The Influence of Epigenetics on Gene Expression: Mechanisms, Environmental Interactions and Clinical Applications in Disease Prevention and Treatment

Epigenetics, as defined, is a crucial field of heritable modifications in gene activity or function independent of genetic DNA code variability. Determining this knowledge is very important. The review will elaborate on the principal epigenetic mechanisms comprising DNA methylation, histone modifications, and non-coding RNAs. Each bears responsibilities for being a major contributor to specifying gene expression as well as guardians for maintaining genomic stability. It also covers the impact of environmental factors, including nutrition, psychosocial stress, and toxic exposure, on changing epigenetic states often associated with shifts in disease susceptibility. By focusing on paradigmatic examples like the Dutch Hunger Winter study and research on chronic stress, this review illustrates that epigenetic changes can last many generations, hence affecting health even when the exposures occur far from the temporal context of an individual.