than conventional non-biodegradable plastics. As biodegradable plastics break down, they appear to promote stress responses in bacteria that encourage the sharing of antibiotic resistance genes. This is concerning because biodegradable plastics are often marketed as safer alternatives.
DeterminingAntimicrobial Resistance in the Plastisphere:Lower Risks of Nonbiodegradable vs Higher Risks of Biodegradable Microplastics
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Researchers determined the prevalence and diversity of antimicrobial resistance genes in the plastisphere (biofilm on microplastics) compared to surrounding water and sediment, finding that non-biodegradable plastics hosted distinct resistance gene profiles with lower overall resistance risk than biodegradable plastic surfaces.
Selective enrichment of high-risk antibiotic resistance genes and priority pathogens in freshwater plastisphere: Unique role of biodegradable microplastics
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This study found that biodegradable microplastics like polylactic acid (PLA) -- often marketed as eco-friendly -- actually attracted more dangerous antibiotic-resistant bacteria than conventional plastics in freshwater. The biodegradable plastics selectively enriched high-priority pathogens carrying multiple resistance genes, meaning they could help spread antibiotic resistance through water systems that ultimately affect human health.
Biodegradable Microplastics Increase the Health Risks of Antibiotic Resistance Genes in Eutrophic Urban Lake
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Researchers conducted an in-situ experiment in an urban lake comparing how biodegradable and conventional plastics accumulate antibiotic resistance genes on their surfaces. They found that biodegradable polymers like PBS and PLA harbored significantly more resistance genes than conventional polystyrene, and that bacterial communities on all plastics differed markedly from those in the surrounding water. The study suggests that biodegradable microplastics may actually pose higher health risks by serving as hotspots for antibiotic resistance in polluted freshwater environments.
Biodegradable microplastics induced the dissemination of antibiotic resistance genes and virulence factors in soil: A metagenomic perspective
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Researchers found that biodegradable microplastics promoted the spread of antibiotic resistance genes and virulence factors in soil at levels comparable to conventional microplastics, challenging assumptions about their environmental safety.
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