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  • 1
    Keywords: CELLS ; EXPRESSION ; CELL ; COMBINATION ; Germany ; human ; COHORT ; POPULATION ; RISK ; GENE ; PROTEIN ; SAMPLE ; SAMPLES ; DNA ; BINDING ; ASSOCIATION ; polymorphism ; POLYMORPHISMS ; single nucleotide polymorphism ; VARIANTS ; HUMANS ; ASSAY ; PROMOTER ; SNP ; OBESITY ; SINGLE ; VARIANT ; SINGLE NUCLEOTIDE POLYMORPHISMS ; FUNCTIONAL-CHARACTERIZATION ; HAPLOTYPES ; INSULIN-RESISTANCE ; metabolic syndrome ; USA ; REPLACEMENT ; Adiponectin ; STATE ; Luciferase reporter ; PLASMA ADIPONECTIN ; TYPE-2 DIABETIC-PATIENTS ; APM1 GENE ; HYPOADIPONECTINEMIA
    Abstract: OBJECTIVE-Adiponectin (APM1, ACDC) is an adipocyte-derived protein with downregulated expression in obesity and insulin-resistant states. Several potentially regulatory single nucleotide polymorphisms (SNPs) within the APM1 gene promoter region have been associated with circulating adiponectin levels. None of them have been functionally characterized in adiponectin-expressing cells. Hence, we investigated three SNPs (rs16861194, rs17300539, and rs266729) for their influence on adiponectin promoter activity and their association with circulating adiponectin levels. RESEARCH DESIGN AND METHODS-Basal and rosiglitazone-induced promoter activity of different SNP combinations (haplotypes) was analyzed in 3T3-L1 adipocytes using luciferase reporter gene assays and DNA binding studies comparing all possible APM1 haplotypes. This functional approach was complemented with analysis of epidemiological population-based data of 1,692 participants of the MONICA/KORA S123 cohort and 696 participants from the KORA S4 cohort for SNP and haplotype association with circulating adiponectin levels. RESULTS-Major to minor allele replacements of the three SNPs revealed significant effects on promoter activity in luciferase assays. Particularly, a minor variant in rs16861194 resulted in reduced basal and rosiglitazone-induced promoter activity and hypoadiponectinemia in the epidemiological datasets. The haplotype with the minor allele in all three SNPs showed a complete loss of promoter activity, and no subject carried this haplotype in either of the epidemiological samples (combined P value for statistically significant difference from a random sample was 0.006). CONCLUSIONS-Our results clearly demonstrate that promoter variants associated with hypoadiponectinemia in humans substantially affect adiponectin promoter activity in adipocytes. Our combination of functional experiments with epidemiological data overcomes the drawback of each approach alone. Diabetes 58-984-991, 2009
    Type of Publication: Journal article published
    PubMed ID: 19074982
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  • 2
    Keywords: PATHWAY ; PATHWAYS ; DISEASE ; RISK ; PROTEIN ; ASSOCIATION ; VARIANTS ; DESIGN ; genetics ; meta-analysis ; inflammation ; interaction ; CORONARY-HEART-DISEASE ; METAANALYSIS ; metabolic syndrome ; myocardial infarction ; COMMON VARIANTS ; ALPHA-GENE ; CRP GENE ; EPIDEMIOLOGIC APPLICATIONS ; FRAMINGHAM ; GENETICALLY ISOLATED POPULATION ; genome-wide association study ; NETHERLANDS TWIN REGISTER
    Abstract: Background-C-reactive protein (CRP) is a heritable marker of chronic inflammation that is strongly associated with cardiovascular disease. We sought to identify genetic variants that are associated with CRP levels. Methods and Results-We performed a genome-wide association analysis of CRP in 66 185 participants from 15 population-based studies. We sought replication for the genome-wide significant and suggestive loci in a replication panel comprising 16 540 individuals from 10 independent studies. We found 18 genome-wide significant loci, and we provided evidence of replication for 8 of them. Our results confirm 7 previously known loci and introduce 11 novel loci that are implicated in pathways related to the metabolic syndrome (APOC1, HNF1A, LEPR, GCKR, HNF4A, and PTPN2) or the immune system (CRP, IL6R, NLRP3, IL1F10, and IRF1) or that reside in regions previously not known to play a role in chronic inflammation (PPP1R3B, SALL1, PABPC4, ASCL1, RORA, and BCL7B). We found a significant interaction of body mass index with LEPR (P 〈 2.9 x 10(-6)). A weighted genetic risk score that was developed to summarize the effect of risk alleles was strongly associated with CRP levels and explained approximate to 5% of the trait variance; however, there was no evidence for these genetic variants explaining the association of CRP with coronary heart disease. Conclusions-We identified 18 loci that were associated with CRP levels. Our study highlights immune response and metabolic regulatory pathways involved in the regulation of chronic inflammation.
    Type of Publication: Journal article published
    PubMed ID: 21300955
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