Human Molecular Genetics Advance Access originally published online on March 25, 2004
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Human Molecular Genetics, 2004, Vol. 13, No. 10 993-1004
DOI: 10.1093/hmg/ddh119
Human Molecular Genetics, Vol. 13, No. 10 © Oxford University Press 2004; all rights reserved
Haplotypes and SNPs in 13 lipid-relevant genes explain most of the genetic variance in high-density lipoprotein and low-density lipoprotein cholesterol
1Medical Faculty of the Charité, Franz Volhard Clinic, Helios Klinikum, Berlin, Germany, 2Gene Mapping Center, 3Bioinformatics Section, Max Delbrück Center for Molecular Medicine, Berlin, Germany and 4Institute of Medical Genetics, Charité University Hospital, Humboldt University, Berlin, Germany
Received November 22, 2003; Revised February 17, 2004; Accepted March 15, 2004
Single nucleotide polymorphisms (SNPs) and derived haplotypes within multiple genes may explain genetic variance in complex traits; however, this hypothesis has not been rigorously tested. In an earlier study we analyzed six genes and have now expanded this investigation to include 13. We studied 250 families including 1054 individuals and measured lipid phenotypes. We focused on low-density cholesterol (LDL), high-density cholesterol (HDL) and their ratio (LDL/HDL). A component analysis of the phenotypic variance relying on a standard genetic model` showed that the genetic variance on LDL explained 26%, on HDL explained 38% and on LDL/HDL explained 28% of the total variance, respectively. Genotyping of 93 SNPs in 13 lipid-relevant genes generated 230 haplotypes. The association of haplotypes in all the genes tested explained a major fraction of the genetic phenotypic variance component. For LDL, the association with haplotypes explained 67% and for HDL 58% of the genetic variance relative to the polygenic background. We conclude that these haplotypes explain most of the genetic variance in LDL, HDL and LDL/HDL in these representative German families. An analysis of the contribution to the genetic variance at each locus showed that APOE (50%), CETP (28%), LIPC (9%), APOB (8%) and LDLR (5%) influenced variation in LDL. LIPC (53%), CETP (25%), ABCA1 (10%), LPL (6%) and LDLR (6%) influenced the HDL variance. The LDL/HDL ratio was primarily influenced by APOE (36%), CETP (27%) and LIPC (31%). This expanded analysis substantially increases the explanation of genetic variance on these complex traits.
* To whom correspondence should be addressed at: Franz Volhard Clinic, Wiltberg Strasse 50, 13125 Berlin, Germany. Tel: +49 3094172202; Fax: +49 3094172206; Email: luft{at}fvk-berlin.de
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