Maternal-fetal folate status and neural tube defects: a case control study.

The object of this study was to explore the role of folate in the pathophysiology of neural tube defects (NTD). Maternal and fetal serum and red blood cell folate were assayed in 14 cases of NTDs and compared with 14 controls with other malformations and matched for gestational age (range 18-36 weeks). In mothers of NTD fetuses, serum folate (5.2 ng/ml), red blood cell folate (294 ng/ml) and the folate methylation rate (65%) were significantly lower than in controls (6.6 and 399 ng/ml, respectively, and 77%). However, the fetal folate status was similar in cases and controls. In the NTD group, folate metabolism was altered in the mothers but not in the fetuses. Therefore, a normal folate placental transfer can be assumed in this group. In addition, it could be speculated that decreased maternal folate methylation might be involved in the pathogenesis of NTDs.