rs1001761

This case-control study of 616 conotruncal heart defect (CTD) case families and 1,645 control families identified 17 maternal and 17 fetal SNPs associated with CTD risk (BFDP ≤0.80). Key findings included 10 maternal SNPs in GCLC (rs572494 with BFDP=0.15), 4 fetal SNPs in TYMS (rs2612101, rs2847607, rs2847326, rs2847324), and evidence that maternal periconceptional folic acid supplementation modified SNP-CTD associations. The study evaluated 921 SNPs across 60 genes in folate, homocysteine, and transsulfuration pathways.

Case-control study (222 cases, 454 controls) examining gene-folate interactions in five folate-related genes (MTHFD1, MTHFR, SHMT1, DHFR, TYMS) and neural tube defect risk. Maternal MTHFR SNPs rs1476413, rs1801131, and rs1801133 showed decreased NTD risk with low folate intake (OR=0.55-0.69, 80% CI); infant MTHFD1 SNPs rs2236224, rs2236225, and rs11627387 showed increased risk (OR=1.53-4.25, 80% CI); maternal SHMT1 rs669340 showed protective gene-only effect (OR=0.69, 95% CI: 0.49-0.96).

This family-based association study examined 14 folate pathway genes using 89 SNPs in 445 NSCLP families (317 non-Hispanic White, 128 Hispanic) to identify genetic variants contributing to nonsyndromic cleft lip and palate. Evidence for association was found with SNPs in NOS3 and TYMS in the non-Hispanic White group (rs2373929/NOS3, rs502396/TYMS, and others), and with MTR, BHMT2, MTHFS, and SLC19A1 in the Hispanic group (rs1422086/BHMT2, rs2115540/MTHFS significant after Bonferroni correction). Multiple gene-gene interactions were detected, with CBS and MTHFD1 showing the most extensive interactions. Significant interactions were also found between several SNPs and maternal smoking and one SNP (rs651646/FOLR2) with offspring sex.