Exposure to Violence Accelerates Epigenetic Aging in Children

Area of Science:

• Epigenetics
• Developmental Biology
• Environmental Health

Background:

• Epigenetic processes, like DNA methylation, are reliable indicators of biological age.
• DNA methylation patterns form an 'epigenetic clock' that can predict chronological age and identify age acceleration.
• Age acceleration, where epigenetic age outpaces chronological age, is linked to increased mortality risk.

Purpose of the Study:

• To investigate epigenetic age acceleration in children (ages 6-13) exposed to neighborhood violence.
• To examine the association between direct violence exposure, heart rate during stress, and epigenetic aging in children.
• To determine if DNA methylation in saliva can serve as a biomarker for the impact of violence on children's biological aging.

Main Methods:

• Saliva samples were collected from 101 children aged 6-13.
• Epigenetic age acceleration was assessed using DNA methylation patterns.
• Children's exposure to neighborhood violence and heart rate during a stressful task were measured.

Main Results:

• Epigenetic age acceleration was significantly associated with direct experience of violence (p=0.004).
• Age acceleration correlated with decreased heart rate during a stressful task (p=0.002).
• Children with accelerated epigenetic aging reported twice the violence exposure and exhibited adult-like heart rates.

Conclusions:

• Direct violence exposure in childhood is linked to accelerated epigenetic aging.
• DNA methylation in children's saliva may reflect the biological impact of early-life adversity.
• These findings suggest DNA methylation is a potential biological mechanism linking childhood violence to long-term health outcomes.