# The relationship between social adversity, micro-RNA expression and post-traumatic stress in a prospective, community-based cohort

## TL;DR

This study explores how social adversity and traumatic stress are linked to micro-RNA expression, offering insights into biological mechanisms of resilience and vulnerability.

## Contribution

Identifies 86 miRNAs associated with social adversity and post-traumatic stress disorder symptoms in a community-based cohort.

## Key findings

- 86 miRNAs are associated with social adversities and post-traumatic stress symptoms.
- These miRNAs are primarily involved in immune response, brain function, and cell differentiation.
- 22 of the identified miRNAs have prior associations with PTSD-related conditions.

## Abstract

Epigenetics influence and are influenced by the impact of social and environmental challenges on biological outcomes. Therefore, pinpointing epigenetic factors associated with social adversity and traumatic stress enables understanding of the mechanisms underlying vulnerability and resilience. We hypothesized that micro-RNAs (miRNAs) expression may be associated with post-traumatic stress disorder symptom severity (i.e., PTSS) following exposure to social adversity. To test this hypothesis, we leveraged blood-derived RNA samples (n=632) and social adversity data from 483 unique participants in the Detroit Neighborhood Health Study, a community-based, prospective cohort of predominantly African Americans. Results identified 86 miRNAs that are associated with social adversities (financial difficulties, perceived discrimination, cumulative trauma) and PTSS. These miRNAs are primarily involved in the immune response, brain and neural function, as well as cell cycle and differentiation, and 22(25%) have previously been associated with conditions related to PTSD, including traumatic brain injury and stress response. Our findings offer a fresh perspective on understanding the epigenetic role of miRNA in the interaction between social adversity and traumatic stress.