Thromb Haemost 1998; 79(02): 254-258
DOI: 10.1055/s-0037-1614974
Letters to the Editor
Schattauer GmbH

Thermolabile Methylenetetrahydrofolate Reductase and Factor V Leiden in the Risk of Deep-Vein Thrombosis

Leo A. J. Kluijtmans
1   From the Department of Pediatrics, University Hospital Nijmegen, The Netherlands
,
Martin den Heijer
2   From the Department of International Medicine, Twee Steden Hospital, Tilburg, The Netherlands
,
Pieter H. Reitsma
3   From the Department of Hemostasis and Thrombosis, University Hospital Leiden, The Netherlands
,
Sandra G. Heil
1   From the Department of Pediatrics, University Hospital Nijmegen, The Netherlands
,
Henk J. Blom
1   From the Department of Pediatrics, University Hospital Nijmegen, The Netherlands
,
Frits R. Rosendaal
3   From the Department of Hemostasis and Thrombosis, University Hospital Leiden, The Netherlands
4   From the Department of Clinical Epidemiology, University Hospital Leiden, The Netherlands
› Institutsangaben
This study was in part supported by grant 93.176 from The Netherlands Heart Foundation.
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Publikationsverlauf

Received 23. Juni 1997

Accepted after resubmission 24. September 1997

Publikationsdatum:
08. Dezember 2017 (online)

Summary

Mild hyperhomocysteinemia is an established risk factor for both arteriosclerosis and thrombosis, and may be caused by genetic and environmental factors. Methylenetetrahydrofolate reductase (MTHFR) catalyzes the reduction of 5,10-methylenetetrahydrofolate to 5-methyltetrahydrofolate, the cofactor for the methylation of homocysteine to methionine. Individuals with the thermolabile variant of MTHFR have decreased MTHFR activities, resulting in elevated plasma homocysteine concentrations. A homozygous 677C→T transition in the MTHFR gene has recently been identified as the cause of reduced enzyme activity and thermolability of the protein. We studied the frequency of the homozygous mutant (+/+) genotype in 471 patients with deep-vein thrombosis and 474 healthy controls enrolled in The Leiden Thrombophilia Study (LETS), its interaction with factor V Leiden, and assessed the association between the MTHFR genotypes and plasma homocysteine concentration. Homozygosity for the 677C→T polymorphism was observed in 47 (10%) patients, and in 47 (9.9%) controls (OR 1.01 [95% CI: 0.7-1.5]). No modified risk of the (+/+) genotype was observed in carriers of factor V Leiden. Our data suggest that, although the homozygous mutant genotype is associated with elevated plasma homocysteine concentrations, this homozygous mutation itself is not a genetic risk factor for deep-vein thrombosis, irrespective of factor V Leiden genotype.

 
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