Dopamine D4 receptor polymorphism and sex interact to predict children's affective knowledge

Area of Science:

• Neuroscience
• Developmental Psychology
• Behavioral Genetics

Background:

• Affective knowledge, crucial for social interaction, is linked to empathy and theory of mind (ToM).
• While empathy and ToM are heritable, the genetic underpinnings of affective knowledge variability remain unclear.
• The dopamine D4 receptor gene's 7-repeat (7R) allele (DRD4-III) is associated with social behavior differences.

Purpose of the Study:

• To investigate the interaction between the DRD4-III polymorphism and sex on affective knowledge in children.
• To replicate and extend previous findings on cognitive empathy in adults to affective knowledge in younger age groups.

Main Methods:

• A study involving 563 children (ages 3.5 and 5 years) from the Longitudinal Israel Study of Twins.
• Affective knowledge was assessed using responses to an illustrated story depicting emotional situations.
• Genotyping for the DRD4-III polymorphism was performed.

Main Results:

• A significant interaction between sex and the DRD4-III 7R allele was found in both age groups.
• Boys carrying the 7R allele exhibited higher affective knowledge scores compared to girls.
• In the absence of the 7R allele, no significant sex difference in affective knowledge was observed.

Conclusions:

• The DRD4-III polymorphism and sex interact to influence affective knowledge development in children.
• These findings highlight the genetic and sex-specific contributions to socio-cognitive abilities.
• The results provide insights into the neurogenetic basis of social development and emotional understanding.