TY - JOUR
T1 - Genetic evidence that raised sex hormone binding globulin (SHBG) levels reduce the risk of type 2 diabetes
AU - Perry, John R. B.
AU - Weedon, Michael N.
AU - Langenberg, Claudia
AU - Jackson, Anne U.
AU - Lyssenko, Valeriya
AU - Sparso, Thomas
AU - Thorleifsson, Gudmar
AU - Grallert, Harald
AU - Ferrucci, Luigi
AU - Maggio, Marcello
AU - Paolisso, Giuseppe
AU - Walker, Mark
AU - Palmer, Colin N. A.
AU - Payne, Felicity
AU - Young, Elizabeth
AU - Herder, Christian
AU - Narisu, Narisu
AU - Morken, Mario A.
AU - Bonnycastle, Lori L.
AU - Owen, Katharine R.
AU - Shields, Beverley
AU - Knight, Beatrice
AU - Bennett, Amanda
AU - Groves, Christopher J.
AU - Ruokonen, Aimo
AU - Jarvelin, Marjo Riitta
AU - Pearson, Ewan
AU - Pascoe, Laura
AU - Ferrannini, Ele
AU - Bornstein, Stefan R.
AU - Stringham, Heather M.
AU - Scott, Laura J.
AU - Kuusisto, Johanna
AU - Nilsson, Peter
AU - Neptin, Malin
AU - Gjesing, Anette P.
AU - Pisinger, Charlotta
AU - Lauritzen, Torsten
AU - Sandbaek, Annelli
AU - Sampson, Mike
AU - Magic, Ele Zeggini
AU - Lindgren, Cecilia M.
AU - Steinthorsdottir, Valgerdur
AU - Thorsteinsdottir, Unnur
AU - Hansen, Torben
AU - Schwarz, Peter
AU - Illig, Thomas
AU - Laakso, Markku
AU - Stefansson, Kari
AU - Morris, Andrew D.
AU - Groop, Leif
AU - Pedersen, Oluf
AU - Boehnke, Michael
AU - Barroso, Ines
AU - Wareham, Nicholas J.
AU - Hattersley, Andrew T.
AU - McCarthy, Mark I.
AU - Frayling, Timothy M.
PY - 2010
Y1 - 2010
N2 - Epidemiological studies consistently show that circulating sex hormone binding globulin (SHBG) levels are lower in type 2 diabetes patients than non-diabetic individuals, but the causal nature of this association is controversial. Genetic studies can help dissect causal directions of epidemiological associations because genotypes are much less likely to be confounded, biased or influenced by disease processes. Using this Mendelian randomization principle, we selected a common single nucleotide polymorphism (SNP) near the SHBG gene, rs1799941, that is strongly associated with SHBG levels. We used data from this SNP, or closely correlated SNPs, in 27 657 type 2 diabetes patients and 58 481 controls from 15 studies. We then used data from additional studies to estimate the difference in SHBG levels between type 2 diabetes patients and controls. The SHBG SNP rs1799941 was associated with type 2 diabetes [odds ratio (OR) 0.94, 95% CI: 0.91, 0.97; P = 2 x 10(-5)], with the SHBG raising allele associated with reduced risk of type 2 diabetes. This effect was very similar to that expected (OR 0.92, 95% CI: 0.88, 0.96), given the SHBG-SNP versus SHBG levels association (SHBG levels are 0.2 standard deviations higher per copy of the A allele) and the SHBG levels versus type 2 diabetes association (SHBG levels are 0.23 standard deviations lower in type 2 diabetic patients compared to controls). Results were very similar in men and women. There was no evidence that this variant is associated with diabetes-related intermediate traits, including several measures of insulin secretion and resistance. Our results, together with those from another recent genetic study, strengthen evidence that SHBG and sex hormones are involved in the aetiology of type 2 diabetes.
AB - Epidemiological studies consistently show that circulating sex hormone binding globulin (SHBG) levels are lower in type 2 diabetes patients than non-diabetic individuals, but the causal nature of this association is controversial. Genetic studies can help dissect causal directions of epidemiological associations because genotypes are much less likely to be confounded, biased or influenced by disease processes. Using this Mendelian randomization principle, we selected a common single nucleotide polymorphism (SNP) near the SHBG gene, rs1799941, that is strongly associated with SHBG levels. We used data from this SNP, or closely correlated SNPs, in 27 657 type 2 diabetes patients and 58 481 controls from 15 studies. We then used data from additional studies to estimate the difference in SHBG levels between type 2 diabetes patients and controls. The SHBG SNP rs1799941 was associated with type 2 diabetes [odds ratio (OR) 0.94, 95% CI: 0.91, 0.97; P = 2 x 10(-5)], with the SHBG raising allele associated with reduced risk of type 2 diabetes. This effect was very similar to that expected (OR 0.92, 95% CI: 0.88, 0.96), given the SHBG-SNP versus SHBG levels association (SHBG levels are 0.2 standard deviations higher per copy of the A allele) and the SHBG levels versus type 2 diabetes association (SHBG levels are 0.23 standard deviations lower in type 2 diabetic patients compared to controls). Results were very similar in men and women. There was no evidence that this variant is associated with diabetes-related intermediate traits, including several measures of insulin secretion and resistance. Our results, together with those from another recent genetic study, strengthen evidence that SHBG and sex hormones are involved in the aetiology of type 2 diabetes.
KW - GENOME-WIDE ASSOCIATION
KW - AUGSBURG CASE-COHORT
KW - MENDELIAN RANDOMIZATION
KW - INSULIN SENSITIVITY
KW - PROSTATE-CANCER
KW - TESTOSTERONE TREATMENT
KW - POSTMENOPAUSAL WOMEN
KW - SERUM CONCENTRATIONS
KW - STEROID-HORMONES
KW - BODY-COMPOSITION
U2 - 10.1093/hmg/ddp522
DO - 10.1093/hmg/ddp522
M3 - Article
C2 - 19933169
SN - 0964-6906
VL - 19
SP - 535
EP - 544
JO - Human Molecular Genetics
JF - Human Molecular Genetics
IS - 3
ER -