Our understanding of genetic influences on the response of lipids to specific interventions is limited. In this study, we sought to elucidate effects of rare genetic variants on lipid response to a high-fat meal challenge and fenofibrate (FFB) therapy in the Genetics of Lipid Lowering Drugs and Diet Network (GOLDN) cohort using an exome-wide sequencing-based association study. Our results showed that the rare coding variants in ITGA7, SIPA1L2, and CEP72 are significantly associated with fasting LDL cholesterol response to FFB (P = 1.24E-07), triglyceride postprandial area under the increase (AUI) (P = 2.31E-06), and triglyceride postprandial AUI response to FFB (P = 1.88E-06), respectively. We sought to replicate the association for SIPA1L2 in the Heredity and Phenotype Intervention (HAPI) Heart Study, which included a high-fat meal challenge but not FFB treatment. The associated rare variants in GOLDN were not observed in the HAPI Heart study, and thus the gene-based result was not replicated. For functional validation, we found that gene transcript level of SIPA1L2 is associated with triglyceride postprandial AUI (P < 0.05) in GOLDN. Our study suggests unique genetic mechanisms contributing to the lipid response to the high-fat meal challenge and FFB therapy.
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The work on the GOLDN study has been funded by National Institutes of Health Grants U01HL072524 and R01HL091357. The HAPI Heart Study was supported by National Institutes of Health Grants U01 HL072515 and P30 DK072488.
Due to the large number of funding sources, only the first few are listed in this section. For the complete list of funding sources, please download this article.
Supplemental Material can be found at: http://www.jlr.org/content/suppl/2018/02/20/jlr.P080333.DC1.html
Geng, Xin; Irvin, Marguerite R.; Hidalgo, Bertha; Aslibekyan, Stella; Srinivasasainagendra, Vinodh; An, Ping; Frazier-Wood, Alexis C.; Tiwari, Hemant K.; Dave, Tushar; Ryan, Kathleen; Ordovas, Jose M.; Straka, Robert J.; Feitosa, Mary F.; Hopkins, Paul N.; Borecki, Ingrid; Province, Michael A.; Mitchell, Braxton D.; Arnett, Donna K.; and Zhi, Degui, "An Exome-Wide Sequencing Study of Lipid Response to High-Fat Meal and Fenofibrate in Caucasians from the GOLDN Cohort" (2018). Epidemiology Faculty Publications. 27.