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APOE Genotypes Associate With Cognitive Performance but Not Cerebral Structure: Diabetes Heart Study MIND
Nicholette D Palmer Allred1,2, Laura M Raffield2,3, Joycelyn C Hardy4
1Department of Biochemistry, Wake Forest School of Medicine, Winston-Salem, NC nallred@wakehealth.edu.
Diabetes Care
|October 6, 2016
Summary
Genetic variations in apolipoprotein E (APOE) influence dementia risk in type 2 diabetes (T2D). APOE E4 and E2 variants were linked to poorer cognitive function, particularly memory and global cognition, in European and African Americans with T2D.
Area of Science:
- Neuroscience
- Genetics
- Endocrinology
Background:
- Dementia significantly impacts individuals with type 2 diabetes (T2D).
- Genetic factors, specifically variations in the apolipoprotein E (APOE) gene, are strongly implicated in dementia risk.
- Understanding the interplay between APOE, T2D, and cognitive decline is crucial for developing targeted interventions.
Purpose of the Study:
- To investigate the association between APOE genetic variations and cognitive performance in European Americans and African Americans with T2D.
- To examine the relationship between APOE genotypes and cerebral structural integrity using MRI in individuals with T2D.
- To compare and contrast the effects of different APOE haplotypes (E2, E3, E4) on cognitive domains and brain structure within the T2D population.
Main Methods:
- Analysis of cognitive performance data from European American (n=754) and African American (n=517) participants in the Diabetes Heart Study (DHS) MIND cohorts.
- Assessment of executive function, memory, and global cognition using a standardized cognitive battery.
- Brain magnetic resonance imaging (MRI) to evaluate cerebral structure in relation to APOE genotype.
Main Results:
- The APOE E4 risk haplotype was associated with diminished global cognition (MMSE) in both European and African Americans with T2D.
- Contrary to some existing literature, the APOE E2 haplotype, found at higher frequencies in this T2D cohort, correlated with poorer performance on the Rey Auditory Verbal Learning Test (memory).
- Exploratory analyses revealed nominal associations between APOE haplotype groups and MRI-derived measures of cerebral structure.
Conclusions:
- APOE E2 and E4 carriers demonstrated worse performance in memory and global cognition compared to APOE E3 carriers.
- Identifying specific genetic contributors like APOE is essential for elucidating novel pathways for dementia prevention and treatment in the context of type 2 diabetes.
- Further research is warranted to fully understand the complex genetic architecture underlying dementia in T2D.