Internalizing and Externalizing Traits During Adolescence: Using Epigenetics and Perinatal Risks to Differentiate...

Area of Science:

• Developmental Psychology
• Molecular Psychiatry
• Behavioral Genetics

Background:

• Adolescence is a critical period for the onset of internalizing and externalizing behavioral problems.
• Understanding distinct psychopathological profiles and their underlying biological mechanisms is crucial for targeted interventions.
• Environmental factors and epigenetic modifications are increasingly recognized as significant contributors to psychopathology.

Purpose of the Study:

• To identify distinct clusters of internalizing and externalizing traits in adolescents.
• To examine associations between identified clusters and environmental risk factors.
• To investigate differences in epigenetic profiles, specifically DNA methylation, across clusters.

Main Methods:

• Cross-sectional study of 205 adolescents referred for childhood psychopathology.
• Behavioral problems assessed using the Child Behavior Checklist/6-18 (CBCL).
• Finite mixture modeling used for cluster analysis; χ2-tests and Bonferroni-corrected t-tests for group comparisons.

Main Results:

• Two adolescent psychopathology clusters identified: LOW (subclinical symptoms) and HIGH (high internalizing/externalizing symptoms).
• The HIGH cluster exhibited significantly more perinatal complications.
• The HIGH cluster showed altered methylation in CpG sites of Brain-derived neurotrophic factor (BDNF), Insulin-like growth factor-2 (IGF2), and Oxytocin receptor (OXTR), but not FK506-binding protein 5 (FKBP5).

Conclusions:

• A strong association exists between early adverse events, DNA methylation patterns, and adolescent psychopathology.
• Specific epigenetic modifications in genes like BDNF, IGF2, and OXTR may mediate the link between early adversity and behavioral problems.
• These findings highlight the interplay of environmental and epigenetic factors in the development of adolescent behavioral issues.