1. IL1β , IL18 , NFKB1 and IFNG gene interactions are associated with severity of rheumatoid arthritis: A pilot study.
- Author
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Gomes da Silva IIF, Lima CAD, Monteiro MLA, Barboza DASP, Rushansky E, Mariano MHQA, Sandrin-Garcia P, de Souza PRE, and Maia MMD
- Subjects
- Adult, Alleles, Amplified Fragment Length Polymorphism Analysis, Arthritis, Rheumatoid complications, Arthritis, Rheumatoid genetics, Arthritis, Rheumatoid immunology, Biomarkers analysis, Case-Control Studies, Disability Evaluation, Female, Gene Frequency, Healthy Volunteers, Humans, Interferon-gamma genetics, Interleukin-18 genetics, Interleukin-1beta genetics, Male, Middle Aged, NF-kappa B p50 Subunit genetics, Pilot Projects, Polymorphism, Restriction Fragment Length, Polymorphism, Single Nucleotide, Protective Factors, Risk Factors, Arthritis, Rheumatoid diagnosis, Genetic Predisposition to Disease, Severity of Illness Index
- Abstract
Rheumatoid arthritis (RA) is an autoimmune disease which can lead to progressive and functional disability. Literature data suggest that some inflammatory proteins are dysregulated in RA patients and its genetic polymorphisms may contribute to the aetiology and pathogenesis of disease in different ethnic groups. Polymorphisms in IL1β, IL18, NFKB1 and IFNG genes were studied in different populations with RA, but the analysis indicated contradictory results. Thereby, we hypothesised that polymorphisms in these genes could have a combined effect on susceptibility to and severity of disease. We evaluated the +3953 C/T IL1β (rs1143634), -137 G/C IL18 (rs187238), -94 ins/del ATTG NFKB1 (rs28362491) and +874 T/A IFNG (rs2430561) polymorphisms in the northeastern Brazilian population. Peripheral blood samples were collected and DNA extraction was conducted. The polymorphisms were evaluated by RFLP and ARMS-PCR. An association was observed in rs1143634 which showed a protective effect against development of RA in carriers of the T allele (OR = 0.58; 95% CI 0.36-0.92; p = .020). In addition, we found an association among genotypes of the rs1143634 with the HAQ index ( p = .021) and rs2430561 with DAS28 ( p = .029) and CDAI ( p = .029). In relation to combined effects of these SNPs (C/C to rs1143634, G/G to rs187238, I/I to rs28362491 and AA to rs2430561) we found a significant association with decreased functional disability (HAQ index p < .001) and ESR ( p = .034), indicating a lower disease activity in carriers of these genotypes. GLM analysis confirmed these associations (HAQ ( F = 5.497; p < .001) and ESR ( F = 2.727; p = .032)). Our analysis indicated that in the studied population +3953 C/T IL-1β (rs1143634), -137 G/C IL-18 (rs187238), -94 ins/del ATTG NFKB1 (rs28362491) and +874 T/A IFNG (rs2430561) polymorphisms can together contribute to RA severity although they do not individually influence the disease.
- Published
- 2020
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