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Meta-Analysis
. 2014 Feb 27;10(2):e1004123.
doi: 10.1371/journal.pgen.1004123. eCollection 2014 Feb.

Identification of novel genetic Loci associated with thyroid peroxidase antibodies and clinical thyroid disease

Marco Medici  1 Eleonora Porcu  2 Giorgio Pistis  3 Alexander Teumer  4 Suzanne J Brown  5 Richard A Jensen  6 Rajesh Rawal  7 Greet L Roef  8 Theo S Plantinga  9 Sita H Vermeulen  10 Jari Lahti  11 Matthew J Simmonds  12 Lise Lotte N Husemoen  13 Rachel M Freathy  14 Beverley M Shields  15 Diana Pietzner  16 Rebecca Nagy  17 Linda Broer  18 Layal Chaker  1 Tim I M Korevaar  1 Maria Grazia Plia  19 Cinzia Sala  3 Uwe Völker  4 J Brent Richards  20 Fred C Sweep  10 Christian Gieger  7 Tanguy Corre  3 Eero Kajantie  21 Betina Thuesen  13 Youri E Taes  8 W Edward Visser  1 Andrew T Hattersley  15 Jürgen Kratzsch  22 Alexander Hamilton  12 Wei Li  17 Georg Homuth  4 Monia Lobina  19 Stefano Mariotti  23 Nicole Soranzo  24 Massimiliano Cocca  3 Matthias Nauck  25 Christin Spielhagen  25 Alec Ross  10 Alice Arnold  26 Martijn van de Bunt  12 Sandya Liyanarachchi  17 Margit Heier  27 Hans Jörgen Grabe  28 Corrado Masciullo  3 Tessel E Galesloot  10 Ee M Lim  29 Eva Reischl  30 Peter J Leedman  31 Sandra Lai  19 Alessandro Delitala  23 Alexandra P Bremner  32 David I W Philips  33 John P Beilby  34 Antonella Mulas  19 Matteo Vocale  35 Goncalo Abecasis  36 Tom Forsen  37 Alan James  38 Elisabeth Widen  39 Jennie Hui  29 Holger Prokisch  40 Ernst E Rietzschel  41 Aarno Palotie  42 Peter Feddema  43 Stephen J Fletcher  29 Katharina Schramm  44 Jerome I Rotter  45 Alexander Kluttig  16 Dörte Radke  46 Michela Traglia  3 Gabriela L Surdulescu  47 Huiling He  17 Jayne A Franklyn  48 Daniel Tiller  16 Bijay Vaidya  49 Tim de Meyer  50 Torben Jørgensen  51 Johan G Eriksson  52 Peter C O'Leary  53 Eric Wichmann  54 Ad R Hermus  9 Bruce M Psaty  55 Till Ittermann  46 Albert Hofman  18 Emanuele Bosi  56 David Schlessinger  57 Henri Wallaschofski  22 Nicola Pirastu  58 Yurii S Aulchenko  18 Albert de la Chapelle  17 Romana T Netea-Maier  9 Stephen C L Gough  12 Henriette Meyer Zu Schwabedissen  59 Timothy M Frayling  14 Jean-Marc Kaufman  8 Allan Linneberg  13 Katri Räikkönen  11 Johannes W A Smit  9 Lambertus A Kiemeney  10 Fernando Rivadeneira  60 André G Uitterlinden  60 John P Walsh  61 Christa Meisinger  27 Martin den Heijer  62 Theo J Visser  1 Timothy D Spector  47 Scott G Wilson  63 Henry Völzke  46 Anne Cappola  64 Daniela Toniolo  65 Serena Sanna  19 Silvia Naitza  19 Robin P Peeters  1
Affiliations
Meta-Analysis

Identification of novel genetic Loci associated with thyroid peroxidase antibodies and clinical thyroid disease

Marco Medici et al. PLoS Genet. .

Abstract

Autoimmune thyroid diseases (AITD) are common, affecting 2-5% of the general population. Individuals with positive thyroid peroxidase antibodies (TPOAbs) have an increased risk of autoimmune hypothyroidism (Hashimoto's thyroiditis), as well as autoimmune hyperthyroidism (Graves' disease). As the possible causative genes of TPOAbs and AITD remain largely unknown, we performed GWAS meta-analyses in 18,297 individuals for TPOAb-positivity (1769 TPOAb-positives and 16,528 TPOAb-negatives) and in 12,353 individuals for TPOAb serum levels, with replication in 8,990 individuals. Significant associations (P<5×10(-8)) were detected at TPO-rs11675434, ATXN2-rs653178, and BACH2-rs10944479 for TPOAb-positivity, and at TPO-rs11675434, MAGI3-rs1230666, and KALRN-rs2010099 for TPOAb levels. Individual and combined effects (genetic risk scores) of these variants on (subclinical) hypo- and hyperthyroidism, goiter and thyroid cancer were studied. Individuals with a high genetic risk score had, besides an increased risk of TPOAb-positivity (OR: 2.18, 95% CI 1.68-2.81, P = 8.1×10(-8)), a higher risk of increased thyroid-stimulating hormone levels (OR: 1.51, 95% CI 1.26-1.82, P = 2.9×10(-6)), as well as a decreased risk of goiter (OR: 0.77, 95% CI 0.66-0.89, P = 6.5×10(-4)). The MAGI3 and BACH2 variants were associated with an increased risk of hyperthyroidism, which was replicated in an independent cohort of patients with Graves' disease (OR: 1.37, 95% CI 1.22-1.54, P = 1.2×10(-7) and OR: 1.25, 95% CI 1.12-1.39, P = 6.2×10(-5)). The MAGI3 variant was also associated with an increased risk of hypothyroidism (OR: 1.57, 95% CI 1.18-2.10, P = 1.9×10(-3)). This first GWAS meta-analysis for TPOAbs identified five newly associated loci, three of which were also associated with clinical thyroid disease. With these markers we identified a large subgroup in the general population with a substantially increased risk of TPOAbs. The results provide insight into why individuals with thyroid autoimmunity do or do not eventually develop thyroid disease, and these markers may therefore predict which TPOAb-positives are particularly at risk of developing clinical thyroid dysfunction.

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Conflict of interest statement

I have read the journal's policy and have the following conflicts: Dr. Bruce M Psaty reported serving on a DSMB for a clinical trial of a device funded by the manufacturer (Zoll LifeCor) and on the Yale Open Data Access Project funded by Medtronic. All other authors have declared that no competing interests exist.

Figures

Figure 1
Figure 1. Genome wide association studies meta-analyses: Loci associated with TPOAb-positivity (a–c) and TPOAb levels (d–f) on a genome-wide level of significance.
Regional association plots of the genome-wide significant loci associated with TPOAb positivity (a–c) and TPOAb levels (d–f). The y-axis on the left indicates the – log10 P value for the association with TPOAb –positivity (a–c) or TPOAb levels (d–f). SNPs are plotted on the x-axis according to their chromosomal position against the association with the phenotype on the y-axis. The most significant stage 1 SNP is indicated in purple. The combined stage 1 and 2 result of this SNP is indicated in yellow. The SNPs surrounding the most significant SNP are color-coded to reflect their LD with this SNP. Symbols reflect functional genomic annotation, as indicated in the legend. The blue y-axes on the right of each plot indicate the estimated recombination rates (based on HapMap Phase II); the bottom of each panel shows the respective annotated genes at the locus and their transcriptional direction. Mb, megabases.

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