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Updated: Jun 25, 2026

An Adoptive Transfer Model of Rheumatoid Arthritis in Mice
Published on: June 6, 2025
The effect of exon (19C>A) dihydroorotate dehydrogenase gene polymorphism on rheumatoid arthritis treatment with
Andrzej Pawlik1, Magdalena Herczynska, Mateusz Kurzawski
1Department of Pharmacology, Pomeranian Medical University, ul. Powst. Wlkp. 72, 70111 Szczecin, Poland. pawand@poczta.onet.pl
Objective:
Leflunomide is an isoxazole derivative structurally and functionally unrelated to other known immunomodulatory drugs. The main molecular target of leflunomide is dihydroorotate dehydrogenase (DHODH), a key enzyme of de novo pyrimidine synthesis. The human DHODH gene sequence is highly conserved and contains only one common missense polymorphism in the coding regions. This SNP (refSNP ID: rs3213422) is localized in the first exon of the DHODH gene (19C>A) and leads to Gln7Lys amino acid substitution in the cationic N-terminal region of the DHODH polypeptide, and it has not yet been investigated in relation to enzyme activity or DHODH inhibitor efficacy. The aim of the study was to examine the effect of this polymorphism on leflunomide treatment outcome in rheumatoid arthritis (RA) patients.
Materials & Methods:
The study was carried out on 147 patients (123 women, 24 men, mean age: 52.8 +/- 11.03 years) diagnosed with RA and treated with leflunomide 20 mg daily. Clinical improvement was evaluated according to the American College of Rheumatology 20% and 50% response criteria.
Results:
The frequency of remission was increased in C allele carriers compared with patients with the A allele.
Conclusion:
The results of this study suggest that DHODH polymorphism may be associated with leflunomide treatment outcome in RA patients.
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Translation
Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
Translation Produces the Building Blocks of Life
Genome-wide Association Studies-GWAS
GWAS does not require the identification of the target gene involved in...
