Genetic and Environmental Risk Factors for Intermittent Explosive Disorder, ADHD and Conduct Disorder: Shared and...

Area of Science:

• Psychiatry
• Developmental Psychology
• Genetics

Background:

• Intermittent explosive disorder (IED), attention-deficit/hyperactivity disorder (ADHD), and conduct disorder (CD) are distinct but often comorbid conditions.
• Understanding shared and unique risk factors is crucial for effective diagnosis and treatment.
• Etiological pathways require comprehensive investigation to inform targeted interventions.

Purpose of the Study:

• To systematically review and synthesize evidence on shared and unique risk factors for IED, ADHD, and CD.
• To elucidate common etiological pathways underlying these disruptive behavior disorders.
• To inform the development of integrated intervention strategies based on identified risk factors.

Main Methods:

• A systematic literature search was conducted across seven major databases.
• Included studies focused on genetic, environmental, and psychosocial risk factors for IED, ADHD, and CD.
• Study selection and quality assessment followed PRISMA guidelines.

Main Results:

• Fifteen cross-disorder risk factors were identified across 44 studies.
• Nine risk factor domains demonstrated evidence across all three disorders (IED, ADHD, CD).
• Six risk factors (e.g., maternal substance use, perinatal risks, genetic variants, parenting stress) showed a more restricted pattern, with some not yet studied for IED.

Conclusions:

• Shared environmental and biological factors play a significant role across IED, ADHD, and CD.
• Findings support the development of integrated intervention approaches.
• Further research is needed, focusing on gender, developmental stages, and family dynamics, to address existing knowledge gaps.