Meta-analyses of developing brain function in high-risk and emerged bipolar disorder

Area of Science:

• Neuroimaging
• Psychiatry
• Developmental Neuroscience

Background:

• Pediatric bipolar disorder (PBD) poses diagnostic challenges, especially with subsyndromal symptoms.
• Identifying early brain function markers in high-risk (HR) individuals is crucial for timely intervention.
• Previous studies on genetically HR offspring have had limited success in establishing reliable biomarkers.

Purpose of the Study:

• To identify early neurobiological markers of brain function in individuals at high risk for PBD.
• To differentiate brain activity patterns between HR youth, PBD patients, and typically developing controls.
• To inform the development of potential screening measures for PBD.

Main Methods:

• An activation likelihood estimation (ALE) meta-analysis was conducted on fMRI studies.
• Included data from 29 reports encompassing pediatric bipolar disorder (PBD), high-risk (HR), and typically developing (TD) groups.
• Analyzed mixed cognitive and emotional task-based brain activity.

Main Results:

• HR individuals showed significantly greater activation in right DLPFC-insular-parietal-cerebellar regions compared to TD.
• HR group also exhibited increased activity in the right DLPFC, insula, and left cerebellum versus PBD patients.
• PBD patients displayed greater activation in the right amygdala, parahippocampal gyrus, medial PFC, and left ventral striatum, but lower activation in right VLPFC and DLPFC compared to TD.

Conclusions:

• HR youth demonstrate increased brain activation in cognition and emotion-processing regions, suggesting compensatory mechanisms.
• PBD patients show decreased activity in prefrontal cortex (PFC) regions and subcortical abnormalities, indicative of a more established disease.
• These distinct patterns highlight potential neurobiological differences and aid in understanding disease progression.