Jornal Vascular Brasileiro
https://www.jvascbras.org/article/doi/10.1590/1677-5449.202200612
Jornal Vascular Brasileiro
Original Article

MTHFR 677C>T (rsRS1801133) variant is associated with hyperhomocysteinemia but not with clinical severity in patients with peripheral arterial disease

A variante MTHFR 677C>T (RS1801133) está associada a hiperhomocisteinemia, mas não a gravidade clínica em pacientes com doença arterial periférica

Guilherme da Silva Silvestre; Iriana Moratto Carrara; Tamires Flauzino; Marcell Alysson Batisti Lozovoy; Rubens Cecchini; Edna Maria Vissoci Reiche; Andréa Name Colado Simão

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Abstract

Background: The MTHFR 677C>T variant’s involvement with hyperhomocysteinemia and peripheral arterial disease (PAD) is still unclear.

Objectives: To evaluate associations between the MTHFR 677C>T (rs1801133) variant and susceptibility to and severity of PAD and homocysteine (Hcy) levels.

Methods: The study enrolled 157 PAD patients and 113 unrelated controls. PAD severity and anatomoradiological categories were assessed using the Fontaine classification and the Inter-Society Consensus for the Management of Peripheral Arterial Disease (TASC), respectively. The variant was genotyped using real-time polymerase chain reaction and Hcy levels were determined using chemiluminescence microparticle assay.

Results: The sample of PAD patients comprised 60 (38.2%) females and 97 (61.8%) males. Patients were older and had higher Hcy than controls (median age of 69 vs. 45 years, p<0.001; and 13.66 µmol/L vs. 9.91 µmol/L, p=0.020, respectively). Hcy levels and the MTHFR 677C>T variant did not differ according to Fontaine or TASC categories. However, Hcy was higher in patients with the CT+TT genotypes than in those with the CC genotype (14.60 µmol/L vs. 12.94 µmol/L, p=0.008). Moreover, patients with the TT genotype had higher Hcy than those with the CC+CT genotypes (16.40 µmol/L vs. 13.22 µmol/L, p=0.019), independently of the major confounding variables.

Conclusions: The T allele of MTHFR 677C>T variant was associated with higher Hcy levels in PAD patients, but not in controls, suggesting a possible interaction between the MTHFR 677C>T variant and other genetic, epigenetic, or environmental factors associated with PAD, affecting modulation of Hcy metabolism.

Keywords

peripheral arterial disease, methylenetetrahydrofolate reductase, homocysteine, genetic variant, Fontaine classification

Resumo

Contexto: O envolvimento da variante MTHFR 677C>T na hiperhomocisteinemia e na doença arterial periférica (DAP) ainda não está claro.

Objetivos: Avaliar a associação da variante MTHFR 677C>T (rs1801133) com suscetibilidade e gravidade da DAP e valores séricos de homocisteína (Hcy).

Métodos: Este estudo caso-controle envolveu 157 pacientes com DAP e 113 controles não relacionados. A gravidade e as categorias anatomorradiológicas da DAP foram avaliadas pela classificação de Fontaine e pelo Inter-Society Consensus for the Management of Peripheral Arterial Disease, respectivamente. A genotipagem foi realizada por meio de reação em cadeia da polimerase em tempo real, e os valores de Hcy foram determinados por ensaio de micropartículas de quimioluminescência.

Resultados: Entre os pacientes com DAP, 97 (61,8%) eram homens e 60 (38,2%) eram mulheres, com mediana de idade de 69 anos. Os pacientes com DAP eram mais velhos e apresentaram valores mais elevados de Hcy do que os controles (mediana de 69 vs. 45 anos de idade, p < 0,001; 13,66 µmol/L vs. 9,91 µmol/L, p = 0,020, respectivamente). Os valores de Hcy foram mais elevados em pacientes com os genótipos CT+TT do que aqueles com o genótipo CC (14,60 µmol/L vs. 12,94 µmol/L, p = 0,008). Além disso, os pacientes com o genótipo TT apresentaram valores mais elevados de Hcy do que aqueles com os genótipos CC+CT (16,40 µmol/L vs. 13,22 µmol/L, p = 0,019, respectivamente), independentemente das principais variáveis confundidoras.

Conclusões: O alelo T da variante MTHFR 677C>T foi associado a valores mais elevados de Hcy nos pacientes com DAP, mas não em controles, sugerindo uma possível interação entre a variante genética MTHFR 677C>T e outros fatores genéticos, epigenéticos ou ambientais associados com a DAP na modulação do metabolismo da Hcy.
 

Palavras-chave

doença arterial periférica, metilenotetrahidrofolato redutase, homocisteína, variante genética, classificação de Fontaine

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Submitted date:
07/06/2022

Accepted date:
05/18/2023

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