Apolipoprotein E and herpes virus diseases: herpes simplex keratitis

Area of Science:

• Virology
• Neuroscience
• Genetics

Background:

• Herpes simplex virus type 1 (HSV1) is prevalent in the brain of elderly individuals and Alzheimer's disease (AD) patients.
• The combination of HSV1 in the brain and the apolipoprotein E (apoE)-epsilon 4 allele is a significant risk factor for AD.
• ApoE-epsilon 4 is also a known risk factor for herpes labialis.

Purpose of the Study:

• To investigate the potential involvement of apolipoprotein E (apoE) alleles in herpes simplex keratitis (HSK), another disorder caused by HSV1.
• To determine if specific apoE genotypes are associated with an increased risk or susceptibility to HSK.

Main Methods:

• Genotyping of apolipoprotein E (apoE) alleles in patients diagnosed with herpes simplex keratitis (HSK).
• Comparison of apoE allele frequencies in HSK patients with those in a control group of unaffected individuals.
• Statistical analysis to assess the significance of observed differences in allele frequencies.

Main Results:

• The frequency of the apoE-epsilon 4 allele in 46 HSK patients was 15%, which was identical to the frequency observed in 238 unaffected controls.
• The apoE-epsilon 2 allele frequency was 13% in HSK patients, compared to 7% in controls, but this difference was not statistically significant.
• No statistically significant association was found between apoE genotypes and the occurrence of herpes simplex keratitis.

Conclusions:

• The findings suggest that apolipoprotein E (apoE) alleles, specifically epsilon 4 and epsilon 2, are not significantly associated with herpes simplex keratitis (HSK).
• Unlike its role in Alzheimer's disease and herpes labialis, apoE genotype does not appear to be a major risk factor for HSV1-induced HSK.
• Further research may be needed to explore other genetic or environmental factors influencing HSK susceptibility.