Disease association of two distinct interleukin-18 promoter polymorphisms in Caucasian rheumatoid arthritis patients

Interleukin (IL)-18 is an important mediator of innate and adaptive immunity. We searched for an association of IL-18 promoter single-nucleotide polymorphisms (SNP) with rheumatoid arthritis (RA) in Caucasians. The entire study population was composed of two independent cohorts from Germany ( n =200...

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Veröffentlicht in:Genes and immunity 2005-05, Vol.6 (3), p.211-216
Hauptverfasser: Gracie, J A, Koyama, N, Murdoch, J, Field, M, McGarry, F, Crilly, A, Schobel, A, Madhok, R, Pons-Kühnemann, J, McInnes, I B, Möller, B
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container_title Genes and immunity
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creator Gracie, J A
Koyama, N
Murdoch, J
Field, M
McGarry, F
Crilly, A
Schobel, A
Madhok, R
Pons-Kühnemann, J
McInnes, I B
Möller, B
description Interleukin (IL)-18 is an important mediator of innate and adaptive immunity. We searched for an association of IL-18 promoter single-nucleotide polymorphisms (SNP) with rheumatoid arthritis (RA) in Caucasians. The entire study population was composed of two independent cohorts from Germany ( n =200) and Scotland ( n =410). Presence of IL-18 SNP at positions −607 and −137 was determined by allele-specific PCR in 327 RA patients and 283 healthy donors (HD). Diplotype distributions of both loci were in Hardy–Weinberg equilibrium (HWE) in the German and Scottish HD cohorts. In contrast, locus −607 was in HW disequilibrium in German, and locus −137 in Scottish RA patients. Diplotypic exact χ 2 tests suggested that −607CC was overrepresented in German, and −137CC in Scottish RA patients, but conservative χ 2 trend analyses could not prove any significant disease association of these single loci. SNP −607 and −137 were in strong linkage disequilibrium. The −607C * −137C haplotype was more prevalent in German RA (3.2 vs 1.2%) and in Scottish RA patients (4.1 vs 0.9%) than in the respective HD cohorts. These observations suggest that SNP of both positions contribute to the genetic background of RA pathogenesis.
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We searched for an association of IL-18 promoter single-nucleotide polymorphisms (SNP) with rheumatoid arthritis (RA) in Caucasians. The entire study population was composed of two independent cohorts from Germany ( n =200) and Scotland ( n =410). Presence of IL-18 SNP at positions −607 and −137 was determined by allele-specific PCR in 327 RA patients and 283 healthy donors (HD). Diplotype distributions of both loci were in Hardy–Weinberg equilibrium (HWE) in the German and Scottish HD cohorts. In contrast, locus −607 was in HW disequilibrium in German, and locus −137 in Scottish RA patients. Diplotypic exact χ 2 tests suggested that −607CC was overrepresented in German, and −137CC in Scottish RA patients, but conservative χ 2 trend analyses could not prove any significant disease association of these single loci. SNP −607 and −137 were in strong linkage disequilibrium. The −607C * −137C haplotype was more prevalent in German RA (3.2 vs 1.2%) and in Scottish RA patients (4.1 vs 0.9%) than in the respective HD cohorts. 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We searched for an association of IL-18 promoter single-nucleotide polymorphisms (SNP) with rheumatoid arthritis (RA) in Caucasians. The entire study population was composed of two independent cohorts from Germany ( n =200) and Scotland ( n =410). Presence of IL-18 SNP at positions −607 and −137 was determined by allele-specific PCR in 327 RA patients and 283 healthy donors (HD). Diplotype distributions of both loci were in Hardy–Weinberg equilibrium (HWE) in the German and Scottish HD cohorts. In contrast, locus −607 was in HW disequilibrium in German, and locus −137 in Scottish RA patients. Diplotypic exact χ 2 tests suggested that −607CC was overrepresented in German, and −137CC in Scottish RA patients, but conservative χ 2 trend analyses could not prove any significant disease association of these single loci. SNP −607 and −137 were in strong linkage disequilibrium. The −607C * −137C haplotype was more prevalent in German RA (3.2 vs 1.2%) and in Scottish RA patients (4.1 vs 0.9%) than in the respective HD cohorts. 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We searched for an association of IL-18 promoter single-nucleotide polymorphisms (SNP) with rheumatoid arthritis (RA) in Caucasians. The entire study population was composed of two independent cohorts from Germany ( n =200) and Scotland ( n =410). Presence of IL-18 SNP at positions −607 and −137 was determined by allele-specific PCR in 327 RA patients and 283 healthy donors (HD). Diplotype distributions of both loci were in Hardy–Weinberg equilibrium (HWE) in the German and Scottish HD cohorts. In contrast, locus −607 was in HW disequilibrium in German, and locus −137 in Scottish RA patients. Diplotypic exact χ 2 tests suggested that −607CC was overrepresented in German, and −137CC in Scottish RA patients, but conservative χ 2 trend analyses could not prove any significant disease association of these single loci. SNP −607 and −137 were in strong linkage disequilibrium. The −607C * −137C haplotype was more prevalent in German RA (3.2 vs 1.2%) and in Scottish RA patients (4.1 vs 0.9%) than in the respective HD cohorts. These observations suggest that SNP of both positions contribute to the genetic background of RA pathogenesis.</abstract><cop>London</cop><pub>Nature Publishing Group UK</pub><pmid>15789055</pmid><doi>10.1038/sj.gene.6364183</doi><tpages>6</tpages><oa>free_for_read</oa></addata></record>
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subjects Adaptive immunity
Arthritis, Rheumatoid - genetics
Arthritis, Rheumatoid - metabolism
Biomedical and Life Sciences
Biomedicine
Cancer Research
Care and treatment
Cytokines
Disease
European Continental Ancestry Group
full-paper
Gene Expression
Genes
Genetic aspects
Genetic polymorphisms
Germany
Haplotypes
Human Genetics
Humans
Immunology
Interleukin 18
Interleukin-18 - genetics
Interleukin-18 - metabolism
Interleukins
Linkage disequilibrium
Lymphocytes
Pathogenesis
Physiological aspects
Polymorphism
Polymorphism, Genetic
Population studies
Promoter Regions, Genetic
Rheumatoid arthritis
Risk factors
Scotland
Single-nucleotide polymorphism
Statistical significance
Tumor necrosis factor-TNF
White people
title Disease association of two distinct interleukin-18 promoter polymorphisms in Caucasian rheumatoid arthritis patients
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