OBJECTIVE: To investigate the distribution of the A2756G polymorphism of the methionine synthase reductase (MTR) gene in patients with rheumatoid arthritis (RA) treated with methotrexate (MTX) compared with a healthy control group; and to examine the relationships among the A2756G polymorphism, plasma total homocysteine (tHcy), serum folate and vitamin B12 levels, disease activity, and MTX toxicity in patients with RA. METHODS: A cross-sectional study was performed on 86 MTX-treated RA patients, consisting of a clinical interview and physical examination to determine disease activity and MTX-related adverse reactions. Genotype analysis of the MTR gene was performed. Fasting plasma tHcy, serum folate, and vitamin B12 levels were measured. Allele and genotype distributions were compared to a healthy control group. RESULTS: The frequency of the 2756GG genotype (16.3%) in the RA study group was higher than that expected in the general population (3.6%; p < 0.000001). This genotype was associated with MTX-induced accelerated rheumatoid nodulosis (MIARN). No association of disease activity variables or plasma homocysteine with MTR A2756G polymorphisms was observed. The MTR 2756GG genotype, low plasma vitamin B12 levels, and the presence of rheumatoid nodules predicted MIARN. No association of nodulosis with any other indicator of disease activity or medical treatment was found. CONCLUSION: In our population of MTX-treated RA patients the 2756GG genotype of the MTR gene was more common than expected and was associated with MIARN.
OBJECTIVE: To investigate the distribution of the A2756G polymorphism of the methionine synthase reductase (MTR) gene in patients with rheumatoid arthritis (RA) treated with methotrexate (MTX) compared with a healthy control group; and to examine the relationships among the A2756G polymorphism, plasma total homocysteine (tHcy), serum folate and vitamin B12 levels, disease activity, and MTXtoxicity in patients with RA. METHODS: A cross-sectional study was performed on 86 MTX-treated RApatients, consisting of a clinical interview and physical examination to determine disease activity and MTX-related adverse reactions. Genotype analysis of the MTR gene was performed. Fasting plasma tHcy, serum folate, and vitamin B12 levels were measured. Allele and genotype distributions were compared to a healthy control group. RESULTS: The frequency of the 2756GG genotype (16.3%) in the RA study group was higher than that expected in the general population (3.6%; p < 0.000001). This genotype was associated with MTX-induced accelerated rheumatoid nodulosis (MIARN). No association of disease activity variables or plasma homocysteine with MTRA2756G polymorphisms was observed. The MTR 2756GG genotype, low plasma vitamin B12 levels, and the presence of rheumatoid nodules predicted MIARN. No association of nodulosis with any other indicator of disease activity or medical treatment was found. CONCLUSION: In our population of MTX-treated RApatients the 2756GG genotype of the MTR gene was more common than expected and was associated with MIARN.
Authors: Torben S Mikkelsen; Caroline F Thorn; Jun J Yang; Cornelia M Ulrich; Deborah French; Gianluigi Zaza; Henry M Dunnenberger; Sharon Marsh; Howard L McLeod; Kathy Giacomini; Mara L Becker; Roger Gaedigk; James Steven Leeder; Leo Kager; Mary V Relling; William Evans; Teri E Klein; Russ B Altman Journal: Pharmacogenet Genomics Date: 2011-10 Impact factor: 2.089
Authors: Liang Wang; Shannon K McDonnell; Scott J Hebbring; Julie M Cunningham; Jennifer St Sauver; James R Cerhan; Grazia Isaya; Daniel J Schaid; Stephen N Thibodeau Journal: Cancer Epidemiol Biomarkers Prev Date: 2008-12 Impact factor: 4.254
Authors: Rossella Talotta; Fabiola Atzeni; Alberto Batticciotto; Maria Chiara Ditto; Maria Chiara Gerardi; Piercarlo Sarzi-Puttini Journal: J Med Case Rep Date: 2018-06-03