title: Genetic variants of homocysteine metabolizing enzymes and the risk of coronary artery disease.
abstract: It is unresolved whether elevated homocysteine in coronary artery disease (CAD) is the cause of arteriosclerosis or its consequence. In contrast, genetic variants of enzymes that metabolize homocysteine cannot be altered by arteriosclerosis. Consequently, their association with CAD would permit to imply causality. We modeled by regression analysis the effect of 11 variants in the methionine cycle upon CAD manifestation in 591 controls and 278 CAD patients. Among the examined variants only the carriership for the c.844ins68 in the cystathionine beta-synthase (CBS) gene was associated with a significantly lowered risk of CAD (OR=0.56; 95% CI=0.35-0.90 in the univariable, and OR=0.41, 95% CI=0.19-0.89 for obese people in the multivariable analysis, respectively). Healthy carriers of the c.844ins68 variant exhibited, compared to the wild type controls, significantly higher postload ratios of blood S-adenosylmethionine to S-adenosylhomocysteine (61.4 vs. 54.9, p=0.001) and of plasma total cysteine to homocysteine (8.6 vs. 7.3, p=0.004). The changes in these metabolites are compatible with an improved methylation status and with enhanced activity of homocysteine transsulfuration. In conclusion, the coincidence of clinical and biochemical effects of a common c.844ins68 CBS variant supports the hypothesis that compounds relating to homocysteine metabolism may play role in the development and/or progression of CAD.
authors.affiliation: Institute of Inherited Metabolic Diseases, Charles University--1st Faculty of Medicine, Prague, Czech Republic.
authors.forename: Bohumila
authors.initials: B
authors.lastname: Janosíková
authors.forename: Markéta
authors.initials: M
authors.lastname: Pavlíková
authors.forename: Dora
authors.initials: D
authors.lastname: Kocmanová
authors.forename: Andrea
authors.initials: A
authors.lastname: Vítová
authors.forename: Kamila
authors.initials: K
authors.lastname: Veselá
authors.forename: Lucie
authors.initials: L
authors.lastname: Krupková
authors.forename: Regina
authors.initials: R
authors.lastname: Kahleová
authors.forename: Jakub
authors.initials: J
authors.lastname: Krijt
authors.forename: Pavel
authors.initials: P
authors.lastname: Kraml
authors.forename: Josef
authors.initials: J
authors.lastname: Hyánek
authors.forename: Jana
authors.initials: J
authors.lastname: Zvárová
authors.forename: Michal
authors.initials: M
authors.lastname: Andel
authors.forename: Viktor
authors.initials: V
authors.lastname: Kozich
mesh_terms: D000704:Analysis of Variance; D003324:Coronary Artery Disease / Q000097:blood / Q000209:etiology* / Q000235:genetics; D003541:Cystathionine beta-Synthase / Q000235:genetics*; D005787:Gene Frequency; D014644:Genetic Variation; D005838:Genotype; D006579:Heterozygote; D006710:Homocysteine / Q000097:blood*; D006801:Humans; D016015:Logistic Models; D008715:Methionine / Q000008:administration & dosage / Q000097:blood; D009154:Mutation; D011110:Polymorphism, Genetic; D012307:Risk Factors
chemical_list: D006710:Homocysteine; D008715:Methionine; D003541:Cystathionine beta-Synthase