New Study Uncovers How Trauma Rewires the Brain at a Molecular Level
A new study is examining how trauma alters brain function at a molecular level. Researchers will focus on proteins called histones, which package DNA and undergo temporary changes during traumatic experiences. The project has received a five-year, $3.2 million grant from the U.S. National Institutes of Health. The team aims to uncover how trauma leaves lasting biological marks on the brain. Their work centres on the amygdala, the region responsible for fear responses. Using a mouse-model system, they will investigate how epigenetic modifications—chemical changes to DNA packaging—affect fear-memory genes.
The researchers believe trauma triggers precise epigenetic changes, keeping fear-related genes in a hyper-accessible, 'ready' state. This process may explain the exaggerated fear responses seen in Post-Traumatic Stress Disorder (PTSD). One key player is HDAC3, a histone modifier known to regulate memory formation during acute stress. To test their theory, the team will use CRISPR/Cas9 gene-editing tools. By manipulating top candidate genes, they hope to block or erase the heightened fear reactions linked to PTSD. Currently, no treatment reliably improves symptoms across all patient groups. PTSD affects around 7% of people in the U.S. at some point in their lives. Women are roughly twice as likely to develop the condition as men, though the biological reasons remain unclear.
The findings could lead to more targeted PTSD therapies. By pinpointing epigenetic changes in the amygdala, scientists may develop treatments that reduce exaggerated fear responses. The research also aims to address why women experience PTSD at higher rates than men.
