Functional Haplotype of Induces Triglyceride-Mediated Suppression of HDL-C Levels According to Genome-Wide Association Studies

Overview

Journal Genes (Basel)

Publisher MDPI

Date 2021 Jan 27

PMID 33499410

Citations 5

Authors

Yu-Huang Liao

Leay-Kiaw Er

Semon Wu

Yu-Lin Ko

Ming-Sheng Teng

Affiliations

Soon will be listed here.

Abstract

Hepatic lipase (encoded by ) is a glycoprotein in the triacylglycerol lipase family and mainly synthesized in and secreted from the liver. Previous studies demonstrated that hepatic lipase is crucial for reverse cholesterol transport and modulating metabolism and the plasma levels of several lipoproteins. This study was conducted to investigate the suppression effect of high-density lipoprotein cholesterol (HDL-C) levels in a genome-wide association study and explore the possible mechanisms linking triglyceride (TG) to variants and HDL-C. Genome-wide association data for TG and HDL-C were available for 4657 Taiwan-biobank participants. The prevalence of haplotypes in the promoter region and their effects were calculated. The cloned constructs of the haplotypes were expressed transiently in HepG2 cells and evaluated in a luciferase reporter assay. Genome-wide association analysis revealed that HDL-C was significantly associated with variations in after adjusting for TG. Three haplotypes (H1: TCG, H2: CTA and H3: CCA) in were identified. H2: CTA was significantly associated with HDL-C levels and H1: TCG suppressed HDL-C levels when a third factor, TG, was included in mediation analysis. The luciferase reporter assay further showed that the H2: CTA haplotype significantly inhibited luciferase activity compared with the H1: TCG haplotype. In conclusion, we identified a suppressive role for TG in the genome-wide association between and HDL-C. A functional haplotype of hepatic lipase may reduce HDL-C levels and is suppressed by TG.

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