Genetic and environmental covariation between autistic traits and behavioral problems

Area of Science:

• Psychiatry
• Behavioral Genetics
• Developmental Psychology

Background:

• Autistic traits are observed in the general population.
• Understanding the interplay between autistic traits and other behavioral problems is crucial.
• Investigating the genetic and environmental contributions to these overlaps is important.

Purpose of the Study:

• To examine the overlap between autistic traits and behavioral problems in a general population.
• To determine the extent to which this overlap is influenced by genetic or environmental factors.
• To explore the specific genetic underpinnings of autistic traits.

Main Methods:

• Utilized Youth Self Report (YSR) data from 424 twin pairs and nontwin siblings at 18 years of age.
• Collected self-report ratings on the Autism-spectrum Quotient (AQ) in 197 twin families.
• Employed stepwise backward regression and genetic structural equation modeling.

Main Results:

• Withdrawn Behavior (WB) and Social Problems (SOC) scales were significant predictors of AQ scores, explaining 23% of the variance with sex.
• The overlap between AQ, WB, and SOC scores was primarily attributed to shared genetic effects.
• Approximately half of the genetic variance in AQ scores was unique to AQ, while the other half was shared with WB and SOC.

Conclusions:

• Autistic traits in the general population are associated with social and withdrawn behavioral problems.
• These behavioral problems share a partial common genetic etiology with autistic traits.
• Autistic traits possess specific characteristics that are substantially genetically independent from social and withdrawn behaviors.