Apolipoprotein E polymorphism and heterozygous familial hypercholesterolemia. Sex-specific effects

Area of Science:

• Genetics
• Biochemistry
• Cardiovascular Disease

Background:

• Familial hypercholesterolemia (FH) is characterized by high low-density lipoprotein (LDL) cholesterol.
• Interindividual variability in lipid levels is influenced by genetic factors, including apolipoprotein E (apoE) polymorphism.
• Understanding these genetic influences is crucial for managing FH and cardiovascular risk.

Purpose of the Study:

• To investigate the impact of apolipoprotein E (apoE) polymorphism on lipid, lipoprotein, and apolipoprotein levels in familial hypercholesterolemia (FH) patients.
• To determine if the effects of apoE genotypes differ between sexes in FH patients.
• To identify specific apoE alleles associated with altered lipid profiles in this population.

Main Methods:

• Studied 147 women and 116 men with FH and a known LDL receptor gene mutation.
• Adjusted lipid traits for covariates (age, height, weight) separately for each sex.
• Estimated the effects of apoE genotypic variation on adjusted lipid and apolipoprotein levels.

Main Results:

• ApoE polymorphism significantly explained variability in adjusted lipid traits, with sex-specific effects.
• In women, apoE genotypes influenced total cholesterol, LDL cholesterol, and apoB levels.
• In men, apoE genotypes affected very-low-density lipoprotein (VLDL) cholesterol and triglyceride levels.
• The apoE epsilon 2 allele demonstrated an LDL cholesterol-lowering effect specifically in FH women.

Conclusions:

• Apolipoprotein E genotype significantly contributes to lipid variability in FH patients.
• Sex-specific effects of apoE polymorphism on lipid metabolism were observed in FH.
• The apoE epsilon 2 allele holds potential for targeted lipid-lowering strategies in FH women.