Abstract
The 677 C → T polymorphism in the 5-10 methylenetetrahydrofolate reductase (MTHFR) gene has been associated with nonsyndromic cleft lip with or without cleft palate (CL/P) in some populations, but not others. Previous studies (ie, case–control and transmission disequilibrium tests (TDT)) in Brazilian families with CL/P have been unable to replicate this putative association. However, our group observed a lower proportion of CT heterozygotes among the mothers of CL/P probands, suggesting that the maternal genotype for this polymorphism might influence predisposition to CL/P. In order to further examine this issue, we performed a case–control study of the 677 C → T/MTHFR polymorphism in families with CL/P ascertained in two regions of Brazil: 172 from São Paulo (SP) and 252 from Ceará (CE). The control samples included 243 individuals from SP and 401 from CE. TDT was carried out in 102 patients with CL/P and their parents. No evidence of an association was observed between the 677 C → T/MTHFR polymorphism and CL/P using the case–control design, while borderline significance was obtained with the TDT (P=0.055). We have also looked for an interaction between maternal MTHFR genotypes and the propositi offspring's genotypes at two candidate susceptibility loci for CL/P, TGFA and BCL3. Interestingly, we observed an interaction between the maternal MTHFR and offspring's BCL3 genotypes (OR: 2.3; 95% CI: 1.1–4.8; P=0.03) but not with the offspring's TGFA genotypes. Therefore, our results reinforce the idea that the maternal MTHFR genotype plays a significant role in susceptibility to CL/P, but its teratogenic effect depends on the genotype of the offspring.
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Acknowledgements
We thank all of the patients and their relatives; Andréa Sertié for reading the manuscript; Carlos Maranduba for help on the analysis of the SNuPE; Constância G Urbani for secretarial help; Faculty of Dentistry at University of São Paulo, Association of Orofacial Clefts of Concórdia, Santa Catarina, and Hospital Albert Sabin, Ceará, Brazil for referring some patients. This work was supported by grants from FAPESP/CEPID, PRONEX, CNPq (except DFW). Part of this work was funded by a contract from the Massachusetts Center for Birth Defects Research and Prevention of the Massachusetts Department of Public Health (to DFW) and by an Etiology Grant of the Cleft Palate Foundation (to DFW).
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Gaspar, D., Matioli, S., Pavanello, R. et al. Maternal MTHFR interacts with the offspring's BCL3 genotypes, but not with TGFA, in increasing risk to nonsyndromic cleft lip with or without cleft palate. Eur J Hum Genet 12, 521–526 (2004). https://doi.org/10.1038/sj.ejhg.5201187
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DOI: https://doi.org/10.1038/sj.ejhg.5201187
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