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(Circulation. 1996;93:7-9.)
© 1996 American Heart Association, Inc.


Articles

Relation Between Folate Status, a Common Mutation in Methylenetetrahydrofolate Reductase, and Plasma Homocysteine Concentrations

Paul F. Jacques, ScD; Andrew G. Bostom, MD, MS; Roger R. Williams, MD; R. Curtis Ellison, MD, MS; John H. Eckfeldt, MD, PhD; Irwin H. Rosenberg, MD; Jacob Selhub, PhD; Rima Rozen, PhD

From the Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University, Boston, Mass (P.F.J., A.G.B., I.H.R., J.S.); the NHLBI Family Heart Study, University of Utah Cardiovascular Genetics Research Clinic, Salt Lake City (R.R.W.); the NHLBI Family Heart Study, Framingham, Mass, and Boston (Mass) University School of Medicine (R.C.E.); the NHLBI Family Heart Study Central Laboratory, Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis (J.H.E.); and the Departments of Human Genetics, Pediatrics, and Biology, McGill University, Montreal (Quebec) Children's Hospital (R.R.).

Correspondence to Rima Rozen, Montreal Children's Hospital, 2300 Tupper St, Montreal, Quebec, Canada H3H 1P3.

Background Methylenetetrahydrofolate reductase (MTHFR) synthesizes 5-methyltetrahydrofolate, the major carbon donor in remethylation of homocysteine to methionine. A common MTHFR mutation, an alanine-to-valine substitution, renders the enzyme thermolabile and may cause elevated plasma levels of the amino acid homocysteine.

Methods and Results To assess the potential interaction between this mutation and vitamin coenzymes in homocysteine metabolism, we screened 365 individuals from the NHLBI Family Heart Study. Among individuals with lower plasma folate concentrations (<15.4 nmol/L), those with the homozygous mutant genotype had total fasting homocysteine levels that were 24% greater (P<.05) than individuals with the normal genotype. A difference between genotypes was not seen among individuals with folate levels >=15.4 nmol/L.

Conclusions Individuals with thermolabile MTHFR may have a higher folate requirement for regulation of plasma homocysteine concentrations; folate supplementation may be necessary to prevent fasting hyperhomocysteinemia in such persons.


Key Words: enzymes • homocysteine • amino acids • metabolism • genetics




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