High apolipoprotein E4 allele frequency in FXTAS patients

Area of Science:

• Neurogenetics
• Neurodegenerative Diseases
• Molecular Biology

Background:

• Fragile X-associated tremor/ataxia syndrome (FXTAS) is a late-onset neurodegenerative disorder affecting FMR1 premutation carriers.
• The apolipoprotein E (APOE) ε4 allele is a known risk factor for various neurodegenerative diseases.

Purpose of the Study:

• To investigate the association between APOE genotypes and allelic distribution in patients with FXTAS.
• To determine if APOE ε4 influences the risk of developing FXTAS.

Main Methods:

• Genotyping of APOE in 44 unrelated FMR1 premutation carriers.
• Comparison of APOE genotypes between 22 FXTAS patients and 22 asymptomatic carriers.

Main Results:

• A significantly higher proportion of FXTAS patients carried the APOE ε4 allele (ε4/4 and ε4/3 genotypes) compared to controls.
• The presence of the APOE ε4 allele was associated with an increased risk of developing FXTAS (odds ratio = 12.041; P = 0.034).

Conclusions:

• The findings suggest that the APOE ε4 allele may act as a genetic susceptibility factor for FXTAS.
• Individuals with the APOE ε4 allele may have a predisposition to developing this neurodegenerative condition.