Association study of genetic variants of the ANGPTL3 gene and susceptibility to ischemic stroke

BACKGROUND: Stroke ranks as the third-leading cause of years of life lost worldwide. ANGPTL3 plays important roles in lipid metabolism, atherosclerosis, and occurrence of stroke. The purpose of this study was to evaluate associations of genetic variants in the ANGPTL3 gene with ischemic stroke (IS) risk. METHODS: A case–control study was conducted to evaluate the associations of tag single-nucleotide polymorphisms (SNPs) of the ANGPTL3 gene and risk of IS, as well as serum lipid levels. Dual-luciferase reporter assays in the HEK293T cell line was conducted to evaluate the promoter activity of ANGPTL3 rs6690733. RESULTS: We found rs6690733 (C vs A: OR 1.34, 95% CI 1.13–1.59; P=0.001) and rs12563308 (C vs T: OR 0.77, 95% CI 0.64–0.93, P=0.007) were significantly associated with susceptibility to IS. Even corrected for Bonferroni adjustment, the two variants were still significant (0.007×4=0.028). Carriers of the minor allele of SNP rs6690733 had significantly higher levels of TC and LDL-C, while carriers of the minor allele of SNP rs12563308 had significantly lower levels of TC and LDL-C (all P<0.05). For rs6690733, the luciferase assay showed that promoter activity was significantly increased by 67% of plasmids containing the minor C allele compared with the major A allele in HEK293 cells. CONCLUSION: Our study revealed genetic variants of the ANGPTL3 gene could contribute to susceptibility to IS through participating in the regulation of lipid metabolism.