Folate pathway and nonsyndromic cleft lip and palate

Wiley - Tập 91 Số 1 - Trang 50-60 - 2011
Susan H. Blanton1, Robin R. Henry2, Quiping Yuan2, John B. Mulliken3, Samuel Stal4, Richard H. Finnell5, Jacqueline T. Hecht2
1University of Miami
2University of Texas Health Science Center at Houston
3Harvard University
4Baylor college of Medicine;
5Texas A&M Institute of Biosciences and Technology, Houston, Texas

Tóm tắt

AbstractBACKGROUNDNonsyndromic cleft lip with or without cleft palate (NSCLP) is a common complex birth defect. Periconceptional supplementation with folic acid, a key component in DNA synthesis and cell division, has reduced the birth prevalence of neural tube defects and may similarly reduce the birth prevalence of other complex birth defects including NSCLP. Past studies investigating the role of two common methylenetetrahydrofolate reductase (MTHFR) single‐nucleotide polymorphisms (SNPs), C677T (rs1801133) and A1298C (rs1801131), in NSCLP have produced conflicting results. Most studies of folate pathway genes have been limited in scope, as few genes/SNPs have been interrogated. Here, we asked whether variations in a more comprehensive group of folate pathway genes were associated with NSCLP, and were there detectable interactions between these genes and environmental exposures? METHODS: Fourteen folate metabolism‐related genes were interrogated using 89 SNPs in multiplex and simplex non‐Hispanic white and Hispanic NSCLP families. RESULTS: Evidence for a risk association between NSCLP and SNPs in NOS3 and TYMS was detected in the non‐Hispanic white group, whereas associations with MTR, BHMT2, MTHFS, and SLC19A1 were detected in the Hispanic group. Evidence for over‐transmission of haplotypes and gene interactions in the methionine arm was detected.CONCLUSIONSThese results suggest that perturbations of the genes in the folate pathway may contribute to NSCLP. There was evidence for an interaction between several SNPs and maternal smoking, and for one SNP with gender of the offspring. These results provide support for other studies that suggest that high maternal homocysteine levels may contribute to NSCLP and should be further investigated. Birth Defects Research (Part A), 2011. © 2010 Wiley‐Liss, Inc.

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Wiley

Tập 91 Số 1

50-60

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