Reduced folate carrier gene is a risk factor for neural tube defects in a Chinese population
Article first published online: 29 MAR 2005
Copyright © 2005 Wiley-Liss, Inc.
Birth Defects Research Part A: Clinical and Molecular Teratology
Volume 73, Issue 6, pages 430–433, June 2005
How to Cite
Pei, L., Zhu, H., Ren, A., Li, Z., Hao, L., Finnell, R. H. and Li, Z. (2005), Reduced folate carrier gene is a risk factor for neural tube defects in a Chinese population. Birth Defects Research Part A: Clinical and Molecular Teratology, 73: 430–433. doi: 10.1002/bdra.20130
- Issue published online: 2 JUN 2005
- Article first published online: 29 MAR 2005
- Manuscript Accepted: 20 DEC 2004
- Manuscript Received: 15 SEP 2004
- Special Funds for Major State Basic Research Project, China. Grant Number: G1999055905
- Key Technologies Research and Development Program, China. Grant Number: 2002BA709B11
- Environmental Protection Agency. Grant Number: RD-83068401
- reduced folate carrier gene (RFC1);
- neural tube defects;
- folic acid;
- folate transport;
- birth defects
There is a considerable body of data demonstrating that periconceptional supplementation of folic acid can prevent a significant proportion of neural tube defects (NTDs). At present, the mechanism by which folic acid exerts its beneficial effect remains unknown. Folate transporter genes, including the reduced folate carrier gene (RFC1), have been proposed as NTD risk factors.
The study population included 104 nuclear families with NTDs and 100 nonmalformed control families. We investigated the possible association between a common RFC1 polymorphism (A80G) and NTD risk among offspring, as well as potential gene-environment interactions between the infant RFC1 genotype and maternal periconceptional use of folic acid through a population-based case-control study.
We observed that the infants of the GG genotype were associated with a 2.56-fold increased risk of NTDs when compared to the AA genotype (odds ratio [OR], 2.56; 95% confidence interval [CI], 1.04–6.36) in our study population. Among mothers who did not utilize folic acid supplements, the risk for having a child with an NTD was 3.30 (95% CI, 1.15–9.65) for offspring with the GG genotype, compared to the reference (AA) genotype. Children who had the GG genotype and whose mothers did not take folic acid had an elevated risk for NTDs (OR, 8.80; 95% CI, 2.83–28.69), compared to offspring with the AA and GA genotypes whose mothers utilized folic acid supplements.
Our findings suggest that the RFC1 G allele is likely to be an important genetic factor in determining folate transport and subsequently may be a risk factor for NTDs in this Chinese population. Birth Defects Research (Part A), 2005. © 2005 Wiley-Liss, Inc.