The APOE epsilon 4 polymorphism does not predict late onset depression: the Three-City Study

Area of Science:

• Neuroscience
• Genetics
• Psychiatry

Background:

• The apolipoprotein E ε4 allele (APOE4) is a known risk factor for dementia.
• Previous research on APOE4's association with late-onset depression (LOD) has yielded conflicting results.
• The independent risk of APOE4 for LOD, separate from dementia, requires further investigation.

Purpose of the Study:

• To investigate whether the APOE4 genotype increases the risk for incident major late-onset depression (LOD).
• To determine if this association persists independently of dementia status.

Main Methods:

• Genotyping for the APOE4 allele was performed on 2242 individuals.
• Incident major LOD was assessed in the study cohort.
• Statistical analyses were conducted to evaluate the association between APOE4 and LOD, with and without considering dementia.

Main Results:

• Major LOD was significantly associated with female sex (OR, 3.61; 95% CI, 1.89-6.90).
• The APOE4 genotype was not associated with major LOD in the overall cohort.
• This lack of association remained consistent even when individuals with dementia were excluded from the analysis.

Conclusions:

• The APOE4 genotype does not appear to be a predictive factor for developing major late-onset depression.
• APOE4 status has no significant impact on the risk of major LOD, irrespective of dementia presence.
• Further research may explore other genetic or environmental factors influencing LOD risk.