How trauma-induced epigenetic changes mediate the link between early-life adversity and the development of anxiety, and their implications for treatment

Demethylation, hypodopaminergia, and treatment: biological brakes and social policy changes

Abstract

This paper examines how early-life exposure to severely unsafe environments, including war, chronic violence, and instability, shapes the developing brain through the interaction of environmental stress, genetic susceptibility, and epigenetic regulation. It focuses on fear and anxiety as outcomes of altered neural circuitry, especially within the amygdala, hippocampus, prefrontal cortex, and stress-related neurotransmitter systems such as glutamate, norepinephrine, and dopamine. The paper argues that toxic stress during periods of high neuroplasticity can modify the expression of genes involved in the HPA axis, including FKBP5, leading to long-term changes in emotion processing and stress regulation. These changes may increase the risk of anxiety and trauma-related psychopathology in adolescence and adulthood. At the same time, the paper highlights the potential of safe, enriched, and trauma-informed environments, together with therapeutic interventions, to support fear extinction, restore healthier neurobiological functioning, and promote resilience.