Children's genotypes interact with maternal responsive care in predicting children's competence: diathesis-stress or...

Area of Science:

• Developmental Psychology
• Behavioral Genetics

Background:

• Genotype × Environment (G × E) interactions are crucial for understanding individual differences in development.
• The serotonin transporter linked promoter region (5-HTTLPR) gene is frequently studied for its role in emotional and behavioral outcomes.
• Maternal responsive care is a key environmental factor influencing child development.

Purpose of the Study:

• To investigate G × E interactions between the 5-HTTLPR gene and maternal responsive care.
• To examine the impact of these interactions on children's academic, social, and moral competence.
• To differentiate between diathesis-stress and differential susceptibility models in explaining G × E effects.

Main Methods:

• Longitudinal assessment of maternal responsive care from 15 to 52 months.
• Genotyping for the 5-HTTLPR gene in children.
• Assessment of children's academic, social, and moral competence at 67 months using parent reports and narrative observations.

Main Results:

• Robust G × E interactions were found, with children's 5-HTTLPR genotype moderating the effects of maternal care.
• Children with at least one short 5-HTTLPR allele (ss/sl) showed better outcomes with more responsive mothers, while long allele (ll) children were unaffected.
• Academic and social competence followed a diathesis-stress model, whereas moral internalization followed a differential susceptibility model.

Conclusions:

• Maternal responsive care differentially impacts children's competence based on their 5-HTTLPR genotype.
• The 5-HTTLPR genotype influences susceptibility to environmental influences, with distinct patterns for academic/social versus moral development.
• Findings highlight the importance of considering genetic predispositions in understanding the effects of early caregiving environments.