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Epigenetic and Gene Expression Responses in Daphnia magna to Polyethylene and Polystyrene Microplastics
Summary
Researchers exposed water fleas (Daphnia magna) to polyethylene and polystyrene microplastics and examined changes at the genetic and molecular level. They found that the microplastics altered DNA methylation patterns and disrupted the expression of genes involved in reproduction and stress response. The study provides evidence that microplastic exposure can cause changes beyond physical harm, affecting organisms at the epigenetic level.
Microplastics (MPs), ubiquitous environmental pollutants, pose substantial threats to aquatic ecosystems and organisms, including the model species Daphnia magna. This study examined the effects of polyethylene (PE) and polystyrene (PS) MPs on D. magna, focusing on ingestion, epigenetic alterations, and transcriptional responses. Exposure experiments revealed a concentration-dependent accumulation of MPs, with PS particles showing higher ingestion rates due to their higher density and propensity for aggregation. Epigenetic analyses demonstrated that exposure to PE MPs significantly reduced global DNA methylation (5-mC), suggesting hypomethylation as a potential stress response. Conversely, DNA hydroxymethylation (5-hmC) displayed variability under PS exposure. Transcriptional analysis identified a marked downregulation of Vitellogenin 1 (v1) and upregulation of Ecdysone Receptor B (ecr-b), highlighting stress-related and adaptive molecular responses. These findings enhance our understanding of the molecular and epigenetic effects of MPs on aquatic organisms, offering critical insights for developing effective environmental management and conservation strategies in the face of escalating MP pollution.