Association between the -308 and -238 polymorphisms of the TNF-α gene and rheumatoid arthritis (preliminary data).

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Carlos Mestanza
Camilo Zurita Salinas
Estefanía Espín
David Ortega Paredes
Marcelo Mora
Carlos Vallejo
Rómulo Villacís
Marilú Mestanza Peralta

Abstract

Rheumatoid Arthritis (RA) is a systemic inflammatory disease that affects 0.5 to 2 % of the global population. In Ecuador the reported prevalence of the disease is 0.9 %. Recently, an increase number of polymorphisms have been studied in order to find a relationship between the disease and genetic polymorphisms. Two of the most studied polymorphisms are -308 and -238 of the tumor necrosis factor α (TNF-α) gene. Forty individuals with previous diagnosis of RA and twenty five healthy individualswere analyzed for the presence of the polymorphisms -238 and -308 using RT-PCR (endpoint genotyping). Additionally, levels of RA markers were assessed using ELISA. Disease activity was measured according to clinical data using DAS 28. The study was carried out according to Helsinki declaration standards. No differences were found in genotype frequencies between healthy and RA individuals in both polymorphisms. Results showed that most -238GA individuals (69 %) had low disease activity according to DAS28 (SB DAS28); in contrast to -238GG and -238AA polymorphisms in which most individuals (67 % and 57 %) had medium disease level (SM DAS 28.This is the first study on relationship between RA and genetic polymorphisms carried out in Ecuador. Our results suggest the association between 238GG polymorphism and a higher progression of the disease, reported previously.

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1.
Mestanza C, Zurita Salinas C, Espín E, Ortega Paredes D, Mora M, Vallejo C, Villacís R, Mestanza Peralta M. Association between the -308 and -238 polymorphisms of the TNF-α gene and rheumatoid arthritis (preliminary data). REMCB [Internet]. 2017Aug.14 [cited 2024Jul.3];34(1-2):205-14. Available from: https://remcb-puce.edu.ec/remcb/article/view/244
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Artículos Científicos

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