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Träfflista för sökning "WFRF:(Nilsson Peter) ;pers:(Lyssenko Valeriya);pers:(Lindholm Eero)"

Sökning: WFRF:(Nilsson Peter) > Lyssenko Valeriya > Lindholm Eero

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1.
  • Mahajan, Anubha, et al. (författare)
  • Genome-wide trans-ancestry meta-analysis provides insight into the genetic architecture of type 2 diabetes susceptibility
  • 2014
  • Ingår i: Nature Genetics. - Nature Publishing Group. - 1061-4036. ; 46:3, s. 234-
  • Tidskriftsartikel (refereegranskat)abstract
    • To further understanding of the genetic basis of type 2 diabetes (T2D) susceptibility, we aggregated published meta-analyses of genome-wide association studies (GWAS), including 26,488 cases and 83,964 controls of European, east Asian, south Asian and Mexican and Mexican American ancestry. We observed a significant excess in the directional consistency of T2D risk alleles across ancestry groups, even at SNPs demonstrating only weak evidence of association. By following up the strongest signals of association from the trans-ethnic meta-analysis in an additional 21,491 cases and 55,647 controls of European ancestry, we identified seven new T2D susceptibility loci. Furthermore, we observed considerable improvements in the fine-mapping resolution of common variant association signals at several T2D susceptibility loci. These observations highlight the benefits of trans-ethnic GWAS for the discovery and characterization of complex trait loci and emphasize an exciting opportunity to extend insight into the genetic architecture and pathogenesis of human diseases across populations of diverse ancestry.
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2.
  • Morris, Andrew P., et al. (författare)
  • Large-scale association analysis provides insights into the genetic architecture and pathophysiology of type 2 diabetes
  • 2012
  • Ingår i: Nature Genetics. - Nature Publishing Group. - 1061-4036. ; 44:9, s. 981-
  • Tidskriftsartikel (refereegranskat)abstract
    • To extend understanding of the genetic architecture and molecular basis of type 2 diabetes (T2D), we conducted a meta-analysis of genetic variants on the Metabochip, including 34,840 cases and 114,981 controls, overwhelmingly of European descent. We identified ten previously unreported T2D susceptibility loci, including two showing sex-differentiated association. Genomewide analyses of these data are consistent with a long tail of additional common variant loci explaining much of the variation in susceptibility to T2D. Exploration of the enlarged set of susceptibility loci implicates several processes, including CREBBP-related transcription, adipocytokine signaling and cell cycle regulation, in diabetes pathogenesis.
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3.
  • Guey, Lin T., et al. (författare)
  • Power in the Phenotypic Extremes: A Simulation Study of Power in Discovery and Replication of Rare Variants
  • 2011
  • Ingår i: Genetic Epidemiology. - Wiley-Blackwell Publishing, Inc. - 0741-0395. ; 35:4, s. 236-246
  • Tidskriftsartikel (refereegranskat)abstract
    • Next-generation sequencing technologies are making it possible to study the role of rare variants in human disease. Many studies balance statistical power with cost-effectiveness by (a) sampling from phenotypic extremes and (b) utilizing a two-stage design. Two-stage designs include a broad-based discovery phase and selection of a subset of potential causal genes/variants to be further examined in independent samples. We evaluate three parameters: first, the gain in statistical power due to extreme sampling to discover causal variants; second, the informativeness of initial (Phase I) association statistics to select genes/variants for follow-up; third, the impact of extreme and random sampling in (Phase 2) replication. We present a quantitative method to select individuals from the phenotypic extremes of a binary trait, and simulate disease association studies under a variety of sample sizes and sampling schemes. First, we find that while studies sampling from extremes have excellent power to discover rare variants, they have limited power to associate them to phenotype-suggesting high false-negative rates for upcoming studies. Second, consistent with previous studies, we find that the effect sizes estimated in these studies are expected to be systematically larger compared with the overall population effect size; in a well-cited lipids study, we estimate the reported effect to be twofold larger. Third, replication studies require large samples from the general population to have sufficient power; extreme sampling could reduce the required sample size as much as fourfold. Our observations offer practical guidance for the design and interpretation of studies that utilize extreme sampling. Genet. Epidemiol. 35: 236-246, 2011. (c) 2011 Wiley-Liss, Inc.
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4.
  • Cervin, Camilla, et al. (författare)
  • GENETIC SIMILARITIES BETWEEN LADA, TYPE 1 AND TYPE 2 DIABETES.
  • 2008
  • Ingår i: Diabetes. - 1939-327X. ; :March 13
  • Tidskriftsartikel (refereegranskat)abstract
    • Aim: LADA is often considered a slowly progressing subtype of type 1 diabetes, although the clinical picture resembles more type 2 diabetes. One way to improve classification is to study whether LADA shares genetic features with type 1 and/or type 2 diabetes. Methods/Results: To accomplish this, we studied whether LADA shares variation in the HLA locus, INS VNTR, PTPN22 genes with type 1 or the TCF7L2 gene with type 2 diabetes, in 361 LADA, 718 type 1, 1676 type 2 diabetic patients and 1704 healthy control subjects from Sweden and Finland. LADA showed, compared to type 2 diabetic patients, increased frequency of risk HLA-DQB1 *0201/*0302 genotype (27% vs. 6.9%; p<1x10(-6)), with similar frequency as to type 1 diabetes (36%). In addition, LADA showed higher frequencies of protective HLA-DQB1 *0602(3)/X than type 1 diabetic patients (8.1% vs. 3.2%, p=0.003). The AA-genotype of rs689, referring to the class I allele in the INS VNTR, as well as the CT/TT-genotypes of rs2476601 in the PTPN22 gene were increased both in T1D (p=3x10(-14) and p=1x10(-10), respectively) and LADA (p=0.001 and p=0.002), as compared to controls. Notably, the frequency of the type 2 diabetes-associated CT/TT-genotypes of rs7903146 in the TCF7L2 were increased in LADA (52.8%; p=0.03), to the same extent as in type 2 diabetes (54.1%, p=3x10(-7)), as compared with controls (44.8%) and type 1 diabetes (43.3%). Conclusions: LADA shares genetic features with both type 1 (HLA, INS VNTR and PTPN22) and type 2 (TCF7L2) diabetes, which justifies considering LADA as an admixture of the two major types of diabetes.
