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The MTHFR C677T polymorphism contributes to an increased risk for vascular dementia: a meta-analysis
Hua Liu1, Min Yang, Guang-Ming Li
1Department of Neurology, Second Clinical Medical College of North Sichuan Medical College, Nanchong, Sichuan Province, China. hxliumedidoctor@163.com
Background/Aims:
Vascular dementia (VaD) is the second common cause of dementia after Alzheimer's disease (AD) in later life. The methylenetetrahydrofolate reductase (MTHFR) C677T polymorphism as a risk factor in VaD has been suggested, but direct evidence from genetic association studies remain inconclusive. We performed a meta-analysis pooling data from all relevant studies in order to determine the effect of the MTHFR C677T polymorphism on VaD.
Methods:
We applied a random-effects or fixed-effects model to combine odds ratio (OR) and 95% confidence intervals (95%CI). Q statistic was used to evaluate the homogeneity, and Egger's test and Funnel plot were used to assess publication bias.
Results:
A total of 11 studies, comprising 672 cases and 1038 controls, were included worldwide. Publication bias was not observed. This meta-analysis demonstrated that the MTHFR T allele or TT genotype had an increased risk for VaD in general populations (OR, 95%CI: 1.27, 1.01-1.59; 1.41, 1.06-1.88, respectively), and a significant association was found in allele contrast, recessive, and dominant model in Asian populations, but not in Caucasian populations.
Conclusion:
The MTHFR C677T polymorphism (mainly TT genotype) is associated with developing VaD in general populations or Asian populations.
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