Gray Matter Volume Correlates of Co-Occurring Depression in Autism Spectrum Disorder

Area of Science:

• Neuroscience
• Psychiatry
• Developmental Psychology

Background:

• Autism Spectrum Disorder (ASD) is a neurodevelopmental condition impacting social communication and behavior.
• Co-occurring depression is common in adults with ASD but often undiagnosed due to communication challenges and assessment limitations.
• Limited research exists on the neural underpinnings of depression in adults with ASD.

Purpose of the Study:

• To investigate the relationship between regional grey matter volume (rGMV) and co-occurring depression severity in adults with ASD.
• To identify potential neuroimaging-based biomarkers for depression in adults with ASD.
• To explore differences in rGMV between adults with ASD and typically developed individuals.

Main Methods:

• Utilized structural MRI and phenotypic data from the Autism Brain Imaging Data Exchange (ABIDE II) repository.
• Analyzed adults with ASD (n=44) and matched typically developed (TD) controls (n=39).
• Examined correlations between rGMV and depression/ASD severity, and performed exploratory group comparisons.

Main Results:

• Depression severity negatively correlated with the rGMV of the right thalamus in adults with ASD.
• A significant interaction between depression severity and ASD symptoms was found in the left cerebellum crus II.
• Exploratory analysis revealed differences in rGMV between ASD and TD groups.

Conclusions:

• Findings suggest specific brain regions (right thalamus, left cerebellum crus II) are implicated in co-occurring depression in adults with ASD.
• The study contributes to understanding the neurobiological basis of depression in this population.
• Identified potential neuroimaging markers that could aid in timely diagnosis and management of depression in adults with ASD.