Đề thi VSTEP Reading C1 — Epigenetics and Inheritance

For decades, biologists operated under a fundamental assumption: that the DNA sequence inherited from one's parents rigidly determines biological destiny. However, the emerging field of epigenetics has fundamentally challenged this paradigm. Epigenetics refers to chemical modifications, such as methylation, that alter gene expression without changing the underlying DNA sequence. These modifications can switch genes on or off, thereby influencing an organism's traits and disease susceptibility. The implications of epigenetic research are profound. Studies have demonstrated that environmental factors—including diet, stress, and exposure to toxins—can induce epigenetic changes that may persist across generations. For instance, research on mice has shown that parental obesity can predispose offspring to metabolic disorders through epigenetic mechanisms, independent of inherited genetic mutations. Nevertheless, the translation of epigenetic findings into clinical practice remains contentious. While pharmaceutical companies are investing heavily in epigenetically-targeted therapies, critics caution that the complexity of gene regulation renders simple interventions ineffective. Moreover, ethical concerns regarding the heritability of environmentally-induced changes complicate policy decisions.