Thromb Haemost 1997; 77(05): 0818-0821
DOI: 10.1055/s-0038-1656059
Cinical Studies
Schattauer GmbH Stuttgart

The Mutation Ala677→Val in the Methylene Tetrahydrofolate Reductase Gene: A Risk Factor for Arterial Disease and Venous Thrombosis

Valder R Arruda
The Hematology-Hemotherapy Center, Department of Clinical Medicine, State University of Campinas, Campinas, São Paulo, Brazil
,
Paula M von Zuben
The Hematology-Hemotherapy Center, Department of Clinical Medicine, State University of Campinas, Campinas, São Paulo, Brazil
,
Luiz C Chiaparini
The Hematology-Hemotherapy Center, Department of Clinical Medicine, State University of Campinas, Campinas, São Paulo, Brazil
,
Joyce M Annichino-Bizzacchi
The Hematology-Hemotherapy Center, Department of Clinical Medicine, State University of Campinas, Campinas, São Paulo, Brazil
,
Fernando F Costa
The Hematology-Hemotherapy Center, Department of Clinical Medicine, State University of Campinas, Campinas, São Paulo, Brazil
› Author Affiliations
Further Information

Publication History

Received 15 October 1996

Accepted after revision 20 January 1997

Publication Date:
11 July 2018 (online)

Summary

Mild hyperhomocysteinemia has been identified as a risk factor for arterial disease and for venous thrombosis. Individuals homozygous for the thermolabile variant of the methylene tetrahydrofolate reductase gene (MTHFR) which results from a common mutation Ala677→Val and is found in 5-15% of the general population, have significantly elevated plasma homocysteine levels and may account for one of the genetic risk factors in vascular disease. We have analyzed the prevalence of MTHFR-T homozygotes in patients with arterial disease or venous thrombosis. We studied 191 patients with arterial disease and 127 individuals with venous thrombosis and compared with 296 unmatched controls. The results showed that there was a high prevalence of homozygotes for the mutated MTHFR-T allele among a group of patients with arterial disease (19%) in the absence of hyperlipoproteinemia, hypertension, and diabetes mellitus when compared to controls (4%), odds ratio of 5.52 (95% C.I., 2.27 to 13.51). The prevalence of homozygotes among patients with venous thrombosis was 11%, odds ratio of 2.93 (95% C.I., 1.23 to 7.01). The risk of venous thrombosis remained high, odds ratio of 2.63, even after we excluded 27 patients with hereditary thrombophilia (e.g. factor V Leiden, dysfibrinogene- mia, deficiency of protein C, protein S, antithrombin III, or factor XII) from the 127 overall cases with venous thrombosis. These data support the hypothesis that being a homozygote for the MTHFR-T is a risk factor for the development of arterial diasease and also for venous thrombosis.

 
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