Genetic and environmental influences on obsessive-compulsive behaviour across development: a longitudinal twin study

Area of Science:

• Developmental Psychology
• Behavioral Genetics
• Psychopathology

Background:

• Factors influencing the stability of obsessive-compulsive behavior (OCB) from childhood to adolescence are not well understood.
• Paediatric OCB stability and the roles of genetic and environmental influences across development require further investigation.

Purpose of the Study:

• To investigate the longitudinal stability of paediatric obsessive-compulsive behavior (OCB) over a 12-year period.
• To determine the extent to which genetic and environmental factors influence OCB stability.
• To examine whether these genetic and environmental influences are stable or dynamic throughout development.

Main Methods:

• Utilized a population-based twin study with 14,743 participants.
• Collected parental ratings of OCB severity at ages 4, 7, 9, and 16 years.

Main Results:

• Obsessive-compulsive behavior (OCB) demonstrated moderate stability across the observed developmental period.
• Genetic factors significantly influenced OCB persistence, explaining 59-80% of its stability over time.
• Evidence of genetic continuity, attenuation, and innovation was observed, indicating a dynamic genetic influence on OCB.

Conclusions:

• Obsessive-compulsive behavior (OCB) exhibits moderate developmental stability, largely driven by genetic factors.
• Genetic influences on OCB are not constant but represent a dynamic developmental process.
• Non-shared environmental factors had a lesser impact on OCB stability and were largely age-specific.