Polymorphism in methylenetetrahydrofolate reductase gene: its impact on plasma homocysteine levels and carotid atherosclerosis in ESRD patients receiving hemodialysis.

Abstract:

:The methylenetetrahydrofolate reductase (MTHFR) gene polymorphism has been shown to be associated with cardiovascular disease in healthy subjects as well as in patients with end-stage renal disease (ESRD). In this study, we examined the allelic frequency and genotype distribution of the MTHFR gene in 151 Chinese ESRD patients receiving hemodialysis and 135 healthy controls. In addition, we investigated the relationship between the MTHFR gene polymorphism and the plasma homocysteine (Hcy) level as well as the intima-media thickness of common carotid artery (CC-IMT) in these patients. The allelic frequency of the MTHFR gene with the C677T mutation in ESRD patients was 24.5% and that in healthy controls was 23%. Mean plasma Hcy level of the ESRD patients (23.1 +/- 7.4 micromol/l) was significantly higher than that of the controls (10.1 +/- 5.0 micromol/l), but did not correlate with vitamin B(6) and vitamin B(12) status. Moreover, the extent of hyperhomocysteinemia was genetically affected by the C677T mutation of the MTHFR gene. The plasma Hcy levels for the patients with the CC, CT and TT genotypes of the MTHFR gene were 22.3 +/- 6.8, 22.8 +/- 7.3, and 28.3 +/- 2.8 micromol/l, respectively. In addition, we found that the patients bearing the TT genotype had the highest CC-IMT (0.93 +/- 0.07 mm), whereas the lowest values (0.79 +/- 0.13 mm) were observed in those who had the CC genotype. One-way ANOVA showed that the CC-IMT in the patients with the TT genotype was significantly greater than that of the patients with the CC genotype (p < 0.05). Moreover, the mean CC-IMT of the patients carrying either TT or CT genotype of the MTHFR gene was significantly higher than that of the patients bearing the CC genotype (0.86 +/- 0.14 vs. 0.79 +/- 0.13 mm, p = 0.002). Multiple regression analysis, in which the change in CC-IMT was used as the dependent variables, identified age, smoking, the MTHFR genotype (CC = 0, CT = 1, TT = 2) and diabetes mellitus as the independent variables significantly associated with the increase of CC-IMT (p < 0.001). These risk factors jointly explained 43.9% of the CC-IMT variation and age explained most of the variation (R(2) = 0.34). We conclude that both the TT genotype and the T allele of the MTHFR gene are associated with the increase of CC-IMT in hemodialysis patients. The C677T mutation of the MTHFR gene may be an independent risk factor that predicts the development of carotid atherosclerosis in ESRD patients.

journal_name

Nephron

journal_title

Nephron

authors

Lim PS,Hung WR,Wei YH

doi

10.1159/000045922

subject

Has Abstract

pub_date

2001-03-01 00:00:00

pages

249-56

issue

3

eissn

1660-8151

issn

2235-3186

pii

45922

journal_volume

87

pub_type

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