PEMT and neural tube defect: An additional analysis of these pathways using haplotype and tagSNP screening approaches identified 68 SNPs associated with NTD risk in genes from the folate metabolic pathway, MTHFR and mitochondrial folate transporter (MFTC); DNA methylation, DNA (cytosine-5)-methyltransferase 3A (DNMT3A); B12 metabolism, Cubilin (CUBN) and choline metabolism, phosphatidylethanolamine N-methyltransferase (PEMT) (34).