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标题：Methylation at CPT1A locus is associated with lipoprotein subfraction profiles
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作者：Alexis C. Frazier-Wood ; Stella Aslibekyan ; Devin M. Absher 等
期刊名称：JLR Papers In Press
印刷版ISSN：0022-2275
电子版ISSN：1539-7262
出版年度：2014
卷号：55
期号：7
页码：1324-1330
DOI：10.1194/jlr.M048504
语种：English
出版社：American Society for Biochemistry and Molecular Biology
摘要：Lipoprotein subfractions help discriminate cardiometabolic disease risk. Genetic loci validated as associating with lipoprotein measures do not account for a large proportion of the individual variation in lipoprotein measures. We hypothesized that DNA methylation levels across the genome contribute to interindividual variation in lipoprotein measures. Using data from participants of the Genetics of Lipid Lowering Drugs and Diet Network (n = 663 for discovery and n = 331 for replication stages, respectively), we conducted the first systematic screen of the genome to determine associations between methylation status at ∼470,000 cytosine-guanine dinucleotide (CpG) sites in CD4⁺ T cells and 14 lipoprotein subfraction measures. We modeled associations between methylation at each CpG site and each lipoprotein measure separately using linear mixed models, adjusted for age, sex, study site, cell purity, and family structure. We identified two CpGs, both in the carnitine palmitoyltransferase-1A ( CPT1A ) gene, which reached significant levels of association with VLDL and LDL subfraction parameters in both discovery and replication phases ( P −7 in the discovery phase, P P −12 in the full sample). CPT1A is regulated by PPARα, a ligand for drugs used to reduce CVD. Our associations between methylation in CPT1A and lipoprotein measures highlight the epigenetic role of this gene in metabolic dysfunction.
关键词：epigenome-wide association study ; low density lipoprotein size ; very low density lipoprotein size ; high density lipoprotein size ; lipoprotein diameter ; lipoprotein particle number ; nuclear magnetic resonance data ; Genetics of Lipid Lowering Drugs and Diet Network ; carnitine palmitoyltransferase-1A