Aim: The aim of this study is to analyze the effect of apolipoprotein E (apo E) and methylenetetrahydrofolate reductase (MTHFR) gene polymorphisms on serum lipid and homocysteine levels in the general Japanese population.

Methods: We analyzed the polymorphisms in individuals randomly selected from among participants of Serum Lipid Survey 2000.

Results: The frequency of the epsilon2, epsilon3, and epsilon4 alleles of APOE was 4.2, 85.3, and 10.5%, respectively. Individuals with the genotype epsilon4/epsilon4 had the highest total and low-density lipoprotein (LDL) cholesterol levels, while those with epsilon2/epsilon2 had the lowest. Individuals with the epsilon2/epsilon2 and epsilon2/epsilon4 genotypes had higher remnant-like particles (RLP)-cholesterol levels than those with epsilon2epsilon3, epsilon3epsilon3, and epsilon3epsilon4. There was a trend for individuals with the epsilon2/epsilon4 and epsilon2/epsilon2 genotypes to have higher triglyceride levels, although the difference was not significant. The presence of the T allele in a MTHFR polymorphism (C667T) was associated with higher homocysteine levels, which is more prominent in men than in women.

Conclusion: Thus in our large-scale analysis we have shown that RLP-cholesterol is better associated with, APOE genotype than triglyceride and the effect of the T allele on MTHFR polymorphism (C667T) homocysteine levels is more prominent in men than in women among Japanese.

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http://dx.doi.org/10.5551/jat.e499DOI Listing

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