Journal Article

Loci affecting gamma-glutamyl transferase in adults and adolescents show age × SNP interaction and cardiometabolic disease associations

Rita P. Middelberg, Beben Benyamin, Marleen H.M. de Moor, Nicole M. Warrington, Scott Gordon, Anjali K. Henders, Sarah E. Medland, Dale R. Nyholt, Eco J.C. de Geus, Jouke J. Hottenga, Gonneke Willemsen, Lawrence J. Beilin, Trevor A. Mori, Margaret J. Wright, Andrew C. Heath, Pamela A.F. Madden, Dorret I. Boomsma, Craig E. Pennell, Grant W. Montgomery, Nicholas G. Martin and John B. Whitfield

in Human Molecular Genetics

Volume 21, issue 2, pages 446-455
Published in print January 2012 | ISSN: 0964-6906
Published online October 2011 | e-ISSN: 1460-2083 | DOI: http://dx.doi.org/10.1093/hmg/ddr478
Loci affecting gamma-glutamyl transferase in adults and adolescents show age × SNP interaction and cardiometabolic disease associations

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Serum gamma-glutamyl transferase (GGT) activity is a marker of liver disease which is also prospectively associated with the risk of all-cause mortality, cardiovascular disease, type 2 diabetes and cancers. We have discovered novel loci affecting GGT in a genome-wide association study (rs1497406 in an intergenic region of chromosome 1, P = 3.9 × 10−8; rs944002 in C14orf73 on chromosome 14, P = 4.7 × 10−13; rs340005 in RORA on chromosome 15, P = 2.4 × 10−8), and a highly significant heterogeneity between adult and adolescent results at the GGT1 locus on chromosome 22 (maximum PHET = 5.6 × 10−12 at rs6519520). Pathway analysis of significant and suggestive single-nucleotide polymorphism associations showed significant overlap between genes affecting GGT and those affecting common metabolic and inflammatory diseases, and identified the hepatic nuclear factor (HNF) family as controllers of a network of genes affecting GGT. Our results reinforce the disease associations of GGT and demonstrate that control by the GGT1 locus varies with age.

Journal Article.  6461 words.  Illustrated.

Subjects: Genetics and Genomics

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