[Genetic findings in obsessive-compulsive disorder in childhood and adolescence and in adulthood]

Area of Science:

• Psychiatry and Genetics
• Child and Adolescent Mental Health

Context:

• Obsessive-compulsive disorder (OCD) affects 1-2% of children, causing significant developmental impairment.
• OCD is characterized by intrusive thoughts and repetitive behaviors that patients struggle to suppress.
• Early-onset OCD has a familial component, suggesting a strong genetic influence.

Purpose:

• To review the current state of genetic research on obsessive-compulsive disorder (OCD), with a focus on early-onset forms.
• To discuss the complex interplay of genetic and environmental factors in OCD etiology.
• To highlight the challenges posed by phenotypic and genetic heterogeneity in identifying specific genetic contributors.

Summary:

• OCD is familial, with both genetic and environmental factors significantly contributing to its development.
• Genetic research, including linkage and association studies, has yielded conflicting results.
• The disorder likely results from multiple genes of modest effect interacting with environmental influences.
• Phenotypic and genetic heterogeneity complicates the identification of specific genetic factors.

Impact:

• Understanding the genetic underpinnings of OCD is crucial for developing targeted treatments.
• Recognizing the role of environmental factors emphasizes the need for comprehensive intervention strategies.
• Future research should consider OCD subtypes (e.g., age at onset, symptom dimensions) for more precise genetic analysis.