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Plastic leachate exposure drives antibiotic resistance and virulence in marine bacterial communities
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This study found that chemicals leaching from plastic waste in seawater can promote antibiotic resistance and virulence in marine bacteria, even without direct contact with the plastic surface. Bacteria exposed to plastic leachate showed increased resistance to multiple antibiotics and enhanced ability to cause disease. The findings suggest that the chemical pollution from degrading plastics may pose broader risks to ocean ecosystems and potentially human health than previously recognized.
Plastic pollution is a serious global problem, with more than 12 million tonnes of plastic waste entering the oceans every year. Plastic debris can have considerable impacts on microbial community structure and functions in marine environments, and has been associated with an enrichment in pathogenic bacteria and antimicrobial resistance (AMR) genes. However, our understanding of these impacts is largely restricted to microbial assemblages on plastic surfaces. It is therefore unclear whether these effects are driven by the surface properties of plastics, providing an additional niche for certain microbes residing in biofilms, and/or chemicals leached from plastics, the effects of which could extend to surrounding planktonic bacteria. Here, we examine the effects of polyvinyl chloride (PVC) plastic leachate exposure on the relative abundance of genes associated with bacterial pathogenicity and AMR within a seawater microcosm community. We show that PVC leachate, in the absence of plastic surfaces, drives an enrichment in AMR and virulence genes. In particular, leachate exposure significantly enriches AMR genes that confer multidrug, aminoglycoside and peptide antibiotic resistance. Additionally, enrichment of genes involved in the extracellular secretion of virulence proteins was observed among pathogens of marine organisms. This study provides the first evidence that chemicals leached from plastic particles alone can enrich genes related to microbial pathogenesis within a bacterial community, expanding our knowledge of the environmental impacts of plastic pollution with potential consequences for human and ecosystem health.
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Plastic Leachate Exposure Drives Antibiotic Resistance and Virulence in Marine Bacterial Communities
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This study exposed marine bacterial communities to plastic leachate and found that leachate significantly increased antibiotic resistance genes and virulence factors in the microbiome, suggesting that chemical additives leaching from plastic debris in the ocean can drive the spread of antimicrobial resistance.
Structure and activity of marine bacterial communities responding to plastic leachates.
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Researchers investigated which marine bacterial communities respond to organic compounds leached from plastic debris in the ocean. They found that plastic leachates selectively enriched certain bacterial groups and altered community structure compared to seawater controls. The study suggests that plastic pollution not only introduces foreign materials but also chemically reshapes microbial communities in marine ecosystems.
Selective enrichment of bacteria and antibiotic resistance genes in microplastic biofilms and their potential hazards in coral reef ecosystems
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Researchers found that microplastic surfaces in coral reef waters selectively collect bacteria carrying antibiotic resistance genes, with the concentration of resistant bacteria linked to antibiotic levels in the surrounding water. The bacterial communities on microplastics were enriched for disease-related pathways compared to the surrounding seawater. This means microplastics in marine environments could serve as vehicles for spreading drug-resistant infections, posing risks to both coral ecosystems and human health.
Metagenomic characterization of bacterial communities on beach macroplastics: Insights into antimicrobial resistance and virulence
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Plastic trash on beaches isn't just an eyesore — it's also a floating home for bacteria, and this study found that these "plastic-dwelling" microbes carry more antibiotic-resistance genes and disease-causing traits than bacteria living on natural materials like driftwood or shells. This matters because as plastic pollution spreads through our oceans and coastlines, it may be helping harmful, drug-resistant bacteria hitch a ride and spread more easily into places where people swim, fish, and gather seafood.
Marine plastisphere selectively enriches microbial assemblages and antibiotic resistance genes during long-term cultivation periods
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Researchers placed four types of common microplastics in a marine environment for over 100 days and found that bacterial communities and antibiotic resistance genes accumulated on the plastic surfaces over time. PVC microplastics were particularly effective at concentrating resistance genes, and a key gene-transfer element was found on all plastic types. These results show that microplastics floating in the ocean act as hotspots for antibiotic-resistant bacteria, which could eventually reach humans through seafood or water.
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