Twins and virtual twins: Do genetic (as well as experiential) factors affect developmental risks?

Area of Science:

• Developmental Psychology
• Behavioral Genetics
• Adoption Studies

Background:

• Developmental delays and psychosocial risks are critical concerns for international adoption communities.
• Previous research has examined pre-adoption adversity and adjustment in adopted children, particularly those from China.
• Understanding the interplay of genetic and environmental factors is crucial for adopted children's well-being.

Purpose of the Study:

• To replicate earlier analyses of pre-adoption adversity and adjustment in adopted preschool-age Chinese girls.
• To conduct genetic analyses on key areas of adjustment derived from the Pre-Adoption Adversity (PAA) Questionnaire.
• To investigate the influence of family factors and age at adoption on behavioral outcomes in adopted children.

Main Methods:

• Administered the Pre-Adoption Adversity (PAA) Questionnaire to parents of adopted Chinese twins and unrelated adopted siblings.
• Conducted genetic analyses on four content areas: Developmental Delays at Adoption, Initial Adaptation to Adoption, Crying/Clinging, and Refusal/Avoidance.
• Examined the predictive value of age at adoption and family factors on adoptees' behavioral outcomes.

Main Results:

• Age at adoption was a less significant predictor of externalizing and internalizing behaviors compared to other factors.
• Family factors, such as parental education, significantly influenced behavioral outcomes in adopted Chinese twins.
• Genetic effects were identified across all four PAA Questionnaire content areas, with shared environmental effects noted for developmental delays and crying/clinging.

Conclusions:

• Family environment and genetic predispositions play significant roles in the developmental trajectories of adopted children.
• Genetically sensitive research designs are recommended for future investigations into developmental and psychosocial adjustment in adoption.
• Findings underscore the complex interplay of nature and nurture in shaping the behavior of adopted children.