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Transcriptomic responses in Daphnia magna exposed to PLA, PBAT, and PET microplastics: Insights into different molecular toxicity pathways.
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Scientists exposed tiny water creatures called Daphnia (a key part of the freshwater food chain) to three common types of microplastics, including materials marketed as "biodegradable" alternatives like PLA and PBAT. They found that each plastic type triggered its own unique pattern of stress at the genetic level—affecting things like energy use, oxygen processing, and immune defenses—showing that not all microplastics harm organisms in the same way. This matters because it suggests that switching to "eco-friendly" plastics doesn't necessarily mean switching to harmless ones, and understanding these different biological effects could help us better assess
Microplastics are increasingly recognized as persistent pollution in freshwater ecosystems, yet their early molecular mechanism on aquatic invertebrates remains poorly characterized. In this study, we investigated the acute transcriptomic response of Daphnia magna following a 70-hour exposure to three microplastic types: polylactic acid (PLA), polybutylene adipate terephthalate (PBAT), and polyethylene terephthalate (PET). Despite relatively modest numbers of differentially expressed genes, clear polymer-dependent and shared responses emerged. All three microplastics elicited a common core signature involving modulation of lipid transport, extracellular structural components, and amino acid metabolic processes, suggesting modulation of pathways linked to metabolic functions. Polymer-specific responses were also evident. Polylactic acid and PBAT jointly affected tetrapyrrole and heme biosynthetic processes, indicating potential influence on oxygen-related metabolism, while PBAT and PET shared suppression of cuticle-associated genes, consistent with modulation of structural maintenance pathways. Polylactic acid additionally affected circadian and oxidative stress-related processes, whereas PET modulated immune-related signalling, including toll-like receptor pathways. These findings demonstrate that polymer type influences distinct biological processes in D. magna, highlighting the importance of polymer chemistry in shaping organismal responses to microplastic exposure. This study also accentuates the value of transcriptomic profiling for identifying pathway-level responses that may not be captured by conventional endpoints.
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Different chronic effects of conventional PET and biodegradable PLA microplastics: Insights from apical and transcriptomic responses in Daphnia magna
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"Biodegradable" plastics are often marketed as the safer, eco-friendly choice, but this study found that when tiny water fleas were exposed to biodegradable plastic particles versus conventional plastic particles, both caused similar visible harm (stunted growth) — yet biodegradable plastic actually triggered more internal stress at the cellular level, including signs of oxidative damage. This matters because it shows that judging a plastic's safety just by outward effects can be misleading, and "biodegradable" doesn't automatically mean gentler on living cells — a reminder to look deeper before assuming these alternatives are truly better
Adverse effects of biodegradable mulch-film microplastics on Daphnia magna: Integrating energy budget, amino-acid profiling, and gene expression
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Researchers exposed Daphnia magna to four biodegradable mulch-film microplastic types for 16 days and found that PLA caused the most harm — reducing survival and skewing energy toward protein use — while PBAT and additive-free films caused minimal disruption, revealing that ecological risk depends on polymer chemistry rather than biodegradability alone.
Contrasting effects of conventional PET and biodegradable PHB microplastics on population dynamics and gut microbiome responses in Daphnia magna.
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Scientists found that traditional plastic particles (PET, found in bottles and packaging) harmed water flea populations and triggered stress responses, while "biodegradable" plastic particles (PHB) didn't reduce populations and instead seemed to be broken down by gut bacteria. This matters because it suggests not all plastics pollute equally, switching to certain biodegradable plastics could genuinely reduce harm to aquatic ecosystems, though more research is needed before we know what this means for human exposure to microplastics in our food and water.
Same but different: The response to petroleum and biodegradable bio-based microplastics deviates between Daphnia magna clones
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Scientists tested how tiny plastic particles affect water fleas, which are important indicators of water quality that humans depend on. They found that "eco-friendly" biodegradable plastics were just as harmful to these creatures as regular petroleum-based plastics, causing increased death rates and health problems. This matters because it suggests that switching to biodegradable plastics may not solve the microplastic pollution problem threatening our water ecosystems and potentially human health.
Biochemical and behavioral effects induced by conventional and bio-degradable plastics towards the cladoceran Daphnia magna
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Researchers exposed Daphnia magna to PET and PLA microplastics at three concentrations over 21 days, assessing biochemical endpoints including oxidative stress markers, antioxidant enzymes, lipid peroxidation, energy reserves, and swimming behavior. Both fossil-based PET and biobased PLA microplastics induced measurable stress responses at sub-individual and individual levels, demonstrating that bioplastics do not necessarily present a safer environmental profile than conventional polymers.
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