Polymorphisms in the thymidylate synthase and methylenetetrahydrofolate reductase genes and sensitivity to the low-dose methotrexate therapy in patients with rheumatoid arthritis.

Abstract excerpt

Methotrexate (MTX), widely used in the treatment of rheumatoid arthritis (RA), inhibits dihydrofolate reductase (DHFR) and folate-dependent enzymes. Thymidylate synthase (TS) and methylenetetrahydrofolate reductase (MTHFR) are key enzymes in the folate metabolism and both have been shown to be polymorphic affecting the enzyme activity. To clarify the association between these genetic variations and MTX-related...

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