Orbitofrontal dysfunction in patients with obsessive-compulsive disorder and their unaffected relatives

Area of Science:

• Neuroscience
• Psychiatry
• Genetics

Background:

• Obsessive-compulsive disorder (OCD) involves repetitive behaviors linked to frontostriatal circuit dysfunction.
• The orbitofrontal cortex is crucial for behavioral flexibility, particularly in reversal learning.

Purpose of the Study:

• To investigate neural underpinnings of OCD by examining reversal learning in patients and relatives.
• To identify potential endophenotypes for OCD.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used to measure brain activity during a reversal learning task.
• Participants included individuals with OCD and their unaffected close relatives.

Main Results:

• OCD patients and their relatives exhibited reduced activation in the lateral orbitofrontal cortex and other cortical regions during reversal learning.
• These findings suggest a shared neural characteristic potentially predating the disorder.

Conclusions:

• Reduced cortical activation during reversal learning may represent a heritable endophenotype for OCD.
• This discovery offers a potential biomarker for OCD, aiding in understanding its genetic basis and neurobiological mechanisms.