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Genetic Variant Increases Triglyceride Levels In Asian-Americans

Date:
July 18, 2008
Source:
American Society for Biochemistry and Molecular Biology
Summary:
A genetic variant found almost exclusively in individuals of Asian descent increases the risk of elevated plasma triglycerides over four-fold. In fact, all 11 subjects who carried both copies of this rare variant for apolipoprotein A-V had extremely high and dangerous triglyceride levels in their blood.

A genetic variant found almost exclusively in individuals of Asian descent increases the risk of elevated triglycerides over four-fold, reports a comprehensive study in the Journal of Lipid Research. In fact, all 11 subjects who carried both copies of this rare variant for apolipoprotein A-V had extremely high and dangerous triglyceride levels in their blood.

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Apolipoprotein A-V is a recently discovered lipid-binding protein that likely plays an important role in metabolizing triglycerides. Some population studies with groups in China and Taiwan indicate that a polymorphism in the APOA5 gene (553 G>T shift) is associated with elevated plasma TG levels, which like cholesterol, increase the risk of heart disease.

To get a broader view of this potentially important gene polymorphism, Clive Pullinger and colleagues examined the frequency and impact of this variant in a population of Chinese-Americans, as well as four other Asian-American populations (Japanese, Korean, Southeast Asian, and Pacific Islander).

The researchers examined 541 individuals and found that 15.1% of Chinese-Americans with high plasma TG (>150 mg/dl) carried at least one copy of the 553T variant, compared with only 3.7% of those with normal TG levels; in non-Chinese Asians these values were 13.7% and 5.4%. When calculated, the 553T variant corresponds to a 4.4 and 2.5 times greater risk of elevated TG in Chinese-Americans and other Asians, respectively.

The frequency became even more prevalent at higher levels; 60% of individuals with TG of >500 mg/dl carried the variant, and at 1000 mg/dl the frequency rose to 80%. And the 11 subjects who had the variant in both copies of their APOA5 gene had an average TG concentration of over 2000 mg/dl, which can pose serious health risks.

This specific genetic change seems restricted to Asians, as the researchers studied 779 non-Asian subjects and found only 3 incidences of the 553T variant (2 Caucasian and 1 Hispanic).


Story Source:

The above story is based on materials provided by American Society for Biochemistry and Molecular Biology. Note: Materials may be edited for content and length.


Journal Reference:

  1. Pullinger et al. An apolipoprotein A-V gene SNP is associated with marked hypertriglyceridemia among Asian-American patients. The Journal of Lipid Research, 2008; 49 (8): 1846 DOI: 10.1194/jlr.P800011-JLR200

Cite This Page:

American Society for Biochemistry and Molecular Biology. "Genetic Variant Increases Triglyceride Levels In Asian-Americans." ScienceDaily. ScienceDaily, 18 July 2008. <www.sciencedaily.com/releases/2008/07/080717110234.htm>.
American Society for Biochemistry and Molecular Biology. (2008, July 18). Genetic Variant Increases Triglyceride Levels In Asian-Americans. ScienceDaily. Retrieved November 21, 2014 from www.sciencedaily.com/releases/2008/07/080717110234.htm
American Society for Biochemistry and Molecular Biology. "Genetic Variant Increases Triglyceride Levels In Asian-Americans." ScienceDaily. www.sciencedaily.com/releases/2008/07/080717110234.htm (accessed November 21, 2014).

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