Furthermore, the result of the meta-analysis supported the association between MTRR 66A>G and NTDs risk (G allele vs. A allele: OR = 1.32, 95% CI = 1.09-1.61, GG + GA vs. AA: OR = 1.49, 95% CI = 1.06-2.09, GG vs. AA: OR = 1.61, 95% CI = 1.04-2.49).Our study confirmed that the MTRR 66A>G and MTR 2756A>G were significantly associated with the increased NTDs risk in a Chinese population.
The present meta-analysis indicated that MTRR A66G polymorphism, but not MTR A2756G, is significantly associated with maternal risk for NTDs in Caucasians.
Interaction between maternal 5,10-methylenetetrahydrofolate reductase C677T and methionine synthase A2756G gene variants to increase the risk of fetal neural tube defects in a Shanxi Han population.
No significant NTD association was found with S175L or K350R in cases or their parents and no interactions were observed between these polymorphisms and the D919G variant of MTR or the A222V variant of 5,10-methylenetetrahydrofolate reductase (MTHFR).