5.
  • Cervin, Camilla, et al. (författare)
  • Genetic similarities between latent autoimmune diabetes in adults, type 1 diabetes, and type 2 diabetes
  • 2008
  • Ingår i: Diabetes. - American Diabetes Association. - 0012-1797. ; 57:5, s. 1433-1437
  • Tidskriftsartikel (refereegranskat)abstract
    • OBJECTIVE-Latent autoimmune diabetes in adults (LADA) is often considered a slowly progressing subtype of type 1 diabetes, although the clinical picture more resembles type 2 diabetes. One way to improve classification is to study whether LADA shares genetic features with type 1 and/or type 2 diabetes. RESEARCH DESIGN AND METHODS-To accomplish this we studied whether LADA shares variation in the HLA locus or INS VNTR and PTPN22 genes with type I diabetes or the TCF7L2 gene with type 2 diabetes in 361 LADA, 718 type 1 diabetic, and 1,676 type 2 diabetic patients, as well as 1,704 healthy control subjects from Sweden and Finland. RESULTS-LADA subjects showed, compared with type 2 diabetic patients, increased frequency of risk for the HLA-DQB1 *0201/*0302 genotype (27 vs. 6.9%; P < 1 X 10(-6)), with similar frequency as with type I diabetes (36%). In addition, LADA subjects showed higher frequencies of protective HLA-DQB1 *0602(3)/X than type I diabetic patients (8.1 vs. 3.2%, P = 0.003). The AA genotype of rs689, referring to the class I allele in the INS VNTR, as well as the CT/TT genotypes of rs2476601 in the PTPN22 gene, were increased both in type 1 diabetic (P = 3 X 10(-14) and P = 1 X 10(-10), respectively) and LADA (P = 0.001 and P = 0.002) subjects compared with control subjects. Notably, the frequency of the type 2 diabetes-associated CT/TT genotypes of rs7903146 in the TCF7L2 were increased in LADA subjects (52.8%; P = 0.03), to the same extent as in type 2 diabetic subjects (54.1%, P = 3 X 10(-7)), compared with control subjects (44.8%) and type I diabetic subjects (43.39%). CONCLUSIONS-LADA shares genetic features with both type I (HLA, INS VNTR, and PTPN22) and type 2 (TCF7L2) diabetes, which justifies considering LADA as an admixture of the two major types of diabetes.
6.
  • Orho-Melander, Marju, et al. (författare)
  • Common Missense Variant in the Glucokinase Regulatory Protein Gene Is Associated With Increased Plasma Triglyceride and C-Reactive Protein but Lower Fasting Glucose Concentrations
  • 2008
  • Ingår i: DIABETES. - AMER DIABETES ASSOC. - 0012-1797. ; 57:11, s. 3112-3121
  • Tidskriftsartikel (refereegranskat)abstract
    • OBJECTIVE-Using the genome-wide association approach, we recently identified the glucokinase regulatory protein gene (GCKR, rs780094) region as a novel quantitative trait locus for plasma triglyceride concentration in Europeans. Here, we sought to study the association of GCKR variants with metabolic phenotypes, including measures of glucose homeostasis, to evaluate the GCYR locus in samples of non-European ancestry and to fine-map across the associated genomic interval. RESEARCH DESIGN AND METHODS-We performed association studies in 12 independent cohorts comprising >45,000 individuals representing several ancestral groups (whites from Northern and Southern Europe, whites from the U.S., African Americans from the U.S., Hispanics of Caribbean origin, and Chinese, Malays, and Asian Indians from Singapore). We conducted genetic fine-mapping across the similar to 417-kb region of linkage disequilibrium. spanning GCKR and 16 other genes on chromosome 2p23 by imputing untyped HapMap single nucleotide polymorphisms (SNPs) and genotyping 104 SNPs across the associated genomic interval. RESULTS-We provide comprehensive evidence that GCYR rs780094 is associated with opposite effects on fasting plasma triglyceride (P-meta = 3 x 10(-56)) and glucose (P-meta = 1 x 10(-13)) concentrations. In addition, we confirmed recent reports that the same SNP is associated with C-reactive protein (CRP) level (P = 5 x 10(-5)). Both fine-mapping approaches revealed a common missense GCKR variant (rs1260326, Pro446Leu, 34% frequency, r(2) = 0.93 with rs780094) as the strongest association signal in the region. CONCLUSIONS-These findings point to a molecular mechanism in humans by which higher triglycerides and CRP can be coupled with lower plasma glucose concentrations and position GCKR in central pathways regulating both hepatic triglyceride and glucose metabolism. Diabetes 57:3112-3121, 2008
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