The association between first trimester micronutrient intake, genotypes, and global DNA methylation in pregnant women


Our aim was to evaluate possible associations between consumption of micronutrients involved in one-carbon metabolism, MTHFR genotypes, and global DNA methylation in pregnant women.


A semi-quantitative dietary questionnaire was administered to 195 women during their first trimester in Morelos, Mexico. Two functional polymorphisms of the key folate-metabolizing gene, i.e. MTHFR 677 C>T and 1298 A>C, as well as global DNA methylation were assessed in peripheral blood drawn during the interview.


Independent of maternal age and caloric intake, vitamin B6 deficiency was associated with 1.8 fold increased risk of hypomethylation in women carrying the MTHFR 677 T allele.


There exists a subpopulation that is more susceptible to B vitamin deficiencies.