Epigenetics: The Impact of Trauma on Gene Expression and Transgenerational Transmission

This study examines the relationship between childhood trauma and epigenetic changes in genes that regulate the stress response. Traumas such as violence or lack of control experienced at an early age can disrupt the long-term regulatory mechanisms of the hypothalamic-pituitary-adrenal (HPA) axis, leading to impaired stress responses. Epigenetic mechanisms such as DNA methylation, histone modifications, and non-coding RNAs play an important role in the stress response by regulating gene expression without altering the DNA sequence. Genes such as FKBP5, MAOA, and NR3C1, which are important in stress regulation, are sensitive to childhood trauma; changes in their methylation and transcription levels affect neuronal function, synaptic plasticity, and emotional regulation. These modifications have been associated with increased psychiatric risks such as depression, post-traumatic stress disorder (PTSD), and antisocial behaviors. In addition, the intergenerational transmission of trauma is also considered; epigenetic changes that occur at an early age can be passed down through generations, increasing children's susceptibility to stress. The tissue specificity of epigenetic changes and the interaction between genetic and environmental factors are also important factors. Understanding these mechanisms provides a foundation for understanding the biological memory of childhood trauma and its impact on long-term health outcomes. At the same time, it suggests potential targets for early interventions and therapeutic strategies and provides guidance in understanding the psychological and physiological effects of trauma.