Association Between Elevated Depressive Symptoms and Cognitive Function Moderated by APOE4 Status: Framingham...

Area of Science:

• Neuroscience
• Genetics
• Psychiatry

Background:

• Depression and Apolipoprotein E4 (APOE4) are linked to cognitive decline and brain structure changes.
• APOE4 is a significant genetic risk factor for Alzheimer's disease.

Purpose of the Study:

• To determine if APOE4 status influences the relationship between depressive symptoms and cognitive function.
• To investigate the impact of APOE4 on the association between depression, cognition, and brain structure.

Main Methods:

• 1,968 stroke- and dementia-free participants underwent cognitive tests, brain MRI, and depression screening.
• Linear and logistic regression analyses were used to examine associations.
• Interaction terms assessed effect modification by APOE4 status.

Main Results:

• Elevated depressive symptoms correlated with lower cognitive performance across multiple domains.
• APOE4-positive individuals with depressive symptoms showed poorer visual short- and long-term memory.
• No significant association was found between depressive symptoms and brain structure in the overall sample.

Conclusions:

• Depressive symptoms affect cognition in non-demented individuals.
• The APOE4 allele may amplify the negative impact of depression on visual memory.
• Screening for depressive symptoms is recommended to prevent misdiagnosis of neurodegeneration, especially in APOE4 carriers.