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  • Title: Prevalence and significance of MEFV gene mutations in patients with sarcoidosis.
    Author: Sever F, Kobak S, Goksel Ö, Goksel T, Orman M, Berdeli A.
    Journal: Scand J Rheumatol; 2016; 45(3):215-8. PubMed ID: 27053370.
    Abstract:
    OBJECTIVES: Sarcoidosis is a chronic granulomatous disease. Pyrin has anti-inflammatory activity in the regulation of inflammasomes and is encoded by the Mediterranean fever (MEFV) gene. MEFV gene mutations trigger the inflammatory cascade and cause familial Mediterranean fever (FMF). A relationship between various rheumatic diseases and MEFV gene mutations has been demonstrated. The aim of this study was to determine the prevalence of the MEFV gene mutation in Turkish patients with sarcoidosis and to detect any possible correlation with disease phenotype. METHOD: The study included 78 sarcoidosis patients and 85 healthy subjects matched for age, gender, and ethnicity. MEFV gene mutations were investigated with the FMF strip assay, which is based on reverse hybridization of biotinylated polymerase chain reaction (PCR) products. RESULTS: Of the 78 patients with sarcoidosis, nine (11.5%) were found to be carriers of MEFV gene mutations. The distribution of these nine mutations were: three (3.8%) V726A, two (2.5%) E148Q, two (2.5%) M680I, one (1.3%) A744S, and one (1.3%) K695R. Carriers of M694V, M694I, R761H, and P369S were not detected in any of the sarcoidosis patients. None of the sarcoidosis patients were found to be compound heterozygous carriers. The prevalence of the MEFV gene mutation carrier detected in the healthy control group was 22.4%. The distribution of the 19 MEFV gene mutations found in the healthy controls was: nine (10.6%) E148Q, two (2.3%) M694V, one (1.2%) M694I, one (1.2%) M680I, two (2.3%) V726A, one (1.2%) A744S, two (2.3%) K695R, and one (1.2%) P369S. When compared with the control group, a lower prevalence of the MEFV gene mutation carrier was found in sarcoidosis patients but this was not statistically significant (p = 0.067). In nine patients found to be MEFV gene mutation carriers, higher serum erythrocyte sedimentation rate (ESR) and C-reactive protein (CRP) levels and higher numbers patients with arthritis, enthesitis, and ankle arthritis were found (p = 0.01, p = 0.04, p = 0.028, p = 0.05, p = 0.05, respectively). CONCLUSIONS: When we compared Turkish sarcoidosis patients with the healthy control group, we found a lower prevalence of MEFV gene mutations. In sarcoidosis patients, the MEFV gene mutation carrier was found to be related to high acute-phase responses, arthritis, and enthesitis. The existence of MEFV gene mutations may have a preventive role with regard to the development of sarcoidosis. Prospective studies that include larger patient populations are needed.
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