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1.
Nat Genet ; 40(5): 638-45, 2008 May.
Article in English | MEDLINE | ID: mdl-18372903

ABSTRACT

Genome-wide association (GWA) studies have identified multiple loci at which common variants modestly but reproducibly influence risk of type 2 diabetes (T2D). Established associations to common and rare variants explain only a small proportion of the heritability of T2D. As previously published analyses had limited power to identify variants with modest effects, we carried out meta-analysis of three T2D GWA scans comprising 10,128 individuals of European descent and approximately 2.2 million SNPs (directly genotyped and imputed), followed by replication testing in an independent sample with an effective sample size of up to 53,975. We detected at least six previously unknown loci with robust evidence for association, including the JAZF1 (P = 5.0 x 10(-14)), CDC123-CAMK1D (P = 1.2 x 10(-10)), TSPAN8-LGR5 (P = 1.1 x 10(-9)), THADA (P = 1.1 x 10(-9)), ADAMTS9 (P = 1.2 x 10(-8)) and NOTCH2 (P = 4.1 x 10(-8)) gene regions. Our results illustrate the value of large discovery and follow-up samples for gaining further insights into the inherited basis of T2D.


Subject(s)
Diabetes Mellitus, Type 2/genetics , Genetic Predisposition to Disease , Genome, Human , Humans , Polymorphism, Single Nucleotide
2.
Science ; 316(5829): 1341-5, 2007 Jun 01.
Article in English | MEDLINE | ID: mdl-17463248

ABSTRACT

Identifying the genetic variants that increase the risk of type 2 diabetes (T2D) in humans has been a formidable challenge. Adopting a genome-wide association strategy, we genotyped 1161 Finnish T2D cases and 1174 Finnish normal glucose-tolerant (NGT) controls with >315,000 single-nucleotide polymorphisms (SNPs) and imputed genotypes for an additional >2 million autosomal SNPs. We carried out association analysis with these SNPs to identify genetic variants that predispose to T2D, compared our T2D association results with the results of two similar studies, and genotyped 80 SNPs in an additional 1215 Finnish T2D cases and 1258 Finnish NGT controls. We identify T2D-associated variants in an intergenic region of chromosome 11p12, contribute to the identification of T2D-associated variants near the genes IGF2BP2 and CDKAL1 and the region of CDKN2A and CDKN2B, and confirm that variants near TCF7L2, SLC30A8, HHEX, FTO, PPARG, and KCNJ11 are associated with T2D risk. This brings the number of T2D loci now confidently identified to at least 10.


Subject(s)
Diabetes Mellitus, Type 2/genetics , Genetic Predisposition to Disease , Genome, Human , Polymorphism, Single Nucleotide , Case-Control Studies , Chromosome Mapping , Chromosomes, Human, Pair 11/genetics , DNA, Intergenic , Female , Finland , Genes, p16 , Genotype , Humans , Insulin-Like Growth Factor Binding Proteins/genetics , Introns , Logistic Models , Male , Meta-Analysis as Topic , Middle Aged
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