Genome-wide DNA methylation analysis of aggressive behaviour: a longitudinal population-based study

Area of Science:

• Behavioral epigenetics
• Neuroscience of aggression
• Human genetics

Background:

• Human aggression arises from genetic and experiential factors.
• Epigenetic mechanisms, such as DNA methylation (DNAm), mediate gene expression influencing neuronal function and behavior.
• Understanding the molecular underpinnings of aggression is crucial for addressing behavioral issues.

Purpose of the Study:

• To investigate the association between genome-wide DNA methylation (DNAm) and aggressive behavior.
• To explore the pleiotropic effects of genetic variants related to aggression.
• To determine if DNAm signatures of aggression are stable from adolescence to young adulthood.

Main Methods:

• Genome-wide DNA methylation levels were measured in peripheral blood from 95 individuals at ages 15 and 25.
• Aggressive behavior was assessed using the Life History of Aggression (LHA) scale at age 25.
• Statistical analyses identified differentially methylated positions (DMPs) and regions (DMRs) associated with LHA scores.

Main Results:

• One DMP (cg17815886) and five DMRs were significantly associated with LHA scores.
• The DMP was linked to the PDLIM5 gene, and DMRs were near genes TRIM10, GTF2H4, SLC45A4, B3GALT4, and LINC02068.
• Genetic variants near DMPs showed overlap with genes influencing cognitive function, educational attainment, and cholesterol levels.
• A subset of aggression-associated DMPs at age 25 were also identified at age 15, demonstrating predictive accuracy.

Conclusions:

• DNA methylation plays a significant role in the development of aggressive behaviors.
• Pleiotropic genetic variants associated with DMPs link aggression to other traits.
• Consistent DNA methylation patterns from adolescence to young adulthood may predict future aggression.