EXPLORING THE EFFECT OF ENVIRONMENTAL TOXINS ON GENE EXPRESSION IN MAMMALIAN CELLS

Abstract

Environmental toxins, including heavy metals, pesticides, and industrial pollutants, have emerged as critical threats to human health due to their ability to induce molecular disturbances within biological systems. These toxicants disrupt normal gene regulatory mechanisms, potentially leading to carcinogenesis, neurodegeneration, reproductive dysfunction, and other chronic diseases. Understanding how these compounds influence gene expression in mammalian cells is essential for elucidating their pathological effects and guiding public health interventions. This study investigates the impact of various environmental toxins on gene expression dynamics by employing high-throughput RNA sequencing and quantitative PCR techniques. The experimental approach included exposing mammalian cell lines to cadmium, arsenic, lead, and pesticide mixtures, followed by transcriptomic profiling and epigenetic analysis. Data were evaluated using fold change calculations, pathway enrichment, and miRNA expression modulation, offering a comprehensive assessment of transcriptional and post-transcriptional alterations. Results revealed substantial gene expression changes in response to toxin exposure, particularly the upregulation of stress-related genes and downregulation of DNA repair pathways. The study also identified significant epigenetic modifications, such as altered DNA methylation patterns and shifts in histone acetylation, as well as deregulation of miRNA profiles. These molecular disruptions were shown to be dose-dependent and tissue-specific, indicating complex regulatory responses that extend beyond acute toxicity.The findings demonstrate that environmental toxins exert both immediate and persistent effects on gene expression, thereby increasing disease susceptibility over time. This research highlights the utility of gene expression profiling as a biomarker for toxic exposure and supports the development of predictive and preventive models for toxin-induced diseases. By elucidating the molecular mechanisms underlying these effects, the study contributes to more informed environmental health policies and targeted therapeutic strategies.