Preschool children without 7-repeat DRD4 gene more likely to develop disorganized attachment style

Area of Science:

• Neuroscience
• Genetics
• Developmental Psychology

Background:

• Low birth weight is linked to increased risk for neurological and behavioral issues.
• The dopamine D4 receptor (DRD4) gene influences cognitive and emotional processes.
• Disorganized attachment is a potential endophenotype of depression.

Purpose of the Study:

• To investigate the influence of birth weight and the DRD4 gene's 7-repeat allele on disorganized attachment.
• To examine the main effects of these factors on attachment development.

Main Methods:

• Utilized data from the Maternal Adversity, Vulnerability and Neurodevelopment (MAVAN) project.
• Analyzed data from 251 mother-child dyads with complete information.
• Assessed infant attachment style using a modified separation-reunion procedure.

Main Results:

• No significant main effect of birth weight on disorganized attachment was found (p = 0.998).
• A significant main effect of the DRD4 7-repeat polymorphism on disorganized attachment was observed (p = 0.004).

Conclusions:

• Children possessing the DRD4 7-repeat allele showed less likelihood of disorganized attachment.
• The DRD4 7-repeat allele may function as a protective factor against the development of disorganized attachment.
• Study limitations include a relatively small sample size and incomplete data for some subjects.