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. 2017 Nov;21(11):698-704.
doi: 10.1089/gtmb.2017.0124. Epub 2017 Oct 10.

MTRR A66G, RFC1 G80A, and MTHFR C677T and A1298C Polymorphisms and Disease Activity in Mexicans with Rheumatoid Arthritis Treated with Methotrexate

Mirna Gisel González-Mercado  1   2   3 , Fernando Rivas  4 , M Patricia Gallegos-Arreola  1 , M Cristina Morán-Moguel  1   3 , Mario Salazar-Páramo  5   6 , Laura González-López  5   6 , J Iván Gámez-Nava  5   6 , J Francisco Muñoz-Valle  3 , Ricardo Medina-Coss Y León  1 , Anahí González-Mercado  1   3 , Mario A Aceves  5   6 , Nory O Dávalos  3 , Agustín Macías-Chumacera  6 , Ingrid P Dávalos  1   3
Affiliations

MTRR A66G, RFC1 G80A, and MTHFR C677T and A1298C Polymorphisms and Disease Activity in Mexicans with Rheumatoid Arthritis Treated with Methotrexate

Mirna Gisel González-Mercado et al. Genet Test Mol Biomarkers. 2017 Nov.

Abstract

Aim: To investigate the relationships of polymorphisms in genes whose protein products are related in the metabolic pathway of folic acid, particularly MTRR A66G, RFC1 G80A, and MTHFR C677T and A1298C, and disease activity in Mexican patients with rheumatoid arthritis (RA) treated with methotrexate (MTX).

Materials and methods: Sixty-eight patients with RA were included in the study who were being treated with MTX, either with or without other drugs. In addition to general data, disease activity was measured by the disease activity score 28 (DAS28). Single nucleotide polymorphisms (SNPs) genotyping was performed by allelic discrimination using real-time polymerase chain reaction.

Results: Differences in genotype (homozygotic or heterozygotic for each allele), allele distributions, and phenotype were not statistically different between the RA group and control populations. We did not find any association between the studied polymorphisms and disease activity nor with the intragroup variables (e.g., clinical activity, body mass index, and single- or combined-drug treatment) or between genetic markers; we also did not find any association within the RA group or between the RA group and control populations.

Conclusion: Additional studies of more polymorphisms related to this or other metabolic pathways are required to determine the influence of genetics on disease activity in RA.

Keywords: DAS28; MTHFR; MTRR; RFC1; methotrexate; rheumatoid arthritis.

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Conflict of interest statement

No competing financial interests exist.

Figures

<b>FIG. 1.</b>
FIG. 1.
Comparison between DAS28 mean values and the genotypes of each polymorphism in patients with RA treated with MTX. A slight upward trend in disease activity was observed in genotypes 2/2 of polymorphisms (MTRR A66G p = 0.73, RFC1 G80A p = 0.55, MTHFR A1298C p = 0.48) with the exception of MTHFR C677T (p = 0.58); however, it was not statistically significant. DAS28, disease activity score 28; RA, rheumatoid arthritis.
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