title: Effect of MTHFR 1298A-->C and MTHFR 677C-->T genotypes on total homocysteine, folate, and vitamin B(12) plasma concentrations in kdiney graft recipients.
abstract: The effect of 5,10-methylenetetrahydrofolate reductase (MTHFR) 677C-->T and 1298A-->C on total homocysteine (tHcy), folate and vitamin B(12) levels was investigated in 733 kidney graft recipients. The six major genotype combinations were used as grouping variables, and age, gender, BMI, serum creatinine, and creatinine clearance and ln-folate, ln-vitamin B(12), or logarithmus naturalis tHcy (ln-tHcy) were used as covariates in three ANCOVA and multiple stepwise linear regression models. Hyperhomocysteinemia was present in 49.7% of the patients. The allele frequency of MTHFR 677T and 1298C was 0.319 and 0.326. MTHFR genotype and all other variables were significant predictors of ln-tHcy (higher tHcy plasma levels for MTHFR 677TT/1298AA versus all other five genotype groups: P < 0. 05). BMI, creatinine clearance, ln-tHcy, and MTHFR genotype influenced ln-folate (lower folate levels for MTHFR 677TT/1298AA versus all other genotype groups: P < 0.05). Creatinine clearance and ln-tHcy were the only predictors of ln-vitamin B(12) levels. In a prespecified subgroup analysis (n = 496), the MTHFR genotype also influenced tHcy levels and compound heterozygous patients had significantly lower folate levels as compared with MTHFR 677CC/1298AA and 677CC/1298CC. This study shows that the MTHFR 677TT/1298AA and 677CT/1298AC genotypes are significant predictors of tHcy and folate plasma levels.
authors.affiliation: Department of Laboratory Medicine, Division of Molecular Biology, University of Vienna, Austria.
authors.forename: Manuela
authors.initials: M
authors.lastname: Födinger
authors.affiliation: Department of Laboratory Medicine, Division of Molecular Biology, University of Vienna, Austria.
authors.forename: Heidi
authors.initials: H
authors.lastname: Buchmayer
authors.affiliation: Department of Medicine II, Division of Cardiology and Angiology, University of Vienna, Austria.
authors.forename: Gotfried
authors.initials: G
authors.lastname: Heinz
authors.affiliation: Department of Laboratory Medicine, Division of Molecular Biology, University of Vienna, Austria.
authors.forename: Menelaos
authors.initials: M
authors.lastname: Papagiannopoulos
authors.affiliation: Department of Medicine III, Division of Nephrology and Dialysis, University of Vienna, Austria.
authors.forename: Josef
authors.initials: J
authors.lastname: Kletzmayr
authors.affiliation: Department of Surgery, Division of Transplant Surgery, University of Vienna, Austria.
authors.forename: Susanne
authors.initials: S
authors.lastname: Rasoul-Rockenschaub
authors.affiliation: Department of Medicine III, Division of Nephrology and Dialysis, University of Vienna, Austria.
authors.forename: Walter H
authors.initials: WH
authors.lastname: Hörl
authors.affiliation: Department of Medicine III, Division of Nephrology and Dialysis, University of Vienna, Austria.
authors.forename: Gere
authors.initials: G
authors.lastname: Sunder-Plassmann
mesh_terms: D000328:Adult; D000368:Aged; D000483:Alleles; D001483:Base Sequence / Q000235:genetics; D005260:Female; D005492:Folic Acid / Q000097:blood*; D005544:Forecasting; D005787:Gene Frequency; D005838:Genotype; D006710:Homocysteine / Q000097:blood*; D006801:Humans; D016030:Kidney Transplantation; D008297:Male; D042965:Methylenetetrahydrofolate Reductase (NADPH2); D008875:Middle Aged; D009994:Osmolar Concentration; D000587:Oxidoreductases Acting on CH-NH Group Donors / Q000235:genetics* / Q000502:physiology; D014805:Vitamin B 12 / Q000097:blood*
chemical_list: D006710:Homocysteine; D005492:Folic Acid; D000587:Oxidoreductases Acting on CH-NH Group Donors; D042965:Methylenetetrahydrofolate Reductase (NADPH2); D014805:Vitamin B 12