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Genetic architecture of circulating lipid levels

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Authors:
  • Demirkan, Ayşe ;
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  • Amin, Najaf ;
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  • Isaacs, Aaron ;
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  • Jarvelin, Marjo-Riitta ;
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  • Whitfield, John B ;
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  • Wichmann, Heinz-Erich ;
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  • Kyvik, Kirsten O H M ;
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    Orcid logo0000-0003-2981-0245
    Open - Odense Patient data Explorative Network, Department of Clinical Research, Faculty of Health Sciences, SDU
  • Rudan, Igor ;
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  • Gieger, Christian ;
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  • Hicks, Andrew A ;
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  • Johansson, Åsa ;
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  • Hottenga, Jouke-Jan ;
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  • Smith, Johannes J ;
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  • Wild, Sarah H ;
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  • Pedersen, Nancy L ;
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  • Willemsen, Gonneke ;
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  • Mangino, Massimo ;
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  • Hayward, Caroline ;
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  • Uitterlinden, André G ;
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  • Hofman, Albert ;
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  • Witteman, Jacqueline ;
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  • Montgomery, Grant W ;
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  • Pietiläinen, Kirsi H ;
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  • Rantanen, Taina ;
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  • Kaprio, Jaakko ;
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  • Döring, Angela ;
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  • Pramstaller, Peter P ;
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  • Gyllensten, Ulf ;
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  • de Geus, Eco J C ;
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  • Penninx, Brenda W ;
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  • Wilson, James ;
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  • Rivadeneria, Fernando ;
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  • Magnusson, Patrik K E ;
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  • Boomsma, Dorret I ;
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  • Spector, Tim ;
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  • Campbell, Harry ;
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  • Hoehne, Birgit ;
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  • Martin, Nicholas G ;
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  • Oostra, Ben A ;
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  • McCarthy, Mark ;
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  • Peltonen-Palotie, Leena ;
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  • Aulchenko, Yurii ;
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  • Visscher, Peter M ;
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  • Ripatti, Samuli ;
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  • Janssens, A Cecile J W ;
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  • van Duijn, Cornelia M
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DOI:
10.1038/ejhg.2011.21
Abstract:
Serum concentrations of low-density lipoprotein cholesterol (LDL-C), high-density lipoprotein cholesterol (HDL-C), triglycerides (TGs) and total cholesterol (TC) are important heritable risk factors for cardiovascular disease. Although genome-wide association studies (GWASs) of circulating lipid levels have identified numerous loci, a substantial portion of the heritability of these traits remains unexplained. Evidence of unexplained genetic variance can be detected by combining multiple independent markers into additive genetic risk scores. Such polygenic scores, constructed using results from the ENGAGE Consortium GWAS on serum lipids, were applied to predict lipid levels in an independent population-based study, the Rotterdam Study-II (RS-II). We additionally tested for evidence of a shared genetic basis for different lipid phenotypes. Finally, the polygenic score approach was used to identify an alternative genome-wide significance threshold before pathway analysis and those results were compared with those based on the classical genome-wide significance threshold. Our study provides evidence suggesting that many loci influencing circulating lipid levels remain undiscovered. Cross-prediction models suggested a small overlap between the polygenic backgrounds involved in determining LDL-C, HDL-C and TG levels. Pathway analysis utilizing the best polygenic score for TC uncovered extra information compared with using only genome-wide significant loci. These results suggest that the genetic architecture of circulating lipids involves a number of undiscovered variants with very small effects, and that increasing GWAS sample sizes will enable the identification of novel variants that regulate lipid levels.
Type:
Journal article
Language:
English
Published in:
European Journal of Human Genetics, 2011, Vol 19, Issue 7, p. 813-9
Keywords:
Female; Genome-Wide Association Study; Humans; Lipid Metabolism; Lipids; Male; Metabolic Networks and Pathways; Models, Genetic; Phenotype; Polymorphism, Single Nucleotide; Quantitative Trait Loci; Risk
Main Research Area:
Medical science
Publication Status:
Published
Review type:
Peer Review
Submission year:
2011
Scientific Level:
Scientific
ID:
183328091

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