title: Gene-gene interactions among genetic variants from obesity candidate genes for nonobese and obese populations in type 2 diabetes.
abstract: Recent studies indicate that obesity may play a key role in modulating genetic predispositions to type 2 diabetes (T2D). This study examines the main effects of both single-locus and multilocus interactions among genetic variants in Taiwanese obese and nonobese individuals to test the hypothesis that obesity-related genes may contribute to the etiology of T2D independently and/or through such complex interactions. We genotyped 11 single nucleotide polymorphisms for 10 obesity candidate genes including adrenergic beta-2-receptor surface, adrenergic beta-3-receptor surface, angiotensinogen, fat mass and obesity associated gene, guanine nucleotide binding protein beta polypeptide 3 (GNB3), interleukin 6 receptor, proprotein convertase subtilisin/kexin type 1 (PCSK1), uncoupling protein 1, uncoupling protein 2, and uncoupling protein 3. There were 389 patients diagnosed with T2D and 186 age- and sex-matched controls. Single-locus analyses showed significant main effects of the GNB3 and PCSK1 genes on the risk of T2D among the nonobese group (p = 0.002 and 0.047, respectively). Further, interactions involving GNB3 and PCSK1 were suggested among the nonobese population using the generalized multifactor dimensionality reduction method (p = 0.001). In addition, interactions among angiotensinogen, fat mass and obesity associated gene, GNB3, and uncoupling protein 3 genes were found in a significant four-locus generalized multifactor dimensionality reduction model among the obese population (p = 0.001). The results suggest that the single nucleotide polymorphisms from the obesity candidate genes may contribute to the risk of T2D independently and/or in an interactive manner according to the presence or absence of obesity.
authors: Bioinformatics Division, Vita Genomics, Inc., Taipei County, Taiwan.
authors: Eugene
authors: E
authors: Lin
authors: Dee
authors: D
authors: Pei
authors: Yi-Jen
authors: YJ
authors: Huang
authors: Chang-Hsun
authors: CH
authors: Hsieh
authors: Lawrence Shih-Hsin
authors: LS
authors: Wu
mesh_terms: D000328:Adult; D000368:Aged; D015992:Body Mass Index; D016022:Case-Control Studies; D003924:Diabetes Mellitus, Type 2 / Q000175:diagnosis / Q000235:genetics*; D005260:Female; D020022:Genetic Predisposition to Disease / Q000235:genetics*; D014644:Genetic Variation; D020962:Heterotrimeric GTP-Binding Proteins / Q000235:genetics; D006801:Humans; D008297:Male; D008875:Middle Aged; D009765:Obesity / Q000175:diagnosis / Q000235:genetics*; D020641:Polymorphism, Single Nucleotide; D045664:Proprotein Convertase 1 / Q000235:genetics; D021122:Protein Subunits; D013624:Taiwan
chemical_list: C454420:G-protein beta3 subunit; D021122:Protein Subunits; D045664:Proprotein Convertase 1; D020962:Heterotrimeric GTP-Binding Proteins