Developmental twin study of attention problems: high heritabilities throughout development

Area of Science:

• Behavioral Genetics
• Developmental Psychology
• Psychopathology

Background:

• Longitudinal studies on the genetic and environmental links between childhood and adult attention-deficit/hyperactivity disorder (ADHD) are scarce.
• Understanding the developmental trajectory of attention problems requires cross-informant data.

Purpose of the Study:

• To investigate the relative contributions of genetic and environmental factors to attention problems from childhood through early adulthood.
• To examine the stability and emergence of genetic influences on attention problems over time.

Main Methods:

• Utilized longitudinal structural equation modeling with multiple informants.
• Analyzed data from the Swedish Twin Study of Child and Adolescent Development.
• Included 1,480 twin pairs prospectively followed from childhood to young adulthood, with parent and self-ratings of attention problems at multiple ages.

Main Results:

• High heritability (h² = 0.77-0.82) for attention problems was observed across childhood and early adulthood.
• Early genetic effects on attention problems persisted, explaining significant variance in adolescence and young adulthood.
• New genetic risk factors for attention problems emerged during adolescence and early adulthood.

Conclusions:

• Shared attention problems, rated by self and others, are highly heritable throughout development.
• Low heritability reported for adult ADHD may be due to rater effects.
• Attention problems represent a complex phenotype with both genetic continuity and innovation across the lifespan.