Association of Methylenetetrahydrofolate Reductase C677T Gene Polymorphisms with Mild Cognitive Impairment Susceptibility: A Systematic Review and Meta-Analysis.

BACKGROUND

Methylenetetrahydrofolate reductase () C677T (rs1801133) gene polymorphisms are related to a growing risk of Alzheimer's disease; however, whether this association applies to mild cognitive impairment (MCI) remains unclear.

OBJECTIVE

We conducted this meta-analysis to evaluate the contribution of C677T (rs1801133) gene variants to the risk of MCI.

METHODS

PubMed, Embase, Web of Science, and China National Knowledge Infrastructure databases were searched from their inception to March 21, 2021, with language restricted to English or Chinese. We used fixed or random effects to examine the association between C677T (rs1801133) gene variants and MCI susceptibility. Forest plots of pooled odds ratios (ORs) and 95% confidence intervals (CIs) were generated.

RESULTS

Eight articles with 2,175 participants were included in the present meta-analysis. There was no significant association between C677T (rs1801133) gene variants and MCI susceptibility under the allelic (OR, 1.318; 95% CI, 0.964-1.801; = 0.084), dominant (OR, 1.296; 95% CI, 0.925-1.817; = 0.132), recessive (OR, 1.397; 95% CI, 0.845-2.312; = 0.193), heterozygous (OR, 1.031; 95% CI, 0.855-1.243; = 0.749), or homozygous (OR, 1.506; 95% CI, 0.850-2.667; = 0.160) models.

CONCLUSION

The results suggest that C677T (rs1801133) gene polymorphisms are not associated with MCI susceptibility. However, large-scale studies covering various factors are required.