The article reports on a study by researchers at Washington University School of Medicine in St. Louis and Princeton University, published in Neuron, which identifies a biological mechanism linking early-life stress to long-term vulnerability to mental illness. The study found that severe stress during childhood can alter gene activity in the brain by changing the way DNA is packaged within brain cells, specifically in dopamine-producing neurons of the ventral tegmental area. This alteration makes certain stress-related genes more easily activated, potentially rendering the brain more reactive and less resilient to future stressors.
The researchers discovered that early stress elevates levels of the enzyme SETD7 in these neurons, which adds a chemical marker (H3K4me1) that promotes a more open DNA structure, enhancing gene accessibility. Experiments demonstrated that artificially increasing SETD7 in young, unstressed mice led to a more open DNA configuration and heightened stress sensitivity in adulthood. Conversely, inhibiting SETD7’s activity after early-life stress prevented the development of increased stress sensitivity, suggesting that SETD7-mediated DNA packaging changes may create a lasting molecular memory of early adversity. The findings provide a specific biological target for future interventions aimed at mitigating the effects of childhood trauma. Source