title: Underlying genetic models of inheritance in established type 2 diabetes associations.
abstract: For most associations of common single nucleotide polymorphisms (SNPs) with common diseases, the genetic model of inheritance is unknown. The authors extended and applied a Bayesian meta-analysis approach to data from 19 studies on 17 replicated associations with type 2 diabetes. For 13 SNPs, the data fitted very well to an additive model of inheritance for the diabetes risk allele; for 4 SNPs, the data were consistent with either an additive model or a dominant model; and for 2 SNPs, the data were consistent with an additive or recessive model. Results were robust to the use of different priors and after exclusion of data for which index SNPs had been examined indirectly through proxy markers. The Bayesian meta-analysis model yielded point estimates for the genetic effects that were very similar to those previously reported based on fixed- or random-effects models, but uncertainty about several of the effects was substantially larger. The authors also examined the extent of between-study heterogeneity in the genetic model and found generally small between-study deviation values for the genetic model parameter. Heterosis could not be excluded for 4 SNPs. Information on the genetic model of robustly replicated association signals derived from genome-wide association studies may be useful for predictive modeling and for designing biologic and functional experiments.
authors: Clinical and Molecular Epidemiology Unit and Clinical Trials and Evidence-Based Medicine Unit, Department of Hygiene and Epidemiology, School of Medicine, University of Ioannina, Ioannina, Greece.
authors: Georgia
authors: G
authors: Salanti
authors: Lorraine
authors: L
authors: Southam
authors: David
authors: D
authors: Altshuler
authors: Kristin
authors: K
authors: Ardlie
authors: Inês
authors: I
authors: Barroso
authors: Michael
authors: M
authors: Boehnke
authors: Marilyn C
authors: MC
authors: Cornelis
authors: Timothy M
authors: TM
authors: Frayling
authors: Harald
authors: H
authors: Grallert
authors: Niels
authors: N
authors: Grarup
authors: Leif
authors: L
authors: Groop
authors: Torben
authors: T
authors: Hansen
authors: Andrew T
authors: AT
authors: Hattersley
authors: Frank B
authors: FB
authors: Hu
authors: Kristian
authors: K
authors: Hveem
authors: Thomas
authors: T
authors: Illig
authors: Johanna
authors: J
authors: Kuusisto
authors: Markku
authors: M
authors: Laakso
authors: Claudia
authors: C
authors: Langenberg
authors: Valeriya
authors: V
authors: Lyssenko
authors: Mark I
authors: MI
authors: McCarthy
authors: Andrew
authors: A
authors: Morris
authors: Andrew D
authors: AD
authors: Morris
authors: Colin N A
authors: CN
authors: Palmer
authors: Felicity
authors: F
authors: Payne
authors: Carl G P
authors: CG
authors: Platou
authors: Laura J
authors: LJ
authors: Scott
authors: Benjamin F
authors: BF
authors: Voight
authors: Nicholas J
authors: NJ
authors: Wareham
authors: Eleftheria
authors: E
authors: Zeggini
authors: John P A
authors: JP
authors: Ioannidis
mesh_terms: D001499:Bayes Theorem; D003924:Diabetes Mellitus, Type 2 / Q000235:genetics*; D006801:Humans; D008957:Models, Genetic; D020641:Polymorphism, Single Nucleotide / Q000235:genetics